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Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped Classes</font></a> + | <a href="functions.html"> +<font color="#004faf">Functions</font></a> +</td> +<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QHttp Class Reference<br><small>[<a href="network.html">network module</a>]</small></h1> + +<p>The QHttp class provides an implementation of the HTTP protocol. +<a href="#details">More...</a> +<p><tt>#include <<a href="qhttp-h.html">qhttp.h</a>></tt> +<p>Inherits <a href="qnetworkprotocol.html">QNetworkProtocol</a>. +<p><a href="qhttp-members.html">List of all member functions.</a> +<h2>Public Members</h2> +<ul> +<li class=fn><a href="#QHttp"><b>QHttp</b></a> ()</li> +<li class=fn><a href="#QHttp-2"><b>QHttp</b></a> ( QObject * parent, const char * name = 0 )</li> +<li class=fn><a href="#QHttp-3"><b>QHttp</b></a> ( const QString & hostname, Q_UINT16 port = 80, QObject * parent = 0, const char * name = 0 )</li> +<li class=fn>virtual <a href="#~QHttp"><b>~QHttp</b></a> ()</li> +<li class=fn>enum <a href="#State-enum"><b>State</b></a> { Unconnected, HostLookup, Connecting, Sending, Reading, Connected, Closing }</li> +<li class=fn>enum <a href="#Error-enum"><b>Error</b></a> { NoError, UnknownError, HostNotFound, ConnectionRefused, UnexpectedClose, InvalidResponseHeader, WrongContentLength, Aborted }</li> +<li class=fn>int <a href="#setHost"><b>setHost</b></a> ( const QString & hostname, Q_UINT16 port = 80 )</li> +<li class=fn>int <a href="#get"><b>get</b></a> ( const QString & path, QIODevice * to = 0 )</li> +<li class=fn>int <a href="#post"><b>post</b></a> ( const QString & path, QIODevice * data, QIODevice * to = 0 )</li> +<li class=fn>int <a href="#post-2"><b>post</b></a> ( const QString & path, const QByteArray & data, QIODevice * to = 0 )</li> +<li class=fn>int <a href="#head"><b>head</b></a> ( const QString & path )</li> +<li class=fn>int <a href="#request"><b>request</b></a> ( const QHttpRequestHeader & header, QIODevice * data = 0, QIODevice * to = 0 )</li> +<li class=fn>int <a href="#request-2"><b>request</b></a> ( const QHttpRequestHeader & header, const QByteArray & data, QIODevice * to = 0 )</li> +<li class=fn>int <a href="#closeConnection"><b>closeConnection</b></a> ()</li> +<li class=fn>Q_ULONG <a href="#bytesAvailable"><b>bytesAvailable</b></a> () const</li> +<li class=fn>Q_LONG <a href="#readBlock"><b>readBlock</b></a> ( char * data, Q_ULONG maxlen )</li> +<li class=fn>QByteArray <a href="#readAll"><b>readAll</b></a> ()</li> +<li class=fn>int <a href="#currentId"><b>currentId</b></a> () const</li> +<li class=fn>QIODevice * <a href="#currentSourceDevice"><b>currentSourceDevice</b></a> () const</li> +<li class=fn>QIODevice * <a href="#currentDestinationDevice"><b>currentDestinationDevice</b></a> () const</li> +<li class=fn>QHttpRequestHeader <a href="#currentRequest"><b>currentRequest</b></a> () const</li> +<li class=fn>bool <a href="#hasPendingRequests"><b>hasPendingRequests</b></a> () const</li> +<li class=fn>void <a href="#clearPendingRequests"><b>clearPendingRequests</b></a> ()</li> +<li class=fn>State <a href="#state"><b>state</b></a> () const</li> +<li class=fn>Error <a href="#error"><b>error</b></a> () const</li> +<li class=fn>QString <a href="#errorString"><b>errorString</b></a> () const</li> +</ul> +<h2>Public Slots</h2> +<ul> +<li class=fn>void <a href="#abort"><b>abort</b></a> ()</li> +</ul> +<h2>Signals</h2> +<ul> +<li class=fn>void <a href="#stateChanged"><b>stateChanged</b></a> ( int state )</li> +<li class=fn>void <a href="#responseHeaderReceived"><b>responseHeaderReceived</b></a> ( const QHttpResponseHeader & resp )</li> +<li class=fn>void <a href="#readyRead"><b>readyRead</b></a> ( const QHttpResponseHeader & resp )</li> +<li class=fn>void <a href="#dataSendProgress"><b>dataSendProgress</b></a> ( int done, int total )</li> +<li class=fn>void <a href="#dataReadProgress"><b>dataReadProgress</b></a> ( int done, int total )</li> +<li class=fn>void <a href="#requestStarted"><b>requestStarted</b></a> ( int id )</li> +<li class=fn>void <a href="#requestFinished"><b>requestFinished</b></a> ( int id, bool error )</li> +<li class=fn>void <a href="#done"><b>done</b></a> ( bool error )</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + +The QHttp class provides an implementation of the HTTP protocol. + +<p> + +<p> This class provides two different interfaces: one is the +<a href="qnetworkprotocol.html">QNetworkProtocol</a> interface that allows you to use HTTP through the +<a href="qurloperator.html">QUrlOperator</a> abstraction. The other is a direct interface to HTTP +that allows you to have more control over the requests and that +allows you to access the response header fields. +<p> Don't mix the two interfaces, since the behavior is not +well-defined. +<p> If you want to use QHttp with the QNetworkProtocol interface, you +do not use it directly, but rather through a QUrlOperator, for +example: +<p> <pre> + <a href="qurloperator.html">QUrlOperator</a> op( "http://www.trolltech.com" ); + op.<a href="qurloperator.html#get">get</a>( "index.html" ); + </pre> + +<p> This code will only work if the QHttp class is registered; to +register the class, you must call <a href="qurloperator.html#qInitNetworkProtocols">qInitNetworkProtocols</a>() before +using a QUrlOperator with HTTP. +<p> The QNetworkProtocol interface for HTTP only supports the +operations <a href="qnetworkprotocol.html#operationGet">operationGet</a>() and <a href="qnetworkprotocol.html#operationPut">operationPut</a>(), i.e. +<a href="qurloperator.html#get">QUrlOperator::get</a>() and <a href="qurloperator.html#put">QUrlOperator::put</a>(), if you use it with a +<a href="qurloperator.html">QUrlOperator</a>. +<p> The rest of this descrption describes the direct interface to +HTTP. +<p> The class works asynchronously, so there are no blocking +functions. If an operation cannot be executed immediately, the +function will still return straight away and the operation will be +scheduled for later execution. The results of scheduled operations +are reported via signals. This approach depends on the event loop +being in operation. +<p> The operations that can be scheduled (they are called "requests" +in the rest of the documentation) are the following: <a href="#setHost">setHost</a>(), +<a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#head">head</a>() and <a href="#request">request</a>(). +<p> All of these requests return a unique identifier that allows you +to keep track of the request that is currently executed. When the +execution of a request starts, the <a href="#requestStarted">requestStarted</a>() signal with +the identifier is emitted and when the request is finished, the +<a href="#requestFinished">requestFinished</a>() signal is emitted with the identifier and a bool +that indicates if the request finished with an error. +<p> To make an HTTP request you must set up suitable HTTP headers. The +following example demonstrates, how to request the main HTML page +from the Trolltech home page (i.e. the URL +http://www.trolltech.com/index.html): +<p> <pre> + <a href="qhttprequestheader.html">QHttpRequestHeader</a> header( "GET", "/index.html" ); + header.<a href="qhttpheader.html#setValue">setValue</a>( "Host", "www.trolltech.com" ); + http->setHost( "www.trolltech.com" ); + http->request( header ); + </pre> + +<p> For the common HTTP requests <tt>GET</tt>, <tt>POST</tt> and <tt>HEAD</tt>, QHttp +provides the convenience functions <a href="#get">get</a>(), <a href="#post">post</a>() and <a href="#head">head</a>(). They +already use a reasonable header and if you don't have to set +special header fields, they are easier to use. The above example +can also be written as: +<p> <pre> + http->setHost( "www.trolltech.com" ); // id == 1 + http->get( "/index.html" ); // id == 2 + </pre> + +<p> For this example the following sequence of signals is emitted +(with small variations, depending on network traffic, etc.): +<p> <pre> + <a href="#requestStarted">requestStarted</a>( 1 ) + <a href="#requestFinished">requestFinished</a>( 1, FALSE ) + + <a href="#requestStarted">requestStarted</a>( 2 ) + <a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Connecting</a> ) + <a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Sending</a> ) + <a href="#dataSendProgress">dataSendProgress</a>( 77, 77 ) + <a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Reading</a> ) + <a href="#responseHeaderReceived">responseHeaderReceived</a>( responseheader ) + <a href="#dataReadProgress">dataReadProgress</a>( 5388, 0 ) + <a href="#readyRead">readyRead</a>( responseheader ) + <a href="#dataReadProgress">dataReadProgress</a>( 18300, 0 ) + <a href="#readyRead">readyRead</a>( responseheader ) + <a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Connected</a> ) + <a href="#requestFinished">requestFinished</a>( 2, FALSE ) + + <a href="#done">done</a>( FALSE ) + + <a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Closing</a> ) + <a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Unconnected</a> ) + </pre> + +<p> The <a href="#dataSendProgress">dataSendProgress</a>() and <a href="#dataReadProgress">dataReadProgress</a>() signals in the above +example are useful if you want to show a <a href="qprogressbar.html">progressbar</a> to inform the user about the progress of the +download. The second argument is the total size of data. In +certain cases it is not possible to know the total amount in +advance, in which case the second argument is 0. (If you connect +to a <a href="qprogressbar.html">QProgressBar</a> a total of 0 results in a busy indicator.) +<p> When the response header is read, it is reported with the +<a href="#responseHeaderReceived">responseHeaderReceived</a>() signal. +<p> The <a href="#readyRead">readyRead</a>() signal tells you that there is data ready to be +read. The amount of data can then be queried with the +<a href="#bytesAvailable">bytesAvailable</a>() function and it can be read with the <a href="#readBlock">readBlock</a>() +or <a href="#readAll">readAll</a>() functions. +<p> If an error occurs during the execution of one of the commands in +a sequence of commands, all the pending commands (i.e. scheduled, +but not yet executed commands) are cleared and no signals are +emitted for them. +<p> For example, if you have the following sequence of reqeusts +<p> <pre> + http->setHost( "www.foo.bar" ); // id == 1 + http->get( "/index.html" ); // id == 2 + http->post( "register.html", data ); // id == 3 + </pre> + +<p> and the <a href="#get">get</a>() request fails because the host lookup fails, then +the <a href="#post">post</a>() request is never executed and the signals would look +like this: +<p> <pre> + <a href="#requestStarted">requestStarted</a>( 1 ) + <a href="#requestFinished">requestFinished</a>( 1, FALSE ) + + <a href="#requestStarted">requestStarted</a>( 2 ) + <a href="#stateChanged">stateChanged</a>( <a href="#State-enum">HostLookup</a> ) + <a href="#requestFinished">requestFinished</a>( 2, TRUE ) + + <a href="#done">done</a>( TRUE ) + + <a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Unconnected</a> ) + </pre> + +<p> You can then get details about the error with the <a href="#error">error</a>() and +<a href="#errorString">errorString</a>() functions. Note that only unexpected behaviour, like +network failure is considered as an error. If the server response +contains an error status, like a 404 response, this is reported as +a normal response case. So you should always check the <a href="qhttpresponseheader.html#statusCode">status code</a> of the +response header. +<p> The functions <a href="#currentId">currentId</a>() and <a href="#currentRequest">currentRequest</a>() provide more +information about the currently executing request. +<p> The functions <a href="#hasPendingRequests">hasPendingRequests</a>() and <a href="#clearPendingRequests">clearPendingRequests</a>() +allow you to query and clear the list of pending requests. +<p> <p>See also <a href="network.html">Qt Network Documentation</a>, <a href="qnetworkprotocol.html">QNetworkProtocol</a>, <a href="qurloperator.html">QUrlOperator</a>, <a href="qftp.html">QFtp</a>, and <a href="io.html">Input/Output and Networking</a>. + +<hr><h2>Member Type Documentation</h2> +<h3 class=fn><a name="Error-enum"></a>QHttp::Error</h3> +<p> This enum identifies the error that occurred. +<ul> +<li><tt>QHttp::NoError</tt> - No error occurred. +<li><tt>QHttp::HostNotFound</tt> - The host name lookup failed. +<li><tt>QHttp::ConnectionRefused</tt> - The server refused the connection. +<li><tt>QHttp::UnexpectedClose</tt> - The server closed the connection unexpectedly. +<li><tt>QHttp::InvalidResponseHeader</tt> - The server sent an invalid response header. +<li><tt>QHttp::WrongContentLength</tt> - The client could not read the content correctly +because an error with respect to the content length occurred. +<li><tt>QHttp::Aborted</tt> - The request was aborted with <a href="#abort">abort</a>(). +<li><tt>QHttp::UnknownError</tt> - An error other than those specified above +occurred. +</ul><p> <p>See also <a href="#error">error</a>(). + +<h3 class=fn><a name="State-enum"></a>QHttp::State</h3> + +<p> This enum is used to specify the state the client is in: +<ul> +<li><tt>QHttp::Unconnected</tt> - There is no connection to the host. +<li><tt>QHttp::HostLookup</tt> - A host name lookup is in progress. +<li><tt>QHttp::Connecting</tt> - An attempt to connect to the host is in progress. +<li><tt>QHttp::Sending</tt> - The client is sending its request to the server. +<li><tt>QHttp::Reading</tt> - The client's request has been sent and the client +is reading the server's response. +<li><tt>QHttp::Connected</tt> - The connection to the host is open, but the client is +neither sending a request, nor waiting for a response. +<li><tt>QHttp::Closing</tt> - The connection is closing down, but is not yet +closed. (The state will be <a href="#State-enum">Unconnected</a> when the connection is +closed.) +</ul><p> <p>See also <a href="#stateChanged">stateChanged</a>() and <a href="#state">state</a>(). + +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="QHttp"></a>QHttp::QHttp () +</h3> +Constructs a QHttp object. + +<h3 class=fn><a name="QHttp-2"></a>QHttp::QHttp ( <a href="qobject.html">QObject</a> * parent, const char * name = 0 ) +</h3> +Constructs a QHttp object. The parameters <em>parent</em> and <em>name</em> +are passed on to the <a href="qobject.html">QObject</a> constructor. + +<h3 class=fn><a name="QHttp-3"></a>QHttp::QHttp ( const <a href="qstring.html">QString</a> & hostname, Q_UINT16 port = 80, <a href="qobject.html">QObject</a> * parent = 0, const char * name = 0 ) +</h3> +Constructs a QHttp object. Subsequent requests are done by +connecting to the server <em>hostname</em> on port <em>port</em>. The +parameters <em>parent</em> and <em>name</em> are passed on to the <a href="qobject.html">QObject</a> +constructor. +<p> <p>See also <a href="#setHost">setHost</a>(). + +<h3 class=fn><a name="~QHttp"></a>QHttp::~QHttp ()<tt> [virtual]</tt> +</h3> +Destroys the QHttp object. If there is an open connection, it is +closed. + +<h3 class=fn>void <a name="abort"></a>QHttp::abort ()<tt> [slot]</tt> +</h3> +Aborts the current request and deletes all scheduled requests. +<p> For the current request, the <a href="#requestFinished">requestFinished</a>() signal with the <tt>error</tt> argument <tt>TRUE</tt> is emitted. For all other requests that are +affected by the <a href="#abort">abort</a>(), no signals are emitted. +<p> Since this slot also deletes the scheduled requests, there are no +requests left and the <a href="#done">done</a>() signal is emitted (with the <tt>error</tt> +argument <tt>TRUE</tt>). +<p> <p>See also <a href="#clearPendingRequests">clearPendingRequests</a>(). + +<h3 class=fn>Q_ULONG <a name="bytesAvailable"></a>QHttp::bytesAvailable () const +</h3> +Returns the number of bytes that can be read from the response +content at the moment. +<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), <a href="#readyRead">readyRead</a>(), <a href="#readBlock">readBlock</a>(), and <a href="#readAll">readAll</a>(). + +<h3 class=fn>void <a name="clearPendingRequests"></a>QHttp::clearPendingRequests () +</h3> +Deletes all pending requests from the list of scheduled requests. +This does not affect the request that is being executed. If +you want to stop this this as well, use <a href="#abort">abort</a>(). +<p> <p>See also <a href="#hasPendingRequests">hasPendingRequests</a>() and <a href="#abort">abort</a>(). + +<h3 class=fn>int <a name="closeConnection"></a>QHttp::closeConnection () +</h3> +Closes the connection; this is useful if you have a keep-alive +connection and want to close it. +<p> For the requests issued with <a href="#get">get</a>(), <a href="#post">post</a>() and <a href="#head">head</a>(), QHttp sets +the connection to be keep-alive. You can also do this using the +header you pass to the <a href="#request">request</a>() function. QHttp only closes the +connection to the HTTP server if the response header requires it +to do so. +<p> The function does not block and returns immediately. The request +is scheduled, and its execution is performed asynchronously. The +function returns a unique identifier which is passed by +<a href="#requestStarted">requestStarted</a>() and <a href="#requestFinished">requestFinished</a>(). +<p> When the request is started the requestStarted() signal is +emitted. When it is finished the requestFinished() signal is +emitted. +<p> If you want to close the connection immediately, you have to use +<a href="#abort">abort</a>() instead. +<p> <p>See also <a href="#stateChanged">stateChanged</a>(), <a href="#abort">abort</a>(), <a href="#requestStarted">requestStarted</a>(), <a href="#requestFinished">requestFinished</a>(), and <a href="#done">done</a>(). + +<h3 class=fn><a href="qiodevice.html">QIODevice</a> * <a name="currentDestinationDevice"></a>QHttp::currentDestinationDevice () const +</h3> +Returns the <a href="qiodevice.html">QIODevice</a> pointer that is used as to store the data of the HTTP +request being executed. If there is no current request or if the request +does not store the data to an IO device, this function returns 0. +<p> This function can be used to delete the QIODevice in the slot connected to +the <a href="#requestFinished">requestFinished</a>() signal. +<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), and <a href="#request">request</a>(). + +<h3 class=fn>int <a name="currentId"></a>QHttp::currentId () const +</h3> +Returns the identifier of the HTTP request being executed or 0 if +there is no request being executed (i.e. they've all finished). +<p> <p>See also <a href="#currentRequest">currentRequest</a>(). + +<h3 class=fn><a href="qhttprequestheader.html">QHttpRequestHeader</a> <a name="currentRequest"></a>QHttp::currentRequest () const +</h3> +Returns the request header of the HTTP request being executed. If +the request is one issued by <a href="#setHost">setHost</a>() or <a href="#closeConnection">closeConnection</a>(), it +returns an invalid request header, i.e. +<a href="qhttpheader.html#isValid">QHttpRequestHeader::isValid</a>() returns FALSE. +<p> <p>See also <a href="#currentId">currentId</a>(). + +<h3 class=fn><a href="qiodevice.html">QIODevice</a> * <a name="currentSourceDevice"></a>QHttp::currentSourceDevice () const +</h3> +Returns the <a href="qiodevice.html">QIODevice</a> pointer that is used as the data source of the HTTP +request being executed. If there is no current request or if the request +does not use an IO device as the data source, this function returns 0. +<p> This function can be used to delete the QIODevice in the slot connected to +the <a href="#requestFinished">requestFinished</a>() signal. +<p> <p>See also <a href="#currentDestinationDevice">currentDestinationDevice</a>(), <a href="#post">post</a>(), and <a href="#request">request</a>(). + +<h3 class=fn>void <a name="dataReadProgress"></a>QHttp::dataReadProgress ( int done, int total )<tt> [signal]</tt> +</h3> + +<p> This signal is emitted when this object reads data from a HTTP +server to indicate the current progress of the download. +<p> <em>done</em> is the amount of data that has already arrived and <em>total</em> is the total amount of data. It is possible that the total +amount of data that should be transferred cannot be determined, in +which case <em>total</em> is 0.(If you connect to a <a href="qprogressbar.html">QProgressBar</a>, the +progress bar shows a busy indicator if the total is 0). +<p> <b>Warning:</b> <em>done</em> and <em>total</em> are not necessarily the size in +bytes, since for large files these values might need to be +"scaled" to avoid overflow. +<p> <p>See also <a href="#dataSendProgress">dataSendProgress</a>(), <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), and <a href="qprogressbar.html#progress-prop">QProgressBar::progress</a>. + +<h3 class=fn>void <a name="dataSendProgress"></a>QHttp::dataSendProgress ( int done, int total )<tt> [signal]</tt> +</h3> + +<p> This signal is emitted when this object sends data to a HTTP +server to inform it about the progress of the upload. +<p> <em>done</em> is the amount of data that has already arrived and <em>total</em> is the total amount of data. It is possible that the total +amount of data that should be transferred cannot be determined, in +which case <em>total</em> is 0.(If you connect to a <a href="qprogressbar.html">QProgressBar</a>, the +progress bar shows a busy indicator if the total is 0). +<p> <b>Warning:</b> <em>done</em> and <em>total</em> are not necessarily the size in +bytes, since for large files these values might need to be +"scaled" to avoid overflow. +<p> <p>See also <a href="#dataReadProgress">dataReadProgress</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), and <a href="qprogressbar.html#progress-prop">QProgressBar::progress</a>. + +<h3 class=fn>void <a name="done"></a>QHttp::done ( bool error )<tt> [signal]</tt> +</h3> + +<p> This signal is emitted when the last pending request has finished; +(it is emitted after the last request's <a href="#requestFinished">requestFinished</a>() signal). +<em>error</em> is TRUE if an error occurred during the processing; +otherwise <em>error</em> is FALSE. +<p> <p>See also <a href="#requestFinished">requestFinished</a>(), <a href="#error">error</a>(), and <a href="#errorString">errorString</a>(). + +<h3 class=fn><a href="qhttp.html#Error-enum">Error</a> <a name="error"></a>QHttp::error () const +</h3> +Returns the last error that occurred. This is useful to find out +what happened when receiving a <a href="#requestFinished">requestFinished</a>() or a <a href="#done">done</a>() +signal with the <tt>error</tt> argument <tt>TRUE</tt>. +<p> If you start a new request, the error status is reset to <a href="#Error-enum">NoError</a>. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="errorString"></a>QHttp::errorString () const +</h3> +Returns a human-readable description of the last error that +occurred. This is useful to present a error message to the user +when receiving a <a href="#requestFinished">requestFinished</a>() or a <a href="#done">done</a>() signal with the <tt>error</tt> argument <tt>TRUE</tt>. + +<h3 class=fn>int <a name="get"></a>QHttp::get ( const <a href="qstring.html">QString</a> & path, <a href="qiodevice.html">QIODevice</a> * to = 0 ) +</h3> +Sends a get request for <em>path</em> to the server set by <a href="#setHost">setHost</a>() or +as specified in the constructor. +<p> <em>path</em> must be an absolute path like <tt>/index.html</tt> or an +absolute URI like <a href="http://www.trolltech.com/index.html">http://www.trolltech.com/index.html</a>. +<p> If the IO device <em>to</em> is 0 the <a href="#readyRead">readyRead</a>() signal is emitted +every time new content data is available to read. +<p> If the IO device <em>to</em> is not 0, the content data of the response +is written directly to the device. Make sure that the <em>to</em> +pointer is valid for the duration of the operation (it is safe to +delete it when the <a href="#requestFinished">requestFinished</a>() signal is emitted). +<p> The function does not block and returns immediately. The request +is scheduled, and its execution is performed asynchronously. The +function returns a unique identifier which is passed by +<a href="#requestStarted">requestStarted</a>() and requestFinished(). +<p> When the request is started the requestStarted() signal is +emitted. When it is finished the requestFinished() signal is +emitted. +<p> <p>See also <a href="#setHost">setHost</a>(), <a href="#post">post</a>(), <a href="#head">head</a>(), <a href="#request">request</a>(), <a href="#requestStarted">requestStarted</a>(), <a href="#requestFinished">requestFinished</a>(), and <a href="#done">done</a>(). + +<h3 class=fn>bool <a name="hasPendingRequests"></a>QHttp::hasPendingRequests () const +</h3> +Returns TRUE if there are any requests scheduled that have not yet +been executed; otherwise returns FALSE. +<p> The request that is being executed is <em>not</em> considered as a +scheduled request. +<p> <p>See also <a href="#clearPendingRequests">clearPendingRequests</a>(), <a href="#currentId">currentId</a>(), and <a href="#currentRequest">currentRequest</a>(). + +<h3 class=fn>int <a name="head"></a>QHttp::head ( const <a href="qstring.html">QString</a> & path ) +</h3> +Sends a header request for <em>path</em> to the server set by <a href="#setHost">setHost</a>() +or as specified in the constructor. +<p> <em>path</em> must be an absolute path like <tt>/index.html</tt> or an +absolute URI like <a href="http://www.trolltech.com/index.html">http://www.trolltech.com/index.html</a>. +<p> The function does not block and returns immediately. The request +is scheduled, and its execution is performed asynchronously. The +function returns a unique identifier which is passed by +<a href="#requestStarted">requestStarted</a>() and <a href="#requestFinished">requestFinished</a>(). +<p> When the request is started the requestStarted() signal is +emitted. When it is finished the requestFinished() signal is +emitted. +<p> <p>See also <a href="#setHost">setHost</a>(), <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), <a href="#requestStarted">requestStarted</a>(), <a href="#requestFinished">requestFinished</a>(), and <a href="#done">done</a>(). + +<h3 class=fn>int <a name="post"></a>QHttp::post ( const <a href="qstring.html">QString</a> & path, <a href="qiodevice.html">QIODevice</a> * data, <a href="qiodevice.html">QIODevice</a> * to = 0 ) +</h3> +Sends a post request for <em>path</em> to the server set by <a href="#setHost">setHost</a>() or +as specified in the constructor. +<p> <em>path</em> must be an absolute path like <tt>/index.html</tt> or an +absolute URI like <a href="http://www.trolltech.com/index.html">http://www.trolltech.com/index.html</a>. +<p> The incoming data comes via the <em>data</em> IO device. +<p> If the IO device <em>to</em> is 0 the <a href="#readyRead">readyRead</a>() signal is emitted +every time new content data is available to read. +<p> If the IO device <em>to</em> is not 0, the content data of the response +is written directly to the device. Make sure that the <em>to</em> +pointer is valid for the duration of the operation (it is safe to +delete it when the <a href="#requestFinished">requestFinished</a>() signal is emitted). +<p> The function does not block and returns immediately. The request +is scheduled, and its execution is performed asynchronously. The +function returns a unique identifier which is passed by +<a href="#requestStarted">requestStarted</a>() and requestFinished(). +<p> When the request is started the requestStarted() signal is +emitted. When it is finished the requestFinished() signal is +emitted. +<p> <p>See also <a href="#setHost">setHost</a>(), <a href="#get">get</a>(), <a href="#head">head</a>(), <a href="#request">request</a>(), <a href="#requestStarted">requestStarted</a>(), <a href="#requestFinished">requestFinished</a>(), and <a href="#done">done</a>(). + +<h3 class=fn>int <a name="post-2"></a>QHttp::post ( const <a href="qstring.html">QString</a> & path, const <a href="qbytearray.html">QByteArray</a> & data, <a href="qiodevice.html">QIODevice</a> * to = 0 ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <em>data</em> is used as the content data of the HTTP request. + +<h3 class=fn><a href="qbytearray.html">QByteArray</a> <a name="readAll"></a>QHttp::readAll () +</h3> +Reads all the bytes from the response content and returns them. +<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), <a href="#readyRead">readyRead</a>(), <a href="#bytesAvailable">bytesAvailable</a>(), and <a href="#readBlock">readBlock</a>(). + +<h3 class=fn>Q_LONG <a name="readBlock"></a>QHttp::readBlock ( char * data, Q_ULONG maxlen ) +</h3> +Reads <em>maxlen</em> bytes from the response content into <em>data</em> and +returns the number of bytes read. Returns -1 if an error occurred. +<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), <a href="#readyRead">readyRead</a>(), <a href="#bytesAvailable">bytesAvailable</a>(), and <a href="#readAll">readAll</a>(). + +<h3 class=fn>void <a name="readyRead"></a>QHttp::readyRead ( const <a href="qhttpresponseheader.html">QHttpResponseHeader</a> & resp )<tt> [signal]</tt> +</h3> + +<p> This signal is emitted when there is new response data to read. +<p> If you specified a device in the request where the data should be +written to, then this signal is <em>not</em> emitted; instead the data +is written directly to the device. +<p> The response header is passed in <em>resp</em>. +<p> You can read the data with the <a href="#readAll">readAll</a>() or <a href="#readBlock">readBlock</a>() functions +<p> This signal is useful if you want to process the data in chunks as +soon as it becomes available. If you are only interested in the +complete data, just connect to the <a href="#requestFinished">requestFinished</a>() signal and +read the data then instead. +<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), <a href="#readAll">readAll</a>(), <a href="#readBlock">readBlock</a>(), and <a href="#bytesAvailable">bytesAvailable</a>(). + +<h3 class=fn>int <a name="request"></a>QHttp::request ( const <a href="qhttprequestheader.html">QHttpRequestHeader</a> & header, <a href="qiodevice.html">QIODevice</a> * data = 0, <a href="qiodevice.html">QIODevice</a> * to = 0 ) +</h3> +Sends a request to the server set by <a href="#setHost">setHost</a>() or as specified in +the constructor. Uses the <em>header</em> as the HTTP request header. +You are responsible for setting up a header that is appropriate +for your request. +<p> The incoming data comes via the <em>data</em> IO device. +<p> If the IO device <em>to</em> is 0 the <a href="#readyRead">readyRead</a>() signal is emitted +every time new content data is available to read. +<p> If the IO device <em>to</em> is not 0, the content data of the response +is written directly to the device. Make sure that the <em>to</em> +pointer is valid for the duration of the operation (it is safe to +delete it when the <a href="#requestFinished">requestFinished</a>() signal is emitted). +<p> The function does not block and returns immediately. The request +is scheduled, and its execution is performed asynchronously. The +function returns a unique identifier which is passed by +<a href="#requestStarted">requestStarted</a>() and requestFinished(). +<p> When the request is started the requestStarted() signal is +emitted. When it is finished the requestFinished() signal is +emitted. +<p> <p>See also <a href="#setHost">setHost</a>(), <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#head">head</a>(), <a href="#requestStarted">requestStarted</a>(), <a href="#requestFinished">requestFinished</a>(), and <a href="#done">done</a>(). + +<h3 class=fn>int <a name="request-2"></a>QHttp::request ( const <a href="qhttprequestheader.html">QHttpRequestHeader</a> & header, const <a href="qbytearray.html">QByteArray</a> & data, <a href="qiodevice.html">QIODevice</a> * to = 0 ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <em>data</em> is used as the content data of the HTTP request. + +<h3 class=fn>void <a name="requestFinished"></a>QHttp::requestFinished ( int id, bool error )<tt> [signal]</tt> +</h3> + +<p> This signal is emitted when processing the request identified by +<em>id</em> has finished. <em>error</em> is TRUE if an error occurred during +the processing; otherwise <em>error</em> is FALSE. +<p> <p>See also <a href="#requestStarted">requestStarted</a>(), <a href="#done">done</a>(), <a href="#error">error</a>(), and <a href="#errorString">errorString</a>(). + +<h3 class=fn>void <a name="requestStarted"></a>QHttp::requestStarted ( int id )<tt> [signal]</tt> +</h3> + +<p> This signal is emitted when processing the request identified by +<em>id</em> starts. +<p> <p>See also <a href="#requestFinished">requestFinished</a>() and <a href="#done">done</a>(). + +<h3 class=fn>void <a name="responseHeaderReceived"></a>QHttp::responseHeaderReceived ( const <a href="qhttpresponseheader.html">QHttpResponseHeader</a> & resp )<tt> [signal]</tt> +</h3> + +<p> This signal is emitted when the HTTP header of a server response +is available. The header is passed in <em>resp</em>. +<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#head">head</a>(), <a href="#request">request</a>(), and <a href="#readyRead">readyRead</a>(). + +<h3 class=fn>int <a name="setHost"></a>QHttp::setHost ( const <a href="qstring.html">QString</a> & hostname, Q_UINT16 port = 80 ) +</h3> +Sets the HTTP server that is used for requests to <em>hostname</em> on +port <em>port</em>. +<p> The function does not block and returns immediately. The request +is scheduled, and its execution is performed asynchronously. The +function returns a unique identifier which is passed by +<a href="#requestStarted">requestStarted</a>() and <a href="#requestFinished">requestFinished</a>(). +<p> When the request is started the requestStarted() signal is +emitted. When it is finished the requestFinished() signal is +emitted. +<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#head">head</a>(), <a href="#request">request</a>(), <a href="#requestStarted">requestStarted</a>(), <a href="#requestFinished">requestFinished</a>(), and <a href="#done">done</a>(). + +<h3 class=fn><a href="qhttp.html#State-enum">State</a> <a name="state"></a>QHttp::state () const +</h3> +Returns the current state of the object. When the state changes, +the <a href="#stateChanged">stateChanged</a>() signal is emitted. +<p> <p>See also <a href="#State-enum">State</a> and <a href="#stateChanged">stateChanged</a>(). + +<h3 class=fn>void <a name="stateChanged"></a>QHttp::stateChanged ( int state )<tt> [signal]</tt> +</h3> + +<p> This signal is emitted when the state of the QHttp object changes. +The argument <em>state</em> is the new state of the connection; it is +one of the <a href="#State-enum">State</a> values. +<p> This usually happens when a request is started, but it can also +happen when the server closes the connection or when a call to +<a href="#closeConnection">closeConnection</a>() succeeded. +<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#head">head</a>(), <a href="#request">request</a>(), <a href="#closeConnection">closeConnection</a>(), <a href="#state">state</a>(), and <a href="#State-enum">State</a>. + +<!-- eof --> +<hr><p> +This file is part of the <a href="index.html">Qt toolkit</a>. +Copyright © 1995-2007 +<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center> +<table width=100% cellspacing=0 border=0><tr> +<td>Copyright © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>Qt 3.3.8</div> +</table></div></address></body> +</html> |