qurloperator.html

来自「QT 下载资料仅供参考」· HTML 代码 · 共 511 行 · 第 1/3 页

<h3 class=fn>void <a name="connectionStateChanged"></a>QUrlOperator::connectionStateChanged ( int&nbsp;state, const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;data )<tt> [signal]</tt>
</h3>

<p> This signal is emitted whenever the URL operator's connection
state changes. <em>state</em> describes the new state, which is a
<a href="qnetworkprotocol.html#ConnectionState-enum">QNetworkProtocol::ConnectionState</a> value.
<p> <em>data</em> is a string that describes the change of the connection.
This can be used to display a message to the user.

<h3 class=fn><a href="qptrlist.html">QPtrList</a>&lt;QNetworkOperation&gt; <a name="copy"></a>QUrlOperator::copy ( const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;from, const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;to, bool&nbsp;move = FALSE, bool&nbsp;toPath = TRUE )<tt> [virtual]</tt>
</h3>
Copies the file <em>from</em> to <em>to</em>. If <em>move</em> is TRUE, the file is
moved (copied and removed). <em>from</em> must point to a file and <em>to</em>
must point to a directory (into which <em>from</em> is copied) unless <em>toPath</em> is set to FALSE. If <em>toPath</em> is set to FALSE then the <em>to</em> variable is assumed to be the absolute file path (destination
file path + file name). The copying is done using the <a href="#get">get</a>() and
<a href="#put">put</a>() operations. If you want to be notified about the progress of
the operation, connect to the <a href="#dataTransferProgress">dataTransferProgress</a>() signal. Bear
in mind that the get() and put() operations emit this signal
through the QUrlOperator. The number of transferred bytes and the
total bytes that you receive as arguments in this signal do not
relate to the the whole copy operation; they relate first to the
get() and then to the put() operation. Always check what type of
operation the signal comes from; this is given in the signal's
last argument.
<p> At the end, <a href="#finished">finished</a>() (with success or failure) is emitted, so
check the state of the network operation object to see whether or
not the operation was successful.
<p> Because a move or copy operation consists of multiple operations
(get(), put() and maybe <a href="#remove">remove</a>()), this function doesn't return a
single <a href="qnetworkoperation.html">QNetworkOperation</a>, but rather a list of them. They are in
the order: <a href="#get">get</a>(), <a href="#put">put</a>() and (if applicable) remove().
<p> <p>See also <a href="#get">get</a>() and <a href="#put">put</a>().

<h3 class=fn>void <a name="copy-2"></a>QUrlOperator::copy ( const&nbsp;<a href="qstringlist.html">QStringList</a>&nbsp;&amp;&nbsp;files, const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;dest, bool&nbsp;move = FALSE )<tt> [virtual]</tt>
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Copies the <em>files</em> to the directory <em>dest</em>. If <em>move</em> is TRUE
the files are moved, not copied. <em>dest</em> must point to a
directory.
<p> This function calls <a href="#copy">copy</a>() for each entry in <em>files</em> in turn. You
don't get a result from this function; each time a new copy
begins, <a href="#startedNextCopy">startedNextCopy</a>() is emitted, with a list of
QNetworkOperations that describe the new copy operation.

<h3 class=fn>void <a name="createdDirectory"></a>QUrlOperator::createdDirectory ( const&nbsp;<a href="qurlinfo.html">QUrlInfo</a>&nbsp;&amp;&nbsp;i, <a href="qnetworkoperation.html">QNetworkOperation</a>&nbsp;*&nbsp;op )<tt> [signal]</tt>
</h3>

<p> This signal is emitted when <a href="#mkdir">mkdir</a>() succeeds and the directory has
been created. <em>i</em> holds the information about the new directory.
<p> <em>op</em> is a pointer to the operation object, which contains all the
information about the operation, including the state.
<tt>op-&gt;arg(0)</tt> holds the new directory's name.
<p> <p>See also <a href="qnetworkoperation.html">QNetworkOperation</a> and <a href="qnetworkprotocol.html">QNetworkProtocol</a>.

<h3 class=fn>void <a name="data"></a>QUrlOperator::data ( const&nbsp;<a href="qbytearray.html">QByteArray</a>&nbsp;&amp;&nbsp;data, <a href="qnetworkoperation.html">QNetworkOperation</a>&nbsp;*&nbsp;op )<tt> [signal]</tt>
</h3>

<p> This signal is emitted when new <em>data</em> has been received after calling
<a href="#get">get</a>() or <a href="#put">put</a>().
<em>op</em> is a pointer to the operation object which contains all
the information about the operation, including the state.
<tt>op-&gt;arg(0)</tt> holds the name of the file whose data is retrieved
and op->rawArg(1) holds the (raw) data.
<p> <p>See also <a href="qnetworkoperation.html">QNetworkOperation</a> and <a href="qnetworkprotocol.html">QNetworkProtocol</a>.

<h3 class=fn>void <a name="dataTransferProgress"></a>QUrlOperator::dataTransferProgress ( int&nbsp;bytesDone, int&nbsp;bytesTotal, <a href="qnetworkoperation.html">QNetworkOperation</a>&nbsp;*&nbsp;op )<tt> [signal]</tt>
</h3>

<p> This signal is emitted during data transfer (using <a href="#put">put</a>() or
<a href="#get">get</a>()). <em>bytesDone</em> specifies how many bytes of <em>bytesTotal</em> have
been transferred. More information about the operation is stored in
<em>op</em>, a pointer to the network operation that is processed.
<em>bytesTotal</em> may be -1, which means that the total number of bytes
is not known.
<p> <p>See also <a href="qnetworkoperation.html">QNetworkOperation</a> and <a href="qnetworkprotocol.html">QNetworkProtocol</a>.

<h3 class=fn>void <a name="deleteNetworkProtocol"></a>QUrlOperator::deleteNetworkProtocol ()<tt> [protected]</tt>
</h3>
Deletes the currently used network protocol.

<h3 class=fn>void <a name="finished"></a>QUrlOperator::finished ( <a href="qnetworkoperation.html">QNetworkOperation</a>&nbsp;*&nbsp;op )<tt> [signal]</tt>
</h3>

<p> This signal is emitted when an operation of some sort finishes,
whether with success or failure. <em>op</em> is a pointer to the
operation object, which contains all the information, including
the state, of the operation which has been finished. Check the
state and error code of the operation object to see whether or not
the operation was successful.
<p> <p>See also <a href="qnetworkoperation.html">QNetworkOperation</a> and <a href="qnetworkprotocol.html">QNetworkProtocol</a>.

<h3 class=fn>const&nbsp;<a href="qnetworkoperation.html">QNetworkOperation</a>&nbsp;* <a name="get"></a>QUrlOperator::get ( const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;location = QString::null )<tt> [virtual]</tt>
</h3>
Tells the network protocol to get data from <em>location</em> or, if
this is <a href="qstring.html#QString-null">QString::null</a>, to get data from the location to which this
URL points (see <a href="qurl.html#fileName">QUrl::fileName</a>() and <a href="qurl.html#encodedPathAndQuery">QUrl::encodedPathAndQuery</a>()).
What happens then depends on the network protocol. The <a href="#data">data</a>()
signal is emitted when data comes in. Because it's unlikely that
all data will come in at once, it is common for multiple data()
signals to be emitted. The <a href="#dataTransferProgress">dataTransferProgress</a>() signal is
emitted while processing the operation. At the end, <a href="#finished">finished</a>()
(with success or failure) is emitted, so check the state of the
network operation object to see whether or not the operation was
successful.
<p> If <em>location</em> is QString::null, the path of this QUrlOperator
should point to a file when you use this operation. If <em>location</em>
is not empty, it can be a relative URL (a child of the path to
which the QUrlOperator points) or an absolute URL.
<p> For example, to get a web page you might do something like this:
<p> <pre>
    QUrlOperator op( "http://www.whatever.org/cgi-bin/search.pl?cmd=Hello" );
    op.<a href="#get">get</a>();
    </pre>
 
<p> For most other operations, the path of the QUrlOperator must point
to a directory. If you want to download a file you could do the
following:
<p> <pre>
    QUrlOperator op( "ftp://ftp.whatever.org/pub" );
    // do some other stuff like op.<a href="#listChildren">listChildren</a>() or op.<a href="#mkdir">mkdir</a>( "new_dir" )
    op.<a href="#get">get</a>( "a_file.txt" );
    </pre>
 
<p> This will get the data of ftp://ftp.whatever.org/pub/a_file.txt.
<p> <em>Never</em> do anything like this:
<pre>
    QUrlOperator op( "http://www.whatever.org/cgi-bin" );
    op.<a href="#get">get</a>( "search.pl?cmd=Hello" ); // WRONG!
    </pre>
 
<p> If <em>location</em> is not empty and relative it must not contain any
queries or references, just the name of a child. So if you need to
specify a query or reference, do it as shown in the first example
or specify the full URL (such as
http://www.whatever.org/cgi-bin/search.pl?cmd=Hello) as <em>location</em>.
<p> <p>See also <a href="#copy">copy</a>().

<h3 class=fn>void <a name="getNetworkProtocol"></a>QUrlOperator::getNetworkProtocol ()<tt> [protected]</tt>
</h3>
Finds a network protocol for the URL and deletes the old network protocol.

<h3 class=fn><a href="qurlinfo.html">QUrlInfo</a> <a name="info"></a>QUrlOperator::info ( const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;entry ) const<tt> [virtual]</tt>
</h3>
Returns the URL information for the child <em>entry</em>, or returns an
empty <a href="qurlinfo.html">QUrlInfo</a> object if there is no information available about
<em>entry</em>.

<h3 class=fn>bool <a name="isDir"></a>QUrlOperator::isDir ( bool&nbsp;*&nbsp;ok = 0 )<tt> [virtual]</tt>
</h3>
Returns TRUE if the URL is a directory; otherwise returns FALSE.
This may not always work correctly, if the protocol of the URL is
something other than file (local filesystem). If you pass a bool
pointer as the <em>ok</em> argument, <em>*ok</em> is set to TRUE if the result
of this function is known to be correct, and to FALSE otherwise.

<h3 class=fn>void <a name="itemChanged"></a>QUrlOperator::itemChanged ( <a href="qnetworkoperation.html">QNetworkOperation</a>&nbsp;*&nbsp;op )<tt> [signal]</tt>
</h3>

<p> This signal is emitted whenever a file which is a child of the URL
has been changed, for example by successfully calling <a href="#rename">rename</a>().
<em>op</em> is a pointer to the operation object which contains all the
information about the operation, including the state.
<tt>op-&gt;arg(0)</tt> holds the original file name and <tt>op-&gt;arg(1)</tt> holds
the new file name (if it was changed).
<p> <p>See also <a href="qnetworkoperation.html">QNetworkOperation</a> and <a href="qnetworkprotocol.html">QNetworkProtocol</a>.

<h3 class=fn>const&nbsp;<a href="qnetworkoperation.html">QNetworkOperation</a>&nbsp;* <a name="listChildren"></a>QUrlOperator::listChildren ()<tt> [virtual]</tt>
</h3>
Starts listing the children of this URL (e.g. the files in the
directory). The <a href="#start">start</a>() signal is emitted before the first entry