}/*  QgsHttpTransaction http(url, httpproxyhost, httpproxyport);  // Do a passthrough for the status bar text  connect(          &http, SIGNAL(setStatus        (QString)),           this,   SLOT(showStatusMessage(QString))         );  bool httpOk;  httpOk = http.getSynchronously(imagesource);  if (!httpOk)  {    // We had an HTTP exception    mErrorCaption = tr("HTTP Exception");    mError = http.errorString();    mError += "\n" + tr("Tried URL: ") + url;    return 0;  }  if (http.responseContentType() == "application/vnd.ogc.se_xml")  {    // We had a Service Exception from the WMS    QgsDebugMsg("got Service Exception as:\n"  + QString(imagesource) );    mErrorCaption = tr("WMS Service Exception");    // set mError with the following:    parseServiceExceptionReportDOM(imagesource);    mError += "\n" + tr("Tried URL: ") + url;    QgsDebugMsg("composed error message '" + mError + "'.");#endif    return 0;  }*/  QgsDebugMsg("Response received.");#ifdef QGISDEBUG  //QFile file( "/tmp/qgis-wmsprovider-draw-raw.png" );  //if ( file.open( QIODevice::WriteOnly ) )   //{  //  file.writeBlock(imagesource);  //  file.close();  //}#endif  // Load into the final QImage.  //bool success = i.loadFromData(imagesource);  if (cachedImage)  {    delete cachedImage;  }  cachedImage = new QImage(imagesource);  // Remember settings for useful caching next time.  cachedViewExtent = viewExtent;  cachedPixelWidth = pixelWidth;  cachedPixelHeight = pixelHeight;#ifdef QGISDEBUG  // Get what we can support// Commented out for now, causes segfaults.//  supportedFormats();#endif      QgsDebugMsg("Exiting.");  // TODO: bit depth conversion to the client's expectation//  return *(i.convertDepth(32));  return cachedImage;}/*void QgsWmsProvider::getServerCapabilities(){  QgsDebugMsg("entering.");  retrieveServerCapabilities();  // TODO: Return generic server capabilities here  QgsDebugMsg("exiting.");}*/bool QgsWmsProvider::retrieveServerCapabilities(bool forceRefresh){  QgsDebugMsg("entering.");  if ( httpcapabilitiesresponse.isNull() ||       forceRefresh )  {    QString url = baseUrl + "SERVICE=WMS&REQUEST=GetCapabilities";    httpcapabilitiesresponse = retrieveUrl(url);    if (httpcapabilitiesresponse.isEmpty())    {      return FALSE;    }/*    QgsHttpTransaction http(url, httpproxyhost, httpproxyport);    // Do a passthrough for the status bar text    connect(            &http, SIGNAL(setStatus        (QString)),             this,   SLOT(showStatusMessage(QString))           );    bool httpOk;    httpOk = http.getSynchronously(httpcapabilitiesresponse);    if (!httpOk)    {      // We had an HTTP exception      mErrorCaption = tr("HTTP Exception");      mError = http.errorString();      mError += "\n" + tr("Tried URL: ") + url;    QgsDebugMsg("!httpOK: "  + mError );      return FALSE;    }*/    QgsDebugMsg("Converting to DOM.");    bool domOK;    domOK = parseCapabilitiesDOM(httpcapabilitiesresponse, mCapabilities);    if (!domOK)    {      // We had an DOM exception -       // mErrorCaption and mError are pre-filled by parseCapabilitiesDOM      mError += "\n" + tr("Tried URL: ") + url;      QgsDebugMsg("!domOK: " + mError);      return FALSE;    }  }  QgsDebugMsg("exiting.");  return TRUE;}QByteArray QgsWmsProvider::retrieveUrl(QString url){  QgsDebugMsg("WMS request Url: " + url);  QgsHttpTransaction http(    url,    mHttpProxyHost,    mHttpProxyPort,    mHttpProxyUser,    mHttpProxyPass);  // Do a passthrough for the status bar text  connect(          &http, SIGNAL(setStatus        (QString)),           this,   SLOT(showStatusMessage(QString))         );  QByteArray httpResponse;  bool httpOk;  httpOk = http.getSynchronously(httpResponse);  if (!httpOk)  {    // We had an HTTP exception    mErrorCaption = tr("HTTP Exception");    mError = http.errorString();    mError += "\n" + tr("Tried URL: ") + url;    return QByteArray("");  }  if (http.responseContentType() == "application/vnd.ogc.se_xml")  {    // We had a Service Exception from the WMS    QgsDebugMsg("got Service Exception as:\n" + httpResponse );    mErrorCaption = tr("WMS Service Exception");    // set mError with the following:    parseServiceExceptionReportDOM(httpResponse);    mError += "\n" + tr("Tried URL: ") + url;    QgsDebugMsg("composed error message '" + mError + "'.");    return QByteArray("");  }  return httpResponse;}#if 0// deprecatedbool QgsWmsProvider::downloadCapabilitiesURI(QString const & uri){  QgsDebugMsg("Entered with '"  + uri  + "'");  QgsHttpTransaction http(uri, httpproxyhost, httpproxyport);  // Do a passthrough for the status bar text  connect(          &http, SIGNAL(setStatus        (QString)),           this,   SLOT(showStatusMessage(QString))         );  bool httpOk;  httpOk = http.getSynchronously(httpcapabilitiesresponse);  if (!httpOk)  {    // We had an HTTP exception    mErrorCaption = tr("HTTP Exception");    mError = http.errorString();    mError += "\n" + tr("Tried URL: ") + uri;    QgsDebugMsg("!httpOK: "  + mError );    return FALSE;  }  QgsDebugMsg("Converting to DOM.");  bool domOK;  domOK = parseCapabilitiesDOM(httpcapabilitiesresponse, capabilities);  if (!domOK)  {    // We had an DOM exception -     // mErrorCaption and mError are pre-filled by parseCapabilitiesDOM    mError += "\n" + tr("Tried URL: ") + uri;  QgsDebugMsg("!domOK: " + mError );    return FALSE;  }  QgsDebugMsg("exiting.");  return TRUE;}#endifbool QgsWmsProvider::parseCapabilitiesDOM(QByteArray const & xml, QgsWmsCapabilitiesProperty& capabilitiesProperty){  QgsDebugMsg("entering.");#ifdef QGISDEBUG  //test the content of the QByteArray.  // There is a bug in Qt4.1.2, due for fixing in 4.2.0, where  // QString(QByteArray) uses strlen to find the length of the  // QByteArray. However, there are no guarantees that the QByteArray  // has a terminating \0, and hence this can cause a crash, so we supply  // the qbytearray to qstring in a way that ensures that there is a  // terminating \0, and just to be safe, we also give it the actual  // size.  // Also, the Qt qWarning() function has a limit of 8192 bytes per  // message, which can easily be exceeded by wms capability  // documents, so we use the qgs logger stuff instead which doesn't  // have that limitation.  QString responsestring(QString::fromAscii(xml.constData(), xml.size()));  QgsLogger::debug("QgsWmsProvider::parseCapabilitiesDOM, received the following data: "+responsestring);    //QFile file( "/tmp/qgis-wmsprovider-capabilities.xml" );  //if ( file.open( QIODevice::WriteOnly ) )   //{  //  file.writeBlock(xml);  //  file.close();  //}#endif    // Convert completed document into a DOM  QString errorMsg;  int errorLine;  int errorColumn;  bool contentSuccess = capabilitiesDOM.setContent(xml, false, &errorMsg, &errorLine, &errorColumn);  if (!contentSuccess)  {    mErrorCaption = tr("DOM Exception");    mError = QString(tr("Could not get WMS capabilities: %1 at line %2 column %3")                .arg(errorMsg)                .arg(errorLine)                .arg(errorColumn) );    mError += "\n" + tr("This is probably due to an incorrect WMS Server URL.");  QgsLogger::debug("DOM Exception: "+mError);    return FALSE;  }  QDomElement docElem = capabilitiesDOM.documentElement();  // Assert that the DTD is what we expected (i.e. a WMS Capabilities document)  QgsDebugMsg("testing tagName " + docElem.tagName() );  if (!      (       (docElem.tagName() == "WMS_Capabilities")     // (1.3 vintage)       ||       (docElem.tagName() == "WMT_MS_Capabilities")  // (1.1.1 vintage)      )     )  {    mErrorCaption = tr("DOM Exception");    mError = QString(tr("Could not get WMS capabilities in the "                        "expected format (DTD): no %1 or %2 found")                .arg("WMS_Capabilities")                .arg("WMT_MS_Capabilities")             );    mError += "\n" + tr("This is probably due to an incorrect WMS Server URL.");  QgsLogger::debug("DOM Exception: "+mError);    return FALSE;  }  capabilitiesProperty.version = docElem.attribute("version");  // Start walking through XML.  QDomNode n = docElem.firstChild();  while( !n.isNull() ) {      QDomElement e = n.toElement(); // try to convert the node to an element.      if( !e.isNull() ) {          //QgsDebugMsg(e.tagName() ); // the node really is an element.          if      (e.tagName() == "Service")          {            QgsDebugMsg("  Service.");            parseService(e, capabilitiesProperty.service);          }          else if (e.tagName() == "Capability")          {            QgsDebugMsg("  Capability.");            parseCapability(e, capabilitiesProperty.capability);          }      }      n = n.nextSibling();  }  QgsDebugMsg("exiting.");  return TRUE;}void QgsWmsProvider::parseService(QDomElement const & e, QgsWmsServiceProperty& serviceProperty){  QgsDebugMsg("entering.");  QDomNode n1 = e.firstChild();  while( !n1.isNull() ) {      QDomElement e1 = n1.toElement(); // try to convert the node to an element.      if( !e1.isNull() ) {          //QgsDebugMsg("  "  + e1.tagName() ); // the node really is an element.          if      (e1.tagName() == "Title")          {            serviceProperty.title = e1.text();          }          else if (e1.tagName() == "Abstract")          {            serviceProperty.abstract = e1.text();          }          else if (e1.tagName() == "KeywordList")          {            parseKeywordList(e1, serviceProperty.keywordList);          }          else if (e1.tagName() == "OnlineResource")          {            parseOnlineResource(e1, serviceProperty.onlineResource);          }          else if (e1.tagName() == "ContactInformation")          {            parseContactInformation(e1, serviceProperty.contactInformation);          }          else if (e1.tagName() == "Fees")          {            serviceProperty.fees = e1.text();          }          else if (e1.tagName() == "AccessConstraints")          {            serviceProperty.accessConstraints = e1.text();          }          else if (e1.tagName() == "LayerLimit")          {            serviceProperty.layerLimit = e1.text().toUInt();          }          else if (e1.tagName() == "MaxWidth")          {            serviceProperty.maxWidth = e1.text().toUInt();          }          else if (e1.tagName() == "MaxHeight")          {            serviceProperty.maxHeight = e1.text().toUInt();          }      }      n1 = n1.nextSibling();  }