diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index c840a62057..2e7bc632ab 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -16,6 +16,18 @@
    The license applies to all entries newer than 2009-04-28.
 */
 
+2012-05-08 15:14 UTC-0800 Pritpal Bedi (bedipritpal@hotmail.com)
+  * contrib/hbqt/qtnetwork/qth/QFtp.qth
+  * contrib/hbqt/qtnetwork/qth/QHttp.qth
+  * contrib/hbqt/qtnetwork/qth/QHttpHeader.qth
+  * contrib/hbqt/qtnetwork/qth/QHttpRequestHeader.qth
+  * contrib/hbqt/qtnetwork/qth/QHttpResponseHeader.qth
+  * contrib/hbqt/qtnetwork/qth/QNetworkProxy.qth
+  * contrib/hbqt/qtnetwork/qth/QNetworkRequest.qth
+  * contrib/hbqt/qtnetwork/qth/QUrlInfo.qth
+    - Replaced: HB_ISOBJECT() => hbqt_par_isDerivedFrom()
+    * Rationalized: constructors.
+
 2012-05-08 18:20 UTC+0200 Viktor Szakats (harbour syenar.net)
   * contrib/hbnetio/utils/hbnetio/netiosrv.prg
   * contrib/hbrun/plugins.prg
diff --git a/harbour/contrib/hbqt/qtnetwork/qth/QFtp.qth b/harbour/contrib/hbqt/qtnetwork/qth/QFtp.qth
index 32b3d2fff4..a1b23e841c 100644
--- a/harbour/contrib/hbqt/qtnetwork/qth/QFtp.qth
+++ b/harbour/contrib/hbqt/qtnetwork/qth/QFtp.qth
@@ -29,7 +29,14 @@ New      = pParent
  */
 HB_FUNC( QT_QFTP )
 {
-   __HB_RETPTRGC__( new QFtp( hbqt_par_QObject( 1 ) ) );
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QOBJECT" ) )
+   {
+      __HB_RETPTRGC__( new QFtp( hbqt_par_QObject( 1 ) ) );
+   }
+   else
+   {
+      __HB_RETPTRGC__( new QFtp() );
+   }      
 }
 
 /*
diff --git a/harbour/contrib/hbqt/qtnetwork/qth/QHttp.qth b/harbour/contrib/hbqt/qtnetwork/qth/QHttp.qth
index 1c00b13bae..6b0c603712 100644
--- a/harbour/contrib/hbqt/qtnetwork/qth/QHttp.qth
+++ b/harbour/contrib/hbqt/qtnetwork/qth/QHttp.qth
@@ -31,7 +31,20 @@ New      = pParent
  */
 HB_FUNC( QT_QHTTP )
 {
-   __HB_RETPTRGC__( new QHttp( hbqt_par_QObject( 1 ) ) );
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QOBJECT" ) )
+   {
+      __HB_RETPTRGC__( new QHttp( hbqt_par_QObject( 1 ) ) );
+   }
+   else if( hb_pcount() == 1 && HB_ISCHAR( 1 ) )
+   {
+      void * pText01 = NULL;
+      __HB_RETPTRGC__( new QHttp( hb_parstr_utf8( 1, &pText01, NULL ) ) );
+      hb_strfree( pText01 );
+   }
+   else
+   {
+      __HB_RETPTRGC__( new QHttp() );
+   }      
 }
 
 /*
@@ -83,7 +96,7 @@ int request ( const QHttpRequestHeader & header, const QByteArray & data, QIODev
 //int setHost ( const QString & hostName, quint16 port = 80 )
 int setHost ( const QString & hostName, ConnectionMode mode, quint16 port = 0 )
 int setProxy ( const QString & host, int port, const QString & username = QString(), const QString & password = QString() )
-// int setProxy ( const QNetworkProxy & proxy )
+int setProxy ( const QNetworkProxy & proxy )
 // int setSocket ( QTcpSocket * socket )
 int setUser ( const QString & userName, const QString & password = QString() )
 State state () const
diff --git a/harbour/contrib/hbqt/qtnetwork/qth/QHttpHeader.qth b/harbour/contrib/hbqt/qtnetwork/qth/QHttpHeader.qth
index e56caf07ce..84906a7c02 100644
--- a/harbour/contrib/hbqt/qtnetwork/qth/QHttpHeader.qth
+++ b/harbour/contrib/hbqt/qtnetwork/qth/QHttpHeader.qth
@@ -32,7 +32,22 @@ Constructor = no
  */
 HB_FUNC( QT_QHTTPHEADER )
 {
-   
+/*  //QHttpHeader.cpp:128:67: error: cannot allocate an object of abstract type 'QHttpHeader'  // This can be subclassed only
+   if( hb_pcount() == 1 && HB_ISCHAR( 1 ) )
+   {
+      void * pText01 = NULL;
+      __HB_RETPTRGC__( new QHttpHeader( hb_parstr_utf8( 1, &pText01, NULL ) ) );
+      hb_strfree( pText01 );
+   }
+   else if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QHTTPHEADER" ) )
+   {
+      __HB_RETPTRGC__( new QHttpHeader( *hbqt_par_QHttpHeader( 1 ) ) );
+   }
+   else
+   {
+      __HB_RETPTRGC__( new QHttpHeader() );
+   }   
+*/   
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtnetwork/qth/QHttpRequestHeader.qth b/harbour/contrib/hbqt/qtnetwork/qth/QHttpRequestHeader.qth
index cb5f60eb2e..5e33aeb71a 100644
--- a/harbour/contrib/hbqt/qtnetwork/qth/QHttpRequestHeader.qth
+++ b/harbour/contrib/hbqt/qtnetwork/qth/QHttpRequestHeader.qth
@@ -30,7 +30,28 @@ Destructor =
  */
 HB_FUNC( QT_QHTTPREQUESTHEADER )
 {
-   __HB_RETPTRGC__( new QHttpRequestHeader() );
+   if( hb_pcount() == 1 && HB_ISCHAR( 1 ) )
+   {
+      void * pText01 = NULL;
+      __HB_RETPTRGC__( new QHttpRequestHeader( hb_parstr_utf8( 1, &pText01, NULL ) ) );
+      hb_strfree( pText01 );
+   }
+   else if( hb_pcount() >= 2 && HB_ISCHAR( 1 ) && HB_ISCHAR( 2 ) )
+   {
+      void * pText01 = NULL;
+      void * pText02 = NULL;
+      __HB_RETPTRGC__( new QHttpRequestHeader( hb_parstr_utf8( 1, &pText01, NULL ), hb_parstr_utf8( 2, &pText02, NULL ), HB_ISNUM( 3 ) ? hb_parni( 3 ) : 1, HB_ISNUM( 4 ) ? hb_parni( 4 ) : 1 ) );
+      hb_strfree( pText01 );
+      hb_strfree( pText02 );
+   }
+   else if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QHTTPREQUESTHEADER" ) )
+   {
+      __HB_RETPTRGC__( new QHttpRequestHeader( *hbqt_par_QHttpRequestHeader( 1 ) ) );
+   }
+   else
+   {   
+      __HB_RETPTRGC__( new QHttpRequestHeader() );
+   }   
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtnetwork/qth/QHttpResponseHeader.qth b/harbour/contrib/hbqt/qtnetwork/qth/QHttpResponseHeader.qth
index b41623b51a..254cc4fc4f 100644
--- a/harbour/contrib/hbqt/qtnetwork/qth/QHttpResponseHeader.qth
+++ b/harbour/contrib/hbqt/qtnetwork/qth/QHttpResponseHeader.qth
@@ -30,7 +30,30 @@ Destructor =
  */
 HB_FUNC( QT_QHTTPRESPONSEHEADER )
 {
-   __HB_RETPTRGC__( new QHttpResponseHeader() );
+   if( hb_pcount() == 1 && HB_ISCHAR( 1 ) )
+   {
+      void * pText01 = NULL;
+      __HB_RETPTRGC__( new QHttpResponseHeader( hb_parstr_utf8( 1, &pText01, NULL ) ) );
+      hb_strfree( pText01 );
+   }
+   else if( hb_pcount() >= 2 && HB_ISNUM( 1 ) && HB_ISCHAR( 2 ) )
+   {
+      void * pText01 = NULL;
+      __HB_RETPTRGC__( new QHttpResponseHeader( hb_parni( 1 ), hb_parstr_utf8( 2, &pText01, NULL ), HB_ISNUM( 3 ) ? hb_parni( 3 ) : 1, HB_ISNUM( 4 ) ? hb_parni( 4 ) : 1 ) );
+      hb_strfree( pText01 );
+   }
+   else if( hb_pcount() == 1 && HB_ISNUM( 1 ) )
+   {
+      __HB_RETPTRGC__( new QHttpResponseHeader( hb_parni( 1 ) ) );
+   }
+   else if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QHTTPRESPONSEHEADER" ) )
+   {
+      __HB_RETPTRGC__( new QHttpResponseHeader( *hbqt_par_QHttpResponseHeader( 1 ) ) );
+   }
+   else
+   {   
+      __HB_RETPTRGC__( new QHttpResponseHeader() );
+   }   
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtnetwork/qth/QNetworkProxy.qth b/harbour/contrib/hbqt/qtnetwork/qth/QNetworkProxy.qth
index 900c490835..73fe2ae58d 100644
--- a/harbour/contrib/hbqt/qtnetwork/qth/QNetworkProxy.qth
+++ b/harbour/contrib/hbqt/qtnetwork/qth/QNetworkProxy.qth
@@ -32,14 +32,14 @@ New      =
  */
 HB_FUNC( QT_QNETWORKPROXY )
 {
-   if( hb_pcount() == 1 && HB_ISOBJECT( 1 ) )
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QNETWORKPROXY" ) )
    {
       __HB_RETPTRGC__( new QNetworkProxy( *hbqt_par_QNetworkProxy( 1 ) ) );
    }
    else if( hb_pcount() >= 2 && HB_ISNUM( 1 ) && HB_ISCHAR( 2 ) )
    {
       void * pText01 = NULL;
-      __HB_RETPTRGC__( new QNetworkProxy( ( QNetworkProxy::ProxyType ) hb_parni( 1 ), hb_parstr_utf8( 2, &pText01, NULL ), ( quint16 ) ( HB_ISNUM( 3 ) ? hb_parni( 3 ) : 0 ), ( HB_ISCHAR( 4 ) ? hbqt_par_QString( 4 ) : QString() ), ( HB_ISCHAR( 5 ) ? hbqt_par_QString( 5 ) : QString() ) ) );
+      __HB_RETPTRGC__( new QNetworkProxy( ( QNetworkProxy::ProxyType ) hb_parni( 1 ), hb_parstr_utf8( 2, &pText01, NULL ), ( quint16 ) hb_parni( 3 ), QString(), QString() ) );
       hb_strfree( pText01 );
    }
    else if( hb_pcount() >= 1 && HB_ISNUM( 1 ) )
diff --git a/harbour/contrib/hbqt/qtnetwork/qth/QNetworkRequest.qth b/harbour/contrib/hbqt/qtnetwork/qth/QNetworkRequest.qth
index 5ee0b1ef1b..69a801e113 100644
--- a/harbour/contrib/hbqt/qtnetwork/qth/QNetworkRequest.qth
+++ b/harbour/contrib/hbqt/qtnetwork/qth/QNetworkRequest.qth
@@ -29,7 +29,18 @@ Destructor =
  */
 HB_FUNC( QT_QNETWORKREQUEST )
 {
-   __HB_RETPTRGC__( new QNetworkRequest() );
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QURL" ) )
+   {
+      __HB_RETPTRGC__( new QNetworkRequest( *hbqt_par_QUrl( 1 ) ) );
+   }
+   else if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QNETWORKREQUEST" ) )
+   {
+      __HB_RETPTRGC__( new QNetworkRequest( *hbqt_par_QNetworkRequest( 1 ) ) );
+   }
+   else
+   {   
+      __HB_RETPTRGC__( new QNetworkRequest() );
+   }   
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtnetwork/qth/QUrlInfo.qth b/harbour/contrib/hbqt/qtnetwork/qth/QUrlInfo.qth
index 5127631ba6..1f5d61b311 100644
--- a/harbour/contrib/hbqt/qtnetwork/qth/QUrlInfo.qth
+++ b/harbour/contrib/hbqt/qtnetwork/qth/QUrlInfo.qth
@@ -34,7 +34,7 @@ New      =
  */
 HB_FUNC( QT_QURLINFO )
 {
-   if( hb_pcount() == 1 && HB_ISOBJECT( 1 ) )
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QURLINFO" ) )
    {
       __HB_RETPTRGC__( new QUrlInfo( *hbqt_par_QUrlInfo( 1 ) ) );
    }