Add ability to obtain error messages from async calls

(cherry picked from commit 6d564efb42)

tools/dbusxml2qt3/classgen.cpp

@@ -243,6 +243,8 @@ static void writeHeaderIncludes(const Class& classData, Class::Role role,
             break;
     }
 
+    includes["tqdbus"].insertString("<tqdbuserror.h>");
+
     if (!includes["TQt"].isEmpty())
         writeIncludes("TQt", includes["TQt"].keys(), stream);
 
@@ -663,6 +665,7 @@ static void writeSignalDeclarations(const Class& classData, Class::Role role,
 
         case Class::Proxy:
             stream << "signals:" << endl;
+            stream << "    void AsyncErrorResponseDetected(int asyncCallId, const TQT_DBusError error);" << endl << endl;
             prefix = "    void ";
             break;
 

tools/dbusxml2qt3/methodgen.cpp

@@ -1576,7 +1576,11 @@ void MethodGenerator::writeProxyAsyncReplyHandler(const Class& classData,
 
         // FIXME tricking writeVariables and writeSignalEmit into writing
         // the reply emit code by manipulating arguments and name
-        stream << "        int _asyncCallId = asyncCallId;" << endl;
+        stream << "        int _asyncCallId = asyncCallId;" << endl << endl;
+
+        stream << "        if (message.type() == TQT_DBusMessage::ErrorMessage) {" << endl;
+        stream << "            emit AsyncErrorResponseDetected(_asyncCallId, message.error());" << endl;
+        stream << "        }" << endl << endl;
 
         Method signal = *it;
         signal.arguments.pop_front();