--- PatchGenerator.cpp.old	2007-08-28 17:22:14.000000000 -0300
+++ PatchGenerator.cpp	2008-09-11 16:28:58.553382100 -0300
@@ -54,26 +54,34 @@
 
 	const QString GENPAT_EXE( "GenPat.exe" );
 
+    QProcess genPat;
+
 	qDebug( "Creating patch file: %s", patchFile.toAscii().constData() );
 
 	createDirectoryForPatchFileIfNecessary( patchFile );
 
-	QProcess genPat;
 	genPat.start( GENPAT_EXE, arguments );
 
-	if( genPat.error() == QProcess::FailedToStart ||
-		genPat.error() == QProcess::Crashed )
-	{
-		throw QString( "GenPat failed to start" );
-	}
-
-	const int MSECS_IN_MIN = 60 * 1000;
+    const int MSECS_IN_MIN = 60 * 1000;
 	const int TIMEOUT_SECS = 60 * MSECS_IN_MIN; // 60 mins
 
-	if( ! genPat.waitForFinished( TIMEOUT_SECS ) )
+    if( ! genPat.waitForFinished( TIMEOUT_SECS ) )
 	{
-		throw( QString( "Timed out waiting on GenPat") );
-	}
+        switch (genPat.error()) {
+            case QProcess::FailedToStart:
+                throw QString( "The process failed to start. Either the invoked program is missing, or you may have insufficient permissions to invoke the program." );
+            case QProcess::Crashed:
+                throw QString( "The process crashed some time after starting successfully.");
+            case QProcess::Timedout:
+                throw QString( "The last waitFor...() function timed out. The state of QProcess is unchanged, and you can try calling waitFor...() again.");
+            case QProcess::WriteError:
+                throw QString( "An error occurred when attempting to write to the process. For example, the process may not be running, or it may have closed its input channel.");
+            case QProcess::ReadError:
+                throw QString( "An error occurred when attempting to read from the process. For example, the process may not be running.");
+            case QProcess::UnknownError:
+                throw QString( "An unknown error occurred. This is the default return value of error().");
+        }
+    }
 
 	switch( genPat.exitCode( ) )
 	{