Strange problem when creating and printing a blank window

[alcopops]

I have this code which should create a new red window and then print it. Except it only works when I include the CWsScreenDevice function SizeInPixels() after the gc->Clear() command. Everything seems to work as it should, except nothing is displayed on the screen. I am using this code with the Series 60 emulator under VC++ 6. Is it a compiler bug or something as SizeInPixels() has nothing to do with the creation or printing of the window.


wscheck = ws.Connect();
if (wscheck != KErrNone) return ERROR;

iScreenDevice = new(ELeave) CWsScreenDevice(ws);
iScreenDevice->Construct();
RWindowGroup* wg;
wg = new RWindowGroup(ws);
wscheck = wg->Construct(reinterpret_cast<TUint32>(wg), EFalse);
CleanupClosePushL(*wg);
wg->SetOrdinalPosition(10,ECoeWinPriorityAlwaysAtFront);
CWindowGc* gc;
wscheck = iScreenDevice->CreateContext(gc);
CleanupStack::PushL(gc);

RWindow window(ws);
ScreenSize= iScreenDevice->SizeInPixels();
wscheck = window.Construct(*wg, reinterpret_cast<TUint32>(wg) + 1);
window.SetBackgroundColor(TRgb(0xFF, 0, 0));
window.Activate();
window.SetExtent(TPoint(0, 0), ScreenSize);
window.SetVisible(ETrue);


gc->Activate(window);
window.Invalidate();
window.BeginRedraw();
gc->Clear();

window.EndRedraw();

//Only works when this command is included after gc->Clear()???
//ScreenSize= iScreenDevice->SizeInPixels();

[alcopops]

Have found the problem, needed to flush the screen buffer with the line ws.Flush() after gc->Clear(). I presume iScreenDevice->SizeInPixels(); was doing that which was why it was making it work.