NewLC - Unable to use CWindowGC::Drawtext API - Comments

Re: Unable to use CWindowGC::Drawtext API

alh — Mon, 04 Feb 2008 09:50:15 +0100

No. Don't use that code.

Its much better to just implement the draw function of a CCoeControl, and display this one.

Yogesh code will work to output some text on the screen, but it is a very hacky way to do it, and will produce errors whenever your view gets a redraw event.
(parts or all of the text will disappear from the screen, and not be redrawn until this code is called again)

If you implement the Draw function, the framework will do all those BeginRedraw/EndRedraw and such for you, so you wont have to write that code yourself, plus any redraws of the view will also work.

Re: Unable to use CWindowGC::Drawtext API

yogesh.bhople — Sat, 02 Feb 2008 09:25:27 +0100

Hi KamalPreet,

Use following cade :

       Window().Invalidate();
        
        ActivateGc();
        
        Window().BeginRedraw();
        
        CWindowGc& gc = SystemGc();

      gc.UseFont(iEikonEnv->TitleFont());

       gc.DrawText(aText, Rect().Center());

        Window().EndRedraw();
        
        DeactivateGc();

This code may be solve your problem.

Thanks And Regards,
Yogesh

Re: Unable to use CWindowGC::Drawtext API

runforu — Sat, 02 Feb 2008 02:50:26 +0100

Wheneve you want to update screen please call DrawNow or DrawDeferred.

Re: Unable to use CWindowGC::Drawtext API

alh — Fri, 12 Oct 2007 14:53:21 +0200

You shouldn't just draw to the gc anytime as you try to do now.

The right way is to implement the Draw() method of a CCoeControl or view to draw the text.

This method will be called by the framework each time the control needs to be drawn, (for example when closing a menu that covered it, or when telling it to be visible) and you can, if needed, initiate a redraw by calling DrawNow().

It will take care of activation and deactivation for you, which might be your problem now (hard to say since you don't say how your app "crash". Try find out the panic error code to get more information on why your app dies.)

Unable to use CWindowGC::Drawtext API

kamalpreet — Fri, 12 Oct 2007 13:37:39 +0200

Hi Friends,
I am new to symbian, I am using CWindowGC::DrawText API but as soon as I am calling that API..... my emulator is crashing.

below is my function:

CSampleAppUIView class is derived from CCoeControl.

void CSampleAppUIView::TextDraw(const TDesC& aText, const TPoint& aPoint)
{
CWindowGc& gc = SystemGc();

gc.UseFont(iEikonEnv->TitleFont());