active desktop like drawing

[Dreglor]

i been wondering how you draw drectly on to the wallpaper like some programs
take for example ZMatrix
it draws on the wallpaper area with out messing around with the icons or anything
is there an api or somthing i can tap into to do this?

[fweil]

Does ZMatrix use screen mode ? If so use DrawingBufffer() and DrawingBufferpitch () ...

If not I don't know today !

KRgrds

[Dreglor]

it proably an api to get the memory address then that way the problem is that i have no clue what api...

[GedB]

The source for ZMatrix is available on SourceForge:

http://cvs.sourceforge.net/viewcvs.py/z ... iew=markup

It's all COM stuff, though. This looks to be significant:

Code: Select all

	//Find the desktop window classes
	ghProgman = FindWindow(_TEXT("Progman"), _TEXT("Program Manager"));
	if(ghProgman != NULL)
	{
		ghShellDLL = FindWindowEx(ghProgman, 0, _TEXT("SHELLDLL_DefView"), NULL);
		ghSysListView = FindWindowEx(ghShellDLL,0,_TEXT("SysListView32"),NULL);
	}
	else
	{
		ghProgman = FindWindow(_TEXT("DesktopBackgroundClass"), NULL);

		if(ghProgman != NULL)
		{
			ghShellDLL = FindWindowEx(ghProgman, 0, _TEXT("DeskFolder"), NULL);
			ghSysListView = FindWindowEx(ghShellDLL,0,_TEXT("SysListView32"),NULL);
			LiteStepMode = true;
		}
		else
		{
			ghShellDLL = NULL;
			ghSysListView = NULL;
		}
	}

[GedB]

This bit too:

Code: Select all

	case(WM_NCPAINT):
		{
			//return DefWindowProc(hWnd,message,wParam,lParam);
			if(MatrixObject)
			{
				HDC hdc;
				hdc = GetDC(hWnd);
				SelectClipRgn(hdc,ValidRGN);

				SelectObject(MatrixObject->GetBackDC(),MatrixObject->GetBackBitmap());
				BitBlt(hdc,gscreenLeft,gscreenTop,gscreenWidth,gscreenHeight,MatrixObject->GetBackDC(),0,0,SRCCOPY);
//OutputDebugString(_T("NCPainting\n"));

				ReleaseDC(hWnd, hdc);
			}
			return 0;

		}
		break;