Thread: Loading Bitmaps into BS_OWNERDRAW buttons

I have searched through and only found MFC codes. I don't quite understand those but i have tried using primitive lines to draw the button out and it worked so is it possible to use a bitmap ? using BitBlt or other better functions ?
Oh yea, i plan to draw a rounded rectangle button with the bitmap enclosed in it, is this possible?

Yes it's posible...

Code:

case WM_DRAWITEM:
	pdis = (LPDRAWITEMSTRUCT) lParam;

	switch (pdis->CtlID)
	{
	case CONTROLID:
		HBITMAP hBitmap ;
		hBitmap = LoadBitmap (hInstance, TEXT ("BITMAP")) ;
		HDC hdcMem = CreateCompatibleDC (pdis->hDC) ;
		SelectObject (hdcMem, hBitmap) ;

		BITMAP bm ;
		GetObject (hBitmap, sizeof(BITMAP), &bitmap) ;

		BitBlt (pdis->hDC, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
	}

	return 0 ;

THANZ ! let me try it and i will ask if theres anymor questions

Please note that jagi's code, which I'm sure is provided as a proof of concept, is simplified and so doesn't release any gdi resources. If you are to implement his suggestion then you should use DeleteDC on any memory device context(dc) created with CreateCompatibleDC and DeleteObject on the loaded bitmap. For performance reasons it's better to create the dc and load the bitmap once and then delete them when you are done with them, for example when your program terminates, perhaps in a WM_DESTROY handler.

Thanz Ken, but i decided to draw the rectangle out and insert an icon instead to minimize space. Bitmaps just take up 2 much space, anyway i heard about a bitmap compressor, how does it work and will it affect the quality of the bitmap ?
KEN or anyone, can you explain this 2 value from LPDRAWITEMSTRUCT->itemstate ODS_SELECTED and ODS_FOCUS, does ODS_SELECTED refer to when i click the mouse or when the mouse is above ? whereas ODS_FOCUS is thru the keyboard ? I dont quite understand, did a lot of search but they didn't state the meaning.