Thread: Drawing a bitmap when a button is pressed

Hallo,

I am trying to display a .bmp image on the screen when I press a button. This is probably simple, but I cant get it work and I must admit that I find the msdn very confusing (although I am starting to learn my way around).

I was able to load and display the image on the screen using WM_PAINT, but then it was under my other media object (I am streaming from a web camera) and it was visible all the time.

So, is there a way to display a bmp image over all the other elements when a button is pressed?

Here is the code I am using(which do not work)

Code:

case WM_COMMAND:
{
// Check if the mouse button has been clicked
if(HIWORD(wParam) == BN_CLICKED)
{
	// See if it clicked any of the buttons
	if((wParam) == BUTTON_PLAY)
	{
		PAINTSTRUCT ps;

		HBITMAP img = (HBITMAP) LoadImage(NULL, TEXT("C:\\Users\\Ole\\Documents\\frames\\animasjonsFrame_0.bmp"), 
						          IMAGE_BITMAP,640,480,LR_LOADFROMFILE );

		if(img == NULL)
			MessageBox(NULL, TEXT("ERROR loading"), TEXT("Error"), MB_ICONERROR|MB_OK);

		BITMAP bm;
		HDC hdc = BeginPaint(hWnd, &ps);;

		HDC hdcMem = CreateCompatibleDC(hdc);
		HBITMAP hbmOld = (HBITMAP)SelectObject(hdcMem, img);
		GetObject(img, sizeof(bm), &bm);

		BitBlt(hdc, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);

		SelectObject(hdcMem, hbmOld);
		DeleteDC(hdcMem);

		EndPaint(hWnd, &ps);

		int currentTime = GetTickCount();
		while(currentTime + 500 > GetTickCount());

		ShowWindow(hWnd, SW_SHOW); 
	} 
	//.....
}

Code:

		int currentTime = GetTickCount();
		while(currentTime + 500 > GetTickCount());

What is wrong with "Sleep(500)"?

--
Mats

Try loading the image to a static window, and hiding the static window until the button is pressed. That's assuming you have the image loaded at compile time, and doesn't come from the clipboard or something.

Code:

hwndCalc = CreateWindow(WC_STATIC,"",
                WS_CHILD|SS_BITMAP|WS_VISIBLE,
                rect.left+3,rect.top+23,rect.right-7,rect.bottom-27,hwndTab,NULL,
                (HINSTANCE)GetWindowLong(hwndTab,GWL_HINSTANCE),NULL);

SendMessage(hwndCalc,STM_SETIMAGE,IMAGE_BITMAP,
    (LPARAM)LoadImage(GetModuleHandle(NULL),MAKEINTRESOURCE(IDD_CALC),
    IMAGE_BITMAP,rect.right-rect.left,rect.bottom-rect.top,LR_SHARED));