Are there any easy methods to...

James T Johnson

Not that I know of, you can use the same technique you use in GDI though. BTW, congrats on having post #100 :) James Simplicity Rules!

Nish Nishant

James T. Johnson wrote: Not that I know of, you can use the same technique you use in GDI though As if I know how to do that with GDI :-) James T. Johnson wrote: BTW, congrats on having post #100 I guess no one would believe me if I said that it was entirely accidental :( Nish

Check out last week's Code Project posting stats presentation from :- http://www.busterboy.org/codeproject/ Feel free to make your comments.

Rama Krishna Vavilala

incidentally I spend two hours today in order to find that. I also wanted to know how to set XOR mode in drawing. Unfortunately it looks like that we have to rely on P/Invoke

Nish Nishant

Rama Krishna wrote: Unfortunately it looks like that we have to rely on P/Invoke No! Not P/Invoke. We can always use IJW if we are using MC++ Nish

Check out last week's Code Project posting stats presentation from :- http://www.busterboy.org/codeproject/ Feel free to make your comments.

James T Johnson

XOR isn't supported under GDI+, from what I can infer it was because XOR was used as a hack because of speed/memory constraints and the proper way now is to ensure that what you are drawing is visible (grey's around the 128 area don't show up well at all when black is xor'd on it). James Simplicity Rules!

James T Johnson

Nish [BusterBoy] wrote: As if I know how to do that with GDI Ask (ok imply) and ye shall receive :) Courtesy of MSDN

// Create a normal DC and a memory DC for the entire screen. The
// normal DC provides a "snapshot" of the screen contents. The
// memory DC keeps a copy of this "snapshot" in the associated
// bitmap.

hdcScreen = CreateDC("DISPLAY", NULL, NULL, NULL);
hdcCompatible = CreateCompatibleDC(hdcScreen);

// Create a compatible bitmap for hdcScreen.

hbmScreen = CreateCompatibleBitmap(hdcScreen,
GetDeviceCaps(hdcScreen, HORZRES),
GetDeviceCaps(hdcScreen, VERTRES));

if (hbmScreen == 0)
errhandler("hbmScreen", hwnd);

// Select the bitmaps into the compatible DC.

if (!SelectObject(hdcCompatible, hbmScreen))
errhandler("Compatible Bitmap Selection", hwnd);

// Hide the application window.

ShowWindow(hwnd, SW_HIDE);

//Copy color data for the entire display into a
//bitmap that is selected into a compatible DC.

if (!BitBlt(hdcCompatible,
0,0,
bmp.bmWidth, bmp.bmHeight,
hdcScreen,
0,0,
SRCCOPY))

    errhandler("Screen to Compat Blt Failed", hwnd);

// Redraw the application window.

ShowWindow(hwnd, SW_SHOW);

James Simplicity Rules! [Edit: You obviously won't need the calls to ShowWindow, you can just call Show and Hide on the form :)]

Nish Nishant

James T. Johnson wrote: Copy color data for the entire display into a bitmap that is selected into a compatible DC. Bit confusing there. What's a bitmap object. Later I see that it is an object because you use two members, bmWidth and bmHeight. And how do I select it into a compatible DC? Nish

Check out last week's Code Project posting stats presentation from :- http://www.busterboy.org/codeproject/ Feel free to make your comments.

James T Johnson

:-D I don't know, like i said it was just a copy/paste of code in MSDN, I suppose you could replace bmp.bmWidth with GetDeviceCaps(hdcScreen, HORZRES); and bmp.bmHeight with GetDeviceCaps(hdcScreen, VERTRES); James Simplicity Rules!

Christian Graus

Are you using MFC ? If you are, it's a lot simpler than this SDK sample makes it look. Christian The tragedy of cyberspace - that so much can travel so far, and yet mean so little. And you don't spend much time with the opposite sex working day and night, unless the pizza delivery person happens to be young, cute, single and female. I can assure you, I've consumed more than a programmer's allotment of pizza, and these conditions have never aligned. - Christopher Duncan - 18/04/2002

Neil Van Note

bmWidth, and bmHeight are the members of a BITMAP structure defined in WIN32. You can obtain this structre by calling GetObject for the WIN32 bitmap handle (HBITMAP). Regards

Neil Van Note

HDC hDC = GetDC(NULL);
HDC hMemDC = CreateCompatibleDC(hDC);

SIZE size = { GetSystemMetrics(SM\_CXSCREEN), GetSystemMetrics(SM\_CYSCREEN) };
HBITMAP hBitmap = CreateCompatibleBitmap(hDC, size.cx, size.cy);

if (hBitmap)
{
	HBITMAP hOld = (HBITMAP) SelectObject(hMemDC, hBitmap);
	BitBlt(hMemDC, 0, 0, size.cx, size.cy, hDC, 0, 0, SRCCOPY);
	SelectObject(hMemDC, hOld);

	Bitmap \*pBitmap = Bitmap::FromHbitmap(hBitmap);
	DeleteDC(hMemDC);
	ReleaseDC(NULL, hDC);

	if (pBitmap)
	{
		pBitmap->Save("./test.bmp");
		pBitmap->Dispose();
		pBitmap = 0;
	}

	DeleteObject(hBitmap);
}

Nish Nishant

Thanks! Is Bitmap a non-MFC GDI class? Nish

The posting stats are now in PDF:- http://www.busterboy.org/codeproject/ Feel free to make your comments. Updated - May 04th, Saturday

Neil Van Note

Bitmap is a managed class in System.Drawing...