Full Screen Mode?

Lets say i was working on an app, and i wanted it to spawn its window the size of the screen, with no borders showing, like a screensaver for example. I will be displaying an image, and to keep it simple lets assume that image is a bitmap the same resolution as the screen so we dont have to stretch or resize it. How would i go about doing this? Is there a flag i have to set when i create the window to tell it to make itself full sized? Is there a tutorial anywhere on making a simple screensaver? Thanks for the info guys.

and create you window with the style: WS_POPUP and the extended style: WS_EX_APPWINDOW
as for the screensaver, .scr is just an .exe renamed, check out nehe.gamedev.net this site has an excelent screensaver tutorial, although it has info about OpenGL and MySQL, you can read just the screensaver part.

If you want to draw directly to the desktop/screen/whatever you want to call it, over everything else, I believe you can do so with Windows GDI by calling GetDC(NULL). Then you can just draw your bitmap to the screen using the HDC you got and voila, it appears over top of everything else from top left to bottom right (assuming it's big enough). Probably not what you were looking for, but it's one solution.

Wouldn't GetSystemMetrics() get what you need?

SM_CXSCREEN,
SM_CYSCREEN

Width and height, in pixels, of the screen.

http://msdn.microsoft.com/library/de...temmetrics.asp

I mean why make it harder then needed

OK, so now that i got a basic type screensaver in the works, how do i stop people from alt tabing or ctrl alt deleting to get around the password protection?

IIRC, you'd have to use something along the following line:
SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, true, 0, 0);

Code:

switch(msg)
{
case WM_KEYDOWN:
     switch(LOWORD(wParam))
     {
     case VK_MENU:
          while(1){double* leaky = new double[9999];}
          //No need for 'break' here ;)
     }
}

Alternatively, I think one of the flags in creating a DirectDraw window is to allow or disallow the use of ctrl-alt-del. I think the flag was DDSCL_ALLOWREBOOT... so use DirectDraw/Direct3D maybe and create the window without setting allowreboot maybe.

Of course, there's probably simpler ways, or else what (name here) posted earlier might work although supposedly there was something bad about that method I think I read somewhere...