How can I have the ALT+TAB work correctly? I want it to minimize my OpenGL application (made using NeHe BaseCode) when in fullscreen. I need the exact code, because I''ve already read about this in other threads but nothing seems to work and no-one seems to know exactly.

You want Alt+Tab to terminate the application? Right.

Anyway, if you''re using NeHe''s basecode, just check if keys[VK_MENU] and keys[VK_TAB] are set at the same time and call PostQuitMessage(0) or exit(EXIT_FAILURE), or call your custom in-program clean-up wizard if you''re a proper coder.

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You want Alt+Tab to terminate the application? Right.

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Why would he want that?

Anyway, what exactly does your program do NOW if someone presses ALT-TAB?

Check for the WM_ACTIVATE message (look it up on msdn) and if your application gets deactivated (and you're in fullscreen mode), then minimize it with something like:
ShowWindow(window_handle, SW_MINIMIZE);

John B

[edited by - JohnBSmall on January 12, 2004 8:46:24 PM]

In you WndProc, look for the WM_ACTIVATE message.

wParam is:
WA_ACTIVE - program is activated by some method other than a mouse click (e.g. ALT-Tab)

WA_CLICKACTIVE - activated by a mouse click

WA_INACTIVE - deactivated

lParam is the handle to the window being activated or deactivated.

Do whatever you need to do to minimize your window at that point...

i think more generally you typically want to keep your game updating but don''t bother with your draw loop. so have alt-tab set a flag so you can do something like:

void Game::mainLoop(){    update();    if (!isAltTabbed)        draw();}

-mw

Now my application does what it''s supposed to do when you''re running it and press alt+tab:
it shows the start bar but the screen settings (resolution...) don''t change and my program stays on top (and you can''t send it to the background).
Instead I want it to disappear, just like any game would do when you press alt+tab.
I knew I had to use WM_ACTIVATE and WA_INACTIVE, but what code should i put there?

I think you''d need to make a ChangeDisplaySettings() to reset the previous resolution, then once WA_ACTIVE comes back in, use the same function with your stored settings. I''ll go try it in my own basecode and see how it works.

I used the ChangeDisplaySettings() function and it seems to work.
I have to check it on differet computers but let''s hope it will be OK.
Thanks to everyone.