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Writing to the entire screen in GDI

Posted on 2001-08-05
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Last Modified: 2012-05-04
I use the windows GDI routines (GetDC(), ...) to put grafix in a my program's window.
However, I want to write to the entire screen (full screen mode, where the only the content of the window is showing, no status bar and no window borders etc.)

I tried using GetDCEx(NULL, NULL, DCX_WINDOW) but it returns me NULL and GetLastError() returns 0.

How do I switch to full screen mode?
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Question by:mathought
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nietod earned 400 total points
ID: 6353549
Try using GetDC(NULL) instead.  That always works form me.

>> How do I switch to full screen mode?
There is no such thing.
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by:nietod
ID: 6353568
Usually if you want to draw to the full screen, you must size your window to the dimensions of the full screen.  You can do this with

int ScnWdt = GetSystemMetrics(SM_CXSCREEN);
int ScnHgt = GetSystemMetrics(SM_CYSCREEN);

MoveWindow(WindowHandle,0,0ScnWdt,ScnHgt,true);

This will move your window to fill the screen.  If you usually have borders on your window and don't want them to show when taking up the whole screen, you either need to handle WM_NCCALCSIZE to rmeove the borders when using the full screen, so your client area fills the entire window, which in turn fills the entire screen.  Or you can use AdjustWindowRect() to figure out what size window rectangle you need in order to produce a client area that fills the screen.

You also might consider wha tyou want to do when the users has multiple monitors....
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Author Comment

by:mathought
ID: 6354857
Thanks!
I should have guessed that.
Why isn't it documented?...
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LVL 22

Expert Comment

by:nietod
ID: 6355322
Why isn't what documented?   I don't know of anything in that answer that is not documented.
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