Thread: WM_GETMINMAXINFO problem when window is maximized

I want to reduce (by 1 only pixel) the
height of a window when it is show maximized.
In my window procedure I have
the following code in C++:


case WM_GETMINMAXINFO:
LPMINMAXINFO
minmaxinfopunt = (LPMINMAXINFO) lParam;
minmaxinfopunt->ptMaxSize.y -=
1;
return 0;


Now a strange thing happen:
- with values from 1
to 16 (that is, from "minmaxinfopunt->ptMaxSize.y -= 1;" to
"minmaxinfopunt->ptMaxSize.y -= 16;") I always get the height previously
memorized in ptMaxSize.y, that is, the mazimized (by the system) height of the
window.

- with values equal or greater than 17 I get the height of the
window reduced as aspected.

I can I solve this problem?
Thanks.

Originally Posted by DeadPlanet

I thought your question was interesting so I did some research. For some reason or other the maximised size of a window on my screen is actually 8 pixels larger than my screen resolution. Your problem should be fixed by simply using the horizontal resolution of your screen instead of the value in ptMaxSize.y

Remember to also subtract the size of the taskbar. From memory I believe this is easily accomplished by GetSystemMetrics.

If a windows guru would like to step in to say why windows are created that are bigger than my screen, I would love to know!

My understanding is that Windows creates a maximised size slightly bigger than the screen to hide the (3D) borders.

As borders are generally 4 pixels wide you get a rect of -4, -4, MAX_X_RES + 4, MAX_Y_RES + 4

Y