Maximize of Mainframe doesn't occupy whole screen

[stakon]

Good day!

I am trying to fix an issue in a program made by someone else, so i am not familiar with all of the code.
Anyway, i hope it seems simple enough for someone experienced.

The program is using MFC and is MDI.

When the program starts it is in the maximized position by default.
Sometimes the maximized position occupies correctly the whole screen (except from the taskbar)
but sometimes it occupies less than the whole screen (about half an inch from the top is unoccupied)
Note that if the program starts correctly occupying the screen it preserves this correct state through runtime.

By using the getClientRect() of the main window i find that indeed the clientRect is less than it should when the whole screen isn't occupied.

Anyone has encountered something similar? Any guesses?

[VictorN]

Did you try to klick the "maximize" button on the mainframe system menu?

[stakon]

Yes of course!

I've done a lot of resizing/minimize/maximize both with buttons and with code i.e. ShowWindow(SW_MAXIMIZE) , but if the application started initially with wrong positioning, it keeps maximizing to this "false" position.

[GCDEF]

Is there code overriding the default WM_SHOW or WM_GETMINMAXINFO handlers?

[stakon]

No, nothing like that in the whole project...

[Ajay Vijay]

Look at the OnSize implementation. It must have some logic to resize the window.

[stakon]

The OnSize implementation indeed contains something but i think it is irrelevant.

void CMainFrame::OnSize(UINT nType, int cx, int cy)
{
CFrameWnd::OnSize(nType, cx, cy);
}

I commented the above line of code and still the positioning was wrong...

[VictorN]

What you showed us is the default OnSize implementation, so it cannot be a reason of your trouble.
How about a WM_SYSCOMMAND message handler?

[stakon]

Nothing like that in the whole project as well...

[VictorN]

Then I would suggest to consecutively remove all "non-important" things from this project, leaving only the "carcass" until the problem goes away.
If it won't go away - post this "carcass"-project to the Forum.

[GCDEF]

Nothing like that in the whole project as well...

There's got to be. Can you post the header file for the mainframe class.