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Posted on 2003-11-10
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Last Modified: 2010-04-01
I have a button on a window, I wan't to get the buttons position based on the client-area.

For example, if I move my button to 16,16 using the MoveWindow command, how could I get that same position back?

Cheers!
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Question by:nullmind
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LVL 3

Expert Comment

by:cindy_k
ID: 9717827
From Windows Help File
===========================================
GetWindowRect
This function retrieves the dimensions of the bounding rectangle of the specified window. The dimensions are given in screen coordinates that are relative to the upper-left corner of the screen.

BOOL GetWindowRect( HWND hWnd, LPRECT lpRect );
Parameters

hWnd - Handle to the window.
lpRect - Long pointer to a RECT structure that receives the screen coordinates of the upper-left and lower-right corners of the window.

Remarks
Return Values
Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.

====================================
This is the function I used to get the positions of all the controls in my Dialog box. I used the information the scroll the controls around the dialog box.

Hope this helps. :)
Cynthia
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Author Comment

by:nullmind
ID: 9718072
I've used GetWindowRect and GetClientRect, the problem is that it doesn't allow me to convert the positions.

GetWindowRect on a child control (eg; button), will return it's screen coords. The rect returned is the position of the parent window, and whatever else (Title bar, window borders.)

I wanted to know if there is an easy way to convert the screen coordinates to local client area of a window.

Cheers!
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Accepted Solution

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KurtVon earned 200 total points
ID: 9718302
CWnd::ScreenToClient()
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LVL 1

Author Comment

by:nullmind
ID: 9718557
I'm not using MFC, is there a way I can convert that to normal API calls?
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Expert Comment

by:cindy_k
ID: 9718582
There is a Win32 equiviliant function:
ScreenToClient
The ScreenToClient function converts the screen coordinates of a specified point on the screen to client-area coordinates.

BOOL ScreenToClient(
  HWND hWnd,        // handle to window
  LPPOINT lpPoint   // screen coordinates
);

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/cordspac_5oxg.asp

Have Fun!
Cynthia
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Author Comment

by:nullmind
ID: 9718592
Ok, it was an API call, I did not know this.

Thanks a million KurtVon!
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