Re: Quick: Center CHOOSECOLOR Dialog

"John Carson" <>
Wed, 14 Jun 2006 02:55:03 +1000
"DHarray" <> wrote in message


How to center a common dialog on the screen (c++, non mfc)? It's a
"choose color" dialog from the common dialogs of windows.

I can't find any parameter which do this.


You can have a "hook" window procedure that centers the dialog when it
processes WM_INITDIALOG.

1. Add CC_ENABLEHOOK to the Flags field of the CHOOSECOLOR structure.

2. Define a window procedure like:

    UINT message,
    WPARAM wParam,
    LPARAM lParam
     if(message == WM_INITDIALOG)
          RECT workspaceRect, windowRect;
          int leftedge, topedge;

          GetWindowRect(hdlg, &windowRect);
          SystemParametersInfo(SPI_GETWORKAREA, 0, &workspaceRect, 0);
          leftedge = ((workspaceRect.right - workspaceRect.left)
                                 - (windowRect.right - windowRect.left))/2;
          topedge = ((workspaceRect.bottom -
                                 - (windowRect.bottom -;

          SetWindowPos(hdlg, 0, leftedge, topedge, 0, 0,
                                        SWP_NOSIZE | SWP_NOZORDER);

          return TRUE;
     return FALSE;

3. Set the lpfnHook field of the CHOOSECOLOR structure to equal CCHookProc.

John Carson

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