| GetClientRect The GetClientRect function retrieves the coordinates of a window’s client area. The client coordinates specify the upper-left and lower-right corners of the client area. Because client coordinates are relative to the upper-left corner of a window’s client area, the coordinates of the upper-left corner are (0,0). | VB4-32,5,6 Declare Function GetClientRect Lib "user32" Alias "GetClientRect" (ByVal hwnd As Long, lpRect As RECT) As Long
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 | VB.NET System.Windows.Forms.Form.ClientSize
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 | Operating Systems Supported | 
 | Requires Windows NT 3.1 or later; Requires Windows 95 or later | 
 
 | · hWnd Identifies the window whose client coordinates are to be retrieved.
 
 · lpRect
 Points to a RECT structure that receives the client coordinates. The left and top members are zero. The right and bottom members contain the width and height of the window.
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 | If the function succeeds, the return value is nonzero. 
 If the function fails, the return value is zero. To get extended error information, call GetLastError.
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