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Visual Basic Programming Code Examples

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Getting the Colour Depth

Getting the Colour Depth

'API Declarations
Declare Function GetDesktopWindow Lib "User32" () As Long
Declare Function GetDC Lib "User32" _
 (ByVal hWnd As Long) As Long
Declare Function ReleaseDC Lib "User32" _
 (ByVal hWnd As Long, ByVal hDC As Long) As Long
Declare Function GetDeviceCaps Lib "GDI32" _
 (ByVal hDC As Long, ByVal nIndex As Long) As Long
'Choose this version for use in a .BAS Module.
Public Function GetColours() As Long
    
    'Define some Constants we will use.
    Const PLANES = 14
    Const BITSPIXEL = 12
    'We use the hDC of the Desktop Window.
    hDC = GetDC(GetDesktopWindow())
    'Calculate the colour depth.
    GetColours = 2 ^ (GetDeviceCaps(hDC, PLANES) * _
     GetDeviceCaps(hDC, BITSPIXEL))    
    'Clear up.
    ReleaseDC GetDesktopWindow(), hDC

End Function

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