by Anonymous (267 Submissions)
Category: Windows System Services
Compatability: Visual Basic 4.0 (32-bit)
Difficulty: Unknown Difficulty
Originally Published: Tue 2nd February 1999
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
Determine the number of colors a computer can display
API Declarations
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, ByVal hdc As Long) As Long
Private Declare Function GetDesktopWindow Lib "user32" () As Long
Private Const PHYSICALOFFSETX = 112
Private Const PHYSICALOFFSETY = 113
Private Const PLANES = 14
Private Const BITSPIXEL = 12
VBcoders
Public Function GetNColors() As Long
Dim hSrcDC As Integer
hSrcDC = GetDC(GetDesktopWindow())
GetNColors = GetDeviceCaps(hSrcDC, PLANES) * 2 ^ GetDeviceCaps(hSrcDC, BITSPIXEL)
Call ReleaseDC(GetDesktopWindow(), hSrcDC)
End Function
