by Buddhika Fernando. (6 Submissions)
Category: Windows API Call/Explanation
Compatability: Visual Basic 5.0
Difficulty: Unknown Difficulty
Originally Published: Sun 3rd September 2006
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
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API Declarations
Public Const GWL_EXSTYLE As Long = -20
Public Const WS_EX_LAYERED As Long = &H80000
Public Const LWA_ALPHA As Long = &H2
Public Declare Function GetWindowLong Lib "user32.dll" Alias "GetWindowLongA" ( _
ByVal hwnd As Long, _
ByVal nIndex As Long) As Long
Public Declare Function SetLayeredWindowAttributes Lib "user32.dll" ( _
ByVal hwnd As Long, _
ByVal crKey As Long, _
ByVal bAlpha As Byte, _
ByVal dwFlags As Long) As Long
Public Declare Function SetWindowLong Lib "user32.dll" Alias "SetWindowLongA" ( _
ByVal hwnd As Long, _
ByVal nIndex As Long, _
ByVal dwNewLong As Long) As Long
Public Declare Function SetParent Lib "user32.dll" ( _
ByVal hWndChild As Long, _
ByVal hWndNewParent As Long) As Long
VBcoders
On Error Resume Next
Dim Attrib As Long
Attrib = GetWindowLong(OB_Hwnd, GWL_EXSTYLE)
SetWindowLong OB_Hwnd, GWL_EXSTYLE, Attrib Or WS_EX_LAYERED
SetLayeredWindowAttributes OB_Hwnd, RGB(0, 0, 0), OB_Val, LWA_ALPHA
FTransVal = OB_Val
Exit Sub
End Sub