C# Signature:

[DllImport("coredll.dll")]

extern public static Int32 AlphaBlend(IntPtr hdcDest, Int32 xDest, Int32 yDest, Int32 cxDest, Int32 cyDest, IntPtr hdcSrc, Int32 xSrc, Int32 ySrc, Int32 cxSrc, Int32 cySrc, BlendFunction blendFunction);

VB Signature:

Public Declare Function AlphaBlend Lib "coredll" (ByVal hdcDest As IntPtr, ByVal xDest As Int32, ByVal yDest As Int32, ByVal cxDest As Int32, ByVal cyDest As Int32, ByVal hdcSrc As IntPtr, ByVal xSrc As Int32, ByVal ySrc As Int32, ByVal cxSrc As Int32, ByVal cySrc As Int32, ByVal blendFunction As BlendFunction) As Integer

User-Defined Types:

VB

    Public Structure BlendFunction
        Public BlendOp As Byte
        Public BlendFlags As Byte
        Public SourceConstantAlpha As Byte
        Public AlphaFormat As Byte
    End Structure

C#

    public struct BlendFunction
    {
        public byte BlendOp;
        public byte BlendFlags;
        public byte SourceConstantAlpha;
        public byte AlphaFormat;
    }

Alternative Managed API:

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Notes:

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Sample Code:

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