C# Signature:

[DllImport("gdi32.dll", EntryPoint="GdiAlphaBlend")]
public static extern bool AlphaBlend(IntPtr hdcDest, int nXOriginDest, int nYOriginDest,
    int nWidthDest, int nHeightDest,
    IntPtr hdcSrc, int nXOriginSrc, int nYOriginSrc, int nWidthSrc, int nHeightSrc,
    BLENDFUNCTION blendFunction);

VB Signature:

Declare Function AlphaBlend Lib "gdi32.dll" (TODO) As TODO

User-Defined Types:

BLENDFUNCTION

[StructLayout(LayoutKind.Sequential)]

public struct BLENDFUNCTION

{

    byte BlendOp;
    byte BlendFlags;
    byte SourceConstantAlpha;
    byte AlphaFormat;

    public BLENDFUNCTION(byte op, byte flags, byte alpha, byte format)
    {
    BlendOp = op;
    BlendFlags = flags;
    SourceConstantAlpha = alpha;
    AlphaFormat = format;
    }

}

//

// currentlly defined blend operation

//

const int AC_SRC_OVER = 0x00;

//

// currentlly defined alpha format

//

const int AC_SRC_ALPHA = 0x01;

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Notes:

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