Ｃ＃コード断片/共通/WM_COPYDATAを受ける

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[StructLayout(LayoutKind.Sequential)]
private struct COPYDATASTRUCT {
    public IntPtr dwData;
    public int cbData;
    public IntPtr lpData;
}
private const int WM_COPYDATA = 0x4A;
 
protected override void WndProc(ref Message m) {
    if(m.Msg==WM_COPYDATA){
        COPYDATASTRUCT cds = new COPYDATASTRUCT();
         cds = (COPYDATASTRUCT) Marshal.PtrToStructure(m.LParam, typeof(COPYDATASTRUCT));
        if (cds.cbData > 0) {
            byte[] data = new byte[cds.cbData];            
             Marshal.Copy(cds.lpData, data, 0, cds.cbData);
             //あとは data に COPYDATA の内容が入ってるので適宜処理
        }
        m.Result=(IntPtr)1;
    }
    base.WndProc (ref m);
}