sendmessage by WM_COPYDATA

[snsk...@163.com]

I want to know how to use the WM_COPYDATA property, in the sendMessage function 

      Wnd wnd = new Wnd(527750);

       Function sendMessage = User32.getInstance().getFunction(FUNCTION_SEND_MESSAGE.toString());   

        sendMessage.invoke(result,

                wnd,

                new UInt(Msg.WM_COPYDATA),

                new IntPtr(0),

              ??????  //what should I replace here?

          );

Pascal example :

   procedure TForm17.Button1Click(Sender: TObject);

    var

       s: String;

       SendData: tagCOPYDATASTRUCT;

     begin

     s := Edit2.Text;

   with SendData do

   begin

      cbData := length(s) * sizeof(char) + 2;

      GetMem(lpData, cbData);

      StrCopy(lpData, PChar(s));

  end;

  sendMessage(strtoint(Edit1.Text), WM_COPYDATA, 0, integer(@SendData));

  FreeMem(SendData.lpData);

end;

[Sergei Piletsky]

According to MSDN documentation for WM_COPYDATA message, lParam parameter should be a pointer to COPYDATASTRUCT structure. So, in order to pass such parameter to the SendMessage function, you can use the following construction:

new Pointer(new CopyDataStruct());

Here CopyDataStruct is the wrapper for COPYDATASTRUCT structure and it can be defined as following:

public class CopyDataStruct extends Structure {
    private Pointer.Void dwData = new Pointer.Void();
    private UInt32 cbData = new UInt32();
    private Pointer.Void lpData = new Pointer.Void();

    public CopyDataStruct() {
        init(new Parameter[]{dwData, cbData, lpData});
    }

    public Pointer.Void getDwData() {
        return dwData;
    }

    public UInt32 getCbData() {
        return cbData;
    }

    public Pointer.Void getLpData() {
        return lpData;
    }
}

-Serge

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