I was unable to do this process that you described, I have never worked with "Handle" and I am having difficulties. I did the following:

IN POWERBUILDER:

long ll_handle

ll_handle = Handle(dw_1)
il_dll.SetHandle(ll_handle)
il_dll.Start(gs_host, gs_key_application)

DLL in C#:

ls_return = process(); //Do all the process I need and return a String

SendMensageTraderSoft.SendString(ls_retorno);

/////////////////////////////////
class SendMensageTraderSoft
{
[DllImport("user32.dll")]
public static extern int SendMessage(IntPtr hWnd, uint Msg, uint wParam, int lParam);

public const int WM_USER = 0x0400 + 1;
private static IntPtr _hwnd = IntPtr.Zero;

[STAThread]
public static void SendString(string sMsg)
{
    byte[] bytes = Encoding.UTF8.GetBytes(sMsg);
    foreach (byte b in bytes)
{
    SendMessage((IntPtr)Funcoes.GetHandle(), WM_USER, 1024, b);
}

//send terminating character so receiving app knows
//to stop reading string
SendMessage((IntPtr)Funcoes.GetHandle(), WM_USER, 1024, 0);
}
}
///////////////////////////////////

in powerbuilder dw_1 > pbm_custom01

MessageBox('test', 'test').

In powerbuilder the MessageBox is not calling, the application stops responding.

Hi Gustavo,

If you don't want to use a timer your applications needs to get information about the update.

Just an idea:

- add a function (e.g. SetHandle) to your DLL that you can call from your application to inform the DLL about the handle of a window or datawindow that should receive an event (e.g. WM_USER) if something changes

- send an event to the window using the handle if the data changes

- in your application call the SetHandle function before the Start() function

- implement the event (WM_USER is event ID  pbm_custom01) in your application to update the datawindow

HTH,

René