Writing redirected output from an unmanaged executable to a windows form control

[erikash]

hi again guys, still same problem, this time i'll post my code: (the previous thread : Link m_prsAlgorithm = new Process(); m_prsAlgorithm.StartInfo.WindowStyle = ProcessWindowStyle.Hidden; m_prsAlgorithm.StartInfo.FileName = "Lottery.exe"; m_prsAlgorithm.StartInfo.UseShellExecute = false; m_prsAlgorithm.StartInfo.RedirectStandardInput = true; m_prsAlgorithm.StartInfo.RedirectStandardOutput = true; m_prsAlgorithm.OutputDataReceived += new DataReceivedEventHandler(prsAlgorithm_OutputDataReceived); m_prsAlgorithm.Start(); m_prsAlgorithm.BeginOutputReadLine(); System.IO.StreamWriter swWriter = m_prsAlgorithm.StandardInput; swWriter.WriteLine(m_strArgList + " d"); swWriter.Close(); m_prsAlgorithm.WaitForExit(); } void prsAlgorithm_OutputDataReceived(object sender, System.Diagnostics.DataReceivedEventArgs e) { this.txtOutput.Text += e.Data; //this.SetText(e.Data); } the code above couses my program to freeze (just hangs), if i uncomment the code in void prsAlgorithm_OutputDataReceived(object sender, System.Diagnostics.DataReceivedEventArgs e) and comment out the: this.txtOutput.Text += e.Data; it works but it's not thread safe and it only shows me the output when the other process has finished... any suggestions? Thanks in advance, Erik.

[led mike]

prsAlgorithm_OutputDataReceived might be executing on a different thread so you need to check and Invoke the UI thread call to transfer the data.

led mike

[erikash]

hi guys, finally i have something that works: private void RunAlgorithm() { m_prsAlgorithm = new Process(); m_prsAlgorithm.StartInfo.WindowStyle = ProcessWindowStyle.Hidden; m_prsAlgorithm.StartInfo.FileName = "Lottery.exe"; m_prsAlgorithm.StartInfo.UseShellExecute = false; m_prsAlgorithm.StartInfo.RedirectStandardInput = true; m_prsAlgorithm.StartInfo.RedirectStandardOutput = true; m_prsAlgorithm.StartInfo.CreateNoWindow = true; m_prsAlgorithm.OutputDataReceived += new DataReceivedEventHandler(prsAlgorithm_OutputDataReceived); m_prsAlgorithm.Start(); m_prsAlgorithm.BeginOutputReadLine(); System.IO.StreamWriter swWriter = m_prsAlgorithm.StandardInput; swWriter.WriteLine(m_strArgList); swWriter.Close(); m_prsAlgorithm.WaitForExit(); ProcessExitedCallback pecProcessExited = new ProcessExitedCallback(OnProcessExited); m_prsAlgorithm.WaitForExit(); btnRun.Invoke(pecProcessExited, new object[] { }); } i've inserted this into a function and called this function in a new thread (from the main thread) and it seems to work like a charm... :) does anyone know why this solved the problem? Thanks in advance, Erik.

[erikash]

ok this almost solved the problem ;) The program works perfectly if the process executed runs for a short amount of time, but if that process works a couple of minutes than it takes a pretty long time for the redirected output to show in the textbox (output in the other process is written continuously while calculating) any suggestions? Thanks in advance, Erik