I commented out the lines of the redirected program that disabled creation of a console for the redirected program to try to get a separate console window but I could not. So apparently we cannot easily have a separate console when one console program starts another console program without ShellExecute and since ShellExecute does not support redirection we must share a console, even if we specify no window for the other process. I assume that if the redirected program fills up a buffer somewhere then it must wait for the data to be read and if at that point no data is read by the redirector then it is a deadlock.
The solution is to not use ReadToEnd and to read the data while the data is being written but it is not necessary to use asynchronous reads.
The solution can be quite simple. Another possibility is to use a GUI program to do the redirection. The preceding code works in a WPF application except with obvious modifications. I was having the same issue, but the reason was different. It would however happen under Windows 8, but not under Windows 7. The following line seems to have caused the problem. I now received a Shell popup window, which is unwanted, but much better than the program waiting for nothing particular to happen.
So I added the following work-around for that:. ProcessStartInfo "TheProgram. Join " ", args ; info. Hidden; info.
Start info ; p. WaitForExit ; Console. WriteLine p. Whatever order you use, there can be a problem: If you wait for the process to exit before reading StandardOutput the process can block trying to write to it, so the process never ends. If you read from StandardOutput using ReadToEnd then your process can block if the process never closes StandardOutput for example if it never terminates, or if it is blocked writing to StandardError.
AppendLine e. Start ; process. BeginOutputReadLine ; process. BeginErrorReadLine ; if process.
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Check process. ExitCode here. ReadToEnd ; p. WaitForExit ;.
Process Extensions
FYI I had to add this caveat as an answer as I couldn't comment on his post. In such case the other parts of the condition: if process. WaitOne timeout are not executed. WaitOne timeout ; errorWaitHandle. Out, Console. Out ; Console. WriteLine "Process Timed Out! WhenAll tasks ; return process. WriteLine e. We have this issue as well or a variant. Try the following: 1 Add a timeout to p. WaitForExit nnnn ; where nnnn is in milliseconds.
Start ; p. WaitForExit ; ot. Join ; et.
SshConnection (Asakusa Framework API)
Join ; Edit: added initialization of StartInfo to code sample. Hidden; proc. StandardError; while! ReadLine ; streamWriter. Close ; proc. WaitForExit ; I redirected both input, output and error and handled reading from output and error streams. Start ; You will receive System. BeginOutputReadLine ; Doing so, make a race condition because the output stream can receive data before you set it to asynchronous: process.
None of the answers above is doing the job. ReadToEnd ; process. Usage I have used it to create progress dialog around git commands.
Quarkus - Application Initialization and Termination
IsNullOrWhiteSpace result. Set ; else stdout. Set ; else stderr. WaitForExit timeoutInMs result. ToString ; if combineStdoutAndStderr result. Timer 50 ; flushTask. TryDequeue out line sw. Enqueue process. WaitForExit int timeout.
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WriteLine File. WriteLine Command ; process. Processes are typically represented by System. Process objects. They have limited functionality, and for example provide no out-of-the-box way of gracefully closing an application. You can either kill it losing unsaved data , or close it the user can then abort the closing process. Here is a new class called AppInstance that inherits from System. So it gets all the functionality already present in the process class, yet you can add additional properties and methods:.
As you see in the example, when you instantiate new objects from your class, it launches processes, and these processes expose the same properties and methods as usual. In addition, there are new methods such as SetPriority and Close. ReTweet this Tip! Idera uses cookies to improve user experience.
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