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Processstartinfo c# waitforexit

Опубликовано в Vest trial | Октябрь 2, 2012

processstartinfo c# waitforexit

I have gone through similar questions at c# - ProcessStartInfo hanging on "WaitForExit"? Why? - Stack Overflow[^] but cant relate if I have. These are the top rated real world C# (CSharp) examples of fx-cryptonews.comrExit ProcessStartInfo("fx-cryptonews.com", cmd); myProcessStartInfo. WaitForExit when redirecting output. Repro_WaitForExitAsync() { var logs = new List(); var psi = new ProcessStartInfo("cmd". FOREX HEAT MAP INDICATOR For instance, I would own computers of these. February 4, failure does. Service accounts Sorry to after installation online, customers of bench's if the.

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Processstartinfo c# waitforexit StandardError; while! I don't tend to use it on network paths, but on local paths it seems to be fairly safe. Encode HTML. Introduction Currently accepted answer doesn't work throws exception and there are too many workarounds but no complete code. GetFiles ". Processstartinfo c# waitforexit makes the current thread wait until the associated process terminates.
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Sometimes we can just specify a file name. Arguments: Stores the arguments, such as -flags or filename. This is a string property. CreateNoWindow: Allows you to silently run a command line program. It does not flash a console window. WindowStyle: Use this to set windows as hidden.

Hidden is often useful. We can run any executable. But we may need to use properties on ProcessStartInfo. Here we run a program called dcm2jpg. Note: This example first creates a ProcessStartInfo. Note 2: The program we are running is called dcm2jpg. Many methods are available on the Process type. Some are instance called on the instance and others are static called on the type. Violence is not the answer—unless a process is really annoying.

It is possible to Kill or terminate a Process that we acquire a reference to. This gets an array of all the processes currently open on the System. We can loop over and test for running programs. Note: Process. GetProcesses looks at all the processes currently running.

With this method, we enumerate the active processes. Info: GetProcesses receives no arguments or one argument of the target machine name not shown. It returns a Process array. Foreach: We use a foreach-loop to access all the Processes returned by the method. We access each Process's Id. GetProcesses, usage. What are some real-world uses for the Process. GetProcesses method? We can develop a program that monitors memory usage of processes on a computer. Then: We can test memory usage, gathering and recording statistics.

This reveals memory growth over time. This method returns an array of Process objects. Its functionality can be derived by combining other methods such as GetProcesses. Here: We use Process. GetProcessesByName in a while-true loop. We use the argument "chrome" to GetProcessesByName. Name: This returns an array of all processes with name "chrome". Then, we sleep for five seconds before calling the method again.

GetProcessesByName, usage. While running the above program, I opened Chrome with several tabs. You can see that Chrome created up to five processes during this. Note: Because of its multi-process model, Chrome can run in several processes at once. Tip: Avoid the "exe" part. The method did not work when I tried using the string "chrome. With this property found on ProcessStartInfo we can redirect the standard output of Process. We can see program output within another program.

We can combine the Process. Start method with a console program that receives a parameter list. The program handles a string args array on invocation. Tip: In the Main method, we can test the string array parameter. There are some quirks to know about empty arguments. Tip 2: With Main and Process. Start, two C programs can interact with each other with no code access.

We can use this free compression utility with Process. The code is fairly simple. We can adjust command-line options to the 7-Zip executable. This type facilitates threading. Please see the tutorial with ThreadPool and progress bars. An EXE can run concurrently over more than one processor. A review. The Process type allows an external access to the operating system. With Process, we can run any EXE.

We can pass command-line arguments to these programs. This namespace makes many things possible. With Process. I tried to make a class that would solve your problem using asynchronous stream read, by taking in account Mark Byers, Rob, stevejay answers. Doing so I realised that there is a bug related to asynchronous process output stream read.

You will receive System. InvalidOperationException : StandardOut has not been redirected or the process hasn't started yet. Doing so, make a race condition because the output stream can receive data before you set it to asynchronous:. Then some people could say that you just have to read the stream before you set it to asynchronous. But the same problem occurs. There will be a race condition between the synchronous read and set the stream into asynchronous mode.

There is no way to acheive safe asynchronous read of an output stream of a process in the actual way "Process" and "ProcessStartInfo" has been designed. You are probably better using asynchronous read like suggested by other users for your case.

But you should be aware that you could miss some information due to race condition. Rob solution hangs and 'Mark Byers' solution get the disposed exception. I tried the "solutions" of the other answers. Currently accepted answer doesn't work throws exception and there are too many workarounds but no complete code.

This is obviously wasting lots of people's time because this is a popular question. Start method. I know that this is supper old but, after reading this whole page none of the solutions was working for me, although I didn't try Muhammad Rehan as the code was a little hard to follow, although I guess he was on the right track. When I say it didn't work that's not entirely true, sometimes it would work fine, I guess it is something to do with the length of the output before an EOF mark.

Anyway, the solution that worked for me was to use different threads to read the StandardOutput and StandardError and write the messages. However , it did not solve all of my issues. In our environment we have a Windows Service which is scheduled to run hundreds of different.

So i tried pretty much all of the suggestions here with different levels of success. Marko's answer was almost perfect, but when run as a service, it didnt always capture stdout. I never got to the bottom of why not. I think with async, it is possible to have a more elegant solution and not having deadlocks even when using both standardOutput and standardError:.

It is base on Mark Byers answer. The other solutions are fine for scenarios where you want to do other stuff with the output, but for simple stuff this avoids a lot of complexity. I've read many of the answers and made my own. Not sure this one will fix in any case, but it fixes in my environment. I will be glad, if someone will see possible problems with that. Or if it will help someone. For me it's better because not uses timeouts.

This post maybe outdated but i found out the main cause why it usually hang is due to stack overflow for the redirectStandardoutput or if you have redirectStandarderror. As the output data or the error data is large, it will cause a hang time as it is still processing for indefinite duration. Let us call the sample code posted here the redirector and the other program the redirected.

If it were me then I would probably write a test redirected program that can be used to duplicate the problem. So I did. The following is the important part of that. The datasize value does not match the actual file size but that does not matter. You can use any other large text file to test with.

Using that the sample redirector code hangs when I write the large amount of data but not when I write a small amount. I tried very much to somehow trace the execution of that code and I could not. 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:. Stack Overflow for Teams — Start collaborating and sharing organizational knowledge.

Create a free Team Why Teams? Learn more. Ask Question. Asked 13 years, 8 months ago. Modified 1 year ago. Viewed k times. ProcessStartInfo "TheProgram. Join " ", args ; info. Hidden; info. Start info ; p. WaitForExit ; Console. WriteLine p. Improve this question. Wai Ha Lee 8, 68 68 gold badges 59 59 silver badges 86 86 bronze badges. Epaga Epaga 37k 58 58 gold badges silver badges bronze badges. I run into same issue and this how I was able to solve it stackoverflow.

Yes, final solution: swap the last two lines. It's in the manual. ReadToEnd before p. A deadlock condition can result if the parent process calls p. WaitForExit before p. ReadToEnd and the child process writes enough text to fill the redirected stream. The parent process would wait indefinitely for the child process to exit. The child process would wait indefinitely for the parent to read from the full StandardOutput stream.

Show 1 more comment. Sorted by: Reset to default. Highest score default Date modified newest first Date created oldest first. 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. Check process. ExitCode here. Improve this answer.

Jon Schneider Mark Byers Mark Byers k gold badges silver badges bronze badges. Had no idea redirecting the output was causing the issue but sure enough it was. Spent 4 hours pounding my head on this and fixed it in 5 minutes after reading your post.

Nice work! ObjectDisposed" occurred in mscorlib. We had a similar problem as described by user above. Do you think it is possible that using statements for the event handlers need to be above the using statement for the process itself? I don't think the wait handles are needed. As per msdn, just finish off with the non-timeout version of WaitForExit: When standard output has been redirected to asynchronous event handlers, it is possible that output processing will not have completed when this method returns.

To ensure that asynchronous event handling has been completed, call the WaitForExit overload that takes no parameter after receiving a true from this overload. How do we know that a null value for e. Data indicates end of stream? I can't find that documented anywhere. Show 25 more comments.

ReadToEnd ; p. WaitForExit ;. Rob Rob I was in a similar situation. I was redirecting StandardError for no reason when converting with ffmpeg in a process, it was writting enough in the StandardError stream to create a deadlock. This still hangs for me even with redirecting and reading standard output.

Here the MSDN does not do its justice. A great article that I would recommend you to read is at: dzone. Add a comment. Out, Console. Out ; Console. WriteLine "Process Timed Out! Value : new CancellationTokenSource ; process. WhenAll tasks ; return process. WriteLine e.

For some reaon, this was the only solution that worked for me, the application stoped hangging. It seems, you doesn't handle the condition, where the process end after it started, but before the Exited event was attached. My suggestion - starting the process after all registrations. StasBoyarincev Thanks, updated. I had forgotten to update the StackOverflow answer with this change. MuhammadRehanSaeed Yet another thing - it seems not allowed call process. BeginOutputReadLine or process.

BeginErrorReadLine before process. In this case i get the error: StandardOut has not been redirected or the process hasn't started yet.

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C#: How to run external Applications using the Process Class

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C#: How to run external Applications using the Process Class

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