How can I run a console application in C#, passing parameters to it, and get the result of the application in Unicode? Console.WriteLine is used in the console application.
Important point is write Unicode in Console Application.
Sample from MSDN
// Start the child process.
Process p = new Process();
// Redirect the output stream of the child process.
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.FileName = "Write500Lines.exe";
p.Start();
// Do not wait for the child process to exit before
// reading to the end of its redirected stream.
// p.WaitForExit();
// Read the output stream first and then wait.
string output = p.StandardOutput.ReadToEnd();
p.WaitForExit();
try with below code, here "Amay" is a argument.
System.Diagnostics.ProcessStartInfo info = new System.Diagnostics.ProcessStartInfo(#"E:\\ConsoleApplicationt\bin\Debug\ConsoleApplicationt.exe", "Amay");
System.Diagnostics.Process p = System.Diagnostics.Process.Start(info);
Check out Process.Start():
MSDN - Process.Start Method
Your code will probably look something like:
var process = Process.Start(pathToProgram, argsString);
process.WaitForExit();
var exitCode = process.ExitCode;
If by "result of the console application" you mean any output of the program to the console while it runs...you'll need to look at the documentation and figure out how to redirect the output of the program from the console to another stream.
Here http://www.aspcode.net/ProcessStart-and-redirect-standard-output.aspx You can see how to read the output from the console app You start with Process.Start().
Take a look at the Process class. You can call any executable using Process.Start("myexe.exe");
You should be careful depending upon your use some of the other examples can have issues. For common mistakes made writing your own code, read "How to use System.Diagnostics.Process correctly"
For a library to use, there is one here: http://csharptest.net/browse/src/Library/Processes
with a brief usage guide: "Using the ProcessRunner class"
Related
I have a C# Console application which I am trying to execute from another WinForm application just like batch runner by giving the console application's .exe file like below.
Process.Start("Path of Console application exe to execute")
However I need to wait and handle the output and display the output in WinForm's richtextbox from console application once it has completed the execution. How can I achieve this?
Update
I have changed the code to Start a Process and Read using StandardOutput and BeginOutputReadLine() to Read the output asynchronously, but not able to see output in console window, instead console window is getting closed. Not sure how to solve this.
p.StartInfo.UseShellExecute = false;
// p.StartInfo.CreateNoWindow = True
p.StartInfo.RedirectStandardOutput = true;
string #out = null;
p.StartInfo.RedirectStandardError = true;
p.OutputDataReceived += new DataReceivedEventHandler((sender, e) =>
{
#out += e.Data;
});
p.StartInfo.FileName = currentTest;
p.Start();
p.BeginOutputReadLine();
// string output = p.StandardError.ReadToEnd();
// p.WaitForExit()
while (!p.HasExited)
Application.DoEvents();
//Console.WriteLine($#"Output \n'{output.Substring(output.Length - 50)}'");
Console.WriteLine($#"\n Error stream: {#out}");
Console.ReadLine();
You need to redirect stdout (and probably stderr) so that any output comes to you, instead of a console; you may also want to redirect stdin. All of these things are available via ProcessStartInfo, with an example on MSDN. Note that if you want to display updates while the exe is running, you may need a worker thread to read incrementally from StandardOutput and StandardError, rather than ReadToEnd() - which won't return anything at all until the associated output pipe is closed.
However! If the console exe is "yours", it may be simpler to just expose the functionality you want in a library, and invoke it directly in-process. There are times when out-of-process is actively preferred, such as when you need to allow that process to go catastrophically wrong in some scenarios - but usually in-process is preferable, given free rein.
From the MSDN example of using stdoutput of newly created process:
// This is the code for the base process
Process myProcess = new Process();
// Start a new instance of this program but specify the 'spawned' version.
ProcessStartInfo myProcessStartInfo = new ProcessStartInfo(args[0], "spawn");
myProcessStartInfo.UseShellExecute = false;
myProcessStartInfo.RedirectStandardOutput = true;
myProcess.StartInfo = myProcessStartInfo;
myProcess.Start();
StreamReader myStreamReader = myProcess.StandardOutput;
// Read the standard output of the spawned process.
string myString = myStreamReader.ReadLine();
Console.WriteLine(myString);
myProcess.WaitForExit();
myProcess.Close();
If instead of myStreamReader.ReadLine() I'm using myStreamReader.ReadToEnd() shall I still use myProcess.WaitForExit()?
Or ReadToEnd() will wait until the process is finished?
EDIT:
Sorry for the diversion, to directly answer your question. Yes, you need to call Process.WaitForExit();. This will ensure that the process has yielded all its output before you call ReadToEnd()
ReadToEnd is synchronous function. Hence if you don't call it in your code, it will block your main thread until it captures only the first output from the StandardOutput, then that's it. But using WaitForExit will ensure that you have everything.
Also you might consider doing an asynchronous read of the process's output, see this MSDN Example that implements OutputDataRecieved
"ReadToEnd" is a function stored in "StreamReader" object and I don't think it has something to do with waiting for a process to exit, however the "Process" class might handle that itself. By the way, all the abilities "StreamReader" has are not useful in the situation you mentioned.
In my point of view, "WaitForExit" should be called and as you did "Close" too. Because they will release some system resources that no method else can. As far as I know, "ReadToEnd" method has nothing to do with calling those two.
Cheers
How execute command via shell and return the complete output as a string using C#?
equivalent to shell_exec() of PHP.
Thanks,advanced.
The MSDN documentation on Process.StandardOutput documentation shows an example
// Start the child process.
Process p = new Process();
// Redirect the output stream of the child process.
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.FileName = "Write500Lines.exe";
p.Start();
// Do not wait for the child process to exit before
// reading to the end of its redirected stream.
// p.WaitForExit();
// Read the output stream first and then wait.
string output = p.StandardOutput.ReadToEnd();
p.WaitForExit();
You might like to extract the standard error stream as well.
Use the Process class
Look at the Process class Standard Output and Standard Error, and the OutputDataReceived and
ErrorDataReceived recieved events.
There is a CodeProject article here, which you may find helpful.
I have a .Net application that needs to run several executables. I'm using the Process class, but Process.Start doesn't block. I need the first process to finish before the second runs. How can I do this?
Also, I'd like all of the processes to all output to the same console window. As it is, they seem to open their own windows. I'm sure I can use the StandardOutput stream to write to the console, but how can I suppress the default output?
I believe you're looking for:
Process p = Process.Start("myapp.exe");
p.WaitForExit();
For output:
StreamReader stdOut = p.StandardOutput;
Then you use it like any stream reader.
To suppress the window it's a bit harder:
ProcessStartInfo pi = new ProcessStartInfo("myapp.exe");
pi.CreateNoWindow = true;
pi.UseShellExecute = true;
// Also, for the std in/out you have to start it this way too to override:
pi.RedirectStandardOutput = true; // Will enable .StandardOutput
Process p = Process.Start(pi);
I'm trying to use the System.Diagnostics.Process class to run a Perl script from within an ASP.NET application. The Perl command runs fine when I type it into the command line, but when ASP.NET tries to run the same command it doesn't work.
I suspect it may have to do with input and output stream. The Perl script takes a long time to run to completion on the command line. But in .NET the command returns almost immediately, and when I try to redirect Perl script's standard output to see what messages are yielded it shows just the first line and returns. Using blocking stream reading techniques doesn't fix this; .NET really thinks that the Perl script is outputting just one line, then finishes.
Any suggestions? As much as I would like to, the script can't be rewritten in .NET. Here's the code I'm using to launch the process. I've tried changing ReadToEnd() to a series of ReadLine() calls, but after the first call returns the first line of output the next call returns null.
Process proc = new Process();
proc.StartInfo.FileName = scriptPath;
proc.StartInfo.Arguments = arguments;
proc.StartInfo.RedirectStandardOutput = true;
proc.StartInfo.UseShellExecute = false;
proc.Start();
string output = proc.StandardOutput.ReadToEnd(); // Returns only the first line
proc.WaitForExit();
Switch the 2 last lines:
lineproc.WaitForExit();
string output = proc.StandardOutput.ReadToEnd(); // Returns only the first
or build a loop that keeps reading from proc.StandardOutput until the script has finished.