Capturing console output from a NET application C

Question

How do I invoke a console application from my  NET application and capture all the output generated in the console     Remember  I don t want to save the information first in a file and then relist as I would love to receive it as live

User · Accepted Answer

This can be quite easily achieved using the ProcessStartInfo RedirectStandardOutput property  A full sample is contained in the linked MSDN documentation  the only caveat is that you may have to redirect the standard error stream as well to see all output of your application   Process compiler   new Process    compiler StartInfo FileName    csc exe   compiler StartInfo Arguments     r System dll  out sample exe stdstr cs   compiler StartInfo UseShellExecute   false  compiler StartInfo RedirectStandardOutput   true  compiler Start         Console WriteLine compiler StandardOutput ReadToEnd      compiler WaitForExit

User · Answer

I made a reactive version that accepts callbacks for stdOut and StdErr  onStdOut and onStdErr are called asynchronously  as soon as data arrives  before the process exits     public static Int32 RunProcess String path                                 String args                         Action lt String gt  onStdOut   null                         Action lt String gt  onStdErr   null                var readStdOut   onStdOut    null          var readStdErr   onStdErr    null           var process   new Process                       StartInfo                                 FileName   path                  Arguments   args                  CreateNoWindow   true                  UseShellExecute   false                  RedirectStandardOutput   readStdOut                  RedirectStandardError   readStdErr                                    process Start             if  readStdOut  Task Run      gt  ReadStream process StandardOutput  onStdOut            if  readStdErr  Task Run      gt  ReadStream process StandardError  onStdErr             process WaitForExit             return process ExitCode             private static void ReadStream TextReader textReader  Action lt String gt  callback                while  true                        var line   textReader ReadLine                if  line    null                  break               callback line                       Example usage  The following will run executable with args and print    stdOut in white stdErr in red    to the console   RunProcess      executable      args      s   gt    Console ForegroundColor   ConsoleColor White  Console WriteLine s          s   gt    Console ForegroundColor   ConsoleColor Red    Console WriteLine s

User · Answer

This is bit improvement over accepted answer from  mdb  Specifically  we also capture error output of the process  Additionally  we capture these outputs through events because ReadToEnd   doesn t work if you want to capture both error and regular output  It took me while to make this work because it actually also requires BeginxxxReadLine   calls after Start     Asynchronous way   using System Diagnostics   Process process   new Process     void LaunchProcess         process EnableRaisingEvents   true      process OutputDataReceived    new System Diagnostics DataReceivedEventHandler process OutputDataReceived       process ErrorDataReceived    new System Diagnostics DataReceivedEventHandler process ErrorDataReceived       process Exited    new System EventHandler process Exited        process StartInfo FileName    some exe       process StartInfo Arguments    param1 param2       process StartInfo UseShellExecute   false      process StartInfo RedirectStandardError   true      process StartInfo RedirectStandardOutput   true       process Start        process BeginErrorReadLine        process BeginOutputReadLine                     below line is optional if we want a blocking call       process WaitForExit       void process Exited object sender  EventArgs e        Console WriteLine string Format  process exited with code  0  n   process ExitCode ToString         void process ErrorDataReceived object sender  DataReceivedEventArgs e        Console WriteLine e Data     n       void process OutputDataReceived object sender  DataReceivedEventArgs e        Console WriteLine e Data     n

User · Answer

I ve added a number of helper methods to the O2 Platform  Open Source project  which allow you easily script an interaction with another process via the console output and input  see http   code google com p o2platform source browse trunk O2 Scripts APIs Windows CmdExe CmdExeAPI cs   Also useful for you might be the API that allows the viewing of the console output of the current process  in an existing control or popup window   See this blog post for more details  http   o2platform wordpress com 2011 11 26 api consoleout-cs-inprocess-capture-of-the-console-output   this blog also contains details of how to consume the console output of new processes

User · Answer

Added process StartInfo   CreateNoWindow     true  and timeout   private static void CaptureConsoleAppOutput string exeName  string arguments  int timeoutMilliseconds  out int exitCode  out string output        using  Process process   new Process                  process StartInfo FileName   exeName          process StartInfo Arguments   arguments          process StartInfo UseShellExecute   false          process StartInfo RedirectStandardOutput   true          process StartInfo CreateNoWindow   true          process Start             output   process StandardOutput ReadToEnd             bool exited   process WaitForExit timeoutMilliseconds           if  exited                        exitCode   process ExitCode                    else                       exitCode   -1

User · Answer

Use ProcessInfo RedirectStandardOutput to redirect the output when creating your console process   Then you can use Process StandardOutput to read the program output   The second link has a sample code how to do it

User · Answer

This is bit improvement over accepted answer from  mdb  Specifically  we also capture error output of the process  Additionally  we capture these outputs through events because ReadToEnd   doesn t work if you want to capture both error and regular output  It took me while to make this work because it actually also requires BeginxxxReadLine   calls after Start     Asynchronous way   using System Diagnostics   Process process   new Process     void LaunchProcess         process EnableRaisingEvents   true      process OutputDataReceived    new System Diagnostics DataReceivedEventHandler process OutputDataReceived       process ErrorDataReceived    new System Diagnostics DataReceivedEventHandler process ErrorDataReceived       process Exited    new System EventHandler process Exited        process StartInfo FileName    some exe       process StartInfo Arguments    param1 param2       process StartInfo UseShellExecute   false      process StartInfo RedirectStandardError   true      process StartInfo RedirectStandardOutput   true       process Start        process BeginErrorReadLine        process BeginOutputReadLine                     below line is optional if we want a blocking call       process WaitForExit       void process Exited object sender  EventArgs e        Console WriteLine string Format  process exited with code  0  n   process ExitCode ToString         void process ErrorDataReceived object sender  DataReceivedEventArgs e        Console WriteLine e Data     n       void process OutputDataReceived object sender  DataReceivedEventArgs e        Console WriteLine e Data     n

User · Answer

ConsoleAppLauncher is an open source library made specifically to answer that question  It captures all the output generated in the console and provides simple interface to start and close console application    The ConsoleOutput event is fired every time when a new line is written by the console to standard error output  The lines are queued and guaranteed to follow the output order    Also available as NuGet package   Sample call to get full console output      Run simplest shell command and return its output  public static string GetWindowsVersion         return ConsoleApp Run  cmd     c ver   Output Trim        Sample with live feedback      Run ping exe asynchronously and return roundtrip times back to the caller in a callback public static void PingUrl string url  Action lt string gt  replyHandler        var regex   new Regex   time  Average       lt time gt    ms    RegexOptions Compiled       var app   new ConsoleApp  ping   url       app ConsoleOutput     o  args    gt                var match   regex Match args Line           if  match Success                        var roundtripTime   match Groups  time   Value              replyHandler roundtripTime                        app Run

User · Answer

Use ProcessInfo RedirectStandardOutput to redirect the output when creating your console process   Then you can use Process StandardOutput to read the program output   The second link has a sample code how to do it

User · Answer

I made a reactive version that accepts callbacks for stdOut and StdErr  onStdOut and onStdErr are called asynchronously  as soon as data arrives  before the process exits     public static Int32 RunProcess String path                                 String args                         Action lt String gt  onStdOut   null                         Action lt String gt  onStdErr   null                var readStdOut   onStdOut    null          var readStdErr   onStdErr    null           var process   new Process                       StartInfo                                 FileName   path                  Arguments   args                  CreateNoWindow   true                  UseShellExecute   false                  RedirectStandardOutput   readStdOut                  RedirectStandardError   readStdErr                                    process Start             if  readStdOut  Task Run      gt  ReadStream process StandardOutput  onStdOut            if  readStdErr  Task Run      gt  ReadStream process StandardError  onStdErr             process WaitForExit             return process ExitCode             private static void ReadStream TextReader textReader  Action lt String gt  callback                while  true                        var line   textReader ReadLine                if  line    null                  break               callback line                       Example usage  The following will run executable with args and print    stdOut in white stdErr in red    to the console   RunProcess      executable      args      s   gt    Console ForegroundColor   ConsoleColor White  Console WriteLine s          s   gt    Console ForegroundColor   ConsoleColor Red    Console WriteLine s

User · Answer

Added process StartInfo   CreateNoWindow     true  and timeout   private static void CaptureConsoleAppOutput string exeName  string arguments  int timeoutMilliseconds  out int exitCode  out string output        using  Process process   new Process                  process StartInfo FileName   exeName          process StartInfo Arguments   arguments          process StartInfo UseShellExecute   false          process StartInfo RedirectStandardOutput   true          process StartInfo CreateNoWindow   true          process Start             output   process StandardOutput ReadToEnd             bool exited   process WaitForExit timeoutMilliseconds           if  exited                        exitCode   process ExitCode                    else                       exitCode   -1

User · Answer

I ve added a number of helper methods to the O2 Platform  Open Source project  which allow you easily script an interaction with another process via the console output and input  see http   code google com p o2platform source browse trunk O2 Scripts APIs Windows CmdExe CmdExeAPI cs   Also useful for you might be the API that allows the viewing of the console output of the current process  in an existing control or popup window   See this blog post for more details  http   o2platform wordpress com 2011 11 26 api consoleout-cs-inprocess-capture-of-the-console-output   this blog also contains details of how to consume the console output of new processes

User · Answer

ConsoleAppLauncher is an open source library made specifically to answer that question  It captures all the output generated in the console and provides simple interface to start and close console application    The ConsoleOutput event is fired every time when a new line is written by the console to standard error output  The lines are queued and guaranteed to follow the output order    Also available as NuGet package   Sample call to get full console output      Run simplest shell command and return its output  public static string GetWindowsVersion         return ConsoleApp Run  cmd     c ver   Output Trim        Sample with live feedback      Run ping exe asynchronously and return roundtrip times back to the caller in a callback public static void PingUrl string url  Action lt string gt  replyHandler        var regex   new Regex   time  Average       lt time gt    ms    RegexOptions Compiled       var app   new ConsoleApp  ping   url       app ConsoleOutput     o  args    gt                var match   regex Match args Line           if  match Success                        var roundtripTime   match Groups  time   Value              replyHandler roundtripTime                        app Run

User · Answer

Use ProcessInfo RedirectStandardOutput to redirect the output when creating your console process   Then you can use Process StandardOutput to read the program output   The second link has a sample code how to do it

User · Answer

From PythonTR - Python Programcilari Dernegi  e-kitap    rnek   Process p   new Process         Create new object p StartInfo UseShellExecute   false      Do not use shell p StartInfo RedirectStandardOutput   true       Redirect output p StartInfo FileName    c   python26  python exe        Path of our Python compiler p StartInfo Arguments    c   python26  Hello C Python py        Path of the  py to be executed

User · Answer

Use ProcessInfo RedirectStandardOutput to redirect the output when creating your console process   Then you can use Process StandardOutput to read the program output   The second link has a sample code how to do it

User · Answer

From PythonTR - Python Programcilari Dernegi  e-kitap    rnek   Process p   new Process         Create new object p StartInfo UseShellExecute   false      Do not use shell p StartInfo RedirectStandardOutput   true       Redirect output p StartInfo FileName    c   python26  python exe        Path of our Python compiler p StartInfo Arguments    c   python26  Hello C Python py        Path of the  py to be executed

[c#] Capturing console output from a .NET application (C#)

Examples related to c#

Examples related to .net

Examples related to debugging

Examples related to console