How do I run a Python script from C

Question

This sort of question has been asked before in varying degrees  but I feel it has not been answered in a concise way and so I ask it again   I want to run a script in Python  Let s say it s this   if   name         main         with open sys argv 1    r   as f          s   f read       print s   Which gets a file location  reads it  then prints its contents  Not so complicated   Okay  so how do I run this in C    This is what I have now       private void run cmd string cmd  string args                ProcessStartInfo start   new ProcessStartInfo            start FileName   cmd          start Arguments   args          start UseShellExecute   false          start RedirectStandardOutput   true          using  Process process   Process Start start                         using  StreamReader reader   process StandardOutput                                string result   reader ReadToEnd                    Console Write result                                   When I pass the code py location as cmd and the filename location as args it doesn t work  I was told I should pass python exe as the cmd  and then code py filename as the args   I have been looking for a while now and can only find people suggesting to use IronPython or such  But there must be a way to call a Python script from C    Some clarification   I need to run it from C   I need to capture the output  and I can t use IronPython or anything else  Whatever hack you have will be fine   P S   The actual Python code I m running is much more complex than this  and it returns output which I need in C   and the C  code will be constantly calling the Python code   Pretend this is my code       private void get vals                 for  int i   0  i  lt  100  i                          run cmd  code py   i

User · Answer

If you re willing to use IronPython  you can execute scripts directly in C    using IronPython Hosting  using Microsoft Scripting Hosting   private static void doPython         ScriptEngine engine   Python CreateEngine        engine ExecuteFile   test py        Get IronPython here

User · Answer

Set WorkingDirectory or specify the full path of the python script in the Argument  ProcessStartInfo start   new ProcessStartInfo    start FileName    C   Python27  python exe     start WorkingDirectory     D  script   start Arguments   string Format  D   script  test py -a  0  -b  1      some param    some other param    start UseShellExecute   false  start RedirectStandardOutput   true  using  Process process   Process Start start         using  StreamReader reader   process StandardOutput                string result   reader ReadToEnd            Console Write result

User · Answer

I am having problems with stdin stout - when payload size exceeds several kilobytes it hangs  I need to call Python functions not only with some short arguments  but with a custom payload that could be big   A while ago  I wrote a virtual actor library that allows to distribute task on different machines via Redis  To call Python code  I added functionality to listen for messages from Python  process them and return results back to  NET   Here is a brief description of how it works   It works on a single machine as well  but requires a Redis instance  Redis adds some reliability guarantees - payload is stored until a worked acknowledges completion  If a worked dies  the payload is returned to a job queue and then is reprocessed by another worker

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Just also to draw your attention to this   https   code msdn microsoft com windowsdesktop C-and-Python-interprocess-171378ee  It works great

User · Answer

I ran into the same problem and Master Morality s answer didn t do it for me   The following  which is based on the previous answer  worked  private void run cmd string cmd  string args     ProcessStartInfo start   new ProcessStartInfo     start FileName   cmd   cmd is full path to python exe  start Arguments   args   args is path to  py file and any cmd line args  start UseShellExecute   false   start RedirectStandardOutput   true   using Process process   Process Start start           using StreamReader reader   process StandardOutput                  string result   reader ReadToEnd             Console Write result                As an example  cmd would be  C  Python26 python exe and args would be C   Python26  test py 100 if you wanted to execute test py with cmd line argument 100   Note that the path the  py file does not have the   symbol

User · Answer

Actually its pretty easy to make integration between Csharp  VS  and Python with IronPython  It s not that much complex    As Chris Dunaway already said in answer section I started to build this inegration for my own project  N its pretty simple   Just follow these steps N you will get your results   step 1   Open VS and create new empty ConsoleApp project   step 2   Go to tools --  NuGet Package Manager --  Package Manager Console   step 3   After this open this link in your browser and copy the NuGet Command            Link  https   www nuget org packages IronPython 2 7 9   step 4   After opening the above link copy the PM Install-Package IronPython -Version 2 7 9           command and paste it in NuGet Console in VS           It will install the supportive packages   step 5   This is my code that I have used to run a  py file stored in my Python exe           directory   using IronPython Hosting   for DLHE using Microsoft Scripting Hosting   provides scripting abilities comparable to batch files using System  using System Diagnostics  using System IO  using System Net  using System Net Sockets  class Hi   private static void Main string   args    Process process   new Process      to make a process call ScriptEngine engine   Python CreateEngine      For Engine to initiate the script engine ExecuteFile   C  Users daulmalik AppData Local Programs Python Python37 p1 py     Path of my  py file that I would like to see running in console after running my  cs file from VS   process StandardInput Flush    process StandardInput Close     to close process WaitForExit     to hold the process i e  cmd screen as output        step 6   save and execute the code

User · Answer

Execute Python script from C  Create a C  project and write the following code   using System  using System Diagnostics  using System IO  using System Threading Tasks  using System Windows Forms  namespace WindowsFormsApplication1       public partial class Form1   Form               public Form1                         InitializeComponent                       private void button1 Click object sender  EventArgs e                        run cmd                       private void run cmd                          string fileName     C  sample script py                Process p   new Process                p StartInfo   new ProcessStartInfo   C  Python27 python exe   fileName                                RedirectStandardOutput   true                  UseShellExecute   false                  CreateNoWindow   true                            p Start                 string output   p StandardOutput ReadToEnd                p WaitForExit                 Console WriteLine output                Console ReadLine                         Python sample script  print  Python C  Test   You will see the  Python C  Test  in the console of C

User · Answer

The reason it isn t working is because you have UseShellExecute   false   If you don t use the shell  you will have to supply the complete path to the python executable as FileName  and build the Arguments string to supply both your script and the file you want to read   Also note  that you can t RedirectStandardOutput unless UseShellExecute   false   I m not quite sure how the argument string should be formatted for python  but you will need something like this   private void run cmd string cmd  string args         ProcessStartInfo start   new ProcessStartInfo         start FileName    my full path to python exe        start Arguments   string Format   0   1    cmd  args        start UseShellExecute   false       start RedirectStandardOutput   true       using Process process   Process Start start                   using StreamReader reader   process StandardOutput                          string result   reader ReadToEnd                 Console Write result

[c#] How do I run a Python script from C#?

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