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 < 100; i++)
{
run_cmd("code.py", i);
}
}
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);
}
}
}
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.
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#.
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.
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
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);
}
}
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.
had same issure and this worked for me:
using IronPython.Hosting;
var engine = Python.CreateEngine();
engine.ExecuteFile("") //put the directory of the program in the quote marks
Related
How should I restart a dotnetcore C# console app?
I have tried suggestions found for C# console apps, but doesnt work for dotnetcore.
(This is not asp.net, which is where so many dotnetcore answers point)
OK, so im going to assume in this answer that it is ok with you if your program will start a new instance of your program and then close itself.
Here we go:
Since a dotnet console app can be started from the console, I think the best way to start a new instance of your console application would be thorugh using shell commands. To run shell commands from your program, add this helper class to your application: (If you are using windows instead of mac/linux, please see the end of this post)
using System;
using System.Diagnostics;
public static class ShellHelper
{
public static string Shell(this string cmd)
{
var escapedArgs = cmd.Replace("\"", "\\\"");
var process = new Process()
{
StartInfo = new ProcessStartInfo
{
FileName = "/bin/bash",
Arguments = $"-c \"{escapedArgs}\"",
RedirectStandardOutput = true,
UseShellExecute = false,
CreateNoWindow = true,
}
};
process.Start();
string result = process.StandardOutput.ReadToEnd();
process.WaitForExit();
return result;
}
}
Then since this is a extension method, just import it and then create a string with the command to restart your app and then use the Shell() method.
So if you are in development and you normally start your app by running dotnet run then make sure you are in the proper directory and then just use this line of code "dotnet run".Shell();
If you want to get the feedback from running the command then just assign the return value like this string result = "dotnet run".Shell();
Then once you have started the new process you just exit your current program by either returning on your main method etc.
Please Note: The above code is for mac/linux, If you are on windows, then the following two lines of the above code:
FileName = "/bin/bash",
Arguments = $"-c \"{escapedArgs}\"",
Should be replaced with:
FileName = "cmd.exe",
Arguments = $"/c \"{escapedArgs}\"",
I followed this_link and I was able to run a dummy python file from my c# code like this...
public JsonResult FetchscrapyDataUrl(String website)
{
ProcessStartInfo start = new ProcessStartInfo();
start.FileName = #"C:\ProgramData\Anaconda3\python.exe";
start.Arguments = #"C:\Users\PycharmProjects\scraping_web\scrape_info\main.py";
//this is path to .py file from scrapy project
start.CreateNoWindow = false; // We don't need new window
start.UseShellExecute = false; // Do not use OS shell
//start.RedirectStandardOutput = true;// Any output, generated by application will be redirected back
start.RedirectStandardError = true; // Any error in standard output will be redirected back (for example exceptions)
Console.WriteLine("Python Starting");
start.RedirectStandardOutput = true;
using (Process process = Process.Start(start))
{
using (StreamReader reader = process.StandardOutput)
{
string stderr = process.StandardError.ReadToEnd(); // Here are the exceptions from our Python script
string result = reader.ReadToEnd(); // Here is the result of StdOut(for example: print "test")
Console.Write(result);
}
}
}
Now I know that I can run scrapy spider from a single file main.py like this...
from scrapy import cmdline
cmdline.execute("scrapy crawl text".split())
When I run main.py file from cmd in windows it works fine but it does not work when I run it from C# code .Net framework. The error is ...
"Scrapy 1.4.0 - no active project\r\n\r\nUnknown command: crawl\r\n\r\nUse \"scrapy\" to see available commands\r\n"
Any Idea how to run this...Or am i missing some path setting in windows ??
Or should I run my spider from C# in some other way??
You need to set the WorkingDirectory property
start.WorkingDirectory = #"C:\Users\PycharmProjects\scraping_web\scrape_info\"
Or you need to cd to that directory to make it work
Good day guys.
Currently, I am developing a code to execute a Teraterm macro which I had saved as a *.ttl file. The name of the file is "new.ttl" and the content is as below:
showtt 0
filedelete 'a.txt'
pause 5
:Close
closett
So, the logic is just to delete "a.txt" file, wait for 5 seconds and close Teraterm. This new.ttl works perfectly when I run it manually using Teraterm, where I load the macro in the tab control>macro. This simple .ttl file is just for some trial for me before I start to write a more complex code.
Now, I tried to launch the .ttl file using C#. The code is as below:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;
using System.Threading;
using System.Diagnostics;
namespace TeraTermConnect
{
class Program
{
static void Main(string[] args)
{
//Declare process for .ttl
Process process = new Process();
ProcessStartInfo start = new ProcessStartInfo();
//variables
string ttlpath = #"C:\TeraTermConnect\TeraTermConnect";
string ttl = "new.ttl";
string ttpHidden = #"/V";
//start the .ttl file
start.FileName = ttlpath;
start.Arguments = ttpHidden + ttl;
start.UseShellExecute = false;
//Tried a lot of thing here, not sure how to run the .ttl
Process.Start(start);
Thread.Sleep(5000);
Console.WriteLine("The process is over");
Console.WriteLine();
Console.WriteLine("Check the text file...");
Console.WriteLine();
Console.WriteLine("Hit enter to exit...");
Console.ReadKey();
}
}
}
The execution runs without any error, but, the result is not as expected. After the execution, I can see "a.txt" is still inside the mentioned path as in the code. I am not sure where I went wrong. This is just a starting step for me before I develop a more complex .ttl file and execute it through c#.
Your help is deeply appreciated. Thank you very much.
Good day guys,
After 2 days of struggle, I managed to get the answer.
using System;
using System.Windows.Forms;
using System.Threading;
using System.Diagnostics;
namespace TeraTermConnect
{
class Program
{
static void Main(string[] args)
{
//Declare process for .ttl
Process process = new Process();
ProcessStartInfo start = new ProcessStartInfo();
//variables
string ttlpath = #"C:\Program Files (x86)\teraterm\" + #"TTPMACRO";
string ttl = "new.ttl";
string ttpHidden = #"/V ";
ProcessStartInfo start = new ProcessStartInfo();
//start the .ttl file
start.FileName = ttlpath;
start.Arguments = ttpHidden + ttl;
start.UseShellExecute = false;
process.StartInfo = start;
try
{
Process.Start(start);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
Console.WriteLine("The process is over");
Console.WriteLine();
Console.WriteLine("Check the text file...");
Console.WriteLine();
Console.WriteLine("Hit enter to exit...");
Console.ReadKey();
}
}
}
The version of Teraterm that i am currently using is 4.94 and I had also installed TTLEditor version 1.5 to create the .TTL file. It seems that the problem was,
1) To execute a .TTL file programmatically from C#, I need to place the .TTL file in the same folder where TTPMACRO.EXE and TTERMPRO.EXE is located in my system. This is shown by the string value ttlpath in my code.
2) In the ttlpath, the string value #"TTPMACRO" need to be added to the folder as this will make the .TTL file to be executable.
And, for your info, in my system, the text file a.txt that will be deleted if the logic of the .TTL file is executed is located at:
C:\Users\Admin\AppData\Local\VirtualStore\Program Files (x86)\teraterm
For more info on how to run teraterm macro files, refer to this link;
https://ttssh2.osdn.jp/manual/en/macro/howtorun.html
have a nice day..
Hari
As I aksed in another post, I am trying to automate running processing ide from c#. Finally I found the way to run the processing sketch via cmd, with setting the installed processing folder in the path of evironment variable.
I find it works with inputting command directly in cmd.exe, but when I want to do the same thing through some c# code in Visual Studio, it doesn't run the .pde file.
Here is the code,
using System;
using System.Diagnostics;
namespace ConsoleApplication1
{
class Runprocessing
{
static void Main()
{
Process process = new Process();
ProcessStartInfo stinfo = new ProcessStartInfo();
stinfo.FileName = "cmd.exe";
stinfo.Arguments = "/c"+"processing-java --run --sketch=D:\\pw --output=D:\\pw\\output";
stinfo.CreateNoWindow = true;
stinfo.UseShellExecute = false;
process = Process.Start(stinfo);
process.WaitForExit();
process.Close();
process.Dispose();
}
}
}
My question is, how should I properly use processing-java to activate the sketch. because here I am stating
stinfo.FileName = "cmd.exe";
stinfo.Arguments = "/c"+"processing-java --run --sketch=D:\\pw --output=D:\\pw\\output";
Is this the right way to use processing-java in cmd?
I eventually want to be able to return a DataFrame from Python to C#. At the moment I am running a very simple console app to try and run a basic Python script. This script compiles and runs in Canopy fine however when I run it from C# I get the error relating to non-ASCII chars.
I have read many articles relating to this but none of them seem to resolve the issue I have.
Error
SyntaxError: Non-ASCII character '\x90' in file C:\Program Files\Enthought\Canop
y32\App\appdata\canopy-1.5.2.2785.win-x86\python.exe on line 1, but no encoding
declared; see http://www.python.org/peps/pep-0263.html for details
Thx in advance for any help!
static int test_python_canopy()
{
string cmd;
string args;
args = "C:\\Share\\Python\\test.py";
cmd = #"C:\Program Files\Enthought\Canopy32\App\appdata\canopy-1.5.2.2785.win-x86\python.exe";
cmd = "\"" + cmd + "\"";
ProcessStartInfo start = new ProcessStartInfo();
start.FileName = cmd;
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);
}
}
return 0;
}
For ProcessStartInfo, FileName should be set to the executable that you wish to run and Arguments should be set to the arguments that you want to pass to that executable.
In your code, FileName is set correctly to the Python interpreter. Arguments, however, the first argument is being set to Python interpreter. The net result is that C# is trying to execute this command:
C:\Program Files\Enthought\Canopy32\App\appdata\canopy-1.5.2.2785.win-x86\python.exe C:\Program Files\Enthought\Canopy32\App\appdata\canopy-1.5.2.2785.win-x86\python.exe C:\Share\Python\test.py
which means that Python is trying to use the Python executable as a script, which is not going to work. Changing the line that sets the arguments should fix the problem:
start.Arguments = args;