Hi everybody,
I have just installed the Cygwin environment with Cygwin DLL release version
1.7.1-1.
My goal is to call a Cygwin compiled C program from a C# program written in
Visual studio 2008 and read an environment variable from the Windows
environment in the C program.
Unfortunately my C program is not able to read the environment variable set
in the C# program.
For the purpose of elimination here are some facts:
1) If I replace the C program for a windows .bat file and call this .bat
file from the C# program it returns the environment variable.
2) Calling the C program directly in a dos box, results in the fact that it
can read an environment variable.
3) In previous versions of cygwin, this worked correctly, although I am not
sure with which version of the Cygwin DLL release.
Has anybody seen this rather strange behaviour before ?
Any help is greatly appreciated.
Warm regards,
Jan
This is my C program:
==== BEGIN C CODE ====
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <stdbool.h>
main()
{
printf("%s\n", getenv("CYGWIN"));
}
==== END C CODE ====
And this is my C# code:
==== BEGIN C# CODE ====
private void button1_Click(object sender, EventArgs e)
{
Process p = new Process();
p.StartInfo.CreateNoWindow = true;
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardInput = true;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.RedirectStandardError = true;
p.StartInfo.FileName = @"D:\Test\bin\jan.exe";
p.StartInfo.EnvironmentVariables["CYGWIN"] = "nodosfilewarning";
p.OutputDataReceived += new
DataReceivedEventHandler(StdOutputHandler);
p.ErrorDataReceived += new
DataReceivedEventHandler(StdOutputHandler);
p.Start();
p.StandardInput.AutoFlush = true;
p.BeginOutputReadLine();
p.BeginErrorReadLine();
p.WaitForExit();
p.Close();
}
private void StdOutputHandler(object sendingProcess,
DataReceivedEventArgs Entry)
{
MessageBox.Show(Entry.Data);
}
==== END C# CODE ====
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