cannot start a Process and access standardInput

  • Thread starter Thread starter Juan Gabriel Del Cid
  • Start date Start date
J

Juan Gabriel Del Cid

Process.Start(StartInfo); //line 12
R_Input = Rprocess.StandardInput; //ine 13

I can see the process start correctly after line 12 (it appears
in the Windows Task Manager, and a console starts up).
But line 13 always raises the exception:
"StandardIn has not been redirected."
Click to expand...

Um... in line 12 you get the actual process that was created. Store that
reference in Rprocess. In other words, change line 12 to:

Rprocess = Process.Start(StartInfo);

That should work,
-JG
 
I looked at
http://www.codeproject.com/csharp/LaunchProcess.asp?target=process and
tried to follow the code there. My code is:

public class Test
{
public ProcessStartInfo StartInfo;
public StreamWriter R_Input;
public StreamReader R_Output;
public Process Rprocess = new Process();

public Test()
{
}

public void StartR()
{
StartInfo = new ProcessStartInfo(
@"C:/Program Files/R/rw1062/bin/Rterm.exe",
@"--no-restore --no-save");

StartInfo.RedirectStandardInput = true;
StartInfo.RedirectStandardOutput = true;
StartInfo.UseShellExecute = false;
StartInfo.CreateNoWindow = false;


Process.Start(StartInfo); //line 12

R_Input = Rprocess.StandardInput; //ine 13
}
}

I can see the process start correctly after line 12 (it appears in the
Windows Task Manager, and a console starts up). But line 13 always raises
the exception:
"StandardIn has not been redirected."

I don't know much about the program Rterm.exe itself
(http://www.r-project.org/), but the documentation would imply no problem in
redirecting stdIn and stdOut in a .bat file:

"Otherwise you can set up a batch file using Rterm.exe. A sample batch file
might contain (as one line)

path_to_R\bin\Rterm.exe --no-restore --no-save < %1 > %1.out 2>&1"
Can someone suggest a cause and a fix for this problem?
 
Back
Top