CODEWITHSUNDEEP
c#http-redirect
jobormo
jobormo

Reputation: 144

StandardInput problems with Process class in c#

I would like to execute a shell line using---> Process myProcess = new Process();

the line is something like: 

 pathMyProgram -options < file.txt

I have done

Process pProcess = new System.Diagnostics.Process();
pProcess.StartInfo.FileName=pathMyProgram;
pProcess.StartInfo.Arguments=-optins < file.txt

... but it doesn`t work ( due to the redirection...)

So after reading I have tried 

enter code here

Process pProcess = new System.Diagnostics.Process();
pProcess.StartInfo.FileName=pathMyProgram;
pProcess.StartInfo.Arguments=-optins 

myProcess.StartInfo.UseShellExecute = false;
myProcess.StartInfo.RedirectStandardInput = true;
pProcess.Start();
pProcess.StandardInput.WriteLine(file.txt);

and it continue without working, any help?

Upvotes: 0

Views: 386

Answers (3)

Chris Haas
Chris Haas

Reputation: 55457

Don't confuse shell redirection and the cmd.exe program. They look and act similar but are still different things. Arguments such as < and > are specific to cmd.exe If you pass these into your process they will be passed literally and you will need to parse them manually.

See the answer here, specifically EDIT 2 and 3. Also checkout Raymond Chen's blog post on it here

Upvotes: 0

Servy
Servy

Reputation: 203812

You should replace :

pProcess.StandardInput.WriteLine(file.txt);

with something like:

try
{
    pProcess.StandardInput.Write(File.ReadAllText("file.txt"));
}
finally
{
    pProcess.StandardInput.Close();
}

That's assuming you can read the entire file into memory easily. If it's a large file you'll want to read it a line at a time and pass it to the

Upvotes: 1

Ondrej Tucny
Ondrej Tucny

Reputation: 27974

Did you consider using "strings"?

pProcess.StartInfo.FileName = "pathMyProgram";
pProcess.StartInfo.Arguments = "-optins < file.txt";

Also note you will need to escape backslashes, like this:

"C:\\Path\\To\\Program.exe"

You should better read some beginners guide to C# to grasp the basics. (Unless I missed something in the meaning of your question.)

Upvotes: 0

Related Questions