Problem calling a C++ program from C#

Question

I have a C++ program (Test.exe) that takes in a number N (passed as command line argument) and generates coordinates for N rectangles written to a text file.

I have tested this via the command line and in Visual Studio, and on both occasions the file is written with the expected output.

In a C# program I enter N in a textbox, click a button and my event code is as follows:

Process p = new Process();
p.StartInfo.FileName = "Test.exe";
p.StartInfo.Arguments = num;
p.Start();
// read the file that Test.exe created

A file is not written by Test.exe.

Any suggestions as to why Test.exe doesn't write the file when it is called from the C# program?

Problem Found The file was being written in the directory where the C# program was executed from NOT from where the C++ program was located.

fardjad · Accepted Answer · 2011-09-23 17:28:22Z

2

I guess you forgot p.WaitForExit() right after the p.Start() line.

answered Sep 23, 2011 at 17:28

fardjad

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2 Comments

Hans Passant Over a year ago

StartInfo.WorkingDirectory would be an excellent candidate as well. The default is rarely writable.

Kameel Gopal Over a year ago

Even with using p.WaitForExit(), the file is not written

Dave M · Accepted Answer · 2011-12-27 13:44:46Z

2

Two points:

Make sure the working directory of Test.exe (StartInfo.WorkingDirectory) is set to a directory where the process has write access, and
If Test.exe needs process elevation, use StartInfo.UseShellExecute = true and StartInfo.Verb = "runas" to start an elevated process. Your C# program needs to be an elevated process to do this, you can use an application manifest file for this.

edited Dec 27, 2011 at 13:44

Dave M

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answered Sep 23, 2011 at 18:26

Michael

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