How to use multiple CMD commands through C#?

[bloodfire]

Hi! Currently, I have this code of trying to use CMD through C#:

Process p = new Process();
string vamppath = "set VAMP_PATH=D:";
string args = "echo %VAMP_PATH%";
p.StartInfo = new ProcessStartInfo("cmd", vamppath)
{
   RedirectStandardOutput = true,
   RedirectStandardInput = true,
   UseShellExecute = false,
   CreateNoWindow = true
};

//my alternate initialization code, but also does not work
//p.StartInfo.FileName = "cmd";
//p.StartInfo.Arguments = args;
//p.StartInfo.RedirectStandardOutput = true;
//p.StartInfo.RedirectStandardInput = true;
//p.StartInfo.UseShellExecute = false;
//p.StartInfo.CreateNoWindow = true;

p.Start();
p.StandardInput.WriteLine(vamppath);
string output = p.StandardOutput.ReadToEnd();
Console.WriteLine("Setting VAMP_PATH: " + output);
p.WaitForExit();
p.StandardInput.WriteLine(args);
output = p.StandardOutput.ReadToEnd();
p.WaitForExit();
Console.WriteLine("Get VAMP_PATH: " + output);

I just do a simple set and get of a particular environment variable. When I do it manually in CMD it works properly. But when I execute the following commands using C# it does not.

What could be the problem? Thanks!

[Omegadarkest]

I think you are looking for something more along the lines of

ProcessStartInfo proc = new ProcessStartInfo();
proc.FileName = "set";
proc.Arguments = "VAMP_PATH=D:";

This will issue 'set VAMP_PATH=D:' to the command line you do not need to call cmd.

Also since you were trying to call cmd and using WaitForExit you will be stuck in a loop until you actual exit the command window.

If your app is sending multiple items to command you can just create 1 usable method to use.

private void SendToCMD(string cmd, string args)
{
ProcessStartInfo proc = new ProcessStartInfo();
proc.FileName = cmd;
proc.Arguments = args
...etc
...etc
}

[bloodfire]

Hi!

I get an error when I remove the 'cmd.exe' regarding the filename. Something about there is no filename specified when I try to start the process.

[Omegadarkest]

Sorry it was like 1am since you are using c# why don't you just use.

System.Environment.SetEnvironmentVariable
System.Environment.GetEnvironmentVariable

as the other method you can use

p.StartInfo.FileName = "cmd";
p.StartInfo.Arguments = "set VAMP_PATH=D:";

If you want a permanent variable use setx

setx VAMP_PATH D:

[bloodfire]

Hi!

Hey great! That works! I didnt know about the EnviromentVariable since Im pretty new.

Anyway, thank you very much again!