Get exitcode from Process via arguments

Question

Im trying to start CMD process from my program that starts another process that redirect output and errors into file. And I have to have exit code of this process.

var exe = pathToExe
var output = Path.GetTempFileName();
var process = Process.Start(new ProcessStartInfo
{
     FileName = "cmd",
     Arguments = $"/c "{exe} {command} > {output} 2<&1" & echo %errorlevel% > {output})", 
     Verb = "runas",
     UseShellExecute = true,
     CreateNoWindow = true,
     WindowStyle = ProcessWindowStyle.Hidden
});
                
process.WaitForExit();
var res = File.ReadAllText(output);
Console.WriteLine(res);

Same command (cmd /c "pathToExe command > output 2<&1" & echo %errorlevel% > output) worked fine in cmd, but in this code is errorlevel always 0 (I suggest its just errorlevel of cmd process)

At this point you may ask me why am I even using cmd to start process... Well, Ive tried

using (var process = CreateProcess(processName, argumnets))
{
    var error = 0;
    var output = Path.GetTempFileName();
    process.StartInfo.UseShellExecute = true;
    process.StartInfo.Verb = "runas";   
    process.StartInfo.Arguments = $"{command} > {output} 2<&1";
    process.Start();
    process.WaitForExit();
    statusInfo = File.ReadAllText(output);
    File.Delete(output);
    if (process.ExitCode != 0)
    {
        error = process.ExitCode;
    }
    return error;
}

But it didnt work for me. Also i cant redirect outputrs programmatically because of process.StartInfo.UseShellExecute.

What _specific_ process are you trying to start? It is almost always wrong to start `cmd.exe`. — mjwills, Jan 12 '21 at 10:43
Its behing my program process, also written by me. If its wrong, so how can I have to get outpur from process started with Verb = "runas"? — Erwin Schredinger, Jan 12 '21 at 10:48
Well, I launched, there is a code of it. It didnt work for me — Erwin Schredinger, Jan 12 '21 at 10:49
You can't do `{command} > {output} 2<&1"` since the latter bit is handled by the command interpreter (cmd.exe). Please explain why you want `2<&1`. — mjwills, Jan 12 '21 at 10:50
https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.process.standardoutput?view=net-5.0 and https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.process.standarderror?view=net-5.0 is what you _should_ be using. Write them to a file in C# if you want that. — mjwills, Jan 12 '21 at 10:53
To use Process.StandardOutput and Process.StandardError I have to redirect it. I cant redirect due UseShellExecute. — Erwin Schredinger, Jan 12 '21 at 10:54
Why do you think you need `process.StartInfo.UseShellExecute` to be `true`? — mjwills, Jan 12 '21 at 10:56
Because Im starting process as admin (```Verb = "runas"```). It won't work if ```UseShellExecute = false``` — Erwin Schredinger, Jan 12 '21 at 10:57
Have you considered a manifest - https://learn.microsoft.com/en-us/previous-versions/bb756929(v=msdn.10)?redirectedfrom=MSDN / https://stackoverflow.com/a/2533065/34092 ? — mjwills, Jan 12 '21 at 11:12
[Code](https://pastebin.com/di6B9neB) Manifest: `````` When I launch this code its says that I have to upper my privilege — Erwin Schredinger, Jan 12 '21 at 11:28
System.ComponentModel.Win32Exception (0x80004005): The requested operation requires elevation at System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo) at System.Diagnostics.Process.Start() at System.Diagnostics.Process.Start(ProcessStartInfo startInfo) at test.Program.Main(String[] args) in ... — Erwin Schredinger, Jan 12 '21 at 11:33

Get exitcode from Process via arguments

0 Answers0