Develop Reference

Not possible to set input file in linux command running from .NET Core

I'm running .NET Core app on the linux docker container
When I call the command from the linux terminal it works well:
./darknet detector test -out result.json < data/file-list.txt
But when I start the process from the .NET Core I see error. Process runner method:
public static string RunCommand(string command, string args)
{
var process = new Process()
{
StartInfo = new ProcessStartInfo
{
FileName = command,
Arguments = args,
RedirectStandardOutput = true,
RedirectStandardError = true,
UseShellExecute = false,
CreateNoWindow = true
}
};
process.Start();
process.WaitForExit();
string output = process.StandardOutput.ReadToEnd();
string error = process.StandardError.ReadToEnd();
return #$"{output}{Environment.NewLine}-------------------------------{Environment.NewLine}{error}";
}
Calling code:
string args = #$"detector test -out result.json < data/file-list.txt";
string output = ProcessRunner.RunCommand("./darknet", args);
Here is the part of the output:
Cannot load image "<"
STB Reason: can't fopen
How to fix it?

You can write the process's standard input once you set the RedirectStandartInput to true while starting your process. Here is an example how to write :
var process = new Process()
{
StartInfo = new ProcessStartInfo
{
FileName = "./ConsoleApp1.exe",
RedirectStandardOutput = true,
RedirectStandardError = true,
RedirectStandardInput = true, // here you need
UseShellExecute = false,
CreateNoWindow = true,
}
};
process.Start();
using var file = File.OpenRead("./1.txt");
using var reader = new StreamReader(file);
while (true)
{
var line = await reader.ReadLineAsync();
if (string.IsNullOrWhiteSpace(line)) break; // you can use some other stoping decision
await process.StandardInput.WriteLineAsync(line);
}

How to pass password StandardInput to pg_dump?

I'm creating Process to run pg_dump.exe in C#
var processStartInfo = new ProcessStartInfo
{
Arguments = #"-U postgres -W -f D:\postgres\test123_dump.sql postgres",
CreateNoWindow = true,
FileName = #"C:\PostgreSQL\bin\pg_dump.exe",
UseShellExecute = false,
WindowStyle = ProcessWindowStyle.Hidden,
RedirectStandardInput = true
};
Process process = new Process() { StartInfo = processStartInfo, EnableRaisingEvents = true };
process.Start();
using( StreamWriter sw = process.StandardInput)
{
sw.WriteLine("123"); // test password
};
It will run pg_dump.exe, it will show prompt to pass the password, but StreamWriter seems to not work for some reason.

You could use this string to put your authentication info directly in argument list
var processStartInfo = new ProcessStartInfo
{
Arguments = #"--dbname=postgresql://user_name:pass_word#Localhost:5432/bd_name_to_save -F c -b -f output_bd_name",
CreateNoWindow = true,
FileName = #"C:\PostgreSQL\bin\pg_dump.exe",
UseShellExecute = false,
WindowStyle = ProcessWindowStyle.Hidden,
RedirectStandardInput = true
};
Process process = new Process() { StartInfo = processStartInfo, EnableRaisingEvents = true };
process.Start();

C# How to run exe in PowerShell

I want to run mc.exe using by PowerShell as I write below.
How can I do that? I tried to add in Filename but it doesn't work.
var mcExe = #"C:\Users\developer\Desktop\Example\mc.exe ";
var proc = new System.Diagnostics.Process();
proc.StartInfo.FileName = mcExe;
proc.StartInfo.UseShellExecute = false;
proc.StartInfo.Verb = "runas";
proc.StartInfo.Arguments = String.Format("{0}{1}{2}", "./mc alias set myCloud http://localhost:9000", "admin", "123456");
proc.Start();

Did you try set proc.StartInfo.UseShellExecute = true; ?
Because this property responsible for using powershell

Starting Powershell directly might work for you, e.g. :
using System.Diagnostics;
ProcessStartInfo startInfo = new ProcessStartInfo
{
FileName = #"powershell.exe",
Arguments = #"& 'C:\Users\developer\Desktop\Example\mc.exe' #('./mc alias set myCloud http://localhost:9000', 'admin', '123456')",
RedirectStandardOutput = true,
RedirectStandardError = true,
UseShellExecute = false,
CreateNoWindow = true,
Verb = "runas",
};
Process process = new Process();
process.StartInfo = startInfo;
process.Start();
string output = process.StandardOutput.ReadToEnd();
string errors = process.StandardError.ReadToEnd();

use mongodb_name does not work in C# Process

I regular use command
use some_mongodb
to create new database from command prompt on windows
it seems that this command does not work when you want to execute this in C# process
I have the following code trying to create mongo database from C#
ProcessStartInfo startInfo = new ProcessStartInfo
{
UseShellExecute = false,
RedirectStandardOutput = true,
RedirectStandardError = true,
RedirectStandardInput = true,
WorkingDirectory = _mongoBinDir,
FileName = "mongo.exe",
Arguments = "use " + databaseTxt.Text
};
_mongoInsertProcess = new Process
{
StartInfo = startInfo
};
_mongoInsertProcess.Start();
string stderrStr = _mongoInsertProcess.StandardError.ReadToEnd();
string stdoutStr = _mongoInsertProcess.StandardOutput.ReadToEnd();
stdoutStr variable get value
"MongoDB shell version: 3.2.1 connecting to: use
2016-04-07T15:28:52.875+0200 E - [main] file [some_db] doesn't
exist failed to load: some_db"
Please advise on this.

use some_db isn't a valid argument. Just pass the name of the database i.e:
ProcessStartInfo startInfo = new ProcessStartInfo
{
UseShellExecute = false,
RedirectStandardOutput = true,
RedirectStandardError = true,
RedirectStandardInput = true,
WorkingDirectory = _mongoBinDir,
FileName = "mongo.exe",
Arguments = databaseTxt.Text
};

How can running CMD from c# with a hidden CMD

How can running CMD from c# without to see the cmd windows?

In ProcessStartInfo there's a parameter called CreateNoWindow
public static string ExecuteCommand(string command) {
ProcessStartInfo procStartInfo = new ProcessStartInfo("cmd", "/c " + command)
{
RedirectStandardError = true,
RedirectStandardOutput = true,
UseShellExecute = false,
CreateNoWindow = true
};
using (Process proc = new Process())
{
proc.StartInfo = procStartInfo;
proc.Start();
string output = proc.StandardOutput.ReadToEnd();
if (string.IsNullOrEmpty(output))
output = proc.StandardError.ReadToEnd();
return output;
}
}