I would like to execute a cqlsh copy command from c# source code. I would like to execute a Python script, which exists under the folowing path:
C:\Program Files\DataStax Community\python\python.exe" "C:\Program Files\DataStax Community\apache-cassandra\bin\cqlsh.py
That will give me this screenshot:
Once in cqlsh, I can then run the command "copy emp to emp.csv"
The idea, is that I would like to execute all this from c# code. Here is what I did:
try
{
Process p = new Process(); // create process (i.e., the python program
p.StartInfo.FileName = #"C:\Python27\python.exe";
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.UseShellExecute = false; // make sure we can read the output from stdout
p.StartInfo.Arguments = #"C:\Program Files\DataStax Community\apache-cassandra\bin\cqlsh.py" + " " + "-e copy key_space.emp to 'D:/emp.csv'"; // start the python program with two parameters
p.Start(); // start the process (the python program)
p.WaitForExit();
}catch(Exception ex)
{
Console.WriteLine(ex.Message);
string strError = ex.Message;
}
There is no exception caught but also there is nothing happened in term of result.
Any help would be appreciated .
I'm pretty sure your problem is with this line:
bin\cqlsh.py" + " " + "copy emp to D:/emp.csv";
If you were to run this from the command line, cqlsh would require the -e flag to execute a command. In Windows it'd look something like this (assuming a keyspace name of "your_keyspace":
python bin\cqlsh.py -e "copy your_keyspace.emp to d:\emp.csv"
So to actually call that from your process, you would either have to escape the double quotes or just use single quotes:
bin\cqlsh.py" + " " + "-e 'copy your_keyspace.emp to d:\emp.csv'";
Related
Plan
The plan is to disable and subsequently enable a device from inside a windows forms application. To test the first building block of my plan, I open cmd with admin privileges and the following works perfectly:
> devcon hwids =ports
> devcon hwids *VID_10C4*
> devcon disable *VID_10C4*
> devcon enable *VID_10C4*
I can see the device being disabled and enabled again in device manager.
I can also achieve all of this by putting the commands into a batch file and running it from cmd with admin privileges. The above tells me that my plan is essentially good.
Application
However, what I actually want to do is achieve the same thing from inside a windows forms application:
I've set the following in the app manifest:
requestedExecutionLevel level="requireAdministrator" uiAccess="false"
For the sake of baby steps, I have checked this, just to ensure that there are no stupid mistakes in paths and whatnot. And it works just fine. The log file shows me the expected output from the dir command.
// Build String
string strCmdText =
"'/c cd " + prodPath +
" && dir " +
" > logs\\logFileEnablePrt.txt \"'";
// Run command
var p = new System.Diagnostics.Process();
var psi = new ProcessStartInfo("CMD.exe", strCmdText);
psi.Verb = "runas"; // admin rights
p.StartInfo = psi;
p.Start();
p.WaitForExit();
However, this does not work. It always returns an empty log file and does not change the device as expected:
// Build String
string strCmdText =
"'/c cd " + prodPath +
" && devcon hwids =ports " +
" > logs\\logFileEnablePrt.txt \"'";
// Run command
var p = new System.Diagnostics.Process();
var psi = new ProcessStartInfo("CMD.exe", strCmdText);
psi.Verb = "runas"; // admin rights
p.StartInfo = psi;
p.Start();
p.WaitForExit();
Error from cmd window is :
'devcon' is not recognized as an internal or external command,
operable program or batch file.
What's going on?
The above has me stumped. I've proved the commands work. I've proved my C# code works. But when I join the 2 together, it doesn't work...
NB: My C# program is running on my D: drive, if that makes any difference...
Updates Based on Comments
#Compo
Using your code, it does exactly the same as with mine. I see an empty log file & no changes made to the device. I've altered the /c to /k so I can see what going on the cmd terminal and I see this:
I've even tried your code C:\\Windows\\System32\\devcon hwids =usb pointing directly at devcon. Also tried \devcon.exe for completeness. The inexplicable error is :
I can see the flipping devcon.exe file sitting right there in the folder! Is there any reason it would not recognise it?
Also, with the command as you wrote it, the log file name is actually named logFileEnablePrt.txt'. I agree that your command looks right, so don't ask me why this happens!
#Panagiotis Kanavos
using your code, I get the following error:
This is at the line p.Start();. I tried putting in devcon.exe, and even the whole path (I checked the folder was in my PATH, and it is). Can't get past this. I actually stumbled on that answer you shared and arrived at this brick wall already.
Here is the code works for me, I don't have ports devices so I change it to usb.
public static void Main()
{
string prodPath = #"c:\devcon\x64";
// Build String
string strCmdText =
"/c \"cd /d " + prodPath +
" && devcon hwids =usb " +
" > log.txt \"";
// Run command
var p = new Process();
var psi = new ProcessStartInfo("CMD.exe", strCmdText);
psi.Verb = "runas"; // admin rights
p.StartInfo = psi;
p.Start();
p.WaitForExit();
}
Worked through a few steps and think I may have an answer...
Just specifying devcon fails as expected...windows cant find the exe as the folder it is in is not in the %PATH% variable in windows..
IF I specify the full path however it works...
It wasnt clear from your original code but if your copy of devcon is sitting in either System32 or Syswow directories you may be hitting an emulation issue as well...see here....
EDIT1:: A way to prove this would be to do Direcory.GetFiles(directory containing devcon) and see if the results line up with what you expect
As for passing arguments through to devcon I'd try something like this as opposed to trying to concatenate one giant cmd line..
A similar example but with netstat:
EDIT 2::Another example but with devcon:
The target platform here for the build was x64
EDIT3::
With my application build set to x86:
After working through the answers and comments above, I seem to have something that reliably works, which obviously I'd like to share back for scrutiny and future use.
So, my function ended up looking like this:
private int enablePort(string action)
{
while (true)
{
// Command Arg
string devconPath = #"c:\Windows\SysNative";
string strCmdText =
"'/c \"cd /d \"" +
devconPath +
"\" && c:\\Windows\\SysNative\\devcon " + action + " *VID_10C4* " +
"> \"" + prodPath + "\\logs\\logFileEnablePrt.txt\"\"";
// Process
var p = new Process();
var psi = new ProcessStartInfo()
{
Arguments = strCmdText,
Verb = "runas",
FileName = "CMD.exe",
UseShellExecute = true
};
p.StartInfo = psi;
p.Start();
p.WaitForExit();
// Grab log output
string logPath = prodPath + "\\logs\\logFileEnablePrt.txt";
Console.WriteLine("logPath = " + logPath);
string tempFile = System.IO.File.ReadAllText(logPath);
System.Console.WriteLine("Contents of WriteText.txt = \n{0}", tempFile);
// Check if it worked
var success = false;
if (tempFile.Contains(action))
{
success = true;
return 0;
}
// Error -> Allow user to try again!
if (MessageBox.Show("Was unable to " + action + " Test Jig COM port. Unlug & Replug USB. Check COM port is enabled if not working.", "COM Port Problem", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
{
return -1;
}
}
}
And the calling code was:
this.enablePort("disable");
int milliseconds = 3000;
await Task.Delay(milliseconds);
this.enablePort("enable");
As you can see in the code above, I've logged everything to see what was going on... Stepping through with the debugger, I can now see after the disable:
USB\VID_10C4&PID_EA60\0001 : Disabled
1 device(s) disabled.
And then after the enable:
USB\VID_10C4&PID_EA60\0001 : Enabled
1 device(s) are enabled.
The one extra thing I need to stress is that during testing, I thought I could hook a serial peripheral onto the port and determine whether it could disable and enable successfully by checking the connection. THIS DOES NOT WORK. The above code only works when the port is idle. Perhaps someone who understands the underlying software could hazard an explanation of why this is.
I have an audio converter .exe that i want to wrap in a C# program, for UI and inputs etc.
To use the AudioConverter.exe, it is ran from the console with the suffix " < inputFile > ouputFile".
So the full line reads something like
C:\\User\Audioconverter.exe < song.wav > song.ogg
So far i have been able to start the converter succesfully outside of C#, I have managed to have the converter run via create process in C# in a hang state (without input and output files).
My code in C# thus far is pretty similar to the answers given on this site:
using System;
using System.Diagnostics;
namespace ConverterWrapper2
{
class Program
{
static void Main()
{
LaunchCommandLineApp();
}
static void LaunchCommandLineApp()
{
// For the example
const string ex1 = "C:\\Users\\AudioConverter.exe";
const string ex2 = "C:\\Users\\res\\song.wav";
const string ex3 = "C:\\Users\\out\\song.ogg";
// Use ProcessStartInfo class
ProcessStartInfo startInfo = new ProcessStartInfo();
startInfo.CreateNoWindow = false;
startInfo.UseShellExecute = false;
startInfo.FileName = "AudioConverter2.exe";
startInfo.WindowStyle = ProcessWindowStyle.Normal;
startInfo.Arguments = ex1 + " < " + ex2 + " > " + ex3; \\Process is ran successfully without the addition of input and output files, but hangs waiting for files.
try
{
using (Process exeProcess = Process.Start(startInfo))
{
exeProcess.WaitForExit();
}
}
catch
{
// Log error.
}
}
}
}
So far the converter exe hasnt been able to start up correctly, this leads me to ask the question are inputs for stdin different from arguments?
Regardless i need to mimic this style of input and would appreciate any information. I had assumed that i could just pass the input and output files as arguments but i havent had much luck.
startInfo.Arguments = ex1 + " < " + ex2 + " > " + ex3; \\Process is ran successfully without the addition of input and output files, but hangs waiting for files.
That won't work.
A.exe < B > C is not process A.exe called with arguments < B > C. It's rather a shell instruction to:
start A.exe without arguments,
read file B and redirect its contents to the new process' stdin and
write the new process' stdout to file C.
You have two options to do that in C#:
You can use the help of the shell, i.e., you can start cmd.exe with arguments /c C:\User\Audioconverter.exe < song.wav > song.ogg or
you can re-implement what the shell is doing in C#. A code example for that can be found in this related question:
redirecting output to the text file c#
I am trying to execute one command through process but it is throwing exception as "The system cannot find the file specified". When i run this command directly on command prompt. It is working fine.
Command: start cmd.exe #cmd /k "NTttcpr.exe -r -m 1,*,192.168.1.2 -a 2 -t 120 -wu 10 -cd 10 >> NTTTCP-1T-TCP-IPV4-Rx-MTU1500-Support-port-1-Rx-AMD-10-GBE-RJ45-ITR-1.log"
This command executes perfectly if i run on command prompt.
This is how i written code:
string tool = #"NTttcpr.exe";
string command = " -r -m 1,*,192.168.1.2 -a 2 -t 120 -wu 10 -cd 10 >> NTTTCP-1T-TCP-IPV4-Rx-MTU1500-Support-port-1-Rx-AMD-10-GBE-RJ45-ITR-1.log";
private void RunCommand(string tool, string command)
{
try
{
logger.Info($"{MethodBase.GetCurrentMethod()}: {tool} {command}");
Process pro = new Process();
pro.StartInfo.FileName = "start cmd ";
pro.StartInfo.Arguments = "#cmd /k " + '"' + tool + " " + command + '"';
pro.StartInfo.UseShellExecute = false;
pro.StartInfo.RedirectStandardOutput = true;
logger.Info($"{MethodBase.GetCurrentMethod()}: Executing command: {tool} {command}");
pro.StartInfo.Verb = "runas";
pro.Start();
//pro.WaitForExit(MillisecondsTimeout);
//Thread.Sleep(MillisecondsTimeout);
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
logger.Error($"{MethodBase.GetCurrentMethod()}: Exception occurred while uni-directional command!!");
logger.Error($"{MethodBase.GetCurrentMethod()}: {ex}");
}
}
Note:
NTttcpr.exe file is already present in current executing directory.
Please help me to solve this.
This should be because you have not set the working directory, add pro.StartInfo.WorkingDirectory = "path to NTttcpr.exe" do not add NTttcpr.exe, just add the location.
Let me know if this works.
cmd.exe is not required for Process class. Try like below.
pro.StartInfo.FileName = "NTttcpr.exe";
pro.StartInfo.Arguments = command
I am trying to use the GFIX tool that gets shipped with Firebird Database inside my C#/WPF Application to execute certain commands on the database.
Firebird http://www.firebirdsql.org/en/firebird-2-5-3-upd1/
Gfix http://www.firebirdsql.org/manual/gfix.html
To do this I use the following code:
public string RunExternalExe(string filename, string arguments = null)
{
var process = new Process();
process.StartInfo.FileName = filename;
if (!string.IsNullOrEmpty(arguments))
{
process.StartInfo.Arguments = arguments;
}
process.StartInfo.CreateNoWindow = true;
process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardError = true;
process.StartInfo.RedirectStandardOutput = true;
var stdOutput = new StringBuilder();
process.OutputDataReceived += (sender, args) => stdOutput.Append(args.Data);
string stdError = null;
try
{
process.Start();
process.BeginOutputReadLine();
stdError = process.StandardError.ReadToEnd();
process.WaitForExit();
}
catch (Exception e)
{
throw new Exception("OS error while executing " + Format(filename, arguments) + ": " + e.Message, e);
}
if (process.ExitCode == 0)
{
return stdOutput.ToString();
}
else
{
var message = new StringBuilder();
if (!string.IsNullOrEmpty(stdError))
{
message.AppendLine(stdError);
}
if (stdOutput.Length != 0)
{
message.AppendLine("Std output:");
message.AppendLine(stdOutput.ToString());
}
throw new Exception(Format(filename, arguments) + " finished with exit code = " + process.ExitCode + ": " + message);
}
}
private string Format(string filename, string arguments)
{
return "'" + filename +
((string.IsNullOrEmpty(arguments)) ? string.Empty : " " + arguments) +
"'";
}
Found there
How To: Execute command line in C#, get STD OUT results
also I tried every other approach that gets explained in that question, but it still doesn't get me any output.
I try to execute the following command
gfix.exe -user foo -pa foo -shut single -force 0 app1:\bar.fdb
What I see if I execute it in CMD is the following output
"Your user name and password are not defined. Ask your database administrator to set up a Firebird login."
That's an obvious error because user foo with password foo doesn't exist.
So my problem isn't the error itself, its just the fact that I do NOT get this output inside my C# application not matter what I tried so far.
Since I am seeing the error output in my CMD screen it should get output in my C# application or is there any possibility that the tool itself is blocking the output and I don't have a chance to get it?
What I tried so far:
Calling the gfix.exe itself with the arguments.
Calling a bat that contains the call to gfix.exe with its arguments.
Calling CMD with /c or /k that calls the gfix.exe with arguments.
Calling CMD with /c or /k that calls a bat that calls the gfix.exe.
I believe I tried all possible combinations of calling this tool but still I don't get an output.
Also I have tried both RedirectStandardError and RedirectStandardOutput, with async/sync approaches (Begin.. and ReadToEnd), also I tried to input the arguments with the help of RedirectStandardInput and wrote the lines exactly as I would type it with CMD, first a cd "C:\Test" and than the call to gfix.exe all in vain...
Further info the tool works fine if I input everything correctly its runs through and does exactly what it should do, but I would also like to catch when the tool fails and want to output the corresponding error.
Edit:
Notice that I tried the following now, without my C# app involved only doubleclick the bat or executing it in CMD.
I have modified my test bat file to this:
gfix.exe -user foo -pa foo -shut single -force 0 app1:/bar.fdb > Test.txt 2> error.txt
Which creates 2 Text files - both empty.
If I run this .bat in CMD no error is displayed, if I remove the 2> error.txt the error message again gets displayed in the CMD screen. So the redirect seems to "work" only that my txt files are empty... could the gfix tool block this?!?
This works for me:
using (var process = Process.Start(
new ProcessStartInfo
{
FileName = fileName,
Arguments = args,
WindowStyle = ProcessWindowStyle.Hidden,
CreateNoWindow = true,
RedirectStandardError = true,
UseShellExecute = false,
}))
{
process.WaitForExit();
if (process.ExitCode != 0)
{
var errorMessage = process.StandardError.ReadToEnd();
Assert.Fail(errorMessage);
}
}
Note the RedirectStandardError = true.
When error happens gfix outputs it not to stdout, but to stderr. This is obvious and std behavior.
I am trying to export a database from c# using mysqldump.
When I run it i get this message: Unknown database 'mysqldump' when selecting the database.
I can't find the solution.
public static void mysqlBackup()
{
try
{
//string time = DateTime.Now.ToString("dd-MM-yyyy");
Log.Info("Starting MySQL dump");
Process MySqlDump = new Process();
MySqlDump.StartInfo.FileName = #"mysqldump.exe";
MySqlDump.StartInfo.UseShellExecute = false;
MySqlDump.StartInfo.Arguments =
"mysqldump -uroot -p******** b3 >"+
" C:/Users/Administrator/Documents/temp/backups/backup.sql";
MySqlDump.StartInfo.RedirectStandardInput = false;
MySqlDump.StartInfo.RedirectStandardOutput = false;
MySqlDump.Start();
MySqlDump.WaitForExit();
MySqlDump.Close();
Log.Info("Successfull created");
}
catch (IOException ex)
{
Log.Error("Unable to write the database file" + ex.ToString());
}
}
I tried to remove the mysqldump from the arguments kinda the same problem.
The redirection operator > is not an argument to mysqldump. When you execute it on the command line, it's being interpreted by the command line itself, not by mysqldump. You have two choices here:
Use the --result-file option as others have mentioned
Capture the stdout of the process and do what you like with the output by setting the RedirectStandardOutput property of StartInfo to be true. After this, you can read from the StandardOutput stream of the process.
I think you need to specify the name of the database you want to dump as the first argument. Thanks to nathan it goes after --databases at the end.
MySqlDump.StartInfo.Arguments = "-u root -p *** database_name --result-file [path]\backup.sql";
You don't need to specify mysqldump again in the command either (not that it should make much difference).
The Mysql documentation states there are 3 ways to use the mysqldump command:
shell> mysqldump [options] db_name [tbl_name ...]
shell> mysqldump [options] --databases db_name ...
shell> mysqldump [options] --all-databases
Ensure the command works fine via your command line. If it does that execute that command directly within your code. If that works then start extracting your arguments and replacing them with your own parameters within code.
Basically you want to get as basic as possible and work back up from there.
If the file works on the command line, try this:
using (Process p = new Process())
{
p.StartInfo.FileName = #"mysqldump.exe -u root -p *** --database b3 -r test.sql"; <~~~ note the change here
p.Start();
p.WaitForExit();
}
The file will be dumped to your project folders bin/debug or bin/release folder unless you change that code.
Here is your edited method:
public static void mysqlBackup()
{
try
{
//string time = DateTime.Now.ToString("dd-MM-yyyy");
Log.Info("Starting MySQL dump");
using(Process MySqlDump = new Process()
{
MySqlDump.StartInfo.FileName = #"mysqldump.exe";
MySqlDump.StartInfo.UseShellExecute = false;
MySqlDump.StartInfo.Arguments = "-uroot -p******** b3 --result-file=C:/Users/Administrator/Documents/temp/backups/backup.sql";
MySqlDump.StartInfo.RedirectStandardInput = false;
MySqlDump.StartInfo.RedirectStandardOutput = false; //You can redirect this as mention in other answers
MySqlDump.Start();
MySqlDump.WaitForExit();
MySqlDump.Close();
}
Log.Info("Successfully created");
}
catch (IOException ex)
{
Log.Error("Unable to write the database file" + ex.ToString());
}
}