Develop Reference

OCTAVE .m file to execute in C# MVC

my application is in C# MVC with framework 4.5.2 and want to run external file(.m) and get output from that and it is written in Octave.
Note: Output result is in a string, so I have to show that output in C# html page.
Algorithm is written in octave and also in algorithm excel file is there to read data and external parameters are also passing through C#.
I tried the things which is already posted, the main concern is that my application is hosted in azure cloud. So, I can not install octave in cloud.
Can you suggest me any other way that directly run external file(.m) with dynamic excel file and parameters.
I can show my code what I have done. Its work in local with all but I can not install Octave in Azure cloud..
I put my installed folder to root path on server but its also not working.
public Octave(string pathToOctaveBinaries, bool createWindow)
{
StartOctave(pathToOctaveBinaries, createWindow);
}
private void StartOctave(string pathToOctaveBinaries, bool createWindow)
{
_ptob = pathToOctaveBinaries;
cw = createWindow;
this.OctaveEchoString = Guid.NewGuid().ToString();
OctaveProcess = new Process();
ProcessStartInfo pi = new ProcessStartInfo();
if (pathToOctaveBinaries[pathToOctaveBinaries.Length - 1] != '\\')
pathToOctaveBinaries = pathToOctaveBinaries + "\\";
pi.FileName = pathToOctaveBinaries + "octave-cli.exe";
pi.RedirectStandardInput = true;
pi.RedirectStandardOutput = true;
pi.RedirectStandardError = true;
pi.UseShellExecute = false;
pi.CreateNoWindow = !createWindow;
pi.Verb = "open";
//
pi.WorkingDirectory = ".";
OctaveProcess.StartInfo = pi;
OctaveProcess.Start();
OctaveProcess.OutputDataReceived += new DataReceivedEventHandler(OctaveProcess_OutputDataReceived);
OctaveProcess.BeginOutputReadLine();
OctaveEntryText = ExecuteCommand(null);
}
public string ExecuteCommand(string command, int timeout)
{
if (OctaveProcess.HasExited)
{
StartOctave(_ptob, cw);
if (OctaveRestarted != null) OctaveRestarted(this, EventArgs.Empty);
}
_exitError = false;
Thread tmp = new Thread(new ParameterizedThreadStart(WorkThread));
tmp.Start(command);
if (!tmp.Join(timeout))
{
tmp.Abort();
throw new Exception("Octave timeout");
}
if (_exitError)
{
throw new Exception(_errorMessage);
}
return SharedBuilder.ToString();
}
This above is Octave class file. Where I dynamically pass the path of .exe to be run as thread.
Controller Code:
Octave octave = new Octave(OctaveFilePath, false);
string fileData = result.Data.ToString();
fileData = fileData.Replace("#ExcelFilePath#", excelFilePath);
fileData = fileData.Replace("#ABCD#", historyData);
string rasp = octave.ExecuteCommand(fileData, 30000);
From here I get string and that I show into html page.

Asp.Net Mvc Delete file issue

I have an issue with Files.
I am doing an image importer so clients put their files on an FTP server and then they can import it in the application.
During the import process I copy the file in the FTP Folder to another folder with File.copy
public List<Visuel> ImportVisuel(int galerieId, string[] images)
{
Galerie targetGalerie = MemoryCache.GetGaleriById(galerieId);
List<FormatImage> listeFormats = MemoryCache.FormatImageToList();
int i = 0;
List<Visuel> visuelAddList = new List<Visuel>();
List<Visuel> visuelUpdateList = new List<Visuel>();
List<Visuel> returnList = new List<Visuel>();
foreach (string item in images)
{
i++;
Progress.ImportProgress[Progress.Guid] = "Image " + i + " sur " + images.Count() + " importées";
string extension = Path.GetExtension(item);
string fileName = Path.GetFileName(item);
string originalPath = HttpContext.Current.Request.PhysicalApplicationPath + "Uploads\\";
string destinationPath = HttpContext.Current.Server.MapPath("~/Images/Catalogue") + "\\";
Visuel importImage = MemoryCache.GetVisuelByFilName(fileName);
bool update = true;
if (importImage == null) { importImage = new Visuel(); update = false; }
Size imageSize = importImage.GetJpegImageSize(originalPath + fileName);
FormatImage format = listeFormats.Where(f => f.width == imageSize.Width && f.height == imageSize.Height).FirstOrDefault();
string saveFileName = Guid.NewGuid() + extension;
File.Copy(originalPath + fileName, destinationPath + saveFileName);
if (format != null)
{
importImage.format = format;
switch (format.key)
{
case "Catalogue":
importImage.fileName = saveFileName;
importImage.originalFileName = fileName;
importImage.dossier = targetGalerie;
importImage.dossier_id = targetGalerie.id;
importImage.filePath = "Images/Catalogue/";
importImage.largeur = imageSize.Width;
importImage.hauteur = imageSize.Height;
importImage.isRoot = true;
if (update == false) { MemoryCache.Add(ref importImage); returnList.Add(importImage); }
if (update == true) visuelUpdateList.Add(importImage);
foreach (FormatImage f in listeFormats)
{
if (f.key.StartsWith("Catalogue_"))
{
string[] keys = f.key.Split('_');
string destinationFileName = saveFileName.Insert(saveFileName.IndexOf('.'), "-" + keys[1].ToString());
string destinationFileNameDeclinaison = destinationPath + destinationFileName;
VisuelResizer declinaison = new VisuelResizer();
declinaison.Save(originalPath + fileName, f.width, f.height, 1000, destinationFileNameDeclinaison);
Visuel visuel = MemoryCache.GetVisuelByFilName(fileName.Insert(fileName.IndexOf('.'), "-" + keys[1].ToString()));
update = true;
if (visuel == null) { visuel = new Visuel(); update = false; }
visuel.parent = importImage;
visuel.filePath = "Images/Catalogue/";
visuel.fileName = destinationFileName;
visuel.originalFileName = string.Empty;
visuel.format = f;
//visuel.dossier = targetGalerie; On s'en fout pour les déclinaisons
visuel.largeur = f.width;
visuel.hauteur = f.height;
if (update == false)
{
visuelAddList.Add(visuel);
}
else
{
visuelUpdateList.Add(visuel);
}
//importImage.declinaisons.Add(visuel);
}
}
break;
}
}
}
MemoryCache.Add(ref visuelAddList);
// FONCTION à implémenter
MemoryCache.Update(ref visuelUpdateList);
return returnList;
}
After some processes on the copy (the original file is no more used)
the client have a pop-up asking him if he wants to delete the original files in the ftp folder.
If he clicks on Ok another method is called on the same controller
and this method use
public void DeleteImageFile(string[] files)
{
for (int i = 0; i < files.Length; i++)
{
File.Delete(HttpContext.Current.Request.PhysicalApplicationPath + files[i].Replace(#"/", #"\"));
}
}
This method works fine and really delete the good files when I use it in other context.
But here I have an error message:
Process can't acces to file ... because it's used by another process.
Someone have an idea?
Thank you.
Here's the screenshot of Process Explorer

There are couple of thing you can do here.
1) If you can repro it, you can use Process Explorer at that moment and see which process is locking the file and if the process is ur process then making sure that you close the file handle after your work is done.
2) Use try/catch around the delete statement and retry after few seconds to see if the file handle was released.
3) If you can do it offline you can put in some queue and do the deletion on it later on.

You solve this by using c# locks. Just embed your code inside a lock statement and your threads will be safe and wait each other to complete processing.

I found the solution:
in my import method, there a call to that method
public void Save(string originalFile, int maxWidth, int maxHeight, int quality, string filePath)
{
Bitmap image = new Bitmap(originalFile);
Save(ref image, maxWidth, maxHeight, quality, filePath);
}
The bitmap maintains the file opened blocking delete.
just added
image.Dispose();
in the methos and it work fine.
Thank you for your help, and thank you for process explorer. Very useful tool

Automatically find the path of the python executable

I'm doing a project that uses python as background script and C# as guy.
My problem is that I can't figure out how to cause my GUI to automatically search for the pythonw.exe file in order to run my python scripts.
Currently I'm using this path:
ProcessStartInfo pythonInfo = new ProcessStartInfo(#"C:\\Users\\Omri\\AppData\\Local\\Programs\\Python\\Python35-32\\pythonw.exe");
but I want it to auto detect the path of pythonw.exe (I need to submit the project and it won't run on others computers unless they change the code itself)
Any suggestions may be helpful.

Inspired by #Shashi Bhushan's answer I made this function for getting the Python path reliably;
private static string GetPythonPath(string requiredVersion = "", string maxVersion = "") {
string[] possiblePythonLocations = new string[3] {
#"HKLM\SOFTWARE\Python\PythonCore\",
#"HKCU\SOFTWARE\Python\PythonCore\",
#"HKLM\SOFTWARE\Wow6432Node\Python\PythonCore\"
};
//Version number, install path
Dictionary<string, string> pythonLocations = new Dictionary<string, string>();
foreach (string possibleLocation in possiblePythonLocations) {
string regKey = possibleLocation.Substring(0, 4), actualPath = possibleLocation.Substring(5);
RegistryKey theKey = (regKey == "HKLM" ? Registry.LocalMachine : Registry.CurrentUser);
RegistryKey theValue = theKey.OpenSubKey(actualPath);
foreach (var v in theValue.GetSubKeyNames()) {
RegistryKey productKey = theValue.OpenSubKey(v);
if (productKey != null) {
try {
string pythonExePath = productKey.OpenSubKey("InstallPath").GetValue("ExecutablePath").ToString();
// Comment this in to get (Default) value instead
// string pythonExePath = productKey.OpenSubKey("InstallPath").GetValue("").ToString();
if (pythonExePath != null && pythonExePath != "") {
//Console.WriteLine("Got python version; " + v + " at path; " + pythonExePath);
pythonLocations.Add(v.ToString(), pythonExePath);
}
} catch {
//Install path doesn't exist
}
}
}
}
if (pythonLocations.Count > 0) {
System.Version desiredVersion = new System.Version(requiredVersion == "" ? "0.0.1" : requiredVersion),
maxPVersion = new System.Version(maxVersion == "" ? "999.999.999" : maxVersion);
string highestVersion = "", highestVersionPath = "";
foreach (KeyValuePair<string, string> pVersion in pythonLocations) {
//TODO; if on 64-bit machine, prefer the 64 bit version over 32 and vice versa
int index = pVersion.Key.IndexOf("-"); //For x-32 and x-64 in version numbers
string formattedVersion = index > 0 ? pVersion.Key.Substring(0, index) : pVersion.Key;
System.Version thisVersion = new System.Version(formattedVersion);
int comparison = desiredVersion.CompareTo(thisVersion),
maxComparison = maxPVersion.CompareTo(thisVersion);
if (comparison <= 0) {
//Version is greater or equal
if (maxComparison >= 0) {
desiredVersion = thisVersion;
highestVersion = pVersion.Key;
highestVersionPath = pVersion.Value;
} else {
//Console.WriteLine("Version is too high; " + maxComparison.ToString());
}
} else {
//Console.WriteLine("Version (" + pVersion.Key + ") is not within the spectrum.");
}
}
//Console.WriteLine(highestVersion);
//Console.WriteLine(highestVersionPath);
return highestVersionPath;
}
return "";
}

You can find python installation path by lookup following keys on windows machine.
HKLM\SOFTWARE\Python\PythonCore\versionnumber\InstallPath
HKCU\SOFTWARE\Python\PythonCore\versionnumber\InstallPath
for win64 bit machine
HKLM\SOFTWARE\Wow6432Node\Python\PythonCore\versionnumber\InstallPath
You can refer this post for how to read registry using C#
How to read value of a registry key c#

Find the environment variable name in Windows, for that assembly and use Environment.GetEnvironmentVariable(variableName)
Check out How to add to the pythonpath in windows 7?

An example on how to search for Python within the PATH environment variable:
var entries = Environment.GetEnvironmentVariable("path").Split(';');
string python_location = null;
foreach (string entry in entries)
{
if (entry.ToLower().Contains("python"))
{
var breadcrumbs = entry.Split('\\');
foreach (string breadcrumb in breadcrumbs)
{
if (breadcrumb.ToLower().Contains("python"))
{
python_location += breadcrumb + '\\';
break;
}
python_location += breadcrumb + '\\';
}
break;
}
}

Just change the FileName to "python.exe" if you already set python env path
private void runPython(string cmd, string args)
{
ProcessStartInfo start = new ProcessStartInfo();
start.FileName = "python.exe";
start.Arguments = string.Format("{0} {1}", cmd, args);
start.UseShellExecute = false;
start.RedirectStandardOutput = true;
using (Process process = Process.Start(start))
{
using (StreamReader reader = process.StandardOutput)
{
string result = reader.ReadToEnd();
Console.Write(result);
}
}
}

On my machine, with Python 3.11 installed, I can query it by defining this property:
public string PythonInstallPath
{
get => (string)Microsoft.Win32.Registry.GetValue(
#"HKEY_CURRENT_USER\SOFTWARE\Python\PythonCore\3.11\InstallPath",
"ExecutablePath", null);
}
Pythonw.exe is located in the same path, so you can do:
public string PythonWInstallPath
{
get => System.IO.Path.Combine(System.IO.Path.GetDirectoryName(PythonInstallPath),
"pythonw.exe");
}
There is also a way to look it up in the environment, check this out as an alternative.

c# - How to asynchronously stream output from ffmpeg

I created a method to call ffmpeg binaries and do stuff for me. It worked perfectly fine on a standard console application. I am trying to make a Windows Form Application version but there are few problems. The app freezes (but the progress bar is still updating) when the ffmpeg process is still running. The textboxes are not being updated. I cannot move the app window. I suspect this is because of the loop and I googled some stuff and found out that I might need to do this asynchronously but how do I do that exactly.
public void ffmpeg(string ffmpeg_exe, string args)
{
Process p = new Process();
p.StartInfo.FileName = ffmpeg_exe;
p.StartInfo.RedirectStandardError = true;
p.StartInfo.CreateNoWindow = true;
p.StartInfo.Arguments = args;
p.StartInfo.UseShellExecute = false;
p.Start();
StreamReader reader = p.StandardError;
string line;
string size = "", current_duration = "", duration = "";
while ((line = reader.ReadLine()) != null)
{
if (!string.IsNullOrEmpty(line))
{
if (line.Contains("Duration") && line.Contains("bitrate") && line.Contains("start"))
{
duration = RemoveWhitespace(Between(line, "Duration:", ", start"));
totaltime.Text = duration;
}
if (line.Contains("frame=") && line.Contains("size=") && line.Contains("time="))
{
size = RemoveWhitespace(Between(line, "size=", " time"));
current_duration = RemoveWhitespace(Between(line, "time=", " bitrate"));
progressBar_main.Value = Convert.ToInt32(Math.Round(TimeSpan.Parse(current_duration.Substring(0, current_duration.Length -3)).TotalSeconds * 100 / TimeSpan.Parse(duration.Substring(0,duration.Length-3)).TotalSeconds, 3));
current_time.Text = current_duration;
filesize.Text = size;
}
}
}
p.Close();
current_time.Text = "";
filesize.Text = "";
totaltime.Text = "";
progressBar_main.Value = 0;
}

Try using Task like this :
Action action = () =>
{
//Do your streaming here
};
Then start it :
Task t2 = Task.Factory.StartNew(action);
Hope this was useful.

Adding a Pause to the Execution in C# application

I have an application which read from a file and shows the contents of the file in popups. the text file contain data in such a way;
D:\\abc\\xyz.txt|xyz.txt
D:\\MP3\\boom.mp3|boom.mp3
Now the application reads a line from the text file and shows the line content in another form, and these popups are displayed at once, what i want to do is, if there are multiple lines then each popup is shown after a pause of 10sec, but Thread.Sleep(10000)is not working for me. the code to read is given below.
void FileDetected()
{
int counter = 0,c=1;
string line;
System.IO.StreamReader file = new System.IO.StreamReader(FILEPATH);
while ((line = file.ReadLine()) != null)
{
string[] words = line.Split('|');
c = 1;
path = ""; fileName = "";
foreach (string word in words)
{
if (c == 1)
path = word.Replace(#"\\", #"\");
if (c==2)
fileName = word;
c++;
}
counter++;
if (path != "" && fileName != "")
{
Console.WriteLine("Path :" + path);
Console.WriteLine("FileName: " + fileName);
popup dlg = new popup(path, fileName);
dlg.Show();
//Thread.Sleep(10000);
}
}
kindly guide me.

If you are using .NET 4.5 (or 4.0 with Visual Studio 2012 or newer by downloading Microsoft.Bcl.Async via NuGet) it is very easy to do with async/await.
//You will likely need to modify the calling code to use async/await too.
async Task FileDetected()
{
int counter = 0,c=1;
string line;
System.IO.StreamReader file = new System.IO.StreamReader(FILEPATH);
while ((line = file.ReadLine()) != null)
{
string[] words = line.Split('|');
c = 1;
path = ""; fileName = "";
foreach (string word in words)
{
if (c == 1)
path = word.Replace(#"\\", #"\");
if (c==2)
fileName = word;
c++;
}
counter++;
if (path != "" && fileName != "")
{
Console.WriteLine("Path :" + path);
Console.WriteLine("FileName: " + fileName);
popup dlg = new popup(path, fileName);
dlg.Show();
//Pauses the loop for 10 sec but does not lock up the UI.
await Task.Delay(10000);
}
}