Develop Reference

Xamarin Mac FFmpeg launch path not accessible

I have a Xamarin Forms project with Mac support and I am trying to implement FFmpeg, so I have downloaded the Static build from its official page and added it as in the resources folder of the Mac project with the build action in Content, then I have created a service that will basically remove the audio from a video that I indicate in a path with a FFmpeg command, to do the service I have based on the following answer and I have adapted it to C #:
https://stackoverflow.com/a/37422688/8496520
The problem is that when I try to execute the command I get the following error:
"NSInvalidArgumentException: launch path not accessible"
And I can't find out why this happens, I use the following code in the service (The error occurs when calling the Launch () method of the NSTask):
public void ExecuteFFmpeg()
{
try
{
var launchPath = NSBundle.MainBundle.PathForResource("ffmpeg", ofType: "");
var compressTask = new NSTask();
compressTask.LaunchPath = launchPath;
compressTask.Arguments = new string[] {
"-i",
"downloads/test.mp4",
"-c",
"copy",
"-an",
"nosound.mp4" };
compressTask.StandardInput = NSFileHandle.FromNullDevice();
compressTask.Launch();
compressTask.WaitUntilExit();
}
catch (Exception ex)
{
}
I have also uploaded the project to GitHub in case someone needs to consult the repository in its entirety: https://github.com/nacompllo/FFmpegSample

If you are not tied to NSTask you could use CliWrapper instead.
public static async ValueTask FfmpegRemoveAudio(string ffmpegPath, string inputFilePath, string outputFilePath)
{
await Cli.Wrap(ffmpegPath).WithArguments(new[] { "-i", inputFilePath, "-c", "copy", "-an", outputFilePath }).ExecuteAsync();
}
Beside of CliWrapper I also tested FfmpegCore and FFmpget.NET that also threw some similar exceptions like you describe. I have no glue, why they behavior different. See the complete working POC for details.

How to retrieve IVsDebugger from external DTE for automation in Visual Studio 2019

I am trying to write a VSIX for Visual Studio 2019 that controls multiple instances of the Visual Studio IDE. We are working on a networked project that requires some automation to perform testing of multiple users. In the past I would have used DTE in an external tool, but my understanding is that as of VS2017 the COM guids are no longer globally registered, so doing it within the IDE is the only way.
Regardless, I am trying to get the IVsDebugger so I can track events in the debugger. However, I am having no luck. I can get IVsDebugger2, 3, 4, 5 but not IVSDebugger. Here is the general flow of what I am doing:
void CaptureDebugger()
{
DTE dte = GetDTE(GetRemoteProcessID());
ServiceProvider sp = new ServiceProvider((Microsoft.VisualStudio.OLE.Interop.IServiceProvider)dte);
IVsDebugger vsDebugger = sp.GetService(typeof(SVsShellDebugger)) as IVsDebugger;
// vsDebugger is null!
IVsDebugger2 vsDebugger2 = sp.GetService(typeof(SVsShellDebugger)) as IVsDebugger2;
// vsDebugger2 is not null!
}
/// <summary>
/// Gets the DTE object from any devenv process.
/// </summary>
private static EnvDTE.DTE GetDTE(int processId)
{
object runningObject = null;
IBindCtx bindCtx = null;
IRunningObjectTable rot = null;
IEnumMoniker enumMonikers = null;
try
{
Marshal.ThrowExceptionForHR(CreateBindCtx(reserved: 0, ppbc: out bindCtx));
bindCtx.GetRunningObjectTable(out rot);
rot.EnumRunning(out enumMonikers);
IMoniker[] moniker = new IMoniker[1];
IntPtr numberFetched = IntPtr.Zero;
while (enumMonikers.Next(1, moniker, numberFetched) == 0)
{
IMoniker runningObjectMoniker = moniker[0];
string name = null;
try
{
if (runningObjectMoniker != null)
{
runningObjectMoniker.GetDisplayName(bindCtx, null, out name);
}
}
catch (UnauthorizedAccessException)
{
// Do nothing, there is something in the ROT that we do not have access to.
}
Regex monikerRegex = new Regex(#"!VisualStudio.DTE\.\d+\.\d+\:" + processId, RegexOptions.IgnoreCase);
if (!string.IsNullOrEmpty(name) && monikerRegex.IsMatch(name))
{
Marshal.ThrowExceptionForHR(rot.GetObject(runningObjectMoniker, out runningObject));
}
}
}
finally
{
if (enumMonikers != null)
Marshal.ReleaseComObject(enumMonikers);
if (rot != null)
Marshal.ReleaseComObject(rot);
if (bindCtx != null)
Marshal.ReleaseComObject(bindCtx);
}
return runningObject as EnvDTE.DTE;
}
What confuses me is I get get the local IVsDebugger via the call
var MYDEBUGGER = Package.GetGlobalService(typeof(SVsShellDebugger)) as IVsDebugger;
Which I see is using a GlobalService. I don't think there is an equivalent in the DTE I retrieve.
Any insight?

I ran into this issue as well (however in my case, I'm actually trying to retrieve the IVsDebugger in proc rather than what sounds like out of proc); after debugging into how vsdebug!CDebugger::QueryInterface works I determined the actual issue appears to be that the calling thread in your application needs to be STA.
When the calling thread in your application is MTA, while vsdebug!CDebugger::QueryInterface returns with HRESULT 0
This shortly gets turned into 0x80040155 (REGDB_E_IIDNOTREG) by OLE due to CStdWrapper::GetPSFactory failing to find a proxy DLL for this type
This error in turn gets converted by CRemoteUnknown::RemQueryInterface to 0x80004002 (E_NOINTERFACE)
Which is what is reported back to you if you try and Marshal.QueryInterface in C# to see what's going on directly.
If your program contains in-proc components that live inside the remote Visual Studio process (as mine does) you can retrieve and execute your operations against the IVsDebugger on the UI thread. Otherwise, you can potentially create a new Thread and call thread.SetApartmentState(ApartmentState.STA) on it prior to starting it

Puma.NET DLL Recognition of car numbers

I want to make an application - license plate recognition from image. I use OpenCvSharp and Puma.NET.
But when I start my application,writes that the number is not found.
When I use breakpoints - Exception - "Recognition engine halted with code:0"
I loaded three dll - dibapi.dll, puma.net.dll, puma.interop.dll.
Why numbers are not recognized?
public void RecognizePlate() //
{
plateList.Clear();
int i = 1;
foreach(var plateImage in plate)
{
plateList.Add(i.ToString()+ " ) " + RunPuma(plateImage));
i++;
}
}
string RunPuma(IplImage img) //
{
PumaPage Image = new PumaPage(img.ToBitmap());
using (Image)
{
Image.FileFormat = PumaFileFormat.RtfAnsi;
Image.AutoRotateImage = true;
Image.FontSettings.DetectBold = true;
Image.FontSettings.DetectItalic = true;
Image.EnableSpeller = false;
Image.Language = PumaLanguage.English;
try
{
string s = Image.RecognizeToString();
return s;
}
catch(Exception e)
{
return "This is NOT NUMBER";
}
}
return "Error";
}`

You will need to restart Visual Studio as Administrator and you should be able to work then.

The problem is an unsuccessful registration.
According the documentation, apuma.dll component should be registered during the installation. But *.bat file seems to be wrong, at least for my computer.
I solved problem with:
moving all files from Puma.NET\COM Server\Register to Puma.NET\COM Server
open console in Puma.NET\COM Server directory.
Typing this command: regsvr32 APuma.dll
If you get a successful registration message, George is your uncle!!

How to close a file in Autocad using C# keeping acad.exe running?

I am using visual studio 2010 and I am having a .DWG file which I want to open in autocad. Till now I have used this.
Process p = new Process();
ProcessStartInfo s = new ProcessStartInfo("D:/Test File/" + fileName);
p.StartInfo = s;
p.Start();
But what I want is to close the file inside the Autocad but not the autocad itself. (Means atocad.exe should be kept running).
Till now I hve used this but its closing the acad.exe not the file.
foreach (Process Proc in Process.GetProcesses())
{
if (Proc.ProcessName.Equals("acad"))
{
Proc.CloseMainWindow();
Proc.Kill();
}
}

Take the Autocad .NET libraries from Autodesk Sites (http://usa.autodesk.com/adsk/servlet/index?id=773204&siteID=123112)
Then you will be able to use Application and Document classes.
They will give you full control over opening and closing documents within the application.
You can find many articles on that, and can ask further questions.

AutoCAD does have an api. there are 4 assemblys. Two for in-process and two for COM.
inprocess :
acdbmgd.dll
acmgd.dll
COMInterop :
Autodesk.Autocad.Interop.dll
Autodesk.Autocad.Interop.Common.dll
this is a method that will open a new instance of AutoCAD or it will connect to an existing running instance of AutoCAD.
you will need to load these .dlls into your project references.
using Autodesk.AutoCAD.Interop;
using Autodesk.AutoCAD.Interop.Common;
namespace YourNameSpace {
public class YourClass {
AcadApplication AcApp;
private const string progID = "AutoCAD.Application.18.2";// this is AutoCAD 2012 program id
private string profileName = "<<Unnamed Profile>>";
private const string acadPath = #"C:\Program Files\Autodesk\AutoCAD 2012 - English\acad.exe";
public void GetAcApp()
{
try
{
AcApp = (AcadApplication)Marshal.GetActiveObject(progID);
} catch {
try {
var acadProcess = new Process();
acadProcess.StartInfo.Arguments = string.Format("/nologo /p \"{0}\"", profileName);
acadProcess.StartInfo.FileName = (#acadPath);
acadProcess.Start();
while(AcApp == null)
{
try { AcApp = (AcadApplication)Marshal.GetActiveObject(progID); }
catch { }
}
} catch(COMException) {
MessageBox.Show(String.Format("Cannot create object of type \"{0}\"",progID));
}
}
try {
int i = 0;
var appState = AcApp.GetAcadState();
while (!appState.IsQuiescent)
{
if(i == 120)
{
Application.Exit();
}
// Wait .25s
Thread.Sleep(250);
i++;
}
if(AcApp != null){
// set visibility
AcApp.Visible = true;
}
} catch (COMException err) {
if(err.ErrorCode.ToString() == "-2147417846"){
Thread.Sleep(5000);
}
}
}
}
}
closeing it is as simple as
Application.Exit();
and forgive the code. its atrocious, this was one of my first methods when i just started developing...

I doubt you will be able to do this unless AutoCAD has an API that you can hook into and ask it to close the file for you.
Your c# app can only do things to the process (acad.exe) , it doesn't have access to the internal operations of that process.

Also, you shouldn't use Kill unless the process has become unresponsive and certainly not immediately after CloseMainWindow.
CloseMainWindow is the polite way to ask an application to close itself. Kill is like pulling the power lead from the socket. You aren't giving it the chance to clean up after itself and exit cleanly.

There is one other possibility - this will only work if your C# code is running on the same machine as the AutoCAD process and it is not really recommended, but, if you are really stuck and are prepared to put up with the hassle of window switching you can send key strokes to an application using the SendKeys command.
MSDN articles here:
http://msdn.microsoft.com/EN-US/library/ms171548(v=VS.110,d=hv.2).aspx
http://msdn.microsoft.com/en-us/library/system.windows.forms.sendkeys.send.aspx
Using this you could send the key strokes to simulate the user using the menu commands to close the file.

To perform the closing of file, best way out is to follow the steps at this ObjectARX SDK for c# and change the following code with the below code.
[CommandMethod("CD", CommandFlags.Session)]
static public void CloseDocuments()
{
DocumentCollection docs = Application.DocumentManager;
foreach (Document doc in docs)
{
// First cancel any running command
if (doc.CommandInProgress != "" &&
doc.CommandInProgress != "CD")
{
AcadDocument oDoc =
(AcadDocument)doc.AcadDocument;
oDoc.SendCommand("\x03\x03");
}
if (doc.IsReadOnly)
{
doc.CloseAndDiscard();
}
else
{
// Activate the document, so we can check DBMOD
if (docs.MdiActiveDocument != doc)
{
docs.MdiActiveDocument = doc;
}
int isModified =
System.Convert.ToInt32(
Application.GetSystemVariable("DBMOD")
);
// No need to save if not modified
if (isModified == 0)
{
doc.CloseAndDiscard();
}
else
{
// This may create documents in strange places
doc.CloseAndSave(doc.Name);
}
}
}

C# Visual Studio 2008 Reference to system32.dll ... how?

I need the reference system32/shell32.dll as I use some shell functions to read out the recycling bin. I tried "Add Reference --> COM --> Microsoft Shell Controls and Automatation" and "Add Reference --> Browse ---> [going to the system32/shell32.dll directly]. Both adds the shell32 reference to my references. But when I look at the properties, I see the path of the reference looks like this: "C:\Users\Tim\Documents\Visual Studio 2008\Projects\Wing\FileWing\obj\Debug\Interop.Shell32.dll" ...
I'll not deploy this \obj\Debug\ path to my installer. So how can I reference the end-users shell32.dll directly? Is there a way? Why does VS2008 create this strange path? Can I change this path so it doesn't sit in this strange subfolder?
Hmmm. Okay after revisiting PInvoke, I'm sure that I don't quite get it :-/
Let me illustrate the code I need to handle. I'm digging though the recycling bin and seek for a item that I want to recover. Is there any way NOT fighting though the PInvoke to get this done?
private void recoverRecyclerBinEntry(string fileName, int size)
{
try
{
Shell Shl = new Shell();
Folder Recycler = Shl.NameSpace(10);
// scans through all the recyclers entries till the one to recover has been found
for (int i = 0; i < Recycler.Items().Count; i++)
{
FolderItem FI = Recycler.Items().Item(i);
string FileName = Recycler.GetDetailsOf(FI, 0);
if (Path.GetExtension(FileName) == "")
FileName += Path.GetExtension(FI.Path);
//Necessary for systems with hidden file extensions.
string FilePath = Recycler.GetDetailsOf(FI, 1);
string combinedPath = Path.Combine(FilePath, FileName);
if (size == FI.Size && fileName == combinedPath)
{
Debug.Write("Match found. Restoring " + combinedPath + "...");
Undelete(FI);
Debug.WriteLine("done.");
}
else
{
Debug.WriteLine("No match");
}
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
Debug.WriteLine(ex.StackTrace);
}
}
private bool Undelete(FolderItem Item)
{
try
{
foreach (FolderItemVerb FIVerb in Item.Verbs())
{
if (
(FIVerb.Name.ToUpper().Contains("WIEDERHERSTELLEN")) ||
(FIVerb.Name.ToUpper().Contains("ESTORE")) ||
(FIVerb.Name.ToUpper().Contains("NDELETE"))
)
{
FIVerb.DoIt();
return true;
}
}
//execute the first one:
Item.Verbs().Item(0).DoIt();
return true;
}
catch (Exception)
{
Debug.WriteLine("ERROR undeleting");
return false;
}
}

I believe you are looking for P/Invoke (Platform Invoke)
Once you get the method for including and using the DLLs down, you can visit pinvoke.net to get specific code snippets for using certain methods.

Are you just using DllImport to access functionality in shell32/kernel32? If so, you don't need to add a reference.
For example:
[DllImport("KERNEL32.DLL", EntryPoint="MoveFileW", SetLastError=true,
CharSet=CharSet.Unicode, ExactSpelling=true,
CallingConvention=CallingConvention.StdCall)]
public static extern bool MoveFile(String src, String dst);
Here's a tutorial on using platform invoke and here's an MSDN article.

After you add the dll reference using VS 2008, you can open the properties for the .dll.
Make sure Copy Local is set to True.
If that doesn't work another solution is to add the .dll as an item to you project, and make is as content, and tell it to copy to the output directory.