vshost32.exe crash when calling unmanaged DLL

I'm using a VS 2005 app to interface against an unmanaged (Fortran) DLL. When I run the compiled executable straight from the command line, everything is fine - the DLL can be accessed, and I can work with the functions in the DLL.

Unfortunately, when I launch the app from VS 2005, I get a popup stating "vshost32.exe has stopped working" and no useful debugging information.

Has anyone experienced this behavior, or know why this might be occuring? I can't figure out why it would run fine when launched stand-alone, but not via vshost32.

(One last note: I am using .local files to force registered dlls to be used from cwd, but this particular dll is not registered. I'm just noting it here in case it helps.)

Thanks very much,

Mike

I had problem with crashes of vshost32.exe the problem vanished when I checked the checkbox:

Properties -> Debug -> Enable unmanaged code debugging

Does it work for you?

EDIT: In more recent versions the option is called: Enable native code debugging (thanks Qwerty01)

EDIT: It also seems to help in VS2008 (@Deacon Frost), VS2010 (@Alxandr).

Not sure but you can disable use of the visual studio hosting process from Properties -> Debug

Might be that there is an unhandled exception. You could try to add the following code to handle all uncatched exceptions:

static void Main()
{
  // Add a handler for the UnhandledExceptionEvent
  AppDomain.CurrentDomain.UnhandledException +=
    new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);

  Application.EnableVisualStyles();
  Application.SetCompatibleTextRenderingDefault(false);
  Application.Run(new Form1());
}

static void CurrentDomain_UnhandledException
     (object sender, UnhandledExceptionEventArgs e)
{
    try
    {
        Exception ex = (Exception)e.ExceptionObject;

        MessageBox.Show(ex.ToString(), "Error", 
              MessageBoxButtons.OK, MessageBoxIcon.Stop);
    }
    finally
    {
        Application.Exit();  
    }
}

The reason for the underlying problem is that you might have a different working folder when debugging so that your native library is not found.

I am using Visual C# 2010 Express. I was able to stop the vshost32 crashes by navigating to Project -> Properties. I clicked on the Debug tab and unchecked the "Enable the Visual Studio hosting process" checkbox.

download dependency walker http://www.dependencywalker.com/ use it to open up your dll, and see if it relies on other dlls that are not present in that folder.

来源：https://stackoverflow.com/questions/735621/vshost32-exe-crash-when-calling-unmanaged-dll

标签

dll

visual-studio-2005

unmanaged

vshost32