Re: [DOTNET-ROTOR] Hosting Rotor

[Jan Kotas]

The assert you are seeing is just a sideefect. It is caused by a buggy
error handling codepath in ClrCreateManagedInstance.

The actual problem is that the fusion is not able to locate the assembly
in the GAC. Unfortunately one of the limitations of the current
implementation of ClrCreateManagedInstance is that it needs a fully
qualified name of the assembly in order to find it in the GAC. Here is
an example of a fully qualified name of an assembly that worked for me:

    hr = ClrCreateManagedInstance(
 
L"System.Xml.Xsl.XslTransform,System.Xml,Version=1.0.3300.0,Culture=neut
ral,PublicKeyToken=b77a5c561934e089",
        IID_IManagedInstanceWrapper,
        (void**)&pWrap);

We will try to do better for the next Rotor release...

-Jan

This posting is provided "AS IS" with no warranties, and confers no
rights.

-----Original Message-----
From: Ted Neward [mailto:[EMAIL PROTECTED]] 
Sent: Thursday, August 01, 2002 4:01 PM
To: [EMAIL PROTECTED]
Subject: [DOTNET-ROTOR] Hosting Rotor


I'm trying to extend and experiment with the ffi_test example, which
demonstrates how to create a managed instance within Rotor from
unmanaged code; I've reproduced the .cpp code here[1] for reference.

So I take the first section of code, to do the
ClrCreateManagedInstance(), and I change it to do one of my own types:

  hr = ClrCreateManagedInstance(
      L"Personal.Hello,Hello,PublicKeyToken=2087f203b8e16004",
      //L"System.Object,mscorlib,PublicKeyToken=b03f5f7f11d50a3a",
      //L"System.Random,mscorlib,PublicKeyToken=b03f5f7f11d50a3a",
      IID_IManagedInstanceWrapper,
      (void**)&pWrap);
  if (FAILED(hr)) {
      fprintf(stderr, "ClrCreateManagedInstance failed with
hr=0x%08x\n", hr);
      return 2;
  }

When I execute this code using the Personal.Hello type as the target
(where Personal.Hello is a strongly-named assembly installed in the
GAC), I trip an assertion failure:

C:\Prg\Rotor\sscli\tests\dev\host_test>rotor_x86\host.exe
Assert failure(PID 2296 [0x000008f8], Thread: 2308 [0x904]):
!m_fPreemptiveGCDisabled
    File: r:\rotor\19jun2002\sscli\clr\src\vm\threads.h, Line: 899
Image: C:\Prg\Rotor\sscli\tests\dev\host_test\rotor_x86\host.exe

Whereas running with the Microsoft types (System.Object or
System.Random) offers up no such assertion. Anybody got any ideas what's
going on here, or what I'm doing wrong? (I'm hoping this is a
quick-answer--I've not dug into the ClrCreateInstance impl to try and
debug it.)

Ted Neward
{.NET || Java} Course Author & Instructor, DevelopMentor
(http://www.develop.com)
http://www.javageeks.com/tneward http://www.clrgeeks.com/tneward

[1] from sscli/tests/dev/ffi_test/ffitest.cpp

#include "windows.h"
#include "stdlib.h"

#include "cor.h"
#include "mscoree.h"
#include "corffi.h"

int __cdecl main(int argc, char ** argv, char ** envp)
{
    IManagedInstanceWrapper *pWrap;
    VARIANT RetVal;
    HRESULT hr;

    if (!PAL_RegisterLibrary(L"rotor_palrt") ||
        !PAL_RegisterLibrary(L"sscoree")) {
        fprintf(stderr, "PAL_RegisterLibraryW failed\n");
        return 1;
    }

    hr = ClrCreateManagedInstance(
        L"System.Random,mscorlib,PublicKeyToken=b03f5f7f11d50a3a",
        IID_IManagedInstanceWrapper,
        (void**)&pWrap);
    if (FAILED(hr)) {
        fprintf(stderr, "ClrCreateManagedInstance failed with
hr=0x%08x\n", hr);
        return 2;
    }

    VariantClear(&RetVal);
    hr = pWrap->InvokeByName(
        L"Next", CorFFIInvokeMethod, 0, NULL, &RetVal);

    if (FAILED(hr)) {
        fprintf(stderr, "InvokeMethodByName failed with hr=0x%08x\n",
hr);
        return 3;
    }

    if (V_VT(&RetVal) != VT_I4) {
        fprintf(stderr, "Invalid return type (%d)\n", V_VT(&RetVal));
        return 3;
    }

    printf("System.Random.Next() returned %d\n", V_I4(&RetVal));

    pWrap->Release();

    return 0;
}