CLR profiler: issue in using DefineAssemblyRef

Question

I want to write a CLR profiler to hook our application function with GetILFunctionBody/SetILFunctionBody.

I want to use DefineAssemblyRef to import our c# dll (for use in IL code) in this code DefineAssemblyRef always return True? Does my dll have to be signed? Does it need to be installed in the Global Assembly Cache (GAC)?

     HRESULT CProfilerCallback::JITCompilationStarted
        (
        UINT functionId,
        BOOL fIsSafeToBlock
        )
    {
        ClassID classID;
        ModuleID moduleID;
        mdToken token;
        wchar_t wszClass[512];
        wchar_t wszMethod[512];
        HRESULT result = S_OK;
        ClassID classId = 0;
        ModuleID moduleId = 0;
        mdToken tkMethod = 0;

        // Get the moduleID and tkMethod    
        m_pICorProfilerInfo->GetFunctionInfo(functionId, &classId, &moduleId, &tkMethod);

        if(!GetMethodNameFromFunctionId(functionId,wszClass,wszMethod))
        {return S_FALSE;}


        if(wcscmp(wszMethod,L"FunctionName") == 0)
        {
            // Get the metadata import
            IMetaDataImport* pMetaDataImport = NULL;
            DebugBreak();
            result = m_pICorProfilerInfo->GetModuleMetaData
                (
                moduleId,
                ofRead, 
                IID_IMetaDataImport,
                (IUnknown** )&pMetaDataImport
                );


            if (FAILED(result))
            { return S_FALSE;}  
        //
        // Metadata modification
        //
        IMetaDataEmit* pMetaDataEmit = NULL;    
        IMetaDataAssemblyEmit* pMetaDataAssemblyEmit = NULL;  
        mdAssemblyRef tkLoggerLib;  
        HRESULT res;
        res = m_pICorProfilerInfo->GetModuleMetaData
            (
            moduleId,         /// The ID of the module to which the interface instance will be mapped
            ofRead | ofWrite,
            IID_IMetaDataEmit,
            (IUnknown** )&pMetaDataEmit
            );

        if (FAILED(res)) {DebugBreak();  return S_FALSE;}  /// DebugBreak for debug 

        res = pMetaDataEmit->QueryInterface
            (
            IID_IMetaDataAssemblyEmit,
            (void**)&pMetaDataAssemblyEmit
            );

        if (FAILED(res)) { return S_FALSE;}

        // Get the token for the Logger class and its Log method
        mdTypeDef tkLogger = 0;
        mdMethodDef tkLog = 0;

        // Create a token for the Log.dll assembly
        ASSEMBLYMETADATA amd;
        ZeroMemory(&amd, sizeof(amd));
        amd.usMajorVersion = 0;
        amd.usMinorVersion = 0;
        amd.usBuildNumber = 0;
        amd.usRevisionNumber = 0;

        res= pMetaDataAssemblyEmit->DefineAssemblyRef
            (
            NULL, 0, // No public key token
            L"Dllname",    ///dll name
            &amd, NULL, 0, 0,
            &tkLoggerLib
            );

        if (FAILED(res))  {return S_FALSE;  }

                ......

I haven't dabbled in .NET profilers for years, so I could be off base here, but why would you expect DefineAssemblyRef to fail? You're simply declaring a reference - the actual assembly is not resolved until the reference is used. Your assembly shouldn't have to be signed or in the GAC but the calling assembly does need to be able to find it, so if it's not in the GAC it needs to be in a directory that on the search path, IIRC. — 500 - Internal Server Error, Aug 23 '11 at 16:54
For posterity [this link](http://www.dupuis.me/node/18) was posted as an answer that appears that it may get deleted. The description in the link appears to be highly relevant to the question, though I don't have the knowledge tell for sure. — Ben, Nov 24 '12 at 12:13

score 1 · Answer 1 · edited Aug 11 '22 at 21:02

According to this MSDN blog http://blogs.msdn.com/b/davbr/archive/2006/02/27/540280.aspx :

IMetaDataAssemblyEmit::DefineAssemblyRef() gives you an mdAssemblyRef to your assembly. A little work is necessary to get this right. A reliable way to reference your assembly is to sign your assembly, add it to the GAC, and use the public key that "gacutil /l" prints out for you

You could also find usefull this project - CLR dynamic hook injection http://www.dupuis.me/node/18 that kind of demonstrates what you are trying to do.

CLR profiler: issue in using DefineAssemblyRef

1 Answers1

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