将TLB转换为IDL

Question

有谁知道命令行工具可以从类型库(.tlb)生成idl文件吗？这样做的原因是为了消除从regasm生成的枚举值中的下划线。本博客讨论了枚举中的下划线问题。

http://blogs.artinsoft.net/mrojas/archive/2010/05/17/interop-remove-prefix-from-c-enums-for-com.aspx

我知道OLEView可以生成IDL文件，但我正在寻找一种适合自动构建的解决方案。

Answer 1

我怀疑这是一个能做你想做的事情的工具。但这应该不是太难滚动您自己的转换器。使用类型库有点麻烦。我编写了一个工具，用于从.idl文件或.tlb文件为COM接口生成C++包装类。读取接口相关信息的代码大约有250行代码，所以如果您添加一些代码来生成.idl文件，那么最终应该会有大约1000行代码。

下面的代码是我的C++代码的精简版本，应该可以让您大致了解一下。但是，由于我目前无法访问编译器，所以我无法检查它是编译(不太可能)还是工作(肯定不会)。

    #include <afxwin.h>
    #include <comdef.h>
    #include <atlconv.h>
    #include <atlbase.h>

    char* paTypeNames[] =
    {
        "VT_EMPTY",          // = 0,
        "VT_NULL",           // = 1,
        "short", //"VT_I2", //             = 2,
        "long", //"VT_I4", //             = 3,
        "real", // "VT_R4", //             = 4,
        "double", // "VT_R8", //             = 5,
        "VT_CY", //              = 6,
        "VT_DATE", //            = 7,
        "BSTR", //"VT_BSTR", //            = 8,
        "IDispatch*", // "VT_DISPATCH", //        = 9,
        "VT_ERROR", //           = 10,
        "VARIANT_BOOL", //"VT_BOOL", //            = 11,
        "VARIANT", //"VT_VARIANT", //         = 12,
        "IUnknown*", // VT_UNKNOWN        = 13,
        "VT_DECIMAL", //         = 14,
        "VBA reserves 15 for future use",
        "VT_I1", //              = 16,
        "VT_UI1", //             = 17,
        "VT_UI2", //             = 18,
        "VT_UI4", //             = 19,
        "VT_I8", //              = 20,
        "VT_UI8", //             = 21,
        "int", //"VT_INT", //             = 22,
        "UINT", //            = 23,
        "VOID", //            = 24,
        "HRESULT", //         = 25,
        "VT_PTR", //             = 26,
        "VT_SAFEARRAY", //       = 27,
        "VT_CARRAY", //          = 28,
        "VT_USERDEFINED", //     = 29,
        "VT_LPSTR", //           = 30,
        "VT_LPWSTR", //          = 31,
        "VBA reserves 32 for future use",
        "VBA reserves 33 for future use",
        "VBA reserves 34 for future use",
        "VBA reserves 35 for future use",
        "VT_RECORD", //          = 36,
        "VT_INT_PTR", //         = 37,
        "VT_UINT_PTR", //        = 38,
        "Unknown Type number above 39"
    };

    CString GetType (const TYPEDESC& p_TYPEDESC, ITypeInfo* p_pTypeInfo)
    {
        // Look up user defined types in the type library.
        if (p_TYPEDESC.vt == VT_USERDEFINED)
        {
            ITypeInfoPtr spInnerType;
            VERIFY (SUCCEEDED (p_pTypeInfo->GetRefTypeInfo (p_TYPEDESC.hreftype, &spInnerType)));
            BSTR CurrTypeName;
            VERIFY (SUCCEEDED (spInnerType->GetDocumentation (MEMBERID_NIL, &CurrTypeName, NULL, NULL, NULL)));
            return CString (CurrTypeName);
        }
        else if (p_TYPEDESC.vt == VT_PTR)
            return GetType (*p_TYPEDESC.lptdesc, p_pTypeInfo) + CString (_T("*"));
        else
        {
            return CString (paTypeNames[min (p_TYPEDESC.vt & VT_TYPEMASK, 39)]);
        }
    }


    bool ParseTypeLib (char* p_strTypeLibName)
    {
        USES_CONVERSION;

        // Load the type library.
        ITypeLibPtr spTypeLib;
        HRESULT hr = LoadTypeLibEx (A2OLE (p_strTypeLibName), REGKIND_DEFAULT, &spTypeLib);
        if (!(bool)spTypeLib)
            return false;

        UINT uiNumberOfTypes = spTypeLib->GetTypeInfoCount ();
        for (int i = 0; i < uiNumberOfTypes; i++)
        {
            ITypeInfoPtr spCurrTypeInfo;
            spTypeLib->GetTypeInfo (i, &spCurrTypeInfo);
            if (!(bool) spCurrTypeInfo)
                return false;

            // We only want to process interface definitions, so if we encounter anything
            // else (for example enums), we skip the rest of the loop.
            TYPEATTR* pCurrentTypeAttr;
            VERIFY (SUCCEEDED (spCurrTypeInfo->GetTypeAttr (&pCurrentTypeAttr)));
            if (pCurrentTypeAttr->typekind != TKIND_DISPATCH &&
                pCurrentTypeAttr->typekind != TKIND_INTERFACE)
                continue;

            // Retrieve the current interface name.
            CComBSTR CurrInterfaceName;
            hr = spTypeLib->GetDocumentation (i, &CurrInterfaceName, NULL, NULL, NULL);

            std::cout << "interface " << CurrInterfaceName;

            // Retrieve the name of the base class. According to MSDN
            // (http://msdn.microsoft.com/en-us/library/aa909031.aspx), we must first retrieve
            // the TKIND_INTERFACE type description for our class, and then we can retrieve
            // the base class information. We also need the TKIND_INTERFACE type description
            // because TKIND_DISPATCH type descriptions contain both the methods of the current
            // interface as well as the methods of all base interfaces.
            ITypeInfoPtr spBaseType;
            if (pCurrentTypeAttr->typekind == TKIND_DISPATCH)
            {
                HREFTYPE TempHREF;
                VERIFY (SUCCEEDED (spCurrTypeInfo->GetRefTypeOfImplType (-1, &TempHREF)));
                ITypeInfoPtr spTempInfo;
                VERIFY (SUCCEEDED (spCurrTypeInfo->GetRefTypeInfo (TempHREF, &spTempInfo)));
                spCurrTypeInfo = spTempInfo;
            }
            HREFTYPE BaseClassHREF;
            VERIFY (SUCCEEDED (spCurrTypeInfo->GetRefTypeOfImplType (0, &BaseClassHREF)));
            VERIFY (SUCCEEDED (spCurrTypeInfo->GetRefTypeInfo (BaseClassHREF, &spBaseType)));
            CComBSTR CurrBaseTypeName;
            VERIFY (SUCCEEDED (spBaseType->GetDocumentation (MEMBERID_NIL, &CurrBaseTypeName, NULL, NULL, NULL)));

            std::cout << " : " << CurrBaseTypeName << "{\n";

            // Process the methods of the current interface.
            FUNCDESC* pCurrFUNCDESC;
            int j = 0;
            while (SUCCEEDED (spCurrTypeInfo->GetFuncDesc (j++, &pCurrFUNCDESC)))
            {
                // Retrieve the return type of the COM method (this does not necessarily have to be
                // an HRESULT).
                std::cout << paTypeNames[pCurrFUNCDESC->elemdescFunc.tdesc.vt] << " ";

                // Ask for the function descriptor for the current function.
                unsigned int cNames;
                BSTR* CurrNames = DEBUG_NEW BSTR[pCurrFUNCDESC->cParams + 1];
                hr = spCurrTypeInfo->GetNames (pCurrFUNCDESC->memid, CurrNames, pCurrFUNCDESC->cParams + 1, &cNames);

                // The first element contains the name of the function.
                std::cout << CurrNames[0] << " (";

                // Process the parameters of the current function.
                for (int k = 0; k < pCurrFUNCDESC->cParams; k++)
                {
                    std::cout << "[";

                    // Determine the type of the parameter (in, out, retval).
                    bool needComma = false;
                    if (pCurrFUNCDESC->lprgelemdescParam[k].paramdesc.wParamFlags & PARAMFLAG_FIN)
                    {
                        std::cout << "in";
                        needComma = true;
                    }
                    if (pCurrFUNCDESC->lprgelemdescParam[k].paramdesc.wParamFlags & PARAMFLAG_FOUT)
                    {
                        if (needComma)
                            std::cout << ", ";
                        std::cout << "out";
                        needComma = true;
                    }
                    if (pCurrFUNCDESC->lprgelemdescParam[k].paramdesc.wParamFlags & PARAMFLAG_FRETVAL)
                    {
                        if (needComma)
                            std::cout << ", ";
                        std::cout << "retval";
                    }

                    std::cout << "] ";
                    std::cout << GetType (pCurrFUNCDESC->lprgelemdescParam[k].tdesc, spCurrTypeInfo);

                    // If we didn't get a name for the parameter, it must be the parameter of a property put
                    // method. In this case we call the parameter simply "RHS"
                    if (k + 1 >= cNames)
                        std::cout << "RHS";
                    else
                        std::cout << CurrNames[k + 1];
                }
                delete[] CurrNames;
            }
        }

        // If we have reached this line, all of the above operations must have succeeded.
        return true;
    }

你好，斯图尔特

Answer 2

如果这是存储的副作用(第三方？)TLB文件，而不是源代码控制中的IDL文件，一种可能是签入IDL，并在构建过程中自动生成TLB。

使用IDL而不是TLB有一个额外的好处，即使对COM接口的版本更改易于使用diff工具进行比较。