当没有提供时，从COM + dll获取IDL（用于TLB） [英] Getting IDL (for TLB) from a COM+ dll when it is not provided

问题描述

我有一个.dll包含一些directshow过滤器（COM）与特定/自定义接口来查询。

I have a .dll that contains some directshow filters (COM) with specific/custom interfaces to query.

大多数第三方directshow组件包含嵌入的.tlb文件可以用于跨环通信（C＃typelib import）。

Most 3rd party directshow components contain embedded .tlb files that can be used for cross-enviroment communication (C# typelib import).

我不愿意尝试手动创建c＃所需的接口，因为没有提供idl / tlb文件。

I would hate to have to attempt to manually create the interfaces needed for c# because no idl/tlb files were provided.

是否可以从COM .dll生成tlb（或至少是一个idl，我可以MIDL编译）？

Is it possible to generate a tlb (or at least, an idl, which I can MIDL compile) from a COM .dll?

推荐答案

是的，可以反向工程/反汇编IDL（或其他非常接近它）。你需要做的是给自己一个新的C ++控制台项目，它提供默认代码

Yes, it is possible to reverse engineer/disassemble IDL (or something very close to it). What you need to do is give yourself a new C++ Console Project which gives the default code of

#include "stdafx.h"

int _tmain(int argc, _TCHAR* argv[])
{
    return 0;
}

，然后在#include语句下插入#import语句。所以我一直在玩C＃汇编标记为COM Interop DLL，我称之为ComExample2，它住在与我添加的C ++控制台项目相同的解决方案，这意味着我可以使用一个很好的相对路径名。所以我的#import语句看起来像

and then you insert an #import statement underneath the #include statement. So I have been playing with C# assembly marked up to function as a COM Interop DLL and I have called it ComExample2 and it lives in the same solution as the C++ console project that I added which means I can use a nice relative pathname. So my #import statement looks like

#import "..\ComExample2\bin\Debug\ComExample2.tlb" no_namespace named_guids

然后构建控制台应用程序。如果你深入研究在生成期间生成的文件，你会发现一个以.TLH结尾的文件，它代表类型库头。所以我的路径是

Then you build your console application. If you delve into the files generated during the build you will find a file that ends with .TLH which stands for type library header. So my path is

..\ComExample2\ConsoleApplication1\Debug\comexample2.tlh

在我的文件里面看起来很像idl。这是一个编辑片段，给你一个风味....

Inside my file is something which looks very much like idl. Here is an edited snippet to give you a flavour....

struct __declspec(uuid("515b1b18-1602-4d42-b743-f1b3c458a0d0"))
/* LIBID */ __ComExample2;
struct /* coclass */ ComExampleClass2;

//
// Type library items
//

struct __declspec(uuid("713007fe-e74c-4fec-b91a-5ef8df279929"))
IFoo : IDispatch
{
    //
    // Wrapper methods for error-handling
    //

    _bstr_t Greeting ( );
    long Sim (
        long a,
        long b );

    //
    // Raw methods provided by interface
    //

      virtual HRESULT __stdcall raw_Greeting (
        /*[out,retval]*/ BSTR * pRetVal ) = 0;
      virtual HRESULT __stdcall raw_Sim (
        /*[in]*/ long a,
        /*[in]*/ long b,
        /*[out,retval]*/ long * pRetVal ) = 0;
};

struct __declspec(uuid("efe233b5-8ab3-4414-855e-1f027e0a72d5"))
ComExampleClass2;
    // interface _Object
    // [ default ] interface IFoo

这是生成代码，以便您可以轻松地将C ++代码对照COM库。

All of this is generated code so that you can script C++ code against a COM library easily. You'll have to pick through what you need but hopefully that should be enough.

亲爱的，

Lord BattenBerg

Lord BattenBerg

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