在C++中使用托管COM对象

我已经学习了许多关于如何在C++中使用COM对象的详细教程。我使用的是VS 2010 pro。我做了一个新的解决方案，叫做TestComInterop。制作了一个名为TestMath的C#项目。通过选择properties->Assembly Information->Make assembly COM-visible中的选项使其可见。然后我转到Signing属性，对名为MyMathCom.snk(无密码)的程序集进行签名。然后我使用GUID generator并制作了2个GUID。然后将这些代码放入我的程序中并进行编译。(成功)

using System.Runtime.InteropServices;
namespace TestMath
{
[Guid("599AD473-B0A9-4A6E-B260-CF6FDEBF151B"),InterfaceType(ComInterfaceType.InterfaceIsDual)]
public interface IClass1
{
void AddNumbers(byte[] array);
}
[Guid("62FBC3A9-E2C0-4B53-9BF3-FDE22AA0CFF2"),ClassInterface(ClassInterfaceType.None)]
public class Class1 : IClass1
{
public void AddNumbers(byte[] array)
{
ulong number = 0;
foreach (var item in array)
{
number += item;
}
System.Console.WriteLine("The answer is {0}", number);
System.Windows.Forms.MessageBox.Show("DOrk");
}
}
}

然后我为控制台应用程序做了一个C++项目。允许的MFC。

然后我添加了一个TypelibMFC类。我可以使用下拉框找到TestMath<1.0>，它有我的iClass1。我选择了它，它为我制作了头文件

// Machine generated IDispatch wrapper class(es) created with Add Class from Typelib Wizard
#import "C:\Users\rsny\Desktop\TestComInterop\TestComInterop\TestMath\bin\Debug\TestMath.tlb" no_namespace
// CClass1 wrapper class
class CClass1 : public COleDispatchDriver
{
public:
CClass1(){} // Calls COleDispatchDriver default constructor
CClass1(LPDISPATCH pDispatch) : COleDispatchDriver(pDispatch) {}
CClass1(const CClass1& dispatchSrc) : COleDispatchDriver(dispatchSrc) {}
// Attributes
public:
// Operations
public:

// IClass1 methods
public:
void AddNumbers(SAFEARRAY * array)
{
static BYTE parms[] = {VTS_NONE} ;
InvokeHelper(0x60020000, DISPATCH_METHOD, VT_EMPTY, NULL, parms, array);
}
// IClass1 properties
public:
};

编译后，它为我制作了tlh和tli文件。。

所以最后一步是运行我的代码。打开TestComInterop.cpp，这就是我找不到"标准"的方法。我尝试了各种不同的东西，但不确定该放什么……这是我的代码

// TestComInterop.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "TestComInterop.h"
#include "CClass1.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif

// The one and only application object
CWinApp theApp;
using namespace std;
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;
HMODULE hModule = ::GetModuleHandle(NULL);
if (hModule != NULL)
{
// initialize MFC and print and error on failure
if (!AfxWinInit(hModule, NULL, ::GetCommandLine(), 0))
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: MFC initialization failedn"));
nRetCode = 1;
}
else
{
// TODO: code your application's behavior here.
}
}
else
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: GetModuleHandle failedn"));
nRetCode = 1;
}
CClass1* myMath = new CClass1;
myMath->CreateDispatch("62FBC3A9-E2C0-4B53-9BF3-FDE22AA0CFF2");
//bool result = myMath.
if (myMath)
cout << "AWESOME" << endl;
else
cout << "LAME" << endl;
unsigned char numbers[5] = {0x01,0x02,0x03,0x04,0x05};
myMath->AddNumbers((SAFEARRAY*)numbers);
delete myMath;
getchar();
return nRetCode;
}

现在我希望它能把答案粘贴到我的控制台上。。但什么都没有。我还希望它能显示一个消息框。。。没有什么至少可以说，当涉及到COM对象时，我是个新手。到目前为止，用所有的工具等等做这件事并不太困难。。。但就我的一生而言，我无法让它发挥作用。

这里是我的tlh和tli文件，以备不时之需。

// Created by Microsoft (R) C/C++ Compiler Version 10.00.30319.01 (e323d9ba).
//
// c:usersrsnydesktoptestcominteroptestcominteroptestcominteropdebugtestmath.tli
//
// Wrapper implementations for Win32 type library C:\Users\rsny\Desktop\TestComInterop\TestComInterop\TestMath\bin\Debug\TestMath.tlb
// compiler-generated file created 09/14/12 at 12:08:08 - DO NOT EDIT!
#pragma once
//
// interface IClass1 wrapper method implementations
//
inline HRESULT IClass1::AddNumbers ( SAFEARRAY * array ) {
HRESULT _hr = raw_AddNumbers(array);
if (FAILED(_hr)) _com_issue_errorex(_hr, this, __uuidof(this));
return _hr;
}
// Created by Microsoft (R) C/C++ Compiler Version 10.00.30319.01 (e323d9ba).
//
// c:usersrsnydesktoptestcominteroptestcominteroptestcominteropdebugtestmath.tlh
//
// C++ source equivalent of Win32 type library C:\Users\rsny\Desktop\TestComInterop\TestComInterop\TestMath\bin\Debug\TestMath.tlb
// compiler-generated file created 09/14/12 at 12:08:08 - DO NOT EDIT!
#pragma once
#pragma pack(push, 8)
#include <comdef.h>
//
// Forward references and typedefs
//
struct __declspec(uuid("d29ff1b5-bf10-4bbe-9bd9-cb5346f4bfaf"))
/* LIBID */ __TestMath;
struct __declspec(uuid("599ad473-b0a9-4a6e-b260-cf6fdebf151b"))
/* dual interface */ IClass1;
struct /* coclass */ Class1;
//
// Smart pointer typedef declarations
//
_COM_SMARTPTR_TYPEDEF(IClass1, __uuidof(IClass1));
//
// Type library items
//
struct __declspec(uuid("599ad473-b0a9-4a6e-b260-cf6fdebf151b"))
IClass1 : IDispatch
{
//
// Wrapper methods for error-handling
//
HRESULT AddNumbers (
SAFEARRAY * array );
//
// Raw methods provided by interface
//
virtual HRESULT __stdcall raw_AddNumbers (
/*[in]*/ SAFEARRAY * array ) = 0;
};
struct __declspec(uuid("62fbc3a9-e2c0-4b53-9bf3-fde22aa0cff2"))
Class1;
// interface _Object
// [ default ] interface IClass1
//
// Wrapper method implementations
//
#include "c:usersrsnydesktoptestcominteroptestcominteroptestcominteropdebugtestmath.tli"
#pragma pack(pop)