C#写的dll,怎么才能在VC里调用?
C#写的dll,怎么才能在VC里调用?

------解决方案--------------------
两个文件组成：

C# 文件 CSharpServer.cs，它创建 CSharpServer.dll 文件。.dll 用于创建 CSharpServer.tlb 文件。
C++ 文件 COMClient.cpp，它创建可执行客户端 COMClient.exe。
文件 1：CSharpServer.cs
// CSharpServer.cs
// compile with: /target:library
// post-build command: regasm CSharpServer.dll /tlb:CSharpServer.tlb

using System;
using System.Runtime.InteropServices;
namespace CSharpServer
{
// Since the .NET Framework interface and coclass have to behave as
// COM objects, we have to give them guids.
[Guid( "DBE0E8C4-1C61-41f3-B6A4-4E2F353D3D05 ")]
public interface IManagedInterface
{
int PrintHi(string name);
}

[Guid( "C6659361-1625-4746-931C-36014B146679 ")]
public class InterfaceImplementation : IManagedInterface
{
public int PrintHi(string name)
{
Console.WriteLine( "Hello, {0}! ", name);
return 33;
}
}
}
文件 2：COMClient.cpp
// COMClient.cpp
// Build with "cl COMClient.cpp "
// arguments: friend

#include <windows.h>
#include <stdio.h>

#pragma warning (disable: 4278)

// To use managed-code servers like the C# server,
// we have to import the common language runtime:
#import <mscorlib.tlb> raw_interfaces_only

// For simplicity, we ignore the server namespace and use named guids:
#if defined (USINGPROJECTSYSTEM)
#import "..\RegisterCSharpServerAndExportTLB\CSharpServer.tlb " no_namespace named_guids
#else // Compiling from the command line, all files in the same directory
#import "CSharpServer.tlb " no_namespace named_guids
#endif
int main(int argc, char* argv[])
{
IManagedInterface *cpi = NULL;
int retval = 1;

// Initialize COM and create an instance of the InterfaceImplementation class:
CoInitialize(NULL);
HRESULT hr = CoCreateInstance(CLSID_InterfaceImplementation,
NULL, CLSCTX_INPROC_SERVER,
IID_IManagedInterface, reinterpret_cast <void**> (&cpi));

if (FAILED(hr))
{
printf( "Couldn 't create the instance!... 0x%x\n ", hr);
}
else
{
if (argc > 1)
{
printf( "Calling function.\n ");
fflush(stdout);
// The variable cpi now holds an interface pointer
// to the managed interface.
// If you are on an OS that uses ASCII characters at the
// command prompt, notice that the ASCII characters are
// automatically marshaled to Unicode for the C# code.
if (cpi-> PrintHi(argv[1]) == 33)
retval = 0;
printf( "Returned from function.\n ");
}
else
printf ( "Usage: COMClient <name> \n ");
cpi-> Release();
cpi = NULL;
}

// Be a good citizen and clean up COM:
CoUninitialize();
return retval;
}
输出
可以用以下命令行调用可执行客户端：COMClient <name> ，其中 <name> 表示要使用的任何字符串，如 COMClient friend。

Calling function.
Hello, friend!
Returned from function.
在示例 IDE 项目中，将项目“属性页”中的“命令行参数”属性设置为需要的字符串（例如，“friend”）。
------解决方案--------------------
可参照：
http://msdn.microsoft.com/library/chs/default.asp?url=/library/CHS/csr