一.静态&动态装载DLL

     C++中接口通过编译为DLL对外提供调用,C#需要将DLL加载至本应用才可实现C++接口调用.

     1.静态装载

        C#应用程序在编译为可执行exe时将外部DLL装载至本应用中,例如在CSC编译指令中添加相关参数可实现DLL引用.

        csc /reference:user32.dll /out:HelloWorld.exe

     2.动态装载

        C#应用程序在运行时通过调用kernel32.dll中LoadLibrary完成外部DLL的装载.

二.编译C++DLL

     实现C++方法MYFunction,将接口编译为MyClass.dll

// MyClass.h
#ifdef BUILD_DLL
#define MY export __declspec(dllexport)
#else
#define MY export __declspec(dllimport)
#endifclass MY MyClass {
public:void MYFunction();
};// MyClass.cpp
#include "MyClass.h"void MyClass::MYFunction() {// Implementation
}

三.使用DllImport映射LoadLibrary接口

	public static class Kernel32{[DllImport("kernel32", CharSet = CharSet.Unicode, SetLastError = true)]public static extern IntPtr LoadLibrary(string lpFileName);}

四.使用DllImport映射MYFunction接口

	static class Tools{[DllImport("MyClass.dll", SetLastError = true)]internal static extern void MYFunction();}

五.C#调用DLL中接口

    public static void Main(){Kernel32.LoadLibrary("myclass.dll");Tool.MYFunction();}