VS2015，在解決方案中新建一個C++ DLL項目，一個C# Winform項目；

dllmain.cpp;

#include "stdafx.h"BOOL APIENTRY DllMain( HMODULE hModule,DWORD ul_reason_for_call,LPVOID lpReserved) {switch (ul_reason_for_call){case DLL_PROCESS_ATTACH:case DLL_THREAD_ATTACH:case DLL_THREAD_DETACH:case DLL_PROCESS_DETACH:break;}return TRUE; }

這個是自動生成；case DLL_xxxx_xxxx，這幾個是DLL消息；

stdafx頭文件和C文件不用管；

DllTest2.cpp里面添加3個函數；

#include "stdafx.h" #include "DllTest2.h" #include <string.h>DllTest2_API int __stdcall Add(int a, int b) {return a + b; }DllTest2_API int __stdcall Multitwo(int a, int b) {return a * b; }DllTest2_API char __stdcall getc1(char c1) {return c1; }

DllTest2.h里面為三個函數添加導出說明；說明此dll導出的3個函數；

#define DllTest2_API __declspec(dllexport) EXTERN_C DllTest2_API int __stdcall Add(int a, int b);EXTERN_C DllTest2_API int __stdcall Multitwo(int a, int b);EXTERN_C DllTest2_API char __stdcall getc1(char c1);

?

C#項目進行調用測試；

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices;namespace test2 {public partial class Form1 : Form{[DllImport(@"G:\xxxx\VCWorkspace\DllTest2\Debug\DllTest2.dll")]extern static int Add(int a, int b);[DllImport(@"G:\xxxx\VCWorkspace\DllTest2\Debug\DllTest2.dll")]extern static int Multitwo(int a, int b);[DllImport(@"G:\xxxx\VCWorkspace\DllTest2\Debug\DllTest2.dll")]extern static char getc1(char c1);public Form1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){int c = Add(100, 67);textBox1.Text = textBox1.Text + c.ToString() + Environment.NewLine;textBox1.Text += Environment.NewLine;}private void button2_Click(object sender, EventArgs e){int c = Multitwo(99, 7);textBox1.Text = textBox1.Text + c.ToString() + Environment.NewLine;textBox1.Text += Environment.NewLine;}private void button3_Click(object sender, EventArgs e) //char 測試{char c1 = 'f';char d1 = getc1(c1);textBox1.Text = textBox1.Text + d1 + Environment.NewLine;textBox1.Text += Environment.NewLine;}} }

生成解決方案；此處C#調用寫的是DLL生成的絕對路徑；C#不用引用DLL項目；每次修改了dll代碼，重新生成解決方案；

啟動C#項目；可以測試調用C++ DLL了；

總結

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