[P]DLL，Dynamic Link Library，动态链接库。这是微软的一项技术，必须包含<windows.h>。
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[/P]vs2010创建dll项目[P]流程： File|New|Project|Visual C++|Win32 | Win32 Console Application|DLL(Additional options|Export symbols)[/P][P]以工程名12345为例。[/P][P][upload=15769,0]09224056_1.jpg[/upload]
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[/P][P][P][P] [P][P][P][TABLE][tr][td][i][/i] [/td][td][P][P]// The following ifdef block is the standard way of creating macros which make exporting [/P][P]// from a DLL simpler. All files within this DLL are compiled with the MY12345_EXPORTS[/P][P]// symbol defined on the command line. This symbol should not be defined on any project[/P][P]// that uses this DLL. This way any other project whose source files include this file see [/P][P]// MY12345_API functions as being imported from a DLL, whereas this DLL sees symbols[/P][P]// defined with this macro as being exported.[/P][P]#ifdef MY12345_EXPORTS[/P][P]#define MY12345_API __declspec(dllexport)[/P][P]#else[/P][P]#define MY12345_API __declspec(dllimport)[/P][P]#endif[/P][P]
[/P][P]// This class is exported from the 12345.dll[/P][P]class MY12345_API CMy12345 {[/P][P]public:[/P][P] CMy12345(void);[/P][P] // TODO: add your methods here.[/P][P] void fun(char* str);[/P][P]};[/P][P]extern MY12345_API int nMy12345;[/P][P]
[/P][P]MY12345_API int fnMy12345(void);[/P][P][/P][/td][/tr][/TABLE][/P][P][/P][P][/P] [URL=https://code.csdn.net/snippets/423094] 来自CODE的代码片 [/URL][P]12345.h [/P][P][/P][P][/P][P] [P][P][P][TABLE][tr][td][URL=http://blog.csdn.net/chuchus/article/details/37599915#L1][i][/i] [/URL][/td][td][P][P]// 12345.cpp : Defines the exported functions for the DLL application.[/P][P]//[/P][P]
[/P][P]#include "stdafx.h"[/P][P]#include "12345.h"[/P][P]
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[/P][P]// This is an example of an exported variable[/P][P]MY12345_API int nMy12345=0;[/P][P]
[/P][P]// This is an example of an exported function.[/P][P]MY12345_API int fnMy12345(void)[/P][P]{[/P][P] return 42;[/P][P]}[/P][P]
[/P][P]// This is the constructor of a class that has been exported.[/P][P]// see 12345.h for the class definition[/P][P]CMy12345::CMy12345()[/P][P]{[/P][P] return;[/P][P]}[/P][P]void CMy12345::fun(char* str){[/P][P] cout<<str;[/P][P]}[/P][P][/P][/td][/tr][/TABLE][/P][P][/P][P][/P] [URL=https://code.csdn.net/snippets/423096] 来自CODE的代码片 [/URL][P]12345.cpp [/P][P][/P]
[P][/P][P][P] [P][P][P][TABLE][tr][td][URL=http://blog.csdn.net/chuchus/article/details/37599915#L1][i][/i] [/URL][/td][td][P][P]// dllmain.cpp : Defines the entry point for the DLL application.[/P][P]#include "stdafx.h"[/P][P]
[/P][P]BOOL APIENTRY DllMain( HMODULE hModule,[/P][P] DWORD ul_reason_for_call,[/P][P] LPVOID lpReserved[/P][P] )[/P][P]{[/P][P] switch (ul_reason_for_call)[/P][P] {[/P][P] case DLL_PROCESS_ATTACH:[/P][P] case DLL_THREAD_ATTACH:[/P][P] case DLL_THREAD_DETACH:[/P][P] case DLL_PROCESS_DETACH:[/P][P] break;[/P][P] }[/P][P] return TRUE;[/P][P]}[/P][P][/P][/td][/tr][/TABLE][/P][P][/P][P][/P] [URL=https://code.csdn.net/snippets/423098] 来自CODE的代码片 [/URL][P]dllmain.cpp [/P][P][/P]
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[/P][P]项目生成，就会有 12345.dll 12345.lib两个文件。[/P][P]头文件是声明[/P][P]lib是函数入口说明[/P][P]dll是函数体[/P]创建后的调用[P][P] [P][P][P][TABLE][tr][td][URL=http://blog.csdn.net/chuchus/article/details/37599915#L1][i][/i] [/URL][/td][td][P][P]//dll_use.cpp[/P][P]#include <iostream>[/P][P]#include "12345.h"[/P][P]#pragma comment (lib,"12345.lib") //12345.dll 12345.lib 12345.h dll_use.cpp,four files,are in the same directory.[/P][P]using namespace std;[/P][P]int main(int argc, char *argv[])[/P][P]{[/P][P] CMy12345 obj;[/P][P] obj.fun("hi\n");[/P][P] cout<<nMy12345<<endl;[/P][P] cout<<fnMy12345();[/P][P] getchar();[/P][P] getchar();[/P][P] return 0;[/P][P]}[/P][P][/P][/td][/tr][/TABLE][/P][P][/P][P][/P] [URL=https://code.csdn.net/snippets/423100] 来自CODE的代码片 [/URL][P]dll_use.cpp [/P][P][/P]
[P][/P][P]运行效果：[/P][P][upload=15770,0]09224056_2.jpg[/upload][/P]