C++ 静态调用C的DLL库（调用lib文件）

妖狐艹你老母 2022-12-06 01:13 196阅读 0赞

# 编写DLL代码 #

## 新建工程 ##

新建空项目工程

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hoaGhoaGhoaGh3d3d3d3d3d3d3_size_16_color_FFFFFF_t_70][]

点击确定。然后右键项目选择新建项。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hoaGhoaGhoaGh3d3d3d3d3d3d3_size_16_color_FFFFFF_t_70 1][]

再次选择新建项，选中C++文件，将其改为MySocketClient.c，然后选择添加。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hoaGhoaGhoaGh3d3d3d3d3d3d3_size_16_color_FFFFFF_t_70 2][]

到这里，新建工程就完成了。

![20200910105252823.png][]

然后右键项目，选择属性 将配置类型改为动态库(.dll)

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hoaGhoaGhoaGh3d3d3d3d3d3d3_size_16_color_FFFFFF_t_70 3][]

## 编写头文件MySocketClient.h ##

\#ifndef \_INC\_MYSOCKETCLIENT\_H\_

\#define \_INC\_MYSOCKETCLIENT\_H\_

\#define Import\_SSS

\#ifdef Import\_SSS

\#define API \_declspec(dllexport)

\#else

\#define API \_declspec(dllimport)

\#endif

\#ifdef \_cplusplus//extern"C" 来告诉编译器:这是一个用C写成的库文件，请用C的方式来链接它们。

extern "C" \{

\#endif // \_cplusplus

API//导出函数，让外界调用。

int socketClient\_Init(void \*\*handle);

API

int socketClient\_Send(void \*handle, unsigned char \*buf, int buflen);

API

int socketClient\_Recv(void \*handle, unsigned char \*buf, int \*buflen);

API

int socketClient\_Destory(void \*handle);

\#ifdef \_cplusplus

\#endif // \_cplusplus

\#endif //\_INC\_MYSOCKETCLIENT\_H\_

## 编写MySocketClient.c ##

\#define *\_CRT\_SECURE\_NO\_WARNINGS*

\#include <stdlib.h>

\#include <string.h>

\#include <stdio.h>

\#include "MySocketClient.h"

typedef struct \_Sck\_Handle

char version\[16\];

char ip\[16\];

int port;

unsigned char \*p;

int len;

\}Sck\_Handle;//定义Handle的结构体。

int socketClient\_Init(void \*\*handle)

int ret = 0;

Sck\_Handle \*tmpHandle = *NULL*;

if (handle == *NULL*)

ret = -1;

*printf*("\[socketClient\_Init\] err %d handle=NULL \\n", ret);

return ret;

tmpHandle = (Sck\_Handle \*)*malloc*(sizeof(Sck\_Handle));

if (tmpHandle == *NULL*)

ret = -2;

*printf*("\[socketClient\_Init\] err:%d malloc err \\n", ret);

*memset*(tmpHandle, 0, sizeof(Sck\_Handle));//初始化结构体。

*strcpy*(tmpHandle->version, "1.0.0.1");

*strcpy*(tmpHandle->ip, "192.168.12.121");

tmpHandle->port = 11111;

\*handle = tmpHandle;

return ret;

socket报文发送

//\_\_declspec(dllexport)

int socketClient\_Send(void \*handle, unsigned char \*buf, int buflen)

int          ret = 0;

Sck\_Handle   \*tmpHandle = *NULL*;

if (handle == *NULL* || buf == *NULL* || buflen <= 0)

ret = -2;

*printf*("func socketclient\_send() err :%d  (handle == NULL ||  buf==NULL || buflen <=0 ) \\n", ret);

return ret;

tmpHandle = (Sck\_Handle \*)handle;

tmpHandle->len = buflen;

tmpHandle->p = (unsigned char \*)*malloc*(buflen);

if (tmpHandle->p == *NULL*)

ret = -2;

*printf*("func socketclient\_send() err :%d  malloc len:%d \\n", ret, buflen);

return ret;

*memcpy*(tmpHandle->p, buf, buflen); //数据的缓存到内存

*printf*("接收到发送数据是%s \\n", tmpHandle->p);

return ret;

socket报文接受

//\_\_declspec(dllexport)

int socketClient\_Recv(void \*handle, unsigned char \*buf, int \*buflen)

int          ret = 0;

Sck\_Handle   \*tmpHandle = *NULL*;

if (handle == *NULL* || buf == *NULL* || buflen == *NULL*)

ret = -2;

*printf*("func socketclient\_recv() err :%d  (handle == NULL ||  buf==NULL || buflen==NULL ) \\n", ret);

return ret;

tmpHandle = (Sck\_Handle \*)handle;

*memcpy*(buf, tmpHandle->p, tmpHandle->len);

\*buflen = tmpHandle->len; //间接赋值  告诉调用者 收到的数据的长度

*printf*("数据长度是%d \\n", tmpHandle->len);

return ret;

socket环境释放

//\_\_declspec(dllexport)

int socketClient\_Destory(void \*handle)

int          ret = 0;

Sck\_Handle   \*tmpHandle = *NULL*;

if (handle == *NULL*)

return -1;

tmpHandle = (Sck\_Handle \*)handle;

if (tmpHandle->p != *NULL*)

*free*(tmpHandle->p); //释放结构体 成员域的 指针所指向的内存空间

*free*(tmpHandle); //释放结构体内存

return 0;

然后右键编译工程。在Debug文件夹下面就可以看到生成的dll

# 静态调用 #

静态调用，使用lib文件调用

\#define  *\_CRT\_SECURE\_NO\_WARNINGS*

\#include <stdio.h>

\#include <windows.h>

\#include <iostream>

using namespace *std*;

\#pragma comment(lib,"MySocketClient.lib")

extern "C"

int socketClient\_Init(void \*\*handle);

int socketClient\_Send(void \*handle, unsigned char \*buf, int buflen);

int socketClient\_Recv(void \*handle, unsigned char \*buf, int \*buflen);

int socketClient\_Destory(void \*handle);

int main()

unsigned char buf\[1024\];

int buflen;

unsigned char out\[1024\];

int outlen;

void \*handle = *NULL*;

int ret = 0;

*strcpy*((char \*)buf, "aaaaAAAAAFFffffffdddddddd");

buflen = 9;

//客户端初始化 获取handle上下

ret = socketClient\_Init(&handle /\*out\*/);

if (ret != 0)

*printf*("func socketclient\_init() err:%d \\n ", ret);

goto End;

//客户端发报文

ret = socketClient\_Send(handle /\*in\*/, buf /\*in\*/, buflen /\*in\*/);

if (ret != 0)

*printf*("func socketclient\_send() err:%d \\n ", ret);

goto End;

//客户端收报文

ret = socketClient\_Recv(handle /\*in\*/, out /\*in\*/, &outlen/\*in out\*/);

if (ret != 0)

*printf*("func socketclient\_recv() err:%d \\n ", ret);

goto End;

*printf*("接收到的数据长度是%d \\n", outlen);

End:

//客户端释放资源

ret = socketClient\_Destory(handle/\*in\*/);

*printf*("hello...\\n");

*system*("pause");

return 0;

运行结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hoaGhoaGhoaGh3d3d3d3d3d3d3_size_16_color_FFFFFF_t_70 4][]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hoaGhoaGhoaGh3d3d3d3d3d3d3_size_16_color_FFFFFF_t_70 1]: /images/20221123/a2ec525b5cdb4fcf91daf3508083977e.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hoaGhoaGhoaGh3d3d3d3d3d3d3_size_16_color_FFFFFF_t_70 2]: /images/20221123/35a9789cd9e848b6a9fbbdf25af9d5c4.png
[20200910105252823.png]: /images/20221123/2e2ddbdf283e4695a2026013579a7d58.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hoaGhoaGhoaGh3d3d3d3d3d3d3_size_16_color_FFFFFF_t_70 3]: /images/20221123/6e296cb295814859ad163357498dd9cb.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hoaGhoaGhoaGh3d3d3d3d3d3d3_size_16_color_FFFFFF_t_70 4]: /images/20221123/3b7824d629594c75ba323a2c12cf6ecc.png