c语言实现模拟发送报文

#include "stdlib.h"
#include "stdio.h"
#include "string.h"

typedef struct _SCK_HANDLE {
char		version[16];
char	    serverip[16];
int		serverport;
unsigned char *buf ;
int				buflen;
}SCK_HANDLE;

//客户端初始化 获取handle上下
__declspec(dllexport)
int cltSocketInit(void **handle /*out*/)
{
int ret = 0;
SCK_HANDLE *sh = NULL;
sh = (SCK_HANDLE *)malloc(sizeof(SCK_HANDLE));
if (sh == NULL)
{
ret = -1;
printf("func cltSocketInit() err: %d, malloc err....", ret);
return ret;
}
memset(sh, 0, sizeof(SCK_HANDLE));
strcpy(sh->serverip, "192.168.0.128");
sh->serverport= 88;

*handle = sh;
return ret;
}

//客户端发报文
__declspec(dllexport)
int cltSocketSend(void *handle /*in*/, unsigned char *buf /*in*/,  int buflen /*in*/)
{
int		ret = 0;
SCK_HANDLE *sh = NULL;

if (handle==NULL || buf==NULL)
{
ret = -1;
printf("func cltSocketSend() err: %d, (handle==NULL || buf==NULL)", ret);
return ret;
}
sh = (SCK_HANDLE *)handle ;
sh->buf = (char *)malloc(buflen);
if (sh->buf == NULL)
{
ret = -2;
printf("func cltSocketSend() err: %d, (buflen:%d)", ret, buflen);
return ret;
}
memcpy(sh->buf, buf, buflen);
sh->buflen = buflen;

return ret;
}

//客户端收报文
__declspec(dllexport)
int cltSocketRev(void *handle /*in*/, unsigned char *buf /*in*/, int *buflen /*in out*/)
{
int  ret = 0;
SCK_HANDLE *sh = NULL;

if (handle==NULL || buf==NULL || buflen==NULL)
{
ret = -1;
printf("func cltSocketSend() err: %d, ((handle==NULL || buf==NULL || buflen==NULL))", ret);
return ret;
}

sh = (SCK_HANDLE *)handle;

memcpy(buf, sh->buf, sh->buflen);
*buflen  = sh->buflen;

if (sh->buf != NULL)
{
free(sh->buf);
sh->buf = NULL; //把状态回到原始
sh->buflen = 0;
}
return ret;
}

//客户端释放资源
__declspec(dllexport)
int cltSocketDestory(void *handle/*in*/)
{
int  ret = 0;
SCK_HANDLE *sh = NULL;

if (handle==NULL )
{
ret = -1;
printf("func cltSocketSend() err: %d, ((handle==NULL )", ret);
return ret;
}

sh = (SCK_HANDLE *)handle;

if (sh->buf != NULL)
{
free(sh->buf);
sh->buf = NULL;
sh->buflen = 0;
}
free(sh);

return ret;
}

void main()
{
int ret = 0;

void *handle = NULL;

unsigned char buf[1024]; /*in*/
int buflen = 10;

unsigned char out[1024] = {0}; /*in*/
int outlen = 0;

strcpy(buf, "aadd3456789012233ddddddddddddddaaaaaaaaaaa");
//客户端初始化 获取handle上下
//运行的上下文环境
ret = cltSocketInit(&handle/*out*/);
if (ret !=0)
{
printf("func cltSocketInit() err :%d \n", ret);
return ;
}

// 	//客户端发报文
ret = cltSocketSend(handle /*in*/, buf /*in*/,buflen /*in*/);
if (ret !=0)
{
printf("func cltSocketSend() err :%d \n", ret);
return ;
}
//
// 	//客户端收报文
ret = cltSocketRev(handle /*in*/, out /*in*/, &outlen /*in out*/);
if (ret != 0)
{
printf("func cltSocketRev() err :%d \n", ret);
return ;
}
printf("out: %s \n", out);
//
// 	//客户端释放资源
ret = cltSocketDestory(handle/*in*/);
if (ret != 0)
{
printf("func cltSocketDestory() err :%d \n", ret);
return ;
}

system("pause");
}