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");
}