分享程序员开发的那些事...
更新时间：2021-10-20 01:09:07
新建空项目，命名为RF_Drive,这个作为底层的驱动。
添加MyDrive.c文件，向文件中添加代码，模拟驱动一些函数，代码如下：
思路：
EncData和DecData实现信息的加密和解密，由于不同厂家的设备，加密和解密的方式不同，所以不能在底层驱动中实现，需要不同的厂家在自己的函数库中实现。厂家和驱动约定好相同的接口，将函数通过指针通过调用socketclient_SetEncDataCallback函数，提前将函数存放到Sck_Handle里面。
#define _CRT_SECURE_NO_WARNINGS #include <stdlib.h> #include <string.h> #include <stdio.h> #include "MyDrive.h" typedef struct _Sck_Handle { char version[16]; char ip[16]; int port; unsigned char *p; int len; char *p2; EncData Hw_EncData; }Sck_Handle; int socketclient_SetEncDataCallback(void *handle, EncData Hw_EncData) { int ret = 0; Sck_Handle *tmpHandle = NULL; if (handle == NULL || Hw_EncData == NULL) { ret = -1; printf("func socketclient_SetEncDataCallback() err :%d check handle == NULL err \n", ret); return ret; } tmpHandle = (Sck_Handle *)handle; tmpHandle->Hw_EncData = Hw_EncData;//提前把回调函数的入口地址 缓存到 句柄handle 上下文中 return 0; } int socketclient_init(void **handle) { int ret = 0; Sck_Handle *tmpHandle = NULL; if (handle == NULL) { ret = -1; printf("func socketclient_init() err :%d check handle == NULL err \n", ret); return ret; } tmpHandle = (Sck_Handle *)malloc(sizeof(Sck_Handle)); if (tmpHandle == NULL) { ret = -2; printf("func socketclient_init() err :%d malloc err \n", ret); return ret; } memset(tmpHandle, 0, sizeof(Sck_Handle)); strcpy(tmpHandle->version, "1.0.0.1"); strcpy(tmpHandle->ip, "192.168.12.12"); tmpHandle->port = 8081; //间接赋值 *handle = tmpHandle; return ret; } 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; if (tmpHandle->Hw_EncData != NULL) //如果设置了加密函数 则发送报文之前 先对数据进行加密 { unsigned char crypdata[4096]; int cryptdatalen = 4096; ret = tmpHandle->Hw_EncData(buf, buflen, crypdata, &cryptdatalen); if (ret != 0) { printf("func Hw_EncData() err :%d \n", ret); return ret; } tmpHandle->len = cryptdatalen; tmpHandle->p = (unsigned char *)malloc(cryptdatalen); if (tmpHandle->p == NULL) { ret = -1; printf("func Hw_EncData() err :%d malloc err \n", ret); return ret; } memcpy(tmpHandle->p, crypdata, cryptdatalen); //缓存密文 } else { 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 } return ret; } 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 return ret; } 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; }