C/C++远程开机

 // 2C:4D:54:ED:08:F0
 #include <stdio.h>
 #include <Windows.h>
 #include <winsock.h>

 #pragma comment(lib,"Ws2_32.lib")

 /*
     从文件通过ip获取mac
     ip:欲取ip的mac地址
     成功返回对应mac,否则返回NULL.
 */
 unsigned char *GetfileMacforIp(char *ip);
 /*
     远程唤醒
     mac:目标mac地址
     ps:在此之前要确保目标主板支持远程唤醒
 */
 VOID RemoteStart(unsigned char *mac);

 int main(void)
 {
     unsigned char *mac = GetfileMacforIp("172.18.1.6");
     if (mac)
     {
         printf("%X-%X-%X-%X-%X-%X\n", mac[], mac[], mac[], mac[], mac[], mac[]);
         //free(mac); 为什么无法free?
     }
     system("pause");
     return ;
 }

 VOID RemoteStart(unsigned char *mac)
 {
     // 存封包数据,格式为：6个0xFF为一组,16个mac地址为一组.mac地址正好是6个字节,封包总大小=6+16*6=102
     unsigned char packet[] = {  };
     struct sockaddr_in addr;
     int sockfd, i, j;
     const char on = ;
     WSADATA aaa;

     // 填充封包数据
     for (i = ; i < ; i++)
         packet[i] = 0xFF;
     for (i = ; i < ; i++)
     {
         for (j = ; j < ; j++)
         {
             packet[i *  + j] = mac[j];
         }
     }
     // 使用socket发送封包前必须初始化socket
     WSAStartup(MAKEWORD(, ), &aaa);
     // udp方式
     sockfd = socket(AF_INET, SOCK_DGRAM, );
     setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on));
     if (sockfd < )
     {
         printf("setsockopt filed!\n");
         return;
     }
     memset(&addr, , sizeof(addr));
     addr.sin_family = AF_INET;
     addr.sin_port = htons();
     // 广播地址:255.255.255.255
     addr.sin_addr.S_un.S_addr = inet_addr("255.255.255.255");
     sendto(sockfd, (const char *)packet, sizeof(packet), , (struct sockaddr *)&addr, sizeof(addr));
     WSACleanup();
 }

 unsigned char *GetfileMacforIp(char *ip)
 {
     char tmp[] = {  };
     char *pos = NULL;
     char mac[] = {  };
     unsigned char *mac1 = (unsigned char*)malloc(sizeof(unsigned char)*);
     //unsigned char mac1[6] = { 0 };

     FILE *wj = NULL;
     fopen_s(&wj, "ipmac.txt", "r");
     if (!wj)
     {
         printf("file can`t open!\n");
         return ;
     }
     while (!feof(wj))
     {
         memset(tmp, , );
         fgets(tmp, , wj);
         pos = strstr(tmp, ip);
         if (pos)
         {
             // 文本形式Mac地址
             memmove(mac, tmp + strlen(ip) + , );
             // 转字节形式Mac地址
             sscanf_s(mac, "%x-%x-%x-%x-%x-%x", &mac1[], &mac1[], &mac1[], &mac1[], &mac1[], &mac1[]);
             //printf("%X %X %X %X %X %X\n",mac1[0],mac1[1],mac1[2],mac1[3],mac1[4],mac1[5]);
             break;
         }
     }
     fclose(wj);
     return mac1;
 }

核心函数是RemoteStart，GetfileMacforIp是我在本地存放的一个ip和mac地址的数据文件。