Windows 7中的UDP广播 - 它有效吗？

Question

我正在尝试在Windows 7下编写一些代码,以便通过我的本地网络进行广播,并且无法使用以下代码.我来自Linux背景,所以道歉 - 完整的代码编译等工作,如果我使用的地址:

unsigned long broadcastAddr = inet_addr("192.168.10.0") | ~(inet_addr("255.255.240.0"));

然后工作正常,我只是想使用首选的INADDR_BROADCAST/255.255.255.255方法.

<snip>
SOCKET sockfd;
int broadcast = 1;

WSADATA wsaData;    // Windows socket

// Initialize Winsock
if (WSAStartup(MAKEWORD(2,2), &wsaData) == SOCKET_ERROR) {
    perror("WinSock Error");
    getc(stdin);
    exit(EXIT_FAILURE);
}
if ((sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1) {
    perror("Socket Error");
    getc(stdin);
        exit(1);
}

if ((setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, (char *)&broadcast, sizeof(broadcast))) == SOCKET_ERROR) {
    perror("Setsockopt - SOL_SOCKET");
    getc(stdin);
    exit(1);
}

struct sockaddr_in recvaddr;
recvaddr.sin_family = AF_INET;
recvaddr.sin_port = htons(PORT);
recvaddr.sin_addr.s_addr = htonl(INADDR_BROADCAST);
memset(recvaddr.sin_zero,'\0', sizeof(recvaddr.sin_zero));

int numbytes = 0;
while ((numbytes = sendto(sockfd, greet, strlen(greet) , MSG_DONTROUTE, (struct sockaddr *)&recvaddr, sizeof(struct sockaddr_in))) != -1) {
        printf("Sent a packet %d\n", numbytes);
        Sleep(100);
}

Answer 1

有一个在Windows 7中对UDP广播一个巨大的错误,这使得在255.255.255.255广播上不起作用大多数的Windows 7安装:https://serverfault.com/questions/72112/how-to-alter-the-global-broadcast-地址255-255-255-255 -行为-在窗口

基本上它只会在单个网络接口上发送广播,这可能是任何东西,甚至像VM网络接口或蓝牙接口,它最终可能不会广播到任何设备.