主题森林wordpress/关键字优化

我试图使用unix套接字测试发送一些udp数据包到localhost.

我的理解是,当设置ip地址和端口以便发送数据包时,我会将我的sockaddr_inwith填充为转换为网络字节顺序的值.

我在OSX上,我对此感到惊讶

printf("ntohl: %d\n", ntohl(4711));

printf("htonl: %d\n", htonl(4711));

printf("plain: %d\n", 4711);

打印

ntohl: 1729232896

htonl: 1729232896

plain: 4711

所以这两个函数都没有实际返回普通值.我希望看到结果不同,因为x86是little-endian(afaik),或者与实际数字4711相同且相同.显然我不明白htonl和ntohl及其变体的作用.我错过了什么？

相关代码是这样的：

int main(int argc, char *argv[])

{

if (argc != 4)

{

fprintf(stderr, "%s\n", HELP);

exit(-1);

}

in_addr_t rec_addr = inet_addr(argv[1]); // first arg is '127.0.0.1'

in_port_t rec_port = atoi(argv[2]); // second arg is port number

printf("Address is %s\nPort is %d\n", argv[1], rec_port);

char* inpath = argv[3];

char* file_buf;

unsigned long file_size = readFile(inpath, &file_buf); // I am trying to send a file

if (file_size > 0)

{

struct sockaddr_in dest;

dest.sin_family = AF_INET;

dest.sin_addr.s_addr = rec_addr; // here I would use htons

dest.sin_port = rec_port;

printf("ntohs: %d\n", ntohl(4711));

printf("htons: %d\n", htonl(4711));

printf("plain: %d\n", 4711);

int socket_fd = socket(AF_INET, SOCK_DGRAM, 0);

if (socket_fd != -1)

{

int error;

error = sendto(socket_fd, file_buf, file_size + 1, 0, (struct sockaddr*)&dest, sizeof(dest));

if (error == -1)

fprintf(stderr, "%s\n", strerror(errno));

else printf("Sent %d bytes.\n", error);

}

}

free(file_buf);

return 0;

}