在Windows中的套接字上有一篇有趣的文章使用fprintf，建议将fprintf替换为将格式化缓冲区发送到套接字的包装器。
但是，似乎可以使用_open_osfhandle将套接字转换为filedescriptor。
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <windows.h>
int main(int argc, char* argv[])
{
if (argc < 3)
{
fprintf(stderr,"usage %s <hostname> <port>\n", argv[0]);
exit(0);
}
WSADATA wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);
int port = atoi(argv[2]);
struct hostent *server = gethostbyname(argv[1]);
if (server == NULL)
{
fprintf(stderr,"ERROR, no such host\n");
exit(0);
}
struct sockaddr_in serv_addr;
memset(&serv_addr, 0, sizeof(struct sockaddr_in));
memcpy((char *)&serv_addr.sin_addr.s_addr, (char *)server->h_addr, server->h_length);
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(port);
int sock = socket(AF_INET, SOCK_STREAM, 0);
if(sock == -1)
{
perror("socket");
exit(0);
}
int result = connect(sock, (struct sockaddr*)&serv_addr, sizeof(struct sockaddr_in));
if(result == -1)
{
perror("connect");
exit(0);
}
int OSFileHandle = _open_osfhandle(sock, _O_APPEND);
FILE * fd = fdopen(OSFileHandle, "w+");
if (fd == NULL)
{
perror("fdopen");
exit(0);
}
fprintf(fd, "Hello World\r\n");
fclose(fd);
closesocket(sock);
WSACleanup();
}
使用此代码连接到服务器（例如nc -l -p）不起作用。什么都没收到，netcat刚退出。
MSDN文档说The socket that is created will have the overlapped attribute as a default
使用WSASocket来创建没有WSA_FLAG_OVERLAPPED标志的套接字可以解决此问题：
int sock = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, 0);
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