之前写的服务器端 表示都无法收到client发的数据,找不到原因,原来是有个socket接收数据缓冲木有设置,现在设置后就可以正常收到数据啦!
server端:
#include <winsock.h> #include <stdio.h> #include <string> #pragma comment(lib, "ws2_32.lib") #define MYPORT 1234 // the port users will be connecting to #define BACKLOG 5 // how many pending connections queue will hold #define BUF_SIZE 200 int fd_A[BACKLOG]; // accepted connection fd int conn_amount; // current connection amount void showclient() { int i; printf("client amount: %d ", conn_amount); for (i = 0; i < BACKLOG; i++) { printf("[%d]:%d ", i, fd_A[i]); } printf(" "); } int main(void) { WSADATA wsaData; WSAStartup(0x0202, &wsaData); int sock_fd, new_fd; // listen on sock_fd, new connection on new_fd struct sockaddr_in server_addr; // server address information struct sockaddr_in client_addr; // connector's address information int sin_size; int yes = 1; char buf[BUF_SIZE]; int ret; int i; if ((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("socket"); exit(1); } //这一步很重要,不然数据可能收不到 int nRecvBuf = 32 * 1024; //设置为32K if (setsockopt(sock_fd,SOL_SOCKET,SO_RCVBUF,(const char*)&nRecvBuf,sizeof(int)) == -1) { perror("setsockopt"); exit(1); } server_addr.sin_family = AF_INET; // host byte order server_addr.sin_port = htons(MYPORT); // short, network byte order server_addr.sin_addr.s_addr = INADDR_ANY; // automatically fill with my IP memset(server_addr.sin_zero, '