我在C(客户端/服务器)中编写了2个小型测试程序,而且我在从服务器向客户端发送消息时遇到问题(但反之亦然)。服务器说它发送了20个字节,但在客户端结束时它表示"无法接收数据"。我将不胜感激任何帮助,非常感谢你!我的代码如下:
服务器:
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netinet/in.h>
int main(int argc, char* argv[])
{
int sockfd, client_sockfd;
struct sockaddr_in server;
int reading, fileSize;
int i; //counter
int bytesSent;
char test[20] = "test message\n";
memset(&server, 0, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(atoi(argv[1])); //assign port to listen to
server.sin_addr.s_addr = INADDR_ANY; //IP address
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) //create socket failed
{
perror("socket");
exit(1);
}
if(bind(sockfd, (struct sockaddr *) &server, sizeof(server)) == -1) //connect server socket to specified port
{
perror("bind call failed");
exit(1);
}
//printf("listening to port %d\n", server.sin_port);
if(listen(sockfd, 5) == -1) //queue size of 5
{
perror("listen call failed");
exit(1);
}
while(1) //infinite loop to process connections from clients
{
client_sockfd = accept(sockfd, NULL, NULL); //accept anything
if(client_sockfd == -1)
perror("accept call failed");
bytesSent = send(client_sockfd, test, 20, 0);
printf("bytes sent: %d\n", bytesSent);
}
close(client_sockfd);
close(sockfd);
return 0;
}
客户端:
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <fcntl.h>
#include <errno.h>
int main(int argc, char* argv[])
{
int sockfd;
struct sockaddr_in server;
struct hostent *server_ip_address;
server_ip_address = gethostbyname("eos-class.engr.oregonstate.edu");
int sent; //number of bytes sent
int received; //number of bytes received
char passedMsg[20]; //holds received message
if(server_ip_address == NULL)
{
fprintf(stderr, "could not resolve server host name\n");
exit(1);
}
memset(&server, 0, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(atoi(argv[3])); //assign port to connect to
memcpy(&server.sin_addr, server_ip_address->h_addr, server_ip_address->h_length);
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) //create socket failed
{
perror("socket");
exit(1);
}
if(connect(sockfd, (struct sockaddr *) &server, sizeof(server)) == -1) //connect socket to remote address failed
{
printf("tried to connect to port %d\n", server.sin_port);
perror("connect");
exit(1);
}
if((received = recv(sockfd, passedMsg, 20, 0)) < 0);
{
printf("Failed to receive data\n");
exit(1);
}
printf("Received message: %s\n", passedMsg);
close(sockfd);
return 0;
}
答案 0 :(得分:1)
在您的客户端代码中,在recv
的错误检查中,将printf
更改为perror
。如果这样做,输出将是:
无法接收数据:成功
所以recv
调用成功,但错误代码仍在运行。为什么?让我们仔细看看if
声明:
// what's this? ----v
if((received = recv(sockfd, passedMsg, 20, 0)) < 0);
{
printf("Failed to receive data\n");
exit(1);
}
在;
语句中的条件之后有一个迷路if
。这意味着如果条件为真,if
语句不执行任何操作,并且以下块不是if
的主体,而是始终运行的独立块。
摆脱额外的;
并获得预期的结果。