c - 我在套接字程序中得到了一个奇怪的词 'Received: 艎��'

Question

我编写了一个服务器程序和一个客户端程序，这些程序与linux ubuntu上的套接字进行通信。客户端程序输出Received: 艎��这是我的服务器代码:

/*** tcp_server.c ***/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

int main() {
    int sock_fd, new_fd, bytes;
    struct sockaddr_in seraddr, cliaddr;
    char data[1024];
    socklen_t cli_addr_size;
    cli_addr_size = sizeof(cliaddr);

    sock_fd = socket(AF_INET, SOCK_STREAM, 0);

    memset(&seraddr, 0, sizeof(seraddr));
    seraddr.sin_family = AF_INET;
    seraddr.sin_addr.s_addr = htonl(INADDR_ANY); // INADDR_ANY : It received Network Interface that connected server defined interface, htonl :  
    seraddr.sin_port = htons(5050);
    bind(sock_fd, (struct sockaddr *)&seraddr, sizeof(seraddr));
    listen(sock_fd, 10);
    while (1) {
        new_fd = accept(sock_fd, (struct sockaddr *)&cliaddr, &cli_addr_size);
        bytes = recv(new_fd, data, 1024, 0);
        send(new_fd, data, bytes, 0);
        close(new_fd);
    }   

    close(sock_fd);
}

我的客户代码是:

/*** tcp_client.c ***/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

int main(int argc, char *argv[]) {
    int sock_fd, bytes;
    struct sockaddr_in ser_addr;
    char *snddata, rcvdata[1024];

    snddata = argv[2];
    sock_fd = socket(AF_INET, SOCK_STREAM, 0);

    memset(&ser_addr, 0,sizeof(ser_addr));
    ser_addr.sin_family = AF_INET;
    ser_addr.sin_addr.s_addr = inet_addr(argv[1]); // INADDR_ANY : It received Network Interface that connected server defined interface, htonl :  
    ser_addr.sin_port = htons(5050);
    connect(sock_fd, (struct sockaddr *)&ser_addr, sizeof(ser_addr));
    send(sock_fd, snddata, strlen(snddata), 0);
    printf("Received: ");
    
    bytes = recv(sock_fd, rcvdata, 1024, 0);
    rcvdata[bytes] = '\0';
    printf("%s\n", rcvdata);

    close(sock_fd);
}

首先，我收到了 accept的参数3的错误，然后我更改了

        new_fd = accept(sock_fd, (struct sockaddr *)&cliaddr, sizeof(cliaddr);

但是它仍然产生这个奇怪的词。

Answer 1

尝试更改send()和receive()函数，以便完全控制从缓冲区(data[1024])发送多少个字节和，例如此线程:C socket: recv and send all data，另请参阅Beej的网络编程指南( http://beej.us/guide/bgnet/ )
还要确保初始化数据缓冲区:

data[1024] = "";
rcvdata[1024] = "";

或者

 data[1024];
 data[0] = '\0';
 rcvdata[1024];
 rcvdata[0] = '\0';

，背景位于此线程中:Why I am getting this unusually symbols by printing char string