c - 如何使用 tcp/ip 在两台不同计算机之间运行客户端服务器通信？

Question

如何使用 tcp/ip 在两个不同系统之间建立客户端-服务器通信？我已经完成了服务器和客户端的代码，但是当我运行代码时，没有错误，而且我看不到该文件。我附上代码以供进一步引用。

服务器代码:

#include<stdio.h>
#include<string.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<arpa/inet.h>   
#include<stdlib.h>
#include<sys/ioctl.h> 
#include<stdarg.h>
#include<setjmp.h>
#include<errno.h>
#include<assert.h>

//using namespace std;

long long int  send_audio(long long int socket)

{

    FILE *audio;
    long long int size, read_size, stat, packet_index;
    char send_buffer[1024000], read_buffer[1024000];
    packet_index = 1;

    audio = fopen("/home/sosdt009/Desktop/ROBO.mp3", "r");

    printf("Getting audio Size\n");

    if(audio == NULL)

    {

        printf("Error Opening audio File");
    }

    fseek(audio, 0, SEEK_END);
    size = ftell(audio);
    fseek(audio, 0, SEEK_SET);
    printf("Total audio size: %lli \n", size);

    //Send audio Size

    printf("Sending audio Size\n");
    write(socket, (void *)&size, sizeof(int));

    //Send audio as Byte Array

    printf("Sending audio as Byte Array\n");

    do
    {

        //Read while we get errors that are due to signals.

        stat = read(socket, &read_buffer, 255);
        printf("Bytes read: %lli \n", stat);

    }

    while(stat < 0);

    printf("Received data in socket\n");
    printf("Socket data: %s\n", read_buffer);

    while(!feof(audio))

    {

        //while(packet_index = 1){
        //Read from the file into our send buffer

        read_size = fread(send_buffer, 1, sizeof(send_buffer) - 1, audio);

        //Send data through our socket 

        do

        {

            stat = write(socket, send_buffer, read_size);

        }

        while(stat < 0);

        printf("Packet Number: %lli \n", packet_index);
        printf("Packet Size Sent: %lli \n", read_size);
        printf(" \n");
        printf(" \n");


        packet_index++;

        //Zero out our send buffer

        bzero(send_buffer, sizeof(send_buffer));

    }

}

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

{
    long long int socket_desc, new_socket, c, read_size, buffer = 0;
    struct sockaddr_in server, client;
    char *readin;

    //Create socket

    socket_desc = socket(AF_INET, SOCK_STREAM, 0);
    if(socket_desc == -1)

    {

        printf("Could not create socket");

    }

    //Prepare the sockaddr_in structure

    server.sin_family = AF_INET;
    server.sin_addr.s_addr = INADDR_ANY;
    server.sin_port = htons(6888);

    //Bind

    if(bind(socket_desc, (struct sockaddr *)&server, sizeof(server)) < 0)

    {

        puts("bind failed");
        return 1;

    }

    puts("Bind completed");

    //Listen

    listen(socket_desc, 3);

    //Accept and incoming connection

    puts("Waiting for incoming connections...");
    c = sizeof(struct sockaddr_in);

    if((new_socket = accept(socket_desc, (struct sockaddr *)&client, (socklen_t *)&c)))

    {

        puts("Connection accepted");

    }

    fflush(stdout);

    if(new_socket < 0)

    {

        perror("Accept Failed");
        return 1;

    }

    send_audio(new_socket);

    close(socket_desc);
    fflush(stdout);
    return 0;
}       

客户端代码:

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

//using namespace std;

//This function is to be used once we have confirmed that an audio is to be sent //It should read and output an audio file

long long int receive_audio(long long int socket)

{

    long long int buffersize = 0, recv_size = 0, size = 0, read_size, write_size;

    char audioarray[1024000], verify = '1', errno;

    FILE *audio;

    //Find the size of the audio

    read(socket, &size, sizeof(int));

    //Send our verification signal

    write(socket, &verify, sizeof(char));

    //Make sure that the size is bigger than 0

    if(size <= 0)

    {

        printf("Error has occurred. Size less than or equal to 0 \n");      return -1;

    }

    audio = fopen("/home/sosdt009/Desktop/received.mp3", "w");

    if(audio == NULL)

    {

        printf("Error has occurred. audio file could not be opened \n");        return -1;

    }

    //Loop while we have not received the entire file yet

    while(recv_size < size)

    {

        ioctl(socket, FIONREAD, &buffersize);

        //We check to see if there is data to be read from the socket    

        if(buffersize > 0)

        {

            if(read_size = read(socket, audioarray, buffersize) < 0){
                printf("%s", strerror(errno));

            }

            //Write the currently read data into our audio file

            write_size = fwrite(audioarray, 1, (buffersize), audio);

            /* if(write_size != buffersize)

             {

             printf("write and buffer sizes are wrong \n");

             }

             if(read_size != write_size)

             {

             printf("error in read write \n");

             }  */

            //Increment the total number of bytes read

            recv_size += read_size;

            //Send our handshake verification info

            write(socket, &verify, sizeof(char));

        }   }

    fclose(audio);  printf("audio successfully Received! \n");  return 1; }

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

    long long int socket_desc;  struct sockaddr_in server;  char *parray, errno;


    //Create socket

    socket_desc = socket(AF_INET, SOCK_STREAM, 0);

    if(socket_desc == -1)

    {

        printf("Could not create socket \n");

    }

    memset(&server, 0, sizeof(server));     server.sin_addr.s_addr = ("10.170.0.40");;  server.sin_family = AF_INET;    server.sin_port = htons(6888);

    //Connect to remote server

    if(connect(socket_desc, (struct sockaddr *)&server, sizeof(server)) < 0)

    {


        //   printf(strerror(errno));

        close(socket_desc);

        printf("Connect Error \n");

        return -1;  }

    puts("Connected \n");

    receive_audio(socket_desc);

    close(socket_desc);

    return 0; }

Answer 1

while (stat < 0); → while (stat > 0); – 乔普