通过C++套接字发送图像(Linux)

Question

我试图通过套接字发送文件.我创建了一个程序,它适用于.cpp,.txt和其他文本文件等文件类型.但是二进制文件,图像(.jpg,.png)和压缩文件(如.zip和.rar)未正确发送.我知道这与文件的大小无关,因为我测试了大的.txt文件.我不知道问题,我收到所有发送的字节,但文件无法打开.大多数情况下文件已损坏且无法查看.我已经通过谷歌搜索了一个解决方案,并且发现其他人遇到了同样的问题并没有解决方案.所以通过帮助我,你也在帮助其他需要解决方案的人.

服务器代码:

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

int main ( int agrc, char *argv[] )
{
    /******** Program Variable Define & Initialize **********/
    int Main_Socket;    // Main Socket For Server
    int Communication_Socket; // Socket For Special Clients
    int Status; // Status Of Function
    struct sockaddr_in Server_Address; // Address Of Server
    struct sockaddr_in Client_Address;// Address Of Client That Communicate with Server
    int Port;
    char Buff[100] = "";
    Port = atoi(argv[2]);
    printf ("Server Communicating By Using Port %d\n", Port);
    /******** Create A Socket To Communicate With Server **********/
    Main_Socket = socket ( AF_INET, SOCK_STREAM, 0 );
    if ( Main_Socket == -1 )
    {
            printf ("Sorry System Can Not Create Socket!\n");
    }
    /******** Create A Address For Server To Communicate **********/
    Server_Address.sin_family = AF_INET;
    Server_Address.sin_port = htons(Port);
    Server_Address.sin_addr.s_addr = inet_addr(argv[1]);
    /******** Bind Address To Socket **********/
    Status = bind ( Main_Socket, (struct sockaddr*)&Server_Address, sizeof(Server_Address) );
    if ( Status == -1 )
    {
            printf ("Sorry System Can Not Bind Address to The Socket!\n");
    }
    /******** Listen To The Port to Any Connection **********/        
    listen (Main_Socket,12);    
    socklen_t Lenght = sizeof (Client_Address);
    while (1)
    {
        Communication_Socket = accept ( Main_Socket, (struct sockaddr*)&Client_Address, &Lenght );

        if (!fork())
        {

            FILE *fp=fopen("recv.jpeg","w");
            while(1)
            {
                char Buffer[2]="";
                if (recv(Communication_Socket, Buffer, sizeof(Buffer), 0))
                {
                    if ( strcmp (Buffer,"Hi") == 0  )
                    {
                        break;
                    }
                    else
                    {
                        fwrite(Buffer,sizeof(Buffer),1, fp);
                    }
                }
            }
            fclose(fp);
            send(Communication_Socket, "ACK" ,3,0);
            printf("ACK Send");
            exit(0);
        }
    }
    return 0;
}

客户代码:

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

int main ( int agrc, char *argv[] )
{
    int Socket;

    struct sockaddr_in Server_Address;  
    Socket = socket ( AF_INET, SOCK_STREAM, 0 );
    if ( Socket == -1 )
    {   
        printf ("Can Not Create A Socket!");    
    }
    int Port ;
    Port = atoi(argv[2]);   
    Server_Address.sin_family = AF_INET;
    Server_Address.sin_port = htons ( Port );
    Server_Address.sin_addr.s_addr = inet_addr(argv[1]);
    if ( Server_Address.sin_addr.s_addr == INADDR_NONE )
    {
        printf ( "Bad Address!" );
    }   
    connect ( Socket, (struct sockaddr *)&Server_Address, sizeof (Server_Address) );


    FILE *in = fopen("background.jpeg","r");
    char Buffer[2] = "";
    int len;
    while ((len = fread(Buffer,sizeof(Buffer),1, in)) > 0)
    {            
        send(Socket,Buffer,sizeof(Buffer),0);            
    }
    send(Socket,"Hi",sizeof(Buffer),0);

    char Buf[BUFSIZ];
    recv(Socket, Buf, BUFSIZ, 0);
    if ( strcmp (Buf,"ACK") == 0  )
    {
         printf("Recive ACK\n");
    }        
    close (Socket);
    fclose(in);
    return 0;   
}

Answer 1

对于读取 ascii 文本文件，char缓冲区是可以接受的。

要读取二进制数据，您需要使用unsigned char，否则您的数据将被破坏，因为二进制数据是无符号字节。