c socket revcv收到截断字符串

-1

我有一个客户端服务器套接字应用程序。客户端正在发送一些服务器在标准输出上打印的文本。我所介绍的问题是，rcv函数只接收文本的一部分。发送的字符串在第五个字符处被截断。c socket revcv收到截断字符串

我该如何解决这个问题？有人能帮帮我吗？

server.c

#if defined WIN32 
#include <winsock.h> 
#else 
#define closesocket close 
#include <sys/socket.h> 
#include <arpa/inet.h> 
#include <unistd.h> 
#include <netdb.h> 
#endif 

#define SERVERADDRESS "10.10.10.10" 
#define PROTOCOLPORT 45678 
#define MAXCONNESSIONI 10 

#define MAXBUFFERSIZE 256 

#include <stdio.h> 
#include <stdlib.h> 



void errorManager(const char* messaggioErrore) 
{ 
    const char* erroreString="\nError: "; 

    printf (erroreString); 
    printf (messaggioErrore); 
    printf ("\n"); 
} 

void clearWinsock() 
{ 
#if defined WIN32 
    WSACleanup(); 
#endif 
} 


int main(int argc, char** argv) { 

#if defined WIN32 

    WSADATA wsaData; 
    int iResult=WSAStartup(MAKEWORD(2,2),&wsaData); 

    if (iResult!=0) 
    { 
     errorManager("Error WSASTARTUP"); 
     return 0; 
    } 
#endif 



    char buffer[MAXBUFFERSIZE]; 
    char* Nome; 



    int serverSocket; 
    serverSocket=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP); 


    struct sockaddr_in serverSocketAddress; 
    serverSocketAddress.sin_family=AF_INET; 
    serverSocketAddress.sin_addr.s_addr=inet_addr(SERVERADDRESS); 
    serverSocketAddress.sin_port=htons(PROTOCOLPORT); 


    if (bind(serverSocket,(struct sockaddr*)&serverSocketAddress,sizeof(serverSocketAddress))<0) 
    { 

     errorManager("bind failed."); 

     closesocket(serverSocket); 
     clearWinsock(); 
     return EXIT_FAILURE; 
    } 


    if (listen(serverSocket,MAXCONNESSIONI)<0) 
    { 

     errorManager("listen failed."); 

     closesocket(serverSocket); 
     clearWinsock(); 
     return EXIT_FAILURE; 
    } 




    int clientSocket; 
    struct sockaddr_in clientSocketAddress; 
    int clientSocketAddressLength; 
    clientSocketAddressLength=sizeof(clientSocketAddress); 




    while(1) 
    { 

     printf ("Waiting for client connections...\n"); 

     if ((clientSocket=accept(serverSocket,(struct sockaddr*)&clientSocketAddress,&clientSocketAddressLength))<0) 
     { 

      errorManager("accept failed."); 

      closesocket(serverSocket); 
      clearWinsock(); 
      return EXIT_FAILURE; 
     } 

     printf("Connection from client %s:%i accepted.\n",inet_ntoa(clientSocketAddress.sin_addr),ntohs(clientSocketAddress.sin_port)); 


     memset(buffer,0,sizeof(buffer)); 
     if ((recv(clientSocket,buffer,MAXBUFFERSIZE,0))<0) 
     { 

      errorManager("recv failed."); 

      closesocket(serverSocket); 
      clearWinsock(); 
      return EXIT_FAILURE; 
     } 

     Name=buffer; 

     printf("Name: %s\n",Name); 



     ///ECHO 
     if ((send(clientSocket,Name,sizeof(Name),clientSocketAddressLength))!=sizeof(Name)) 
     { 

      errorManager("send failed."); 

      closesocket(serverSocket); 
      clearWinsock(); 
      return EXIT_FAILURE; 
     } 


     closesocket(clientSocket); 
    } 

    printf("Terminating server..."); 


    closesocket(serverSocket); 
    clearWinsock(); 
    return EXIT_SUCCESS; 


}

client.c

#if defined WIN32 
#include <winsock.h> 
#else 
#define closesocket close 
#include <sys/socket.h> 
#include <arpa/inet.h> 
#include <unistd.h> 
#include <netdb.h> 
#endif 



#include <stdio.h> 
#include <stdlib.h> 



#define DEFAULTSERVERADDRESS "10.10.10.10" 
#define DEFAULTPROTOCOLPORT 45678 

#define MAXBUFFERSIZE 256 


void ErrorManager(const char* messaggioErrore) 
{ 
    const char* erroreString="\nError: "; 

    printf (erroreString); 
    printf (messaggioErrore); 
    printf ("\n"); 
} 

void clearWinsock() 
{ 
#if defined WIN32 
    WSACleanup(); 
#endif 
} 


int main(int argc, char** argv) { 

    char* serverAddress; 
    int serverPort; 


    if (argc>1) 
    { 
     serverAddress=argv[1]; 

     if (argc>2) 
     { 
      serverPort=atoi(argv[2]); 
     } 
     else 
     { 
      serverPort=DEFAULTPROTOCOLPORT; 
     } 
    } 
    else 
    { 
     serverAddress=DEFAULTSERVERADDRESS; 
     serverPort=DEFAULTPROTOCOLPORT; 
    } 

#if defined WIN32 

    WSADATA wsaData; 
    int iResult=WSAStartup(MAKEWORD(2,2),&wsaData); 

    if (iResult!=0) 
    { 
     ErrorManager("Error WSASTARTUP"); 
     return 0; 
    } 

#endif 



    int clientSocket; 
    clientSocket=socket(PF_INET,SOCK_STREAM, IPPROTO_TCP); 



    struct sockaddr_in serverSocketAddress; 
    serverSocketAddress.sin_family=AF_INET; 
    serverSocketAddress.sin_addr.s_addr=inet_addr(serverAddress); 
    serverSocketAddress.sin_port=htons(serverPort); 

    if (connect(clientSocket,(struct sockaddr*)&serverSocketAddress,sizeof(serverSocketAddress))<0) 
    { 

     ErrorManager("connect failed."); 

     closesocket(clientSocket); 
     clearWinsock(); 
     return EXIT_FAILURE; 
    } 

    const char* Name="SOMETEXT TO SEND OVER"; 


    if (send(clientSocket,Name,sizeof(Name),0)!=sizeof(Name)) 
    { 

     ErrorManager("send failed."); 

     closesocket(clientSocket); 
     clearWinsock(); 
     return EXIT_FAILURE; 
    } 

    printf("client ha inviato: %s",Name); 





    char buffer[MAXBUFFERSIZE]; 
    if (recv(clientSocket,buffer,MAXBUFFERSIZE,0)<0) 
    { 

     ErrorManager("recv failed."); 

     closesocket(clientSocket); 
     clearWinsock(); 
     return EXIT_FAILURE; 
    } 

    char *Name1=buffer; 
    printf("Name: %s/n",Name1); 






    clearWinsock(); 
    closesocket(clientSocket); 
    return EXIT_SUCCESS; 
}

我使用MinGW的。

来源

2014-07-02 geraldCelente

检查你的returnvalu从的send（）和recv（），并用它来估计的howmany个字节被送到/收到。 – wildplasser

@Downvoter我可以问downvote的原因吗？ – geraldCelente

@geraldCelente我不是一个倒票，但我的猜测是：太多的代码，太少的努力来孤立你自己的问题。 – unwind

在客户端代码中你有

const char* Name="SOMETEXT TO SEND OVER"; 

if (send(clientSocket,Name,sizeof(Name),0)!=sizeof(Name)) 
          ^   ^
          |...............|    | 
          | 
           ...... //Wrong. need strlen(Name)+1

来源

2014-07-02 13:01:56

'strlen（Name）+ 1'因为''\ 0'' – mch

绝对正确;尽管如此，我们不能期望通过一次'recv（）'调用来发送所有数据（特别是如果客户端和服务器运行在不同的机器上）。在循环中调用'recv（）'可能仍然是必需的 –

c socket revcv收到截断字符串

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