Question

这个我的聊天与线程混合在一起运行服务器和聊天。问题是，当我向聊天发送消息时，让“Hello”作为第一条消息，和“再见”作为第二个输出将：你好 Byelo和一些我不想要的额外角色如何删除聊天的额外字符和字母？ C ++ 我试过cout＆lt;＆lt;“消息：”＆lt;

但它似乎无法正常工作

#include <windows.h>
#include <winsock2.h>
#include <stdio.h>
#include <iostream>
#include <cpl.h>
#include <string>
using namespace std;

DWORD WINAPI Thread(LPVOID);
HANDLE Thread_Handle = NULL;
DWORD Thread_ID      = 0;

DWORD WINAPI Thread(LPVOID data)
{

    while(1){        
    WSADATA t_wsa; // WSADATA structure
    WORD wVers; // version number
    int iError; // error number

    wVers = MAKEWORD(2, 2); // Set the version number to 2.2
    iError = WSAStartup(wVers, &t_wsa); // Start the WSADATA


if(iError != NO_ERROR || iError == 1){
    //  MessageBox(NULL, (LPCTSTR)"Error at WSAStartup()", (LPCTSTR)"Server::Error", MB_OK|MB_ICONERROR);
        WSACleanup();

    }

    if(LOBYTE(t_wsa.wVersion) != 2 || HIBYTE(t_wsa.wVersion) != 2){
   // MessageBox(NULL, (LPCTSTR)"Error at WSAStartup()", (LPCTSTR)"Server::Error", MB_OK|MB_ICONERROR);
        WSACleanup();

    }

    SOCKET sServer;
    sServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); 
    if(sServer == INVALID_SOCKET || iError == 1){
    //  MessageBox(NULL, (LPCTSTR)"Invalid Socket!", (LPCTSTR)"Server::Error", MB_OK|MB_ICONERROR);
        WSACleanup();

    }


    SOCKADDR_IN sinServer;
    memset(&sinServer, 0, sizeof(sinServer));

    sinServer.sin_family = AF_INET;
    sinServer.sin_addr.s_addr = INADDR_ANY; // Where to start server?
    sinServer.sin_port = htons( 1002); // Port



    if(bind(sServer, (LPSOCKADDR)&sinServer, sizeof(sinServer)) == SOCKET_ERROR){
        /* failed at starting server */
    //  MessageBox(NULL, (LPCTSTR)"Could not bind the server!", (LPCTSTR)"Server::Error", MB_OK|MB_ICONERROR);
        WSACleanup();

    }
    while(listen(sServer, 20) == SOCKET_ERROR){
    Sleep(10);

}



  SOCKET sClient;
    int szlength;

    szlength = sizeof(sinServer);
    sClient = accept(sServer, (LPSOCKADDR)&sinServer, &szlength);
    if (sClient == INVALID_SOCKET){
    //  MessageBox(NULL, (LPCTSTR)"Could not accept this client!", (LPCTSTR)"Server::Error", MB_OK|MB_ICONERROR);
    closesocket(sServer);
        WSACleanup();
    } else {
   // MessageBox(NULL, (LPCTSTR)"Accepted a Client!", (LPCTSTR)"Server::Success", MB_OK);
  }
  // Now we can send/recv data!

    int iRet;
    char buffer[200];
//  strcpy(buffer, "Welcome to our Server!\0");
    iRet = send(sClient, buffer, strlen(buffer), 0); 
    if(iRet == SOCKET_ERROR){
        //MessageBox(NULL, (LPCTSTR)"Could not send data!", (LPCTSTR)"Server::Error", MB_OK|MB_ICONERROR);
        closesocket(sClient);
    closesocket(sServer);
        WSACleanup();

    }
    char autoresponse[80];
    int bytes;
//  strcpy(autoresponse, "Message Received!");
    autoresponse[strlen(autoresponse)-1] = 0;
    //MessageBox(NULL, (LPCTSTR)"Server is ready for messages and is hiding!", (LPCTSTR)"Server::Success", MB_OK);
    char *cClientMessage;
    cClientMessage = new char[600];
    cClientMessage[599] = 0;
  while(bytes = recv(sClient, cClientMessage, 599, 0)){

    if(bytes < 1){

      continue;
    }
char cRead[99];///////////////////////////////////////////////////////////////////



     cout<<"Message: "<<cClientMessage<<"       \n";     




      /////////////////////////////////////////////////////////////////////////////

        iRet = send(sClient, autoresponse, strlen(autoresponse), 0); 
        if(iRet == SOCKET_ERROR){
        //  MessageBox(NULL, (LPCTSTR)"Could not send response!", (LPCTSTR)"Server::Error", MB_OK|MB_ICONERROR);
      }}

  delete [] cClientMessage;
    // Cleanup
    closesocket(sClient);
    closesocket(sServer);
    // Shutdown Winsock
    WSACleanup();


Sleep(10);
}
    return (0);
}

int main()
{
    Thread_Handle = CreateThread(NULL,0,Thread,(LPVOID)0,0,&Thread_ID);


    while(1){

char IP[100];
char message[255];
cout<<"IP: \n";
cin>>IP;                    

char buffer[150];
    WSADATA t_wsa; // WSADATA structure
    WORD wVers; // version number
    int iError; // error number

    wVers = MAKEWORD(2, 2); // Set the version number to 2.2
    iError = WSAStartup(wVers, &t_wsa); // Start the WSADATA

    if(iError != NO_ERROR || iError == 1){
        MessageBox(NULL, (LPCTSTR)"Error at WSAStartup()", (LPCTSTR)"Client::Error", MB_OK|MB_ICONERROR);
        WSACleanup();
        return 0;
    }
    /* Correct version? */
    if(LOBYTE(t_wsa.wVersion) != 2 || HIBYTE(t_wsa.wVersion) != 2){
    MessageBox(NULL, (LPCTSTR)"Error at WSAStartup()", (LPCTSTR)"Client::Error", MB_OK|MB_ICONERROR);
        WSACleanup();
        return 0;
    }
    SOCKET sClient;
    sClient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); 
    if(sClient == INVALID_SOCKET || iError == 1){
        MessageBox(NULL, (LPCTSTR)"Invalid Socket!", (LPCTSTR)"Client::Error", MB_OK|MB_ICONERROR);
        WSACleanup();
        return 0;
    }
    SOCKADDR_IN sinClient;
    memset(&sinClient, 0, sizeof(sinClient));

 char cIP[50];

    sinClient.sin_family = AF_INET;
    sinClient.sin_addr.s_addr = inet_addr(IP); // Where to start server?
    sinClient.sin_port = htons(1003); // Port

    if(connect(sClient, (LPSOCKADDR)&sinClient, sizeof(sinClient)) == SOCKET_ERROR){
        /* failed at starting server */
        MessageBox(NULL, (LPCTSTR)"Could not connect to the server!", (LPCTSTR)"Client::Error", MB_OK|MB_ICONERROR);
        WSACleanup();
        return 0;
    }

    while(1){            
cout<<"Message: \n";
cin.getline(message,255);
string input2 = message;  

    // Now we can send/recv data!
    int iRet;
    char cBuffer[600];
    char buffer2[260];


//  MessageBox(NULL, (LPCTSTR)"Connected!", (LPCTSTR)"Client::Server", MB_OK|MB_ICONEXCLAMATION);

    strcpy(buffer, message );



iRet = send(sClient, buffer, strlen(buffer), 0); //send data 




    if(iRet == SOCKET_ERROR){
        MessageBox(NULL, (LPCTSTR)"Could not send data!", (LPCTSTR)"Client::Error", MB_OK|MB_ICONERROR);
        WSACleanup();
        return 0;
    }
}

    int bytes;
    bytes = SOCKET_ERROR;
    char *cServerMessage;
    cServerMessage = new char[600];
  while(bytes = recv(sClient, cServerMessage, 599, 0)){
    if(bytes == SOCKET_ERROR){
        char cError[500];
            sprintf(cError, "Connection failed, WINSOCK error code: %d", WSAGetLastError());
            MessageBox(NULL, (LPCTSTR)cError, (LPCTSTR)"Client::Error", MB_OK|MB_ICONERROR);
            closesocket(sClient);
        // Shutdown Winsock
        WSACleanup();
      return 0;
    }
    if (bytes == 0 || bytes == WSAECONNRESET) {
      MessageBox(NULL, (LPCTSTR)"Connection Disconnected!", (LPCTSTR)"Client::Error", MB_OK|MB_ICONERROR);
      closesocket(sClient);
      // Shutdown Winsock
      WSACleanup();
      return 0;
    }
    if(bytes < 1){
      Sleep(300);
      continue;
    }   
    delete [] cServerMessage;
    // Cleanup
    closesocket(sClient);
    // Shutdown Winsock
    WSACleanup();
    return 0;


}
Sleep(10);
// This is how to terminate a thread // TerminateThread(Thread_Handle,0);
}

    return 0;
}

Answer 1

recv()不会在写入的字节末尾追加'\0'。您需要使用recv()的返回值并自行添加'\0'。

Answer 2

如果您不关心带宽的额外字节，最快的修复可能只是在调用send（）时发送strlen（缓冲区）+1字节的strlen（缓冲区）字节。

Answer 3

为什么不将前4个字节放在消息的长度上？

Answer 4

为了保持简单（我不认为这里有性能或风格），你应该在函数Thread中设置整个cClientMessage（例如memset（cClientMessage，0,600））。然后也从发件人那里用主要的消息做同样的事。

由于接收器未传输或设置\ 0，因此您从上一条消息中获取过时的字符。

如何删除聊天的额外字符？ C ++

但它似乎无法正常工作

4 个答案: