c++ - 发送和接收 C++

Question

我正在尝试在我的程序中使用发送和接收命令，这是一个客户端服务器消息传递软件。

然而，当代码运行时，我似乎无法传递消息，因为 send cmd 没有传递数据。命令执行后，我尝试传递的数据(缓冲区)为空，我通过打印(缓冲区)进行了检查。为什么会这样……如果有人能帮助我，我将不胜感激。

服务器端代码:

#include<iostream>
#include<string.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<stdlib.h>
#include<unistd.h>
#include<netinet/ip.h>
using namespace std;

int main()
{
    int client, server, i;
    int portNum = 1500;
    bool isExit = false;
    int bufsize = 1024;
    char buffer[bufsize];

struct sockaddr_in server_addr;
    socklen_t size;

// init socket

    client = socket(AF_INET, SOCK_STREAM, 0);

    if (client < 0)
    {
    cout << "Error establishing connection" << endl;
    exit(1);
    }

    cout << "Server Socket connection created..." << endl;

    server_addr.sin_family = AF_INET;
  //  server_addr.sin_addr.s_addr = htons(INADDR_ANY);
    server_addr.sin_port = htons(portNum);
    server_addr.sin_addr.s_addr = inet_addr("192.168.0.5");
// Binding socket  

    if (bind(client, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0)
    {
    cout << "Error binding socket...." << endl; 
    exit(1);
    }

size = sizeof(server_addr);
cout << "Looking for clients..." << endl;

// Listening socket

    listen(client, 1);

// Accept client

    server = accept(client, (struct sockaddr*)&server_addr, &size);
if (server < 0)
{
cout << "Error on accepting.." << endl;
exit(1);
}
 cout << "Connected with client..." << endl;
cout << "Enter your message:\n" << endl;
    cin >> buffer;
    cout << buffer;
    send(server, buffer, bufsize, 0);
cout << "message sent...\n", buffer;
return 0;
}

客户端代码

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

using namespace std;

int main()
{

int client, server, i;
    int portNum = 1500;
    bool isExit = false;
    int bufsize = 1024;
    char buffer[bufsize];
    struct sockaddr_in server_addr;

// Init socket 


    client = socket(AF_INET, SOCK_STREAM, 0);

    if (client < 0)
    {
    cout << "Error creating socket" << endl;
    exit(1);
    }

cout << "Client socket created" << endl;

server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(portNum);
server_addr.sin_addr.s_addr = inet_addr("192.168.0.5");
// Connecting socket server

if (connect(client, (struct sockaddr*)&server_addr, sizeof(server_addr)) == 0)

{
     cout << "Connecting to server..." << endl;
     recv(client, buffer, bufsize, 0);

     buffer[bufsize] = '\0';

     cout << "client: received", buffer;

 close(client);
}
return 0;
}

Answer 1

你实际上并没有打印 buffer :

cout << "client: received", buffer;

应该是:

cout << "client: received " << buffer;

你可能还想要一个 endl :

cout << "client: received " << buffer << endl;