#ifndef _CRT_SECURE_NO_WARNINGS #define _CRT_SECURE_NO_WARNINGS #endif #include <stdio.h> #include <string.h> #ifndef _CRT_SECURE_NO_WARNINGS #define _CRT_SECURE_NO_WARNINGS #endif int main(int argc, char* argv[]) { char inputBuffer[20]; if (argc != 2) { printf("Usage: %s <input>\n", argv[0]); return 1; } strncpy_s(inputBuffer, sizeof(inputBuffer), argv[1], _TRUNCATE); printf("Input: %s\n", inputBuffer); return 0; } 程序运行不了有错误，错误提示是_TRUNCATE’未声明(在此函数内第一次使用) strncpy_s(inputBuffer, sizeof(inputBuffer), argv[1], _TRUNCATE);该怎么修改

可以加上头文件 `#include <stdlib.h>`，因为 `_TRUNCATE` 是在 `stdlib.h` 头文件中定义的。修改后的代码如下：

#ifndef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#ifndef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#endif

int main(int argc, char* argv[]) {
    char inputBuffer[20];
    if (argc != 2) {
        printf("Usage: %s <input>\n", argv[0]);
        return 1;
    }
    strncpy_s(inputBuffer, sizeof(inputBuffer), argv[1], _TRUNCATE);
    printf("Input: %s\n", inputBuffer);
    return 0;
}

相关问题

客户端代码#define _WINSOCK_DEPRECATED_NO_WARNINGS #define _CRT_SECURE_NO_WARNINGS #include <stdio.h> #include <stdlib.h> #include <string.h> #include <WinSock2.h> #ifndef MSG_NOSIGNAL #define MSG_NOSIGNAL 0 #endif #pragma comment(lib,"ws2_32.lib") DWORD WINAPI ReceiveThread(LPVOID lpParam) { SOCKET sockClient = (SOCKET)lpParam; char recvBuf[50]; while (1) { // 接收服务器的消息并打印出来 int ret = recv(sockClient, recvBuf, 50, 0); if (ret <= 0) { break; } printf("Received from server: %s\n", recvBuf); } return 0; } int main() { WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD(1, 1); err = WSAStartup(wVersionRequested, &wsaData); if (err != 0) { return -1; } if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1) { WSACleanup(); return -1; } // 创建套接字并连接到服务器 SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0); SOCKADDR_IN addrSrv; addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); addrSrv.sin_family = AF_INET; addrSrv.sin_port = htons(6000); connect(sockClient, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR)); // 创建新线程来接收服务器的消息 HANDLE hThread = CreateThread(NULL, 0, ReceiveThread, &sockClient, 0, NULL); char sendBuf[50]; while (1) { // 读取用户输入的消息并发送给服务器 printf("Input message to send: "); fgets(sendBuf, 50, stdin); send(sockClient, sendBuf, strlen(sendBuf) + 1, 0); } // 关闭线程句柄 CloseHandle(hThread); closesocket(sockClient); WSACleanup(); return 0; }

这段代码是一个简单的客户端代码，主要功能是连接服务器，并发送和接收消息。它也使用了 WinSock2 库来进行网络编程。在主函数中，首先调用了 WSACleanup() 函数来释放 WinSock2 库占用的资源。然后创建了一个套接字，并将其连接到服务器。接着创建一个新线程来接收服务器的消息，使用 fgets() 函数读取用户输入的消息，并将其发送给服务器。在 ReceiveThread 函数中，不断接收服务器发送的消息，并打印出来。当服务器断开连接时，该线程退出。在主函数中，当用户输入 exit 命令时，关闭线程句柄，释放套接字并释放 WinSock2 库占用的资源。

客户端代码 #define _WINSOCK_DEPRECATED_NO_WARNINGS #include <stdio.h> #include <Winsock2.h> #ifndef MSG_NOSIGNAL #define MSG_NOSIGNAL 0 #endif #pragma comment(lib,"ws2_32.lib") int main() { WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD(1, 1); err = WSAStartup(wVersionRequested, &wsaData); if (err != 0) { return -1; } if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1) { WSACleanup(); return -1; } SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0); SOCKADDR_IN addrSrv; addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); addrSrv.sin_family = AF_INET; addrSrv.sin_port = htons(6000); connect(sockClient, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR)); send(sockClient, "hello\0", strlen("hello") + 1, 0); char recvBuf[50]; recv(sockClient, recvBuf, 50, 0); printf("%s\n", recvBuf); closesocket(sockClient); WSACleanup(); return 0;} 服务器端：#define _WINSOCK_DEPRECATED_NO_WARNINGS #include <stdio.h> #include <Winsock2.h> #ifndef MSG_NOSIGNAL #define MSG_NOSIGNAL 0 #endif #pragma comment(lib,"ws2_32.lib") int main() { WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD(2, 2); err = WSAStartup(wVersionRequested, &wsaData); if (err != 0) { return 1; } if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) { WSACleanup(); return 1; } SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0); int optval = 1; setsockopt(sockSrv, SOL_SOCKET, SO_REUSEADDR, (const char*)&optval, sizeof(optval)); SOCKADDR_IN addrSrv; addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY); addrSrv.sin_family = AF_INET; addrSrv.sin_port = htons(6000); bind(sockSrv, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR)); listen(sockSrv, 5); SOCKADDR_IN addrClient; int len = sizeof(SOCKADDR); while (1) { SOCKET sockConn = accept(sockSrv, (SOCKADDR*)&addrClient, &len); char sendBuf[50]; printf(sendBuf, "Welcome %s to here!", inet_ntoa(addrClient.sin_addr)); send(sockConn, sendBuf, strlen(sendBuf) + 1, MSG_NOSIGNAL); char recvBuf[50]; recv(sockConn, recvBuf, 50, 0); printf("%s\n", recvBuf); closesocket(sockConn); } WSACleanup(); return 0;} 如何修改代码改成可以一直聊天的 不要预输入进去的 要我自己在客户端进行打字操作

要实现客户端和服务器之间的实时聊天，需要在客户端代码中添加一个循环来不断读取用户输入的消息，并将其发送给服务器。同时，在服务器端代码中也需要添加一个循环来不断接收客户端发送的消息，并将其广播给所有连接的客户端。

下面是修改后的客户端代码：

#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include <stdio.h>
#include <Winsock2.h>

#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif

#pragma comment(lib,"ws2_32.lib")
int main() {
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;
    wVersionRequested = MAKEWORD(1, 1);
    err = WSAStartup(wVersionRequested, &wsaData);
    if (err != 0) {
        return -1;
    }
    if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1) {
        WSACleanup();
        return -1;
    }

    // 创建套接字并连接到服务器
    SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0);
    SOCKADDR_IN addrSrv;
    addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    addrSrv.sin_family = AF_INET;
    addrSrv.sin_port = htons(6000);
    connect(sockClient, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));

    char sendBuf[50], recvBuf[50];
    while (1) {
        // 读取用户输入的消息并发送给服务器
        printf("Input message to send: ");
        fgets(sendBuf, 50, stdin);
        send(sockClient, sendBuf, strlen(sendBuf) + 1, 0);

        // 接收服务器的响应并打印出来
        recv(sockClient, recvBuf, 50, 0);
        printf("Received from server: %s\n", recvBuf);
    }

    closesocket(sockClient);
    WSACleanup();
    return 0;
}

下面是修改后的服务器端代码：

#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include <stdio.h>
#include <Winsock2.h>

#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif

#pragma comment(lib,"ws2_32.lib")
int main() {
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;
    wVersionRequested = MAKEWORD(2, 2);
    err = WSAStartup(wVersionRequested, &wsaData);
    if (err != 0) {
        return 1;
    }
    if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
        WSACleanup();
        return 1;
    }

    // 创建套接字并绑定到本地地址和端口
    SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);
    int optval = 1;
    setsockopt(sockSrv, SOL_SOCKET, SO_REUSEADDR, (const char*)&optval, sizeof(optval));
    SOCKADDR_IN addrSrv;
    addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
    addrSrv.sin_family = AF_INET;
    addrSrv.sin_port = htons(6000);
    bind(sockSrv, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));

    // 监听连接请求并接受客户端连接
    listen(sockSrv, 5);
    SOCKADDR_IN addrClient;
    int len = sizeof(SOCKADDR);
    SOCKET sockConn;
    fd_set fdReads;

    while (1) {
        // 使用 select() 函数实现非阻塞接收客户端连接
        FD_ZERO(&fdReads);
        FD_SET(sockSrv, &fdReads);
        int ret = select(sockSrv + 1, &fdReads, NULL, NULL, NULL);
        if (ret < 0) {
            break;
        }
        if (FD_ISSET(sockSrv, &fdReads)) {
            sockConn = accept(sockSrv, (SOCKADDR*)&addrClient, &len);
            char sendBuf[50];
            printf(sendBuf, "Welcome %s to here!\n", inet_ntoa(addrClient.sin_addr));
            send(sockConn, sendBuf, strlen(sendBuf) + 1, MSG_NOSIGNAL);
        }

        // 使用 select() 函数实现非阻塞接收客户端消息
        FD_ZERO(&fdReads);
        FD_SET(sockConn, &fdReads);
        ret = select(sockConn + 1, &fdReads, NULL, NULL, NULL);
        if (ret < 0) {
            break;
        }
        if (FD_ISSET(sockConn, &fdReads)) {
            char recvBuf[50];
            recv(sockConn, recvBuf, 50, 0);
            printf("Received from client: %s\n", recvBuf);

            // 将客户端发送的消息广播给所有连接的客户端
            for (SOCKET i = 0; i < FD_SETSIZE; i++) {
                if (FD_ISSET(i, &fdReads)) {
                    send(i, recvBuf, strlen(recvBuf) + 1, MSG_NOSIGNAL);
                }
            }
        }
    }

    closesocket(sockSrv);
    WSACleanup();
    return 0;
}