windows C++ 获取网络时间
时间: 2023-10-19 19:07:52 浏览: 217
可以使用 Winsock 库中的函数获取网络时间。下面是一个简单的例子:
```c++
#include <iostream>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
int main() {
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
std::cerr << "Failed to initialize Winsock\n";
return 1;
}
SOCKET sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock == INVALID_SOCKET) {
std::cerr << "Failed to create socket\n";
WSACleanup();
return 1;
}
struct hostent* host = gethostbyname("time.nist.gov");
if (host == NULL) {
std::cerr << "Failed to resolve server name\n";
closesocket(sock);
WSACleanup();
return 1;
}
struct sockaddr_in serverAddr;
memset(&serverAddr, 0, sizeof(serverAddr));
serverAddr.sin_family = AF_INET;
serverAddr.sin_addr.s_addr = *((unsigned long*)host->h_addr);
serverAddr.sin_port = htons(13);
if (connect(sock, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) == SOCKET_ERROR) {
std::cerr << "Failed to connect to server\n";
closesocket(sock);
WSACleanup();
return 1;
}
char buffer[1024];
int recvSize = recv(sock, buffer, sizeof(buffer), 0);
if (recvSize <= 0) {
std::cerr << "Failed to receive data from server\n";
closesocket(sock);
WSACleanup();
return 1;
}
buffer[recvSize] = '\0';
char* timeStr = strstr(buffer, "UTC");
if (timeStr == NULL) {
std::cerr << "Failed to parse time from server response\n";
closesocket(sock);
WSACleanup();
return 1;
}
timeStr += 4; // skip "UTC "
struct tm timeInfo;
memset(&timeInfo, 0, sizeof(timeInfo));
strptime(timeStr, "%b %d %H:%M:%S %Y", &timeInfo);
time_t timeValue = mktime(&timeInfo);
std::cout << "Network time: " << asctime(gmtime(&timeValue));
closesocket(sock);
WSACleanup();
return 0;
}
```
这个例子通过连接到 NIST 的时间服务器获取当前的网络时间,并将其输出到控制台。注意,这个例子需要链接 `ws2_32.lib` 库。