C语言实现获取网络时间（c语言实现获取网络时间的代码）
自己写的代码，C语言实现获取网络时间，代码如下：
#include <windows.h>
#include <winhttp.h>
#include <stdio.h>
#include <string.h>
#pragma comment(lib, "winhttp.lib")
void removeQuotes(const char* source, char* destination) {
if (source == NULL || destination == NULL) {
printf("Invalid input parameters.\n");
return;
}
int i = 0, j = 0;
while (source[i] != '\0') {
if (source[i] != '"') {
destination[j++] = source[i];
}
i++;
}
destination[j] = '\0'; // 确保目标字符串以空字符结尾
}
void PrintDate(const char* content) {
const char* dateStr = strstr(content, "var today = \"");
if (dateStr) {
dateStr += 12; // 跳过 "var today = \""
const char* endStr = strstr(dateStr, "\";"); // 查找结尾的双引号和分号
if (endStr) {
char date[100];
int length = endStr - dateStr;
if (length >= sizeof(date)) {
length = sizeof(date) - 1; // 防止溢出
}
strncpy_s(date, sizeof(date), dateStr, length);
date[length] = '\0';
char destination[100]; // 确保目标字符串有足够的空间
removeQuotes(date, destination);
printf("%s\n", destination);
}
}
else {
printf("Date not found.\n");
}
}
int main() {
HINTERNET hSession = WinHttpOpen(L"WinHTTP Example Program", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);
if (!hSession) {
printf("WinHttpOpen failed (%d)\n", GetLastError());
return 1;
}
HINTERNET hConnect = WinHttpConnect(hSession, L"www.gcti.edu.cn", INTERNET_DEFAULT_HTTPS_PORT, 0);
if (!hConnect) {
printf("WinHttpConnect failed (%d)\n", GetLastError());
WinHttpCloseHandle(hSession);
return 1;
}
HINTERNET hRequest = WinHttpOpenRequest(hConnect, L"GET", L"/time/time.asp", NULL, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, WINHTTP_FLAG_SECURE);
if (!hRequest) {
printf("WinHttpOpenRequest failed (%d)\n", GetLastError());
WinHttpCloseHandle(hConnect);
WinHttpCloseHandle(hSession);
return 1;
}
if (!WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0)) {
printf("WinHttpSendRequest failed (%d)\n", GetLastError());
WinHttpCloseHandle(hRequest);
WinHttpCloseHandle(hConnect);
WinHttpCloseHandle(hSession);
return 1;
}
if (!WinHttpReceiveResponse(hRequest, NULL)) {
printf("WinHttpReceiveResponse failed (%d)\n", GetLastError());
WinHttpCloseHandle(hRequest);
WinHttpCloseHandle(hConnect);
WinHttpCloseHandle(hSession);
return 1;
}
DWORD dwSize = 0;
WinHttpQueryDataAvailable(hRequest, &dwSize);
if (dwSize == 0) {
printf("No data available.\n");
WinHttpCloseHandle(hRequest);
WinHttpCloseHandle(hConnect);
WinHttpCloseHandle(hSession);
return 1;
}
char* buffer = (char*)malloc(dwSize + 1);
if (!buffer) {
printf("Memory allocation failed.\n");
WinHttpCloseHandle(hRequest);
WinHttpCloseHandle(hConnect);
WinHttpCloseHandle(hSession);
return 1;
}
DWORD dwDownloaded = 0;
if (!WinHttpReadData(hRequest, (LPVOID)buffer, dwSize, &dwDownloaded)) {
printf("WinHttpReadData failed (%d)\n", GetLastError());
free(buffer);
WinHttpCloseHandle(hRequest);
WinHttpCloseHandle(hConnect);
WinHttpCloseHandle(hSession);
return 1;
}
buffer[dwSize] = '\0'; // Null-terminate the buffer
PrintDate(buffer);
free(buffer);
WinHttpCloseHandle(hRequest);
WinHttpCloseHandle(hConnect);
WinHttpCloseHandle(hSession);
return 0;
}
