如何使用URLDownloadToFile下载文件？

#include <urlmon.h>
#pragma comment(lib, "urlmon.lib")

HRESULT URLDownloadToFile(
  LPUNKNOWN            pCaller,
  LPCWSTR              szURL,
  LPCWSTR              szFileName,
  DWORD                dwReserved,
  LPBINDSTATUSCALLBACK lpfnCB
);

#include <iostream>
#include <urlmon.h>
#pragma comment(lib, "urlmon.lib")

int main() {
    LPCWSTR url = L"http://example.com/file.txt";
    LPCWSTR fileName = L"C:\\path\\to\\save\\file.txt";

    HRESULT hr = URLDownloadToFile(NULL, url, fileName, 0, NULL);
    if (hr == S_OK) {
        std::cout << "文件下载成功！" << std::endl;
    } else {
        std::cout << "文件下载失败，错误代码：" << hr << std::endl;
    }

    return 0;
}