2402C++,现代窗口接口

#include <string>
#include <iostream>
#include <winrt/Windows.Foundation.h>
#include <winrt/Windows.Foundation.Collections.h>
#include <winrt/Windows.Web.Http.h>
#include <winrt/Windows.Storage.h>
#include <winrt/Windows.Storage.Streams.h>

using namespace winrt;
using namespace Windows::Foundation;
using namespace Windows::Web::Http;
using namespace Windows::Storage;
using namespace Windows::Storage::Streams;

IAsyncAction DownloadToFile(std::wstring &url, std::wstring &dirPath) {
    HttpClient client;
    auto response = co_await client.GetAsync(Uri(url));
    response.EnsureSuccessStatusCode();
    auto buffer = co_await response.Content().ReadAsBufferAsync();
    auto localFolder = co_await StorageFolder::GetFolderFromPathAsync(dirPath);
    auto file = co_await localFolder.CreateFileAsync(L"downloaded.html", CreationCollisionOption::ReplaceExisting);
    co_await FileIO::WriteBufferAsync(file, buffer);
    co_return;
}

IAsyncOperation<int> Main() {
    std::wstring url = __argc > 1 ? __wargv[1] : L"https://aka.ms/cppwinrt";
    std::wstring dir_path = __argc > 2 ? __wargv[2] : L"C:\\Temp";
    try {
        co_await DownloadToFile(url, dir_path);
        std::wcout << "Done." << std::endl;
        co_return 0;
    } catch (hresult_error const &ex) {
        std::wcout << "Error: " << std::wstring_view(ex.message()) << std::endl;
        co_return 1;
    }
}

int main() {
    init_apartment();
    return Main().get();
}
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