跨设备同步Desktop App Converter应用设置及相关API技术问询

Great question—let’s break this down clearly for your C++ Win32 app wrapped with Desktop Bridge:

1. Should you use the Windows.Storage.ApplicationData.Current.RoamingSettings API? #

Absolutely. This is the official, recommended way to leverage Azure AD-backed roaming settings for your Desktop Bridge-packaged app. The Desktop Bridge provides the required app identity that the UWP roaming API needs, so once your Win32 app is packaged, this API will work as intended. This aligns with the "minimal code changes" mentioned in the documentation—you don’t need to rewrite your entire app, just integrate this API where you handle settings.

2. Does using this API require loading the .NET Framework? #

Nope, not at all. You can call UWP WinRT APIs directly from native C++ using either:

• C++/WinRT: A modern, idiomatic C++ projection for WinRT APIs (cleaner syntax, easier to use).
• WRL (Windows Runtime C++ Template Library): A lower-level COM-style approach for WinRT access.

Both are native C++ solutions—no .NET dependency required. You’ll just need to set up your project to reference the necessary WinRT headers and libraries (most modern Visual Studio templates handle this automatically when targeting Desktop Bridge).

3. Are there Win32 alternatives? #

There’s no direct Win32 API equivalent for UWP’s roaming settings, since roaming is a UWP platform feature. You could build a custom cloud sync solution using Azure AD authentication and your own backend, but that would require writing far more code than just using the existing RoamingSettings API.

The "minimal code changes" the documentation refers to is exactly this: swapping out your existing local settings code with calls to the UWP RoamingSettings API, rather than building a custom solution.

Quick C++/WinRT Example #

Here’s a simple snippet to show how you’d read/write roaming settings in your Win32 app:

#include <winrt/Windows.Storage.h>
#include <winrt/base.h>

using namespace winrt;
using namespace Windows::Storage;

int main()
{
    // Initialize the WinRT apartment (required once per thread)
    init_apartment();

    // Write a roaming setting
    ApplicationData::Current().RoamingSettings().Values().Insert(L"UserPreference", box_value(L"DarkMode"));

    // Read a roaming setting
    auto settingValue = ApplicationData::Current().RoamingSettings().Values().TryLookup(L"UserPreference");
    if (settingValue)
    {
        hstring preference = unbox_value<hstring>(settingValue);
        // Use the preference value here
    }

    return 0;
}

内容的提问来源于stack exchange，提问作者Martin Prikryl