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cvisual-studiowinapiwindows-runtime

Using WinRT from C?

Watching the //BUILD stuff, I saw that WinRT API's can be consumed by C code:

enter image description here

I am rather excited about a fresh C API available to Win32 developers.

Where can I find information on the C WinRT API? How is it better than the existing Win32 C API?

Solution

  • WinRT is fundamentally COM, so using WinRT components from C is like using COM components from C. Like before, you get .idl files for all WinRT components, and also .h files produced from those .idl files. The .h files include both C++ and C declarations (wrapped in #ifdef __cplusplus as needed). You can just #include them and start hacking away.

    It's not exactly neat, though, e.g. something like this C++/CX:

    Windows::UI::Xaml::Controls::TextBlock^ tb = ...;
tb->Text = "Foo";

    which is equivalent to this vanilla C++:

    Windows::UI::Xaml::Controls::ITextBlock* tb = ...;
HSTRING hs;
HRESULT hr = WindowsStringCreate(L"Foo", 3, &hs);
// check hr for errors
hr = tb->set_Text(hs);
// check hr for errors
tb->Release();

    would be written in C as:

    __x_Windows_CUI_CXaml_CControls_CITextBlock* tb = ...;
HRESULT hr;
HSTRING hs;
hr = WindowsCreateString(L"Foo", 3, &hs);
// check hr for errors
hr = __x_Windows_CUI_CXaml_CControls_CITextBlock_put_Text(tb, hs);
// check hr for errors
IUnknown_Release(tb);

    Look inside "C:\Program Files (x86)\Windows Kits\8.0\Include\winrt" in Developer Preview to see the .idl and .h files.