Using WinRT from C?

c visual-studio winapi windows-runtime
Andrew picture Andrew · Sep 15, 2011 · Viewed 12k times · Source

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

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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?

Answer

Pavel Minaev picture Pavel Minaev · Sep 15, 2011

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.

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