BRK2425-Effective-C++WinRT-for-UWP-and-Win32教学课件.pptxVIP

Effective C++/WinRT for UWP and Win32BRK2425Brent Rector Kenny KerrAgendaIntroductionHow can C++/WinRT help you?DemoEffective C++/WinRTQuestionsWhat is the Windows Runtime?What is C++/WinRT?An ISO standard C++17 language projection for the Windows RuntimeHeader-only library?C++ class wrappersfor WinRT APIsHow do you get it?Visual Studio 2017 15.7Select C++ workloadWhat you can do with C++/WinRTUse any Windows Runtime class via standard C++Coding productivity – What you want to write… Uri uri(Lhttp://aka.ms/cppwinrt);// URI to fetch? HttpClient client;// Class that does the fetching auto page = client.GetStringAsync(uri).get(); // Make async call wait? // Display the pageRuntime performance – Writing to the bare metal// Uri uri(Lhttp://aka.ms/cppwinrt);ComPtrIUriRuntimeClassFactory uriFactory;THROW_IF_FAILED( GetActivationFactory( HStringReference( RuntimeClass_Windows_Foundation_Uri).Get(), uriFactory));ComPtrIUriRuntimeClass uri;THROW_IF_FAILED( uriFactory-CreateUri( HStringReference(Lhttp://aka.ms/cppwinrt), uri));For this statementYou must write this codeProductivity previously – What you wrote#include ppltasks.h#include stdio.husing namespace Windows::Foundation;using namespace Windows::Web::Http;int main(Platform::ArrayPlatform::String^^ args) { Uri^ uri = ref new Uri(http://aka.ms/cppwinrt); HttpClient^ client = ref new HttpClient(); auto page = concurrency::create_task([] { return client-GetStringAsync(uri); }).get(); printf(%ls\n, Data());}79,360 bytes (x86 release)Productivity today using C++/WinRT#include winrt/Windows.Foundation.h#include winrt/Windows.Web.Http.h#include stdio.husing namespace winrt::Windows::Foundation;using namespace winrt::Windows::Web::Http;int main(int argc, char* argv) { winrt::init_apartment(); Uri uri(Lhttp://aka.ms/cppwinrt); HttpClient client; auto page = client.GetStringAsync(uri).get(); printf(%ls\n, page.c_str());}23,522 bytes (x86 release) 70% smaller than CXC++/WinRT Visual Studio ExtensionC++/WinRT Visual Studio Extens