Win8 HTTP API 和 异步编程 API

---

Metro里推荐使用的API

• HTTP: IXMLHTTPRequest2
• XML: XmlDocument

Metro 异步编程

• 用于本地c++编程APIConcurrency::task

  // basic-task.cpp
  // compile with: /EHsc
  #include <ppltasks.h>
  #include <iostream>
  
  using namespace Concurrency;
  using namespace std;
  
  int wmain()
  {
  task<int> t([]() {
      return 42;
  });
  
  t.wait();
  wcout << t.get() << endl;
  }
  
  /* Output:
  42
  */
  

• 用于WinRT c++编程APIWindows::Foundation::IAsyncXXX

  Windows::Foundation::IAsyncAction
  Represents an asynchronous action.
  Windows::Foundation::IAsyncActionWithProgress<TProgress>
  Represents an asynchronous action that reports progress.
  Windows::Foundation::IAsyncOperation<TResult>
  Represents an asynchronous operation that returns a result.
  Windows::Foundation::IAsyncOperationWithProgress<TResult, TProgress>
  Represents an asynchronous operation that returns a result and reports progress.