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operation->GetResults() get null pointer!!

    Question

  • Hi all:

    I use WRL method for file access.

    However, now I usually OpenAsync() failed.

    Because [operation->GetResults(&PanoramaFile)] usually get null pointer. (Sometimes it's ok!)

    The code is as below.

    (The full code http://social.msdn.microsoft.com/Forums/en-US/winappswithnativecode/thread/f79d829f-8445-454a-b8d6-83cc3bc6b615

    ===========================================================================================

    HString hstrFileName;
     hstrFileName.Set(L"sample.txt");

     // Call CreteFileAsync
     __FIAsyncOperation_1_Windows__CStorage__CStorageFile_t * operation;

     hr = pStorageFolder->CreateFileAsync(hstrFileName.Get(),
      CreationCollisionOption::CreationCollisionOption_ReplaceExisting,
      &operation);
     if (FAILED(hr))
     {
          ::Microsoft::WRL::Details::RaiseException(hr);
     }


     operation->GetResults(&PanoramaFile);

     __RPC__deref_out_opt __FIAsyncOperation_1_Windows__CStorage__CStreams__CIRandomAccessStream *RandomStream;

     PanoramaFile->OpenAsync(FileAccessMode_ReadWrite, &RandomStream);

    ===========================================================================================

    Thursday, April 12, 2012 1:26 PM

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