i used create_async, but ui still get blocked

Question

hi all,

some code:

task<String^> InternalProcess(IStorageFile^ input)
{
StorageFolder^ localFolder =  ApplicationData::Current->LocalFolder;
task<StorageFile^>(input->CopyAsync(localFolder, "tmpfile", NameCollisionOption::ReplaceExisting));
auto op = input->CopyAsync(localFolder, "tmpfile", NameCollisionOption::ReplaceExisting);
task<StorageFile^> copyTask(op);
return copyTask.then([](StorageFile^ file){
                   //process image
                   String^ result;
                   return result;
          });
}

IAsyncOperation<String^>^ winrt::ProcessImage(IStorageFile^ input)
{
m_inputFile = input;
return create_async([this]() -> task<String^>{
return InternalProcess(m_inputFile);
});
}

why does the ui still get blocked when calling this ProcessImage method from Javascript?

Answer 1

it turns out that i have to use another create_async to wrap the process of image...

Answer 2

Thanks for sharing the solution.

Best regards,

Jesse

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Jesse Jiang [MSFT]
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