Debugging WP8 Native Code using a file - windows-phone-8

Question

I'm developing a WP8 app that has some native code (runtime component).
Inside the runtime component I need to check to content of a c style array.
Because this array is not small, I thought the best I could do is write the array in a file
using fopen/fwrite/fclose;
Checking the returned value from fopen and fwrite, I can see that it succeeded.
But I cannot find the file (using Windows Phone Power Tools).
So where has the file been written?
Is there another way to dump the content of the array to a file (on the computer) from visual studio ?

Answer 1

I'm unfamiliar with the fopen/fwrite/fclose APIs in WP8. Which probably means it's not a whitelisted API you can use to submit your app with. It's best if you just use "Windows::Storage::ApplicationData::Current->LocalFolder" when working with IsoStore in C++. See Win8 code sample # http://msdn.microsoft.com/en-us/library/windows/apps/xaml/hh700361.aspx?cs-save-lang=1&cs-lang=cpp#code-snippet-1

Answer 2

Thanks Justin,
here's how I ended up doing it:
auto folder = Windows::Storage::ApplicationData::Current->LocalFolder;
Concurrency::task<Windows::Storage::StorageFile^> createFileOp(
folder->CreateFileAsync(L"Data.bin", Windows::Storage::CreationCollisionOption::ReplaceExisting));
createFileOp.then(
[nData, pData](Windows::Storage::StorageFile^ file)
{
return file->OpenAsync(Windows::Storage::FileAccessMode::ReadWrite);
})
.then([nData, pData](Windows::Storage::Streams::IRandomAccessStream^ stream)
{
auto buffer = ref new Platform::Array<BYTE>(pData, nData);
auto outputStream = stream->GetOutputStreamAt(0);
auto dataWriter = ref new Windows::Storage::Streams::DataWriter(outputStream);
dataWriter->WriteBytes(buffer);
return dataWriter->StoreAsync();
})
.wait();
Now compare that to what I "meant" :
FILE *fp = fopen("Data.bin", "wb");
if (fp)
{
int ret = fwrite(pData, 1, nData, fp);
fclose(fp);
}