Finding length of data block in sparse file

StackOverflow https://stackoverflow.com/questions/13449171

Question

How can I find length of non-zero data block in sparse file starting from some offset? Do I have to make some file read or OS can read that information from some metadata which can be cached? I'm using Windows OS and Visual Studio C++.

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Solution

You can use DeviceIoControl with FSCTL_QUERY_ALLOCATED_RANGES command.

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