How to confirm there're holes in a file on windows?

This is a discussion on How to confirm there're holes in a file on windows? within the Windows Programming forums, part of the Platform Specific Boards category; I used the C standard I/O `fseek' to create a file which had 50% holes in it. BUT I don't ...

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    How to confirm there're holes in a file on windows?

    I used the C standard I/O `fseek' to create a file which had 50% holes in it. BUT I don't know how to confirm this on Windows. With the same source code compiled on Linux, and then to use `du' and `ls -l' commands I can tell there are holes in the created file (`du' shows almost half size of `ls -l'). On windows, Unfortunately, right click the file, select properties, "size" and "size on disk" are nearly same. So I'm not sure about the holes really exist. Anyone can help? How to check?
    Thanks.

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    and the hat of wrongness Salem's Avatar
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    Quote Originally Posted by Salem View Post
    Hi Salem, Thank you very much!! Finally I created a sparse file.
    By the way, if anyone interested in this find `DeviceIoControl' returns 0, try `0x000900C4' instead of `FSCTL_SET_SPARSE'.

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