How to create a sparse file on NTFS?

Question

I\'m testing a sparse file. But my test code doesn\'t work well.

HANDLE h = CreateFileW(L\"D:\\\\sparse.test\",
        GENERIC_READ|GENERIC_WRITE,
        F         


        

Answer 1

You have to create a normal file, then use DeviceIoControl with FSCTL_SET_SPARSE to make it a sparse file.