c# - DeviceIoControl returning false -

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in c# code,deviceiocontrol returning false,the handle correct

deviceiocontrol(devicehandle,   ioctl_storage_get_device_number,   intptr.zero,   0,   outbuffptr,//&psdn,   outbuffsize,   ref dwbytesreturned,    intptr.zero);

there not lot of data here go on, marshal.getlastwin32error() should give more specific error information.


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