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How to lock a volume of a drive



Title: How to lock a volume of a drive

Hi All
        I am new to MacOsx. I am writing a program which will detect the drive mounted on the MacOsx system through an USB device. I want to lock the volume of that drive. I use  FSSpec structure to be passed as a parameter in FSpSetFLock() to lock it .In order to form the FSSpec structure I use FSMakeFSSpec()  and passed "VolumeRefNo, ParID as fsRtParID  and the Filename as volumename and &FSSpec" Now when I run that program FSMakeFSSpec()   return error for following different situation.

ParID = 0, Filename =volumename the error is -37 i.e Bad pathname
PartID=fsRtParID  ,Filename =0  the error is -35 i.e drive donot exist.
PartID=fsRtParID  ,Filename =volumename  the error is -35 i.e drive donot exist.

So untill and unless I am able to form the FSSpec structure I am  not able to lock that volume. So please can any body suggest how to lock a volume of a drive. Or my approach is right or wrong. Please help.

thanks with regards,
Pranab Halder


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