I try to change the attribute of file in SD card but fail. Here is my code :

err = VFSFileOpen(volRefNum, kExpansionKeyPathFilename, vfsModeReadWrite,
&ref);
err = VFSFileGetAttributes(ref, &value);
value = value|vfsFileAttrHidden|vfsFileAttrSystem;
err = VFSFileSetAttributes(ref, value);
err = VFSFileClose(ref);

It fails on VFSFileSetAttributes with error 0x0502. Pleaes help.



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