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delphidelphi-xe7

What is "I/O error 1785"?

I am getting "I/O error "1785" in my program in

Vcl.FileCtrl.TDirectoryListBox.SetDirectory -> Vcl.FileCtrl.ProcessPath

I cannot find a description in Delphi's Help for this.

Solution

  • From the help file:

    All errors other than I/O errors and fatal errors are reported with the error codes returned by the operating system.

    As all of the listed I/O errors are in the 100..106 range, and the fatal errors are all in 200..232, it stands to reason that this is an OS error, and SysErrorMessage(1785) would give you a description of the error:

    The disk media is not recognized. It may not be formatted.

    The actual error is ERROR_UNRECOGNIZED_MEDIA (thanks to @JoachimIsaksson for looking it up so I didn't have to do so).