hFile (HFILE) - input

The handle returned by a previous DosOpen function.

ib (LONG) - input

The signed distance (offset) to move, in bytes.

method (ULONG) - input

The method of moving.

This field specifies the location in the file at which the read/write pointer starts before adding the ib offset. The values and their meanings are as shown in the following list:

• FILE_BEGIN Move the pointer from the beginning of the file.

• FILE_CURRENT
  Move the pointer from the current location of the read/write pointer.

• FILE_END
  Move the pointer from the end of the file. Use this method to determine a file's size.

ibActual (PULONG) - output

Address of the new pointer location.

fhFileHandleLockID (FHLOCK) - input

The filehandle lockid returned by a previous DosProtectOpen.

ulrc (APIRET) - returns

Return Code.

DosProtectSetFilePtr returns one of the following values:

• NO_ERROR 1
  ERROR_INVALID_FUNCTION
  6
  ERROR_INVALID_HANDLE
  132
  ERROR_SEEK_ON_DEVICE
  131
  ERROR_NEGATIVE_SEEK
  130
  ERROR_DIRECT_ACCESS_HANDLE
  For a full list of error codes, see Errors.