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- The unlock operation was not performed
- Unlocking a file
- Position in the file
<DiskFile variable>.Unlock (Function) In french: <Variable FichierDisque>.Débloque Entirely or partially unlocks an external file. The file was locked by <DiskFile variable>.Lock. Caution: The unlock operation can be performed only if the section to unlock corresponds to the section locked.
MonFichierTxt is DiskFile
ResDébloque is boolean
IF MonFichierTxt.Ouvre("C:\MesRépertoires\Fichier.txt", foReadWrite) = True THEN
ResBloque = MonFichierTxt.Bloque()
...
ResDébloque = MonFichierTxt.Débloque()
END
Syntax
<Result> = <File used>.Unlock([<First byte to unlock> [, <Number of bytes to unlock>]])
<Result>: Boolean - True if the unlock operation was performed,
- False otherwise.
<File used>: DiskFile variable Name of the DiskFile variable initialized with .Open or Create. <First byte to unlock>: Optional integer Position of the first byte (character) to unlock (0 corresponds to the first byte of the file). <Number of bytes to unlock>: Optional integer Number of bytes (characters) to unlock. Remarks The unlock operation was not performed <DiskFile variable>.Unlock returns False if the unlock operation was not performed. The unlock operation can be performed if: - the external file is opened.
- the file identifier is valid.
- the file or the bytes to unlock are identical to the locked ones. For example, if only a file section was locked, this same section must be unlocked. If the file was entirely locked, you cannot unlock a section of the file.
- the file or the bytes to unlock have been locked by the same application and from the same computer.
Unlocking a file - The file is entirely unlocked if <First byte to unlock> and <Number of bytes to unlock> are not specified.
- The file is unlocked from the first specified byte (<First byte to unlock>) to the end of file if <Number of bytes to unlock> is not specified.
- A blocked (or partially blocked) file will be automatically unblocked when it is closed.
Position in the file When opening a file, the current position corresponds to: - the first file byte (by default),
- the last byte of the file if the file is opened in "addition" mode (foAdd constant).
The current position does not change when <DiskFile variable>.Unlock is executed. Business / UI classification: Business Logic
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