Access Event

Fires when the OS needs to check file access permissions.

Syntax

type TAccessEvent = procedure (
  Sender: TObject;
  const Path: String;
  Mask: Integer;
  var Result: Integer
) of Object;

property OnAccess: TAccessEvent read FOnAccess write FOnAccess;

Remarks

Windows:

This event fires when the OS needs to know whether the file or directory specified in Path can be deleted. For this, the Mask parameter is set to 2 (W_OK).

The application must return 0 in the Result parameter to indicate that deletion is permitted, or an error code otherwise.

Linux:

This event fires when the OS needs to check access permissions of the file or directory specified in Path. Specifically, the event fires when a process uses the access() system call.

The application must return 0 in the Result parameter to indicate that access, requested by the Mask parameter is permitted, or -EACCES to indicate that access is denied.

If the event cannot be handled in a "successful" manner for some reason (e.g., a resource isn't available, security checks failed, etc.), set it to a negative error code value (e.g. -ENOENT to indicate that the file does not exist) to report an appropriate error. Please refer to the Error Reporting and Handling topic for more information.