Javascript code _ javascript skills used to determine whether a file is being used

This article mainly introduces the JS Code used to determine whether a file is being used. For more information, see The Code is as follows:

// Determine whether the file is in use

Function FileINUse (filename: String): boolean;
Var
Usein: file;
Begin
Result: = false;
Assignfile (usein, FileName );
Try
Reset (Usein );
Except
On E: EInOutError do
Begin
If e. ErrorCode = 32 then
Begin
Result: = true;
Exit;
End;
End;
End;
Closefile (usein );
End;

Procedure TForm1.Button1Click (Sender: TObject );
If OpenDialog1.Execute then
Begin
If fileInuse (OpenDialog1.filename) then
ShowMessage ('file in use ')
Else
ShowMessage ('unused ');
End;