That gets us to a good start but we also have to handle the fact that there may be more than one file open, and nobody likes being alerted by multiple dialogs. MsgBox "Error " & Err.Number & " (" & Err.Description & ")" Open PathName For Random Access Read Write Lock Read Write As #iĬase 70 'Unable to acquire exclusive lock
Public Function IsFileLocked(PathName As String) As Boolean For purposes of checking whether users has a file open, this should be sufficient. The locks can be acquired and released in milliseconds so calling the function is inherently racy. The only significant caveat is that this procedure is not appropriate for checking whether a file is locked by other processes such as running background tasks. In this situation, our attempt to acquire an exclusive lock will fail, allowing us to alert the user to close the file themselves before proceeding further or cancel out. Therefore trying to copy or read the file may be undesirable and threat it’s integrity. On the other hand, Word and Excel will place locks on their documents. Of course, one shouldn’t try to write to the said file but that’s not what we are doing here. txt files opened by Notepad and in this situation, it’s generally OK. Thus IsFileLocked() will return true for any. In this situation, it does no harm to copy or read the file while it’s open by Notepad. When we open a text file with Notepad, Notepad does not place any locks on the file even when we dirty the file.
#Vb6 open any file code#
However, we can at least approximate this functionality by attempting to open the file exclusively in our code and if we succeed, be reasonably sure that we are good to proceed onwards. So we needed a way to check whether files may be already open, alert the user to close the file, verify it’s closed then send the emails.ĭue to multitasking nature of Windows, there is no simple universal function to ask if a file, whatever type of file it may be, is open or not. This created a dilemma – if they can preview and potentially edit the files, we certainly don’t want to continue and try to attach open files to an email, therefore creating a problem. Our client wanted a way to preview the attachment before they actually send the email. In one of our client’s applications, we built an email template that sometimes may attach files to be sent out.
#Vb6 open any file software#
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