dcsimg
Login | Register   
LinkedIn
Google+
Twitter
RSS Feed
Download our iPhone app
TODAY'S HEADLINES  |   ARTICLE ARCHIVE  |   FORUMS  |   TIP BANK
Browse DevX
Sign up for e-mail newsletters from DevX

By submitting your information, you agree that devx.com may send you DevX offers via email, phone and text message, as well as email offers about other products and services that DevX believes may be of interest to you. DevX will process your information in accordance with the Quinstreet Privacy Policy.


Tip of the Day
Language: Visual Basic
Expertise: Beginner
Aug 6, 1997

WEBINAR:

On-Demand

Building the Right Environment to Support AI, Machine Learning and Deep Learning


Create Temporary Files

I'm developing a database program that deals with many auxiliary files at same time. Everyone coding database programs must create some temporary files to produce an output from SQL or a temporary database to manipulate those records efficiently. I decided to create a FileAux function that returns one temporary file name. If I need to create more than one file into the same process, I simply store those names into variables I dimensioned before:
 
Function FileAux(Ext As String) _
        As String
        Dim i As Long, X As String
        If InStr(Ext, ".") = 0 Then
                Ext = "." + Ext
        End If

        'Look for the previous files in the 
        'HardDisk
        i = 0
        Do 
                X = "Aux" + Format$(i, "0000") _
                        + Ext
                If FileExists(X) Then
                        i = i + 1
                Else
                        Exit Do
                End If
        Loop
        FileAux = X
End Function
This function uses the "FileExists" function:
 
Function FileExist(filename As String) _
        As Boolean
        FileExist = Dir$(filename) <> ""
End Function
Here's an example of its usage:
 
Sub Test()
        Dim File1 As String, File2 As _
                String, File3 As String
        Dim DB1 As database, DB2 As DataBase
        Dim FileNum As Integer
        File1 = FileAux("MDB")
        Set DB1 = CreateDataBase(File1)
        File2 = FileAux("MDB")
        Set DB2 = CreateDataBase(File2)
        File3 = FileAux("TXT")
        FileNum = FreeFile
        Open File3 For OutPut As FileNum
        'Your code
        ' ...
        Close FileNum
End Sub
File1, File2, and File3 should be "Aux0001.MDB," "Aux0002.MDB," and "Aux0001.TXT," respectively.
Luis Orlindo
 
Comment and Contribute

 

 

 

 

 


(Maximum characters: 1200). You have 1200 characters left.

 

 

Sitemap
Thanks for your registration, follow us on our social networks to keep up-to-date