dcsimg
Login | Register   
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: Intermediate
Feb 24, 2000

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Wrap I/O for Text Files

In a production application, every time you want to access a file for reading or writing, you must retrieve a free handle using the FreeFile() function to ensure you don't overwrite an existing handle. You also must remember to close the file after you finish with it. In some cases, you can avoid the trouble by encasing this functionality inside utility functions. For example, I wrote these two functions to go between strings and text files in my apps:
 
Public Function ReadFile(FileName As String) As String
	Dim hFile As Integer
	hFile = FreeFile
	On Error GoTo ErrorTrap
		Open FileName For Input As #hFile
		ReadFile = Input(LOF(hFile), hFile)
		Close # hFile
	Exit Function
ErrorTrap:
	ReadFile = ""
End Function
Public Sub WriteFile(FileName As String, Contents As 	_
	String)
	Dim hFile As Integer
	hFile = FreeFile
	On Error Resume Next
	Open FileName For Output As #hFile
	Print #hFile, Contents;
	Close #hFile
End Sub
Once you put these functions in your project, you can read and write text files quickly. For example, here's a way you might use these functions to copy text files:
 
Call WriteFile("c:\b.txt", ReadFile("c:\a.txt"))
Konstantin Komissarchik
 
Comment and Contribute

 

 

 

 

 


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

 

 

Sitemap
×
We have made updates to our Privacy Policy to reflect the implementation of the General Data Protection Regulation.
Thanks for your registration, follow us on our social networks to keep up-to-date