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Tip of the Day
Language: Visual Basic
Expertise: Intermediate
Apr 30, 1999

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Fast String Array Load and Save

VB6 offers a couple new string functions that work with string arrays. One of these new string functions, Join, concatenates all the items of an array into an individual string using the delimiter string of choice. This builds a routine that quickly saves the contents of a string array to disk without iterating on individual array items:
 
Sub StringArraySave(Filename As String, Text() As String)
	Dim f As Integer
	f = FreeFile
	Open Filename For Output As #f
	Print #f, Join(Text, vbCrLf);
	Close #f
End Sub
The Split function does the opposite, first splitting a longer string into individual components delimited by the selected separator, then loading the components into a string array. If you couple this feature with a VB6 function to return an array, you can easily build a routine that loads a text file into a string array:
 
Function StringArrayLoad(Filename As String) As String()
	Dim f As Integer
	f = FreeFile
	Open Filename For Input As #f
	StringArrayLoad = Split(Input$(LOF(f), f), vbCrLf)
	Close #f
End Function
Use this function like this:
 
Dim Text() As String
Text = StringArrayLoad("c:\autoexec.bat")
Francesco Balena
 
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