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MS Visual Basic  | Read first character in a text file

Posted on 2009-05-04
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Last Modified: 2013-11-26
I have an install program that needs to perform a version comparison. The installed program has a C:\MyDirectory\readme.txt file with only the version number in it: 8.0.2.1

How can I read the first character and if the value is LESS THAN 9, do X.

Thanks!
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Question by:blannan
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3 Comments
 
LVL 6

Accepted Solution

by:
DanielWillmott earned 2000 total points
ID: 24295728

	Dim objStreamReader as StreamReader   
	Dim line as String
	Dim version as Integer
 
	Try
		objStreamReader = File.OpenText("C:\MyDirectory\readme.txt")   
		line=sr.ReadLine()
		If Not (line Is Nothing)
			if line.Contains(".") then
				version=Integer.Parse(line.SubString(0,line.IndexOf(".")))
			else
				version=Integer.Parse(line)
			end if
		End If
		objStreamReader.Close()
		
		if version<9 then
			' do your thing here...
		end if
	Catch ex As Exception
		' exception processing here  	
	End Try

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LVL 6

Expert Comment

by:DanielWillmott
ID: 24295760
Ack..I think this will be better...
	Dim objStreamReader as StreamReader   
	Dim line as String
	Dim version as Integer
 
	Try
		objStreamReader = File.OpenText("C:\MyDirectory\readme.txt")   
		line=sr.ReadLine()
		If Not (line Is Nothing)
			if line.Contains(".") then
				version=Integer.Parse(line.SubString(0,line.IndexOf(".")-1))
			else
				version=Integer.Parse(line)
			end if
		End If
		objStreamReader.Close()
		
		if version<9 then
			' do your thing here...
		end if
	Catch ex As Exception
		' exception processing here  	
	End Try

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0
 

Author Comment

by:blannan
ID: 24296031
Accepted the wrong solution ... Your second one was the winner. Thanks again!
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