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file processing in visual basic

 
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file processing in visual basic, read from file
renoald
27 Jul, 2008 - 01:49 AM
Post #1

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i have problem with visual basic programing! i want read data from txt file and do the calculation!.
Below is my txt fle(in notepad):

#Cerapan Jarak
D 1-2 9999.030 0.038
D 2-3 9998.030 0.038
D 1-3 14142.110 0.094

#Cerapan sudut
A 1-2-3 44-59-19 2.4
A 2-3-1 90-01-22.1 2.4
A 3-1-2 44-59-18.1 2.4

#Cerapan Azithmuth
B 3-1 225-00-15 1
B 1-2 00-00-58 1

#Koordinat stesen
c 1 10000.0000 10000.0000 ! !
c 2 10002.7140 19998.0000
c 3 20000.7140 19999.2600

Problem:
when meet character "#", skip the line
-How to skip the line in VB?

Value n=8, where 3 char A ,2 char B and 3 char B
how to read from file and find how many character A,B and D?

how to get value 9999.030 and 0.038 from file?
9999.030 and 0.038 to become double that use in calculation!
any can idea to resolve this problem?
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no2pencil
RE: File Processing In Visual Basic
27 Jul, 2008 - 01:58 AM
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When you read in your string, test it with InStr, which will return the position in the string where the character is found. If it has a value other than zero, then don't keep it, or basically drop it. If it has a zero value, then # is not in the string, so process it.

vb

' String to search in.
Dim SearchString As String = ""

' Fill SearchString with the line from the file 
TestPos = InStr(1, SearchString, "#")
If TestPos > 0 Then
  ' Drop this string
End


I hope this helps, as I am very rusty with VB.
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adw888
RE: File Processing In Visual Basic
27 Jul, 2008 - 02:16 AM
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Looking at your file, the easiest way would probably be to use the "Line Input" command to read each line individually into a string: http://www.dreamincode.net/code/snippet318.htm
Then you would just check the first character to see if it was a "#" and skip processing the line if so. If it isn't a comment line, then you could use the "Split" command and break the string up according to where the spaces are. Once you've split up the string, the first substring will hold "A", "B", "c", or "D" while the third and fourth (for the "D" lines) will hold the values for your calculation. You should just be able to assign those values into Double variables, but I'm not 100% sure about that part.

Hope this helps. smile.gif

EDIT: I just quickly tried what I've written above and it all works. I would post the code here but as you haven't posted any code of your own that would be against the rules if I remember correctly.

This post has been edited by adw888: 27 Jul, 2008 - 02:32 AM
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