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checking for existing strings in a textfile in vb2005

Posted on 2008-10-05
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Last Modified: 2010-04-23
Hi Experts

I have a textfile with the format :
PlayerName1,PlayerName2,GameType,
On my form I have 3 textboxs: PlayerName1 and PlayerName2 and GameType
I want to add the contents of the textboxs to the textfile but not if:
(A)PlayerName1 and PlayerName2 are already in the textfile(on the same row).
(B)PlayerName1 and GameType are already in the textfile(on the same row).
(C)PlayerName2 and GameType are already in the textfile(on the same row).

I know this is difficult but hope somebody can help.


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Question by:dizzycat
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6 Comments
 
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Expert Comment

by:elimesika
ID: 22645983
HI

Before getting to the point, did you consider using a database table instead of your text file?
It just the sort of problems that database is the natural tool to use with....
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Author Comment

by:dizzycat
ID: 22645998
I think next time I will as i find using textfiles difficult.
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Accepted Solution

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elimesika earned 500 total points
ID: 22646082
OK

Assuming you are familiar with VB coding, what you have to do is

1) define a structure as your file row (PlayerName1,PlayerName2,GameType)
2) Define a List of structures of the type defined in 1
3) In the Form_Load Read the file line by line, parse using the string.split on the comma separator and fill the List you have created in 2)
4) when the user enters new text and press the form button , loop the list and check all needed checking (that is easy to do in memory)
5) If check is passed , append the row to the file and add the corresponding entry to your List
6) Do not forget to close the file handle when you close the form.

Good Luck
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Author Comment

by:dizzycat
ID: 22704818
The above sounds good but I at least need some code to get me started, then maybe I can build from there.
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