Read/write files in VB

My friend need to do a application that able to read from a file to get some parameters for the application to run. The application will then generate some data into another text file (storing informations). The application should have limitation of the numbers of line for the content of the text files that can stored. Lets say the application will only stored 500 line for each text file, if the content of the text file reach 500 lines, it should automatically open another text file to write the content. When the program read back from the text files, it should get all the text files' content.

Anyone have similar sampel program in VB? Thanks in advance.

It would help if you attached the source file or at least posted a sample of it.

The application haven't started yet. Thats why she need a sampel.

There are countless samples about reading/writing from/to files all over the forums... just search for read and write...

Code:

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The application should have limitation of the numbers of line for the content of the text files that can stored. Lets say the application will only stored 500 line for each text file, if the content of the text file reach 500 lines, it should automatically open another text file to write the content. When the program read back from the text files, it should get all the text files' content.

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How about this section?

You can write to a file with a Print statement and increase a counter for 1 each time. When the counter reaches 500, go to the next file. The same goes for reading if you're doing it with a Line Input statement.

Here are a couple of threads in our FAQ forum.

http://vbforums.com/showthread.php?t=342619
http://vbforums.com/showthread.php?t=405051

Gavio, the links you posted are searchid's which are temporary. I think they get deleted after a day or so.

Code:

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You can write to a file with a Print statement and increase a counter for 1 each time. When the counter reaches 500, go to the next file. The same goes for reading if you're doing it with a Line Input statement.

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If i already storing records in 4 files (4 x 500 = 2000records)
and i removed record in the first file, then it will not read for the rest of the file but only get the first 499 record?

Can I use the UDP for storing in difference file?

Sounds like you need to use a database if your storing multiple files and that number of records.

I would like to but the server only allowed to stored using file system.

Quote:

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Originally Posted by chthong

If i already storing records in 4 files (4 x 500 = 2000records) and i removed record in the first file, then it will not read for the rest of the file but only get the first 499 record?

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Just out of couriosity... why are you limited to 500 records?

Quote:

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Originally Posted by chthong

Can I use the UDP for storing in difference file?

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Yes, but then saving and loading a file is done by Put and Get, not Input and Print/Write, since it's a binary file.

I also not sure, she didn't tell me why 500 records.
Do you have examples storing UDP in multiple files? Thanks

If this "records" are stored in one line per record, you can quite easly determine how many of theme are there:

VB Code:

Dim records As Integer
    Open "c:\test1.txt" For Input As #1
        records = UBound(Split(Input(LOF(1), 1), vbCrLf)) + 1
    Close #1
        Debug.Print "records: " & records

Also, i think it's a waist of time to work with text files in this mather. It would be much much easier to do it with a database, as RobDog already sead.