Many Lists
Hi,
I'm writing a program, the way it needs to work is, i need to have a listbox with a list of text files...and in each text file there is about 130,000 lines. I need to have a way to go through each item in the file then go on to the next file, but the thing is, i cant just do a loop and go that way, i have to be able to get the next item in random places in the program, so i was thinking a function but i cant think of a way to do this, because it would be innefective to jsut keep openin gthe file and scanning to the place in the file to get the next item...can anyone help me out with this?
I'm writing a program, the way it needs to work is, i need to have a listbox with a list of text files...and in each text file there is about 130,000 lines. I need to have a way to go through each item in the file then go on to the next file, but the thing is, i cant just do a loop and go that way, i have to be able to get the next item in random places in the program, so i was thinking a function but i cant think of a way to do this, because it would be innefective to jsut keep openin gthe file and scanning to the place in the file to get the next item...can anyone help me out with this?
>be able to get the next item in random places in the program
What are the rules to abandon the file we have open and go to the next one?
What are the rules to abandon the file we have open and go to the next one?
ASKER
here is what i was thinking, just load 30,000 items at a time to another listbox, then when the listbox that contains the items gets empty load up another 30,000 until we hit the end of the lsit, then goto the next list...but it just doesnt seem effective to me. AND ITS NOT RANDOM ITS EACH LINE ONE AFTER ANOTHER
ASKER
I have not received an answer for my question, I'm going to delete it. If anyone has any last comments that they think may help please post them and i wont delete the question.
-Brian
-Brian
Listening for updates, and hope that Experts respond here with help for you.
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Moondancer - EE Moderator
We are doing to do some server transitioning today and may experience a little down time.
Moondancer - EE Moderator
Brian, I am still trying to understand your problem. It sounds as if you want to open each file in sequential mode, read each line and process it. A structured way to do that would be with a loop:
Dim i As Integer
Dim hFile As Integer
Dim strLine As String
For i = 0 To lstFiles.ListCount - 1
hFile = FreeFile
Open lstFiles.List(i) For Input As #hFile
Do While Not EOF(hFile)
Line Input #hFile, strLine
'code to process line
Loop
Next i
So why isn't this approach suitable?
Dim i As Integer
Dim hFile As Integer
Dim strLine As String
For i = 0 To lstFiles.ListCount - 1
hFile = FreeFile
Open lstFiles.List(i) For Input As #hFile
Do While Not EOF(hFile)
Line Input #hFile, strLine
'code to process line
Loop
Next i
So why isn't this approach suitable?
Forgot to close:
Dim i As Integer
Dim hFile As Integer
Dim strLine As String
For i = 0 To lstFiles.ListCount - 1
hFile = FreeFile
Open lstFiles.List(i) For Input As #hFile
Do While Not EOF(hFile)
Line Input #hFile, strLine
'code to process line
Loop
Close #hFile
Next i
Dim i As Integer
Dim hFile As Integer
Dim strLine As String
For i = 0 To lstFiles.ListCount - 1
hFile = FreeFile
Open lstFiles.List(i) For Input As #hFile
Do While Not EOF(hFile)
Line Input #hFile, strLine
'code to process line
Loop
Close #hFile
Next i
As what I said, you can read the whole file in one shot and then use split function to separate each line.
ie.
dim arr, i as long
arr = split(s, vbcrlf)
for i=0 to ubound(arr)-1
' process your string
'arr(i)
next
Another thing I want to point out is listbox is slow if you add more than 30000 items, use listview
for more info
https://www.experts-exchange.com/jsp/qManageQuestion.jsp?ta=visualbasic&qid=20299351
ie.
dim arr, i as long
arr = split(s, vbcrlf)
for i=0 to ubound(arr)-1
' process your string
'arr(i)
next
Another thing I want to point out is listbox is slow if you add more than 30000 items, use listview
for more info
https://www.experts-exchange.com/jsp/qManageQuestion.jsp?ta=visualbasic&qid=20299351
ASKER
here is what i was thinkin, write a sub to load list items to a INVISIBLE listbox, and ill load 30,000 items at a time and when the list gets empty, it will just call the sub again, and the sub will ahve the place it left off as a static....do u ppl think that would work?
ASKER CERTIFIED SOLUTION
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Hi BrianGEFF719,
It appears that you have forgotten this question. I will ask Community Support to close it unless you finalize it within 7 days. I will ask a Community Support Moderator to:
Accept PaulHews's comment(s) as an answer.
BrianGEFF719, if you think your question was not answered at all or if you need help, just post a new comment here; Community Support will help you. DO NOT accept this comment as an answer.
EXPERTS: If you disagree with that recommendation, please post an explanatory comment.
==========
DanRollins -- EE database cleanup volunteer
It appears that you have forgotten this question. I will ask Community Support to close it unless you finalize it within 7 days. I will ask a Community Support Moderator to:
Accept PaulHews's comment(s) as an answer.
BrianGEFF719, if you think your question was not answered at all or if you need help, just post a new comment here; Community Support will help you. DO NOT accept this comment as an answer.
EXPERTS: If you disagree with that recommendation, please post an explanatory comment.
==========
DanRollins -- EE database cleanup volunteer
per recommendation
SpideyMod
Community Support Moderator @Experts Exchange
SpideyMod
Community Support Moderator @Experts Exchange
ie.
Dim ff As Integer, Filename As String, s As String
Filename = "your file"
ff = FreeFile
Open Filename For Binary Access Read Lock Read Write As #ff
s = Space$(LOF(ff))
Get #ff, , s
Close ff