Reading a file that was created with Array.Length? AGK V2

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kozma_11

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Joined: 17th Sep 2003

Location: Scotland

Posted: 6th Jul 2016 21:27

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Hi,

I've been struggling to find a solution to this one, any help appreciated!

Say I created a file using the following code, and my array has 5 entries (i.e. EClub.Length = 5)

+ Code Snippet

Function ClubsSaveToDevice()
rem if save file exists, delelte it first

If GetFileExists("EditClubsSave.txt")=1
DeleteFile("EditClubsSave.txt")
EndIF

rem save game
fileID = openToWrite("EditClubsSave.txt", 0)
if fileIsOpen(FileID) = 1


rem clubs details
For i = 0 to EClub.Length
writeString(fileID, EClub[i].Name)
writeString(fileID, EClub[i].ID)
writeString(fileID, EClub[i].pword)
writeString(fileID, EClub[i].package)
writeInteger(fileID, EClub[i].clubtype)
Next i	

closeFile(fileID)

EndIF

EndFunction

How can I then read in the data when it won't know that there is 5 entries in the array? I've tried using a repeat until but I just get an error saying the Array is out of bounds.

+ Code Snippet

Function ClubsLoadToDevice()
rem if save file exists, delelte it first

If GetFileExists("EditClubsSave.txt")=1
	
fileID = openToRead("EditClubsSave.txt")
if fileIsOpen(FileID) = 1


rem clubs details
i = 0
	
repeat
EClub[i].Name = ReadString(fileID)
EClub[i].ID = ReadString(fileID)
EClub[i].pword = ReadString(fileID)
EClub[i].package = ReadString(fileID)
EClub[i].clubtype = ReadInteger(fileID)
inc i
until fileEOF(FileID) > 0	


closeFile(fileID)

EndIF
EndIF

EndFunction

El Presidente

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Markus

Valued Member

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Joined: 10th Apr 2004

Location: Germany

Posted: 6th Jul 2016 22:02 Edited at: 6th Jul 2016 22:04

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its more easy if you write the count also into the file EClub.Length
at load you read it have a loop count and can define the array.

AGK (Steam) V2.0.19 : Windows 10 Pro 64 Bit : AMD (16.3.2) Radeon R7 265 : Mac mini OS X 10.10 (Yosemite)

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blink0k

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11

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Joined: 22nd Feb 2013

Location: the land of oz

Posted: 6th Jul 2016 22:29 Edited at: 6th Jul 2016 22:33

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The .insert() Method works quite well for these situations.

+ Code Snippet

Function ClubsLoadToDevice()
rem if save file exists, delelte it first
 
If GetFileExists("EditClubsSave.txt")=1
     
fileID = openToRead("EditClubsSave.txt")
if fileIsOpen(FileID) = 1
 
 
rem clubs details
i = 0
ETemp as EclubType // or whatever the type of your array is
EClub.length = -1
     
repeat
ETemp.Name = ReadString(fileID)
ETemp.ID = ReadString(fileID)
ETemp.pword = ReadString(fileID)
ETemp.package = ReadString(fileID)
ETemp.clubtype = ReadInteger(fileID)
EClub.insert(ETemp)
until fileEOF(FileID) > 0    
 
 
closeFile(fileID)
 
EndIF
EndIF
 
EndFunction

this is a good read for all new array methods;
https://www.appgamekit.com/documentation/guides/12_array_changes.htm

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BatVink

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Joined: 4th Apr 2003

Location: Gods own County, UK

Posted: 7th Jul 2016 07:45

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You have used an UNTIL loop.If you use a WHILE loop it will exit before you get an out of bounds error.
UNTIL always processes the loop one more time after the condition is met.

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kozma_11

21

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Joined: 17th Sep 2003

Location: Scotland

Posted: 10th Jul 2016 18:48

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Thanks for the replies guys, some good advice. Hopefully I can fix it now!

El Presidente

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AppGameKit Classic Chat / Reading a file that was created with Array.Length? AGK V2