Breaking Down Packets - GameCreators Forum

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Penguin Boy

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Joined: 22nd Apr 2006

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Posted: 20th Sep 2006 07:25

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Ok, reading through the multiplayer tutorial for DBP it mentions somthing about "Breaking down packets".

It states:
So the player sending their data would have a packet string that looks like this (using "*" as a divider between each value):

packet$=playername$+"*"+str$(camera position x())+"*"+str$(camera position y())+"*"+str$(camera position z())+"*"+str$(camera angle x())+"*"+str$(camera angle y())+"*"+str$(camera angle z())+"*"+speed$+"*"+fireweapon$+"*"+ping$

The receiving player would then see something like this in the received string when the packet is detected:

"Bill10424*543.1122*58.2311*801.8790*44.3250*172.0093*94.2210*15*0*2480"

The received string can then be broken down within the program using the "*" dividers and assign the values to the needed variables. This can be done by getting each digit using the mid$() command until the value equals "*", then advance to the next needed value.

I looked up the mid$() command, but i still don't understand how to actually "break it down", can somone please explain how to do this to me? Even better could somone please post a code snippet?

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Sonic 91 Software

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Posted: 20th Sep 2006 09:36

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Quote: "Ok, reading through the multiplayer tutorial for DBP"

this is the DB forum, not the DBP forum.

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Penguin Boy

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Posted: 20th Sep 2006 09:52

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Whoops!

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Ginga

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Joined: 3rd Jul 2006

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Posted: 20th Sep 2006 13:17

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hey penguin. The process would be the same for either version.

Theres 2 ways i use to do it, which way you should use depends on if you know how many variables are within the packet.

First Way - Knowing how many

+ Code Snippet

 For I = 1 to Len(Packet$)
 Dim A(9)
 B = 0
 ` Find the breakers and save the position
 If Mid$(Packet$,A)="*" 
 Inc B
 A(B)=I
 EndIf
 Next I

 ` Now to get the values
 ` I'm Only going to do the first 2
 Dim Pack(B)
 ` Value 1
 Pack$(1) = Left$(Packet$,A(1)-1)
 ` with out the -1 the very last character would be the "*"
 ` Value 2 - pretty much the same
 TEMP$ = ""
 Temp$ = Left$(Packet$,A(2)-1)
 Pack$ = Right$(Temp$,(A(2)-1)-A(3))
 ` Repeat till End

The Second way - Not knowing the total variables
Its pretty much the same, but you need to count the "*"s first

+ Code Snippet

 For I = 1 to Len(Packet$)
 If Mid$(Packet$,I)="*" then Inc B
 Next I
 Dim A(B)
 `use code from above (may need to modify it a bit)

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