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Can you spot the problem?

Blitz3D Forums/Blitz3D Programming/Can you spot the problem?

RifRaf(Posted 2009) [#1]
Ok, this is weird. I have a type ClientMap.Mapdata that is getting nulled if I leave a while/wend loop, and I cant seem to figure out why. Heres a snippet.

.lobbystart
While Not KeyDown(1)
	If inlobby=1 Then 
		mp$=spawnlobby$(lobbycode)
         	removelobby() 
    	        clientmap.mapdata=clientloadmap(mp$)
                If clientmap.mapdata=Null Then 
			lobbycode=1
 		Else
                        inlobby=0
			Mic=CreateListener (cam,.3,5,.5)
			home.tank=loadtank("media\tanks\tank1.b3d")
			droptank home.tank,-10,100,-50
			removetank(home.tank)
			home.tank=loadtank("media\tanks\tank1.b3d")
                        settankactive(home.tank,1)
			EntityParent mic,home\main,0
			PointEntity cam,home\main
			droptank home.tank,-10,100,-50
			;connect to server
        	EndIf         
	        framePeriod = 1000 / gameFPS
	        frameTime = MilliSecs () - framePeriod
	Else
       	     checktween()
    	     LockBuffer   BackBuffer()
    	     UnlockBuffer BackBuffer()
    	     RenderWorld(frametween)
	     If dofmode Then 
	           CustomPostprocessDOF 300, 400, 1 , 3, 0.07, 0
   	  	   RenderPostprocess FE_DOF
	     EndIf
	     Flip False
	EndIf
	If clientmap.mapdata=Null Then RuntimeError "clientmap IS valid.. this never errors out"
Wend
If clientmap.mapdata=Null Then RuntimeError "after esc is hit and loop broken.. now it always null. why?"



puki(Posted 2009) [#2]
Interesting.

I have known similar instances in Blitz3D and wondered if it was just me. I usually recode what I am doing until the problem goes away.

However, I too have been in a similar position.

You are clearly checking the same thing both before termination of the While/Wend and straight afterwards.

What you can do is shunt a whole load of Null checks all the way through that While/Wend loop - just to make sure.


RifRaf(Posted 2009) [#3]
oh, and just fyi, i lock and unlock the backbuffer because it removes input lag in windowed and debug modes.


puki(Posted 2009) [#4]
You are leaving the loop though - which we cannot see - you don't goof it up do you outside of the loop?


RifRaf(Posted 2009) [#5]
Doh. think i got it.
Edit.. yes. I swear the longer I sit at this PC the dumber I get.
To clarify, I was using the wrong type of loop, I need the loop to end at the bottom of the snippet, not the top. (while vs repeat)

.lobbystart
		framePeriod = 1000 / gameFPS
		frameTime = MilliSecs () - framePeriod
Repeat
 	    If inlobby=1 Then 
			mp$=spawnlobby$(lobbycode)
       		removelobby() 
    		clientmap.mapdata=clientloadmap(mp$)
        If clientmap.mapdata=Null Then 
			lobbycode=1
 		Else
            inlobby=0
			Mic=CreateListener (cam,.3,5,.5)
			home.tank=loadtank("media\tanks\tank1.b3d")
			droptank home.tank,-10,100,-50
			removetank(home.tank)
			home.tank=loadtank("media\tanks\tank1.b3d")
            settankactive(home.tank,1)
			EntityParent mic,home\main,0
			PointEntity cam,home\main
			droptank home.tank,-10,100,-50
			;connect to server
		EndIf         
	framePeriod = 1000 / gameFPS
	frameTime = MilliSecs () - framePeriod
	Else
       	checktween()
    	;LockBuffer FrontBuffer()
    	LockBuffer   BackBuffer()
    	UnlockBuffer BackBuffer()
    	RenderWorld(frametween)
		If dofmode Then 
    		;-CustomPostprocessDOF 300, 400, 1 , 3, 0.07, 0
    		;-RenderPostprocess FE_DOF
		EndIf
	    Flip False
	EndIf
Until KeyHit(1)


Thanks for posting Puki.


puki(Posted 2009) [#6]
I bet you tried my idea of injecting the Null test to find it.


RifRaf(Posted 2009) [#7]
nah, I was re reading this topic and it hit me while looking at the codebox, that I was using the wrong loop.