deleting types (entity doesnt exist)

Blitz3D Forums/Blitz3D Programming/deleting types (entity doesnt exist)

slenkar

(Posted 2004) [#1]

For s.ship=Each ship
If s\hull=0
FreeEntity s\ship_Handle
Delete s
EndIf
Next

Every second I call this function to delete the types of dead ships and to free their entities.

I recently re-wrote a large part of my game and there is now an error.

for s.ship=each ship
moveentity s\ship_handle 0,0,s\speed
next

The above function causes a (entity does not exist) error.

I used to be able to do this with no errors and I cant work out what I changed to make it go wrong.

What is the best way of using the debuglog to find out what went wrong?

Bot Builder

(Posted 2004) [#2]

make that function

for s.ship=each ship
 debuglog s\ship_handle 
 moveentity s\ship_handle 0,0,s\speed
next

I bet you will find that it is one of your first or last ships. if not, then somthing really is odd.

slenkar

(Posted 2004) [#3]

There is a long list of entity numbers, how do I tell if it is the last ship?

The ships are successfully moved at the beginning of the game but as soon as one dies the error happens.

fredborg

(Posted 2004) [#4]

It sounds like you are running your two pieces of code in the same loop, like this:

For s.ship=Each ship
If s\hull=0
FreeEntity s\ship_Handle
Delete s
EndIf
moveentity s\ship_handle 0,0,s\speed
next

If that's the case then it needs to go like this instead::

For s.ship=Each ship
If s\hull=0
FreeEntity s\ship_Handle
Delete s
Else
moveentity s\ship_handle 0,0,s\speed
EndIf
next

If that's not the problem, then it might be helpful to see a bit more code...

slenkar

(Posted 2004) [#5]

I have the 2 operations in different functions.
There is too much code to post here so Ill give the best description

Update_small_ships()

is the function that is called every loop and moves the ships forward

Choose_target()

Is the function that is called once every second and deletes and frees entities.

What I am doing used to work.

My ships used to have a lot of different types but on someones advice I put every single ship into the same type and implemented the use of entityname and object() commands to speed up type access.

I dont know why the error occurs still.

Bot Builder

(Posted 2004) [#6]

There is a long list of entity numbers, how do I tell if it is the last ship?

which ever one is 0.

The ships are successfully moved at the beginning of the game but as soon as one dies the error happens.

ah. didn't know that.

I don't think that that's it, fredborg. It might be, however, wouldn't that be a type does not exist error instead of a entity does not exist?

Well, try this:

for s.ship=each ship
 if s\ship_handle then moveentity s\ship_handle 0,0,s\speed
next

if there's still an error, then that means you're freeing the entity but not the type - somehow :P

slenkar

(Posted 2004) [#7]

Its weird because I use the types to count the number of ships and display it on the screen.

I started off with 20 ships, it went down to 19 as it should, this means that the type was deleted successfully.

I also have a similar error with entitypicking, using the handle() and object() commands.

It seems to have an error when I do this:

s\bullet_collision=EntityPick (s\ship_Handle,20)
hit_ship$=EntityName(s\bullet_collision)
If hit_ship>0
shoot(s\bullet_handle,hit_ship,s\colour,10,0)
EndIf

When I use the handle() and object() commands putting
if s\bullet_collision>0
used to work but it always equals something bigger than zero even when it doesnt pick an entity when I use object and handle commands.
Doesnt make much sense.

slenkar

(Posted 2004) [#8]

I just had a look at the debuglog again and the ship that doesnt exist has a hull of 20 when it should be zero.

I dont know whats going on.