About memory freeing ?

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FlameDuck

I don't understand why my memory is not free after process ?

Because you aren't dereferenceing your banks, ie they still exsist as valid objects, and so aren't being garbagecollected.

Try this code instead:

Import Pub.ZLib

FlushMem
Print "MEM USED 1 : "+MemAlloced()+" / "+MemUsage()

Local MySourceBank:TBank=TBank.load("C:\Dev\42ninjas\bin\logo.png") 

Print "MEM USED 2 : "+MemAlloced()+" / "+MemUsage()

Local MyOutBank:TBank=CompressBank(MySourceBank)
MyOutBank.Save("C:\Dev\logo.bin") 

MyOutBank = Null
MySourceBank = Null

FlushMem

Print "MEM USED 3 : "+MemAlloced()+" / "+MemUsage()

End

Oh and I leave you with this quote from the manual:

Function MemFree( mem:Byte Ptr,size ) Free allocated memory.

The memory specified by mem must have been previously allocated by MemAlloc or MemExtend.