Hi All,
I was looking for a little clarification on using callbacks, memoryblocks
and declares. I thought I understood these concepts better - ugh!. :-)
This is all placed in a module, assume this structure.
typedef struct SampleStruct{
version As Integer
evaluate As Integer
}
The evaluate declaration in this structure is a callback used to evaluate a
function. I assume this needs to be declared as an integer since we cannot
declare it in a structure as a MemoryBlock.
I want to assign to this evaluate property. I have this in a routine,
Dim aSampleStruct As SampleStruct
aSampleStruct.version = 2.0
aSampleStruct.evaluate = AddressOf SampleCallbackRoutine
Since AddressOf returns a Memoryblock, this last line will not compile. How
can I get around this?
I have tried this, but is this correct?
Dim aSampleStruct As SampleStruct
aSampleStruct.version = 2.0
Dim temp As New MemoryBlock(4)
temp = AddressOf SampleCallbackRoutine
aSampleStruct.evaluate = temp.Long(0)
And what role does the MemoryBlock Ptr property play in this?
Oh and once this structure is filled, I will be passing it to a declare that
has this prototype declared as,
const CGFunctionCallbacks *callbacks
Thank you for any clarifications! It would be nice to be able to inspect
these items of the memoryblock class in the debugger.
--
Thomas C.
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