On 15/8/06 18:48, "Jonathan Johnson" <[EMAIL PROTECTED]> wrote:
>
> On Aug 15, 2006, at 12:46 PM, Mars Saxman wrote:
>
>>
>> On Aug 15, 2006, at 10:33 AM, Daniel Stenning wrote:
>>
>>> But I specifically need to pass the pointer of my structure to an
>>> external
>>> DLL function which takes a pointer to a structure. Is there no way
>>> to do
>>> this?
>>
>> Yes: declare the parameter ByRef.
So I can do this ?:
Declare Sub myDLLcall Lib "mylibrarypath" (pStruct as Ptr)
or maybe:
Declare Sub myDLLcall Lib "mylibrarypath" ( ByRef pStruct as myStructure)
And then can I do this ??
Sub myRBmethod( ByRef rStruct as myStructure )
call myDLLcall( rStruct )
End Sub
And then in my main code do this ?:
Dim mystruc as myStructure
Call myRBmethod( mystruc )
?
Although memoryblocks are great, I think its a pain that we have to keep
converting to and fro memoryblocks all the time, when really we are dealing
with structures ( and their pointers )
>>
>>> Also - how can I convert a pointer to a structure obtained from a
>>> Dylib call
>>> into an RB structure reference ?
>>
>> You can't do that directly, but you can dereference the pointer:
>>
>> Dim foo As Ptr, bar As someStructure
>> bar = foo.someStructure
that's fine if we want a copy of the structure values, but not if we need to
keep playing with the original structure "in place"
>
> Disregard my previous suggestion: this is much easier and better :)
>
> -Jon
>
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