Inline asm question

[fsw]

How to obtain the gadget OS handle with inline asm

In the 'PureBasic library descriptor.txt' file there is a info about the PB_GadgetStructure but I failed to obtain any information from this structure.

Any help is truly appreciated.

Another question would be how to use 'CustomData' and 'CustomData2'...

Thanks

[fsw]

NOBODY

[freak]

Code: Select all

Structure PB_GadgetStructure
  Gadget.l    ; OS Gadget pointer (HWND)
  *VirtualTable
  CustomData.l  ; Can be used to store extra infos on this gadget
  CustomData2.l ; Can be used to store extra infos on this gadget
EndStructure

#MyGadget = 1

OpenWindow(0, 0, 0, 300, 300, #PB_Window_SystemMenu|#PB_Window_Screencentered, "example")
CreateGadgetList(WindowID())
TreeGadget(#MyGadget, 0, 0, 300, 300)

; _PB_Gadget ObjectsArea is a pointer to an array of PB_GadgetStructur structures.
; one for each gadget.
; We move that value to the GadgetBase variable
;
GadgetBase.l
!extrn _PB_Gadget_ObjectsArea
!mov eax, [_PB_Gadget_ObjectsArea]
!mov [v_GadgetBase], eax

; calculate the offset of the PB_GadgetStructure for our Gadget:
;
*MyGadget.PB_GadgetStructure = GadgetBase + SizeOf(PB_GadgetStructure) * #MyGadget

Debug *MyGadget\Gadget
Debug GadgetID(#MyGadget)

Repeat
Until WaitWindowEvent() = #PB_EventCloseWindow

The virtualtable member is a pointer to the list of functions for this
Gadget.
The CustomData and CustomData2 members are for the internal use
of the Gadget functions. So they can store values for each gadget.

TreeGadget for example stores the Item count in the CustomData
member, because the API function that count's tree items only returns
16bit values, and so limits the number of entrys to 65535 entrys. But
because the item count is stored here, the full 32bit range is avaiable.
CustomData2 contains a pointer to some internal data.

I can't tell you much about what other Gadgets store there, as i don't
know their sources

btw, wha exactly do you want to do?

Timo

[fsw]

Thanks Freak.

When I read the little text file coming with the SDK I got the impression that CustomData and CustomData2 are free to use Custom

But you are saying that they are already internally used - right

So it's a BAD idea to use them and store something else in it, because it would screw up the whole thing - right

And I thought I found a LEGAL place to store additional stuff for each gadget...

[freak]

Yes, it is free to use, but only for the functions that create the Gadget

At least the Gadgets i have written make lot's of use of it, so better don't
overwrite the values there.

Timo