Undefined symbol: 'get_Handle'

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Meeky

Joined: 07 Jun 2009
Posts: 1

Meeky 08 Jun 2009, 03:55

I get an error "Undefined symbol: 'get_Handle'" with this snippet:

Code:

proc LoadImageFromMem uses esi edi, pImageAddr:DWORD, ImageLen:DWORD
local pPicture:DWORD
...
comcall [pPicture],get_Handle

Whereas IPicture is defined as struct:

Code:

struc IPicture
 {
    .handle                  dd  ?
   virtual at 0
    .QueryInterface          dd  ?
    .AddRef                  dd  ?
    .Release                 dd  ?
    .get_Handle              dd  ?
    .get_hPal                dd  ?
    .get_Type                dd  ?
    .get_Width               dd  ?
    .get_Height              dd  ?
    .Render                  dd  ?
    .set_hPal                dd  ?
    .get_CurDC               dd  ?
    .SelectPicture           dd  ?
    .get_KeepOriginalFormat  dd  ?
    .put_KeepOriginalFormat  dd  ?
    .PictureChanged          dd  ?
    .SaveAsFile              dd  ?
    .get_Attributes          dd  ?
   end virtual
 }

What can I do with it?
Also, where can I get definition of IStream and IUnknown interfaces, so I could do something like this?

mov eax,[pStream]
push eax
mov eax,[eax]
call [eax+IStream.IUnknown.Release]

Code:

08 Jun 2009, 03:55

IronFelix

Joined: 09 Dec 2004
Posts: 141
Location: Russia, Murmansk region

IronFelix 08 Jun 2009, 11:18

Meeky, check "macro\com32.inc" file in fasm includes. There is "interface" macro in this file which you may use to declare interfaces and call their methods. Or you may use next addition after your IPicture struc:

Code:

virtual at 0
 IPicture IPicture
end virtual

By the way, "comcall" macro requires the type of interface pointer, so it should be as follows:

Code:

comcall [pPicture],IPicture,get_Handle

As for definitions of IStream and IUnknown - you may use both of ways to define them - via "interface" or in your own way.

If you wish to inherit IUnknown without repeating their methods - it requires additional macros. Maybe this link will be useful for you:

http://board.flatassembler.net/topic.php?t=9896

Regards.

08 Jun 2009, 11:18

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