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Index > Windows > Undefined symbol: 'get_Handle'

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Meeky



Joined: 07 Jun 2009
Posts: 1
Meeky
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:
    
Post 08 Jun 2009, 03:55
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IronFelix



Joined: 09 Dec 2004
Posts: 141
Location: Russia, Murmansk region
IronFelix
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.
Post 08 Jun 2009, 11:18
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