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Index > Windows > wether to use invoke or cinvoke for dll functions

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shutdownall



Joined: 02 Apr 2010
Posts: 518
Location: Munich
shutdownall
Maybe this question have been answered already but could not find relevant information with search function in adaquate time. Shocked

How do I know wether to use invoke or cinvoke macro to call a DLL function ?
I think the MS DLL's are all compatible with the invoke macro but what about custom DLL's not designed by MS ? How can I obtain the calling procedure if not provided in documents ?

Concrete case is for this API
http://www.ftdichip.com/Support/Documents/ProgramGuides/D2XX_Programmer%27s_Guide%28FT_000071%29.pdf

But would be good to know in general for future / other provided API's.

Thanks for help. Very Happy
Post 24 May 2012, 17:35
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
By looking at FTD2XX.H in example 1 I'd say they are stdcall and therefore you must use invoke. The reason I think they are stdcall is because they are marked WINAPI (which is defined as __stdcall).
Post 24 May 2012, 18:30
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17450
Location: In your JS exploiting you and your system
revolution
Yes, you use invoke. This is from my code:
Code:
       invoke  FT_SetBaudRate,[comm_handle],FT_BAUD_115200    
Post 24 May 2012, 20:46
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shutdownall



Joined: 02 Apr 2010
Posts: 518
Location: Munich
shutdownall
Thanks for information.

But is there a general rule what macro to use under which circumstances (if documentation is not provided or not with that detail) ?
Post 24 May 2012, 21:50
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17450
Location: In your JS exploiting you and your system
revolution
shutdownall wrote:
But is there a general rule what macro to use under which circumstances ...
Yes.

cinvoke for ccall
invoke for stdcall
shutdownall wrote:
... (if documentation is not provided or not with that detail) ?
Use a debugger and check the return type.

ret = ccall
ret imm = stdcall
Post 24 May 2012, 22:23
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