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Re: IDL make_dll and unresolved externals [message #69703 is a reply to message #69690]

Mon, 01 February 2010 03:00

Wout De Nolf
Messages: 194
Registered: October 2008

Senior Member

On Sat, 30 Jan 2010 19:03:59 -0800 (PST), james
<james5452003@yahoo.com> wrote:

> Hi,
> I am trying to use the call_external for C code and am using make_dll
> to compile the dll. The problem I am having is with the make_dll. I
> am including another library (opencv) in the c code and it seems to
> compile okay when I just declare a (opencv type) variable from that
> library. But when I include a call of any one of the functions from
> the (opencv) library in the code, there is unresolved external
> compiler error on it.
>
> Any suggestions on what I am doing incorrectly? Can other libraries
> like opencv be used for IDL?

Ok, just to make sure I understand: you make a dll with export
functions in portable calling convention. In one of these functions
you call a function from the opencv library. Using call_external gives
some kind of error which you expect comes from calling the opencv
function.

Did you link opencv statically or dynamically (check with depency
walker). If it's dynamic linking, make sure your dll is finding the
opencv dll.

Did you try calling your dll from C? Did is work?

You can also attach a debugger to idl_opserver and set a breakpoint
just before the error occurs. Easy in visual studio express (free),
not sure what you have...

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[Message index]

		Re: IDL make_dll and unresolved externals By: Wout De Nolf on Wed, 03 February 2010 02:50
		Re: IDL make_dll and unresolved externals By: james on Tue, 02 February 2010 18:13
		Re: IDL make_dll and unresolved externals By: Wout De Nolf on Mon, 01 February 2010 03:00

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