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Re: libcurl using stdcall on windows

From: CL <jscript_at_gmail.com>
Date: Thu, 24 Feb 2005 12:54:46 -0500

Thanks for the feedback. That certainly led me back on track again.
In addition to adding __cdecl to the callback function, I also
explictly placed __cdecl on all functions that I called in
<libCurl.h>. Considering that libCurl always uses __cdecl calling
convention, should this change be included in the latest CVS version
so that others building Win32 applications with __stdcall doesn't run
into the same problem?

Calu

On Thu, 24 Feb 2005 08:07:52 -0800 (PST), Jeff Phillips <jeff_at_jeffp.net> wrote:
> Hello CL,
>
> I don't recommending building libcurl with the stdcall
> convention, because you won't be able to invoke
> libcurl's vararg functions (like dfprintf_format and
> curl_formadd) if you do this.
>
> That said, when you rebuild libcurl as cdecl, the
> trick will be to ensure that the various libcurl
> callbacks in your application are declared as cdecl
> rather than stdcall, because libcurl, when compiled as
> cdecl, will expect to clean the stack after invoking a
> callback. So here's an example:
>
> size_t __cdecl write_function(char* szptr,
> size_t sz, size_t nmemb, void* pvData)
> {
> return sz * nmemb; // for now
> }
>
> Set up this callback with:
>
> curl_easy_setopt(easy, CURLOPT_WRITEFUNCTION,
> write_function);
>
> Hope this helps,
> Jeff
>
> --- CL <jscript_at_gmail.com> wrote:
>
> > I'm trying to add libcurl to an existing windows
> > application that must
> > uses stdcall calling convention. I've added /Gz
> > (stdcall rather than
> > cdecl ) to CCDEBUG and CCNODBG in makefile.vc6. Most
> > of the souce code
> > compiled without warning/errors after adding this
> > flag. I'm only
> > getting 4 errors that complains pretty much on the
> > same problem:
> >
> > error C2152: 'function' : pointers to functions with
> > different attributes
> > warning C4024: 'dprintf_formatf' : different types
> > for formal and
> > actual parameter 2
> > error C2152: 'function' : pointers to functions with
> > different attributes
> > warning C4024: 'dprintf_formatf' : different types
> > for formal and
> > actual parameter 2
> > error C2152: 'function' : pointers to functions with
> > different attributes
> > warning C4024: 'dprintf_formatf' : different types
> > for formal and
> > actual parameter 2
> > error C2152: 'function' : pointers to functions with
> > different attributes
> > warning C4024: 'dprintf_formatf' : different types
> > for formal and
> > actual parameter 2
> >
> > I'm pretty new to libcurl, and it took nearly the
> > whole day yesterday
> > for me to figure out the 'unresolved external symbol
> > __imp__curl*'
> > errors was related to this mix use of calling
> > conventions. I
> > appreciate if anyone can point me in the right
> > direction in either:
> > 1. how to mix cdecl and stdcall in the same
> > application
> > 2. what type of changes do I have to make to fix
> > those errors listed here
> >
> > TIA
> >
> > calu
> >
>
>
Received on 2005-02-24

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