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Re: Problems using WIN32 api

I'll take a shot at a few of these I know.

On Thu, 13 Nov 2003, zze-BDE balg011 VAUCHER Laurent DvSI/SIReS/GRE wrote:

>   I'm trying to understand how to build an application using
> both Cygwin and (some) WIN32 APIs and I stumbled into a
> problem using exactly whet the FAQ says (even if it says
> it is not up to date).
>  Example program : main.c
> --------------------------
> #include <windows.h>
> int main(int arc, char *argv[])
> {
>   BOOL sm;
>   /* The following function is in USER32.DLL */
>   SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &sm, 0);
>   return 0;
> }
> I tried compiling like the FAQ says I should :
> > gcc -o main main.c -luser32
WFM.  Try gcc --verbose -o main main.c -luser32 and see what it is finding
for -luser32.

> All I get is "undefined reference to `SystemParametersInfoA@16`"
> Since it seems that the 'interface' libs live in /usr/lib/w32api,
> I tried to add -L/usr/lib/w32api, but the result is the same.
They should be searched automatically.

> In last resort, I did this awful thing :
> > gcc -o main main.c /usr/lib/w32api/libuser32.a
> which works !! But I'm still not satisfied with it, because
> it does not work on another libtool based project (pango),
> saying that I'm trying to include a static lib when building
> a dynamic one. So libtool refuses to pass things like
> /usr/lib/w32api/libuser32.a down to gcc and I need to
> repair the gcc command line manually.
> And I've got some more questions :
> - are the /usr/lib/w32api/libXXX.a real static libs (with code)
>    or only interface to the system DLLs?
Import libs.

> - what's the difference with libXXX.dll.a?
Not sure.

> - why is -luser32 or -lgdi32 not honored?
They should be.

> - would it be difficult to create .la files for those
>    Win32 api, so that libtool would be nice with them?
Probably not, but this is more a topic for since
they maintain w32api.

> - is someone interested in a glib/gtk+ cygwin package
>    (not a native Win32 one)?
Don't know.

Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
Phone: 314-551-8460
Fax:   314-551-8444

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