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Re: DLL and VB problems
The options I gave to gcc are:
For building the DLL:
gcc -c -o dllhello.o dllhello.c
gcc -shared -o dllhello.dll dllhello.o -Wl,--out-implib,libdllhello.a
For building the program:
gcc -c -o hello.o hello.c
gcc -mwindows -o hello.exe hello.o -L. -ldllhello
The GCC version I am using is: gcc (GCC) 3.3.1 (cygming special)
Yes, I can successfully call this dll from a C program.
Thanks.
Paul
On Thu, 16 Oct 2003, Paul Bezzam wrote:
>
> Hello,
>
> Please ignore my previous message; I made a mistake in the client C file.
> I corrected it, and the C client calls the DLL perfectly.
>
> But I tried calling from a VB client, and it works fine for the first
> time; Running again causes the application to close.
>
> Any insight would be greatly appreciated.
>
> Thanks.
>
> Paul
>
> On Thu, 16 Oct 2003, Paul Bezzam wrote:
>
> >
> > Hello,
> >
> > I am sorry that I am not very clear...
> >
> > Below is the problem:
> >
> > I wrote C client to this dll and when I try to compile the client to use
> > the dll using the command: gcc -o hello.exe hello.o -L. -ldllhello, I get
> > the following error:
> > /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/../../../libcygwin.a(libcmain.o)(.text+0x7
> > c): undefined reference to `_WinMain@16'
> > collect2: ld returned 1 exit status
> >
> > PS: dllhello is the dll; hello.c is the client C program.
> >
> > Thank you.
> >
> > Paul
> >
> >
> >
> > On Thu, 16 Oct 2003, Igor Pechtchanski wrote:
> >
> > > On Thu, 16 Oct 2003, Paul Bezzam wrote:
> > >
> > > > Hello,
> > > >
> > > > I have created a DLL using gcc on Cygwin, and I wrote a client in VB
> > > > accessing this DLL. The application runs fine for the first time, but
> > > > when run again, it crashes. I have to close the application and run it to
> > > > work successfully.
> > > >
> > > > Can anyone please give me some directions.
> > > >
> > > > Thanks.
> > > > Paul
> > >
> > > "Crashes" is a very vague word. Where does it crash? What options did
> > > you give to GCC? What version of GCC are you using? Can you use this DLL
> > > from a C program?
> > > Igor
> > > --
> > > http://cs.nyu.edu/~pechtcha/
> > > |\ _,,,---,,_ pechtcha@cs.nyu.edu
> > > ZZZzz /,`.-'`' -. ;-;;,_ igor@watson.ibm.com
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> > > '---''(_/--' `-'\_) fL a.k.a JaguaR-R-R-r-r-r-.-.-. Meow!
> > >
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