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Re: Can open() from console app, not from dll
- From: Danny Smith <danny_r_smith_2001 at yahoo dot co dot nz>
- To: Massimiliano Mirra <mmirra at libero dot it>
- Cc: cygwin at cygwin dot com
- Date: Wed, 2 Apr 2003 11:13:36 +1000 (EST)
- Subject: Re: Can open() from console app, not from dll
--- Massimiliano Mirra <mmirra at libero dot it> wrote: > Danny Smith
<danny_r_smith_2001 at yahoo dot co dot nz> writes:
> >> I am able to open a file and write into it from a console application,
> >> but the same fails when done from within a function that is stored in
> >> a DLL and called from a Visual Basic application.
> > VB expects stdcall convention.
> > Try adding WINAPI to OpenSomething
> Hmmm. If I understand correctly, and it's to be written ``int WINAPI
> OpenSomething'', it seems that it becomes unable to even call the
> ``Can't find DLL entry point OpenSomething in foo.dll''
In this specific case, the __stdcall isn't really necessary, since your are
passing parameters. In general however, VB expects the callee to cleanup the
I added the __stdcall qualifier OpenSomething and built dll
gcc --shared -ofoo.dll -Wl,--add-stdcall-alias foo.c
This will export OpenSomething at 0 as well as the alias OpenSomething
I put the dll where Excel could find it
and added this to a module in a worksheet:
Declare Function OpenSomething Lib "foo.dll" () As Integer
and when I called OpenSomething from the worksheet it opened the file and wrote
to it. No problem
Ditto if I build with -mno-cygwin.
However, if your VB app is calling MS runtime IO functions to do other things
you may have cygwin1.dll vs MS runtime conflicts.
Have you tried with -mno-cygwin?
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