This is the mail archive of the cygwin mailing list for the Cygwin project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: MSVC-dll under cygwin








On Thu, Dec 02, 2004 at 04:30:56PM +0100, Mikael ?sberg wrote:
Hello, I was under the impression that using a Cygwin-compiled DLL
under MSVC was extremely difficult, if not impossible, but using a
MSVC-compiled DLL with programs compiled under Cygwin is possible?  I
have test program that first calls LoadLibrary() and then for each
function in the DLL it wants to call I call GetProcAddress().  However,
when I try to call any function the program segfaults (the function
pointers are not NULL).  The same test program works if compiled using
MSVC.  Am I mistaken that this should work or is there an error
somewhere?

Since cygwin itself uses all sorts of non-cygwin dlls, it is a safe assumption that it must be able to use non-cygwin dlls.

However, if you are using stdio from msvcrt, you may run into problems.

cgf


Thanks for the quick reply. I may have found the problem (will test later). In one of the functions, a parameter was declared to be const but it was declared as non-const in the definition. Seems like a mistake that can cause all sorts of weird problems.

/ Mikael



Okay, now I have tested the code and something is still not right. The DLL
contains functions for working with the Windows registry and my problem
is that if I call, for example, the function create_registry_key(), the string
parameter denoting the name of the key is garbled if called from a program
compiled under Cygwin.
The exact signature of that DLL-function is:
HKEY create_registry_key(const HKEY parent_key, const std::string& name);


This doesn't happen if I test the DLL with a

program compiled under MSVC. Any idea what might be wrong?



/ Mikael



--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]