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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
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.
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.
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
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?
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