Re: [Mingw-users] dll export function - returns object pointer

[Julien L. <ju...@fa...>]

On 16/06/2006 01:57, Brian Dessent wrote:
> Hugo Leeney wrote:
> 
>> extern "C" __declspec(dllexport)  Greeting* exportCreateSalutation() {
>>         cout<<"about to return Salutation"<<endl;
>>         return new Salutation();
>> }
> 
> I don't think you can pass pointers to complex C++ objects like this
> over 'extern "C"'-defined functions.  Try removing that and using the
> mangled names in GetProcAddress and see if it's any different.
> 

Actually, Hugo mangled the name up himself ;-)
> extern "C" __declspec(dllexport)  Greeting* exportCreateSalutation()
> extern "C" __declspec(dllexport) void exportDestroySalutation(Greeting* g)

> cg = GetProcAddress(lib, "exportCreateGreeting");
> dg = GetProcAddress(lib "exportDestroyGreeting");

Hugo, you create the functions "exportCreate/Destroy" *Salutation* and 
you try to GetProcAddress on "exportCreate/Destroy" *Greeting*.
GetProcAddress thus returns 0, and then segfaults when trying cg->printf().