[SOLVED]Import class/struct from a DLL?

[MadPumpkin]

I just need to know how to import a class and struct from a DLL, so far I can import a function just fine,

This is the code I have

Code: Select all

#include <windows.h>
#include <iostream.h>
#include <stdio.h>
#include <conio.h>

#define MAXMODULE 50
#define DLL_IMPORT_EXPORT


typedef void (WINAPI*cfunc)();
cfunc TestModule;

int main() {
   
      HINSTANCE hLib=LoadLibrary("SPINELESSAPI.DLL");


      if(hLib==NULL) {

           cout << "Unable to load library!" << endl;
           getch();
           return 1;
      }

      char mod[MAXMODULE];

      GetModuleFileName((HMODULE)hLib, (LPTSTR)mod, MAXMODULE);
      cout << "Library loaded: " << mod << endl;


      TestModule=(cfunc)GetProcAddress((HMODULE)hLib, "TestModule");
      

      if((TestModule==NULL) )//|| (TestRect==NULL))
      {
           cout << "Unable to load function(s)." << endl;
           FreeLibrary((HMODULE)hLib);
           return 1;
      }

      TestModule();
      SRECTANGLE Rectangle; //--This line right here doesn't work, and I can't figure out why...--//
      
      FreeLibrary((HMODULE)hLib);
      
      getch();
      return 0;
}

[JesseGuarascia]

Hey there! I'm probably replaying a little late, but it's pretty simple. If you've ever used SDL, then you should know the gist of it, if not, lemme give you the low-down.

Using a .DLL file (I'm assuming that you made) is quite simple. All you have to do is go to your project's properties, and change the files that link to it, such as myLib.lib in the Input sub-section of the Linker section of your properties page. Add the include and library directories of the .DLL to your project or the directories if you can do that. Make sure the .DLL file is in your project folder. Finally, include the header file(s) in your .cpp file of the project using the .DLL and you should be good to go.

Just Google, "Adding Include and Library Directories for..." and then you're IDE. If its Visual Studio 2008/2010 and you want help, I should be able to. :D

[qpHalcy0n]

This method's a little more difficult.



EXPORT

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#ifdef EXPORT
     #define EXPORTSHIT __declspec(dllexport)         // Define EXPORT in your symbols only when actually exporting
#else
     #pragma comment(lib, "libname.lib")
     #define EXPORTSHIT __declspec(dllimport)
#endif
     

class shit
{
     public:
          shit();
          ~shit();
      
          void eat();

     private:
          int someshit;
};

extern "C"
void* EXPORT GetShit();       // This needs a C signature

implementation of the export (must be done elsewhere)

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void* EXPORT GetShit()
{
      return (void*)(new shit);
}

IMPORT

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HINSTANCE hdll = NULL;
shit* myShit = NULL;
typedef void* (*pvfunc)();
pvfunc CreateShit;


hdll = LoadLibrary("dllname.dll");		
CreateShit = (pvfunc)(GetProcAddress( hdll, "GetShit" ) );
myShit = (shit*)(CreateShit());

myShit->eat();

[MadPumpkin]

Thank you both! You both helped me a ton.

[GroundUpEngine]

Code: Select all

myShit.eat();

but seriously.. awesome technique!