main.cpp

#include <windows.h>
#include <stdio.h>
#include "TestInterface.h"

// Simplified version of the logging function.
void logOneLine (const char *clr, const char *msg) {
    static FILE *log    = 0;
    log         = fopen("TestDLL.log", log ? "at" : "wt");
    fprintf     (log, "%s: %s\n", clr, msg);
    fclose      (log);
}
// Macro logging to ease reading the code.
#define Log     logOneLine(__func__, buff)

int main (void) {
    char    buff[255];
    memset              (buff, 0, 255*sizeof(char));
    Log;

    HMODULE hDll        = LoadLibrary(L"TestLib.dll");
    while (1) {
        if (hDll) {
            // You might want to replace mangled names below with the right ones after compiling on your system.
            Instanciator        instanciator            = (Instanciator)    GetProcAddress(hDll,    "_Z11Instanciatebi");
            Destructor          destructor              = (Destructor)      GetProcAddress(hDll,    "_Z7DestroyP13TestInterface");
            if (!instanciator || !destructor) {
                sprintf         (buff, "Unable to retrieve factory function pointers.");
                Log;
                break;
            }

            int numinstances    = 0;
            printf              ("\nEnter number of iterations:");
            if (scanf("%d", &numinstances)!=1)
                break;

            sprintf             (buff, "Number of iterations: %d.", numinstances);
            Log;
            if (numinstances<1 || numinstances > 40)
                break;

            TestInterface       **ptrs                  = new TestInterface*[numinstances];
            if (!ptrs)
                break;
            memset              (ptrs, 0, sizeof(TestInterface*)*numinstances);

            for (int i=0; i<numinstances; ++i) {
                sprintf         (buff, "Iteration #%d...", i);
                Log;
                bool    bb;
                int     ii;
                ptrs[i]        = instanciator((i % 2)==0, i);
                if (!ptrs[i])
                    break;
                if (ptrs[i]->get(bb, ii)) {
                    sprintf(buff, "Got bb=%s, ii=%d.", bb ? "true" : "false", ii);
                    Log;
                }
            }
            for (int i=0; i<numinstances; ++i) {
                destructor      (ptrs[i]);
                ptrs[i]         = 0;
            }
            delete[]            ptrs;
        }
        break;
    }
    if (hDll) {
        FreeLibrary         (hDll);
        hDll                = 0;
    }
    return 0;
}