Velleman k8055: main.cpp erkennt .dll-Datei nicht!

Hallo!
Ich bin Anfänger im Programmieren und habe deshalb noch einige Fragen, 
die eventuell für Profis lachhaft erscheinen mögen. :D
Entschuldigen Sie das bitte.

Ich möchte Programme für das Velleman K8055 schreiben und benutze dazu 
C++ in der IDE DevC++ / DevCpp.

Anfangs würde ich gerne den von Velleman mitgelieferten Code "main.cpp" 
ausführen:

#include <cstdlib>
#include <windows.h>
#include <iostream>

typedef void(CALLBACK* t_func)(int );
typedef void(CALLBACK* t_func0)();
typedef int(CALLBACK* t_func1)();
typedef void(CALLBACK* t_func2)(int *, int *);
typedef void(CALLBACK* t_func3)(int , int );
typedef int(CALLBACK* t_func4)(int );
typedef bool(CALLBACK* t_func5)(int );

t_func4 OpenDevice;
t_func0 CloseDevice;
t_func0 Version_;
t_func4 ReadAnalogChannel;
t_func2 ReadAllAnalog;
t_func3 OutputAnalogChannel;
t_func3 OutputAllAnalog;
t_func ClearAnalogChannel;
t_func0 ClearAllAnalog;
t_func SetAnalogChannel;
t_func0 SetAllAnalog;
t_func WriteAllDigital;
t_func ClearDigitalChannel;
t_func0 ClearAllDigital;
t_func SetDigitalChannel;
t_func0 SetAllDigital;
t_func5 ReadDigitalChannel;
t_func1 ReadAllDigital;

HINSTANCE hDLL;
int foundDLL = 0;
int init();

using namespace std;

int main(int argc, char *argv[])
{
    int CardAddress;
    int dataOut1, dataOut2;
    int dataIn1, dataIn2;
    int h;


    h = init();
  if (!h)
  {
    cout << "DLL found" << endl;
    foundDLL = 1;
  }
  else
  {
    cout << "DLL not found " << endl;
  }
  if (foundDLL)
  {
    h = OpenDevice(0);
    if (h == 0)
    {
      cout << "Card 0 opened" << endl;
    }
    else
    {
      cout << "Card not found" << endl;
    }
  }
  if (foundDLL)
  {

        cout << "Press Enter to \"SetAllDigital\"" << endl;
        cin.get();
        SetAllDigital();
        cout << "Press Enter to \"OutputAllDigital 0x55\"" << endl;
        cin.get();
        WriteAllDigital(0x55);

        cout << "Press Enter to \"ReadAllDigital\"" << endl;
        cin.get();

        int i = ReadAllDigital();
        cout << i << endl;
        cout << "Press Enter to \"ReadDigitalChannel 1\"" << endl;
        cin.get();
        bool b = ReadDigitalChannel(1);
        cout << b << endl;
        cout << "Press Enter to \"ReadDigitalChannel 1\"" << endl;
        cin.get();
        b = ReadDigitalChannel(1);
        cout << b << endl;

        /*
        cout << "Press Enter to \"ClearAllDigital\"" << endl;
        cin.get();
        ClearAllDigital();

        cout << "Press Enter to \"OutputAllAnalog dataOut1, dataOut2\"" 
<< endl;
        cin.get();
        int h = 0;
        for (int i = 0; i<256; i++)
        {
            OutputAnalogChannel(1, i);
            h = ReadAnalogChannel(1);

        }

        int j;
         for (int i = 0; i<3; i++)
        {
            for (j = 0;j < 5;j++)
            OutputAnalogChannel(1, 0);
            for (j = 0;j < 5;j++)
            OutputAnalogChannel(1, 255);
        }

        dataOut1 =80;
        dataOut2 = 255;
        //OutputAllAnalog(dataOut1, dataOut2);
      */

        cout << "Press Enter to \"ReadAllAnalog dataIn1, dataIn2\"" << 
endl;
        cin.get();
        ReadAllAnalog(&dataIn1, &dataIn2);
            cout << "dataIn1 = " << dataIn1 << endl;
            cout << "dataIn2 = " << dataIn2 << endl;

        cout << "Press Enter to \"CloseDevices\" and to \"FreeLibrary\"" 
<< endl;
        cin.get();
        CloseDevice();

        FreeLibrary(hDLL);
    }

}

int init()
{
  hDLL = LoadLibrary("k8055d");
  if (hDLL != NULL)
  {
    OpenDevice = (t_func4) GetProcAddress(hDLL, "OpenDevice");
    if (!OpenDevice)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    CloseDevice = (t_func0) GetProcAddress(hDLL, "CloseDevice");
    if (!CloseDevice)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    ReadAnalogChannel = (t_func4) GetProcAddress(hDLL, 
"ReadAnalogChannel");
    if (!ReadAnalogChannel)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    ReadAllAnalog = (t_func2) GetProcAddress(hDLL, "ReadAllAnalog");
    if (!ReadAllAnalog)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    OutputAnalogChannel = (t_func3) GetProcAddress(hDLL, 
"OutputAnalogChannel");
    if (!OutputAnalogChannel)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    OutputAllAnalog = (t_func3) GetProcAddress(hDLL, "OutputAllAnalog");
    if (!OutputAllAnalog)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    ClearAnalogChannel = (t_func) GetProcAddress(hDLL, 
"ClearAnalogChannel");
    if (!ClearAnalogChannel)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    ClearAllAnalog = (t_func0) GetProcAddress(hDLL, "ClearAllAnalog");
    if (!ClearAllAnalog)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    SetAnalogChannel = (t_func) GetProcAddress(hDLL, 
"SetAnalogChannel");
    if (!SetAnalogChannel)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    SetAllAnalog = (t_func0) GetProcAddress(hDLL, "SetAllAnalog");
    if (!SetAllAnalog)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    WriteAllDigital = (t_func) GetProcAddress(hDLL, "WriteAllDigital");
    if (!WriteAllDigital)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    ClearDigitalChannel = (t_func) GetProcAddress(hDLL, 
"ClearDigitalChannel");
    if (!ClearDigitalChannel)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    ClearAllDigital = (t_func0) GetProcAddress(hDLL, "ClearAllDigital");
    if (!ClearAllDigital)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    SetDigitalChannel = (t_func) GetProcAddress(hDLL, 
"SetDigitalChannel");
    if (!SetDigitalChannel)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    SetAllDigital = (t_func0) GetProcAddress(hDLL, "SetAllDigital");
    if (!SetAllDigital)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    ReadDigitalChannel = (t_func5) GetProcAddress(hDLL, 
"ReadDigitalChannel");
    if (!ReadDigitalChannel)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    ReadAllDigital = (t_func1) GetProcAddress(hDLL, "ReadAllDigital");
    if (!ReadAllDigital)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    Version_ = (t_func0) GetProcAddress(hDLL, "Version");
    if (!Version_)
    {            // handle the error
      FreeLibrary(hDLL);
      return -2;
    }
    return 0;        // ok
  }
  return -1;          // error load DLL
}




Die Ausgabe ist immer DLL not found, obwohl die benötigte .dll-Datei 
korrekt im Projektordner liegt.
Woran liegt das und was kann ich tuen?


Vielen Dank im Vorraus.
LG Q