Problem with mfc?

Hy,

i hope someone could help me ;)

i have written an programm to controll an fpga card with an existing libary. The example programm was in c and i have to use c++ and the mfc for my project. I managed it to get rid of all error messages and the programm starts without any warnings but if i want to acess the dfpga board i get an Messagebox with the Error

unhandled exception in kartentestprog.exe: 0xC0000005: Access Violation.

Code:

---

void CKartentestprogDlg::OnStart()
{
        // TODO: Add your control notification handler code here
        Sleep(1000); 
        fpga[0] = 1;  // <-- here comes the error
        fpga[1] = 0;
}

---

this is the inilization of the board wich works perfekt and all returns are ok.

Code:

---

int CKartentestprogDlg::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
        if (CDialog::OnCreate(lpCreateStruct) == -1)
                return -1;
       
        //connect the fpga and load the .hap file
        microenable  *board;
        fpga_design  *design;
        volatile unsigned long *fpga;
        int          rCode;
        int          PlxClk  = 40;
        int          FpgaClk = 100;
        char          DesignName[128] = "kartentester.hap";

        // -------------------------------------------------------------------
        // initialization of hardware
        // -------------------------------------------------------------------
        board = initialize_microenable();
        if (board==NULL) {
                //intf ("hardware initialization failed (code %d) : %s\n",
                //  Me_GetErrCode(NULL),Me_GetErrMsg(NULL));
                MessageBox( "Hardwareinizialisation failed", "Error", MB_OK );
                return -1;
        }
        //printf ("hardware initialization ok\n");
        MessageBox( "Hardware inizialisation is ok", "No Error", MB_OK );


        // -------------------------------------------------------------------
        // load a design
        // -------------------------------------------------------------------
        design  = load_design(board,DesignName);  // available in standard path
        if (design == NULL) {
                //printf ("load design %s failed (code %d) : %s\n",
                //            DesignName,Me_GetErrCode(board),Me_GetErrMsg(board));
                MessageBox( "Load of the Design failed", "Error", MB_OK );
                return -1;
        }
        //printf ("load design ok\n");
        MessageBox( "Load of the Design is ok", "No Error", MB_OK );


        // -------------------------------------------------------------------
        // set clocks
        // -------------------------------------------------------------------
        rCode  = set_plx_clk (board,design, PlxClk);
        if (rCode) {
                //intf ("setting plx clock to %d Mhz failed:  error code %d)\n",PlxClk,rCode);
                MessageBox( "Clock Settings failed", "Error", MB_OK );
                return -1;
        }

        rCode  = set_fpga_clk (board,design, FpgaClk);
        if (rCode) {
                //printf ("setting fpga clock to %d Mhz failed: error code %d)\n",FpgaClk,rCode);
                MessageBox( "Clock Settings failed", "Error", MB_OK );
                return -1;
        }
        //printf ("clock setting ok (plx: %d Mhz, Fpga: %d Mhz)\n",PlxClk,FpgaClk);
        MessageBox( "Clock Settings are ok", "No Error", MB_OK );


        // -------------------------------------------------------------------
        // configure FPGA
        // -------------------------------------------------------------------
        rCode  = configure_fpga(board,design);
        if (rCode) {
                //printf ("configuration design %s failed: error code %d)\n",DesignName,rCode);
                MessageBox( "configuration design failed", "Error", MB_OK );
                return -1;
        }
        //printf ("configuration design %s ok\n",DesignName);
        MessageBox( "configuration design is ok", "No Error", MB_OK );


        // -------------------------------------------------------------------
        // get the access pointer
        // -------------------------------------------------------------------
        fpga  = (volatile unsigned long *) GetAccessPointer (board);
        if (fpga == NULL) {
                //printf ("memory map failed: error code %d (%s))\n",Me_GetErrCode(board),Me_GetErrMsg(board));
                MessageBox( "memory map failed", "Error", MB_OK );
                return -1;
        }
        MessageBox( "Memory Map ok", "No Error", MB_OK );


       
        return 0;
}

---

SO i hope someone could tell my what this error is all about and where it might come from.

Thanx for all answers

Greets Joerg

i thought it must have to do something with the declaration too, but i had tken the code most out of the example i hab for c.

in nearly an beginner with c++

Edit:

Thank you ;) i marked the redefinition of the variable as an comment and now it works real fine ;)