C / C++ / MFC

Am creating application and l need to fill a combo box list. However, l was able to do all and is working but whenever l filling the last combobox, l get an exception as below.

First-chance exception at 0x7789dba9 in Unical PTUME.exe: 0xC0000005: Access violation reading location 0x00000001.
Unhandled exception at 0x7789dba9 in Unical PTUME.exe: 0xC000041D: An unhandled exception was encountered during a user callback.

What does it mean and how can l correct it?

code snippet below:

case WM_CREATE:
DialogBox(((LPCREATESTRUCT)lParam)->hInstance, MAKEINTRESOURCE(IDD_CHOICEBOX),hWnd,choicedlg);//Dialog proc.
return 0;

INT_PTR CALLBACK choicedlg(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){
int i=0; static int firsttime=1; PWSTR input=NULL;
switch(message)
{
case WM_INITDIALOG:
//Add faculties to the combo list
for(i=0; i<=sizeof(Choice)/sizeof(Choice[0]); i++){
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_FACULTY,CB_ADDSTRING,0,(LPARAM)Choice[i]);
}
for(i=0; i<=sizeof(Course)/sizeof(Course[0]); i++){
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_SUBJECT1,CB_ADDSTRING,0,(LPARAM)Course[i]);
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_SUBJECT2,CB_ADDSTRING,0,(LPARAM)Course[i]);
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_SUBJECT3,CB_ADDSTRING,0,(LPARAM)Course[i]);
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_SUBJECT4,CB_ADDSTRING,0,(LPARAM)Course[i]);
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_SUBJECT5,CB_ADDSTRING,0,(LPARAM)Course[i]);
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_SUBJECT6,CB_ADDSTRING,0,(LPARAM)Course[i]);
}
for(i=0; i<=sizeof(Year)/sizeof(Year[0]); i++){
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_YEAR1,CB_ADDSTRING,0,(LPARAM)Year[i]);
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_YEAR2,CB_ADDSTRING,0,(LPARAM)Year[i]);
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_YEAR3,CB_ADDSTRING,0,(LPARAM)Year[i]);
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_YEAR4,CB_ADDSTRING,0,(LPARAM)Year[i]);
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_YEAR5,CB_ADDSTRING,0,(LPARAM)Year[i]);
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_YEAR6,CB_ADDSTRING,0,(LPARAM)Year[i]);
} //etc
However, if l add the code below, l always get error message as above.


for(i=0; i<=sizeof(Time)/sizeof(Time[0]); i++){
SendDlgItemMessage(hwnd,IDC_UNICALPTUME_TIME,CB_ADDSTRING,0,(LPARAM)Time[i]);
}// problem code

#include <stdlib.h>
#include <stdio.h>
#include <strings.h>

int main(int *op[]) {
char n;
int total;
int ct = 0, oper1 = 0, oper2 = 0, oper3 = 0, i = 0;
FILE *arq1;

arq1 = fopen("Maq1.log", "r"); //open file
while (!feof(arq1)) {
    n = fgetc(arq1);
    if (n == "\n") { //count lines
        ct++;
        }
    }
op = (int*) calloc(ct, sizeof(int)); //alloc memory
if(op==0) {
    printf("Não houve memoria alocada!\n");
    return 0;
    }
for(i=0;!feof(arq1);i++) {
    fscanf(",,,%d,", &op[ct]); //I think this is the error
    }
for(i=0;i<=ct;i++) { //do the count
    if(op[ct] == 1){
        oper1++;
        }
    if(op[ct] == 2){
        oper2++;
        }
    if(op[ct] == 3){
        oper3++;
        }
    }
total = oper1 + oper2 + oper3;
printf("Operacao 1: %d \n Operacao 2: %d \n Operacao 3: %d \n Total: %d \n", oper1, oper2, oper3, total); //and print!
fclose(arq1);
return 0;
}

Operacao 1: 0 
Operacao 2: 0 
Operacao 3: 0 
Total: 0