C / C++ / MFC

This may be due to a corruption of the heap, which indicates a bug in MFCTest.exe or any of the DLLs it has loaded.

This may also be due to the user pressing F12 while MFCTest.exe has focus.

The output window may have more diagnostic information.
HEAP[MFCTest.exe]: Invalid Address specified to RtlValidateHeap( 003C0000, 003C8E70 )
Windows has triggered a breakpoint in MFCTest.exe.

This may be due to a corruption of the heap, which indicates a bug in MFCTest.exe or any of the DLLs it has loaded.

This may also be due to the user pressing F12 while MFCTest.exe has focus.

The output window may have more diagnostic information.
Object dump complete.

#include "stdio.h"
#include <string.h>
#include "stdlib.h"
#define _CRT_SECURE_NO_WARNINGS

int main()
{
    FILE *p = NULL;
    size_t len = 0;
    unsigned int convertedChars = 0;

    int ret;
    
    wchar_t toTranscode[] = L"ناعسالاخخ";
    //wchar_t toTranscode[] = L"hello";
    unsigned int wLent = wcslen((const wchar_t*)toTranscode);
    //------------------------------------------------------
    // a UTF-8 character can have maximum 6 bytes
    //------------------------------------------------------
    int maxCharLen = 6*wLent;
    wchar_t* pWideCharBuf;
    char* pToFill;
    unsigned int i;

    //--------------------------------------------------------------
    // alloc memory for variables.
    //--------------------------------------------------------------
    pWideCharBuf = (wchar_t*)malloc(wLent+1);
    pToFill = (char*)malloc(maxCharLen+1);

    for (i = 0; i < wLent; ++i)
    pWideCharBuf[i] = toTranscode[i];
    pWideCharBuf[wLent] = 0x00;

    memset (pToFill, 0, maxCharLen+1);
  // convert the string

    //ret = wcstombs(pToFill, pWideCharBuf, maxCharLen);

    ret = wcstombs_s(&convertedChars, pToFill, maxCharLen, pWideCharBuf, maxCharLen);
    //ret = wcstombs_s(&convertedChars, pToFill, maxCharLen, pWideCharBuf, _TRUNCATE);
    printf("ret is %d\n", ret);

    printf("the ascii char is  = %s\n", pToFill);
    printf("to test\n");


    p = fopen("hello.txt", "w");
    if (p== NULL) {
       printf("Error in opening a file..");
    }
   len = strlen(pToFill);
   fwrite(pToFill, len, 1, p);
   fclose(p);
   printf("\nWritten Successfuly in the file.\n");

    // pToFill contains the string

    //-------------------------------------------------------
    // clean-up
    //-------------------------------------------------------
    //lete [] pWideCharBuf ;

    // don't forget to
    //delete [] pToFill ;
    return 0;
}