How to modify a unicode string.

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C++

I have a function

void ModifyString2 (WCHAR *szString)
{
    // Declare a sample wide character string.
    int nLen = wcslen (szString);
    wcscat_s(szString, MAX_STRING_SIZE, L"-Modified" );
}

I am calling this function from main function.

void main ()
{
    WCHAR szString [MAX_NAME_LENGTH] ;
    wcscpy_s(szString, MAX_NAME_LENGTH, L"This is Some String");
    printf ("Before Call String  Value=[%s]", szString);

    ModifyString2(szString);

    printf ("Before Call String  Value=[%s]", szString);
}

When I debug this program, and exit from main i get an error

Run-Time Check Failure #2 - Stack around the variable 'szString' was corrupted.

what i am doing wrong ?

What I have tried:

instead of allocating szString on stack, i tried it with heap,

like

void main ()
{
    WCHAR * szString = new WCHAR [MAX_NAME_LENGTH] ;
    wcscpy_s(szString, MAX_NAME_LENGTH, L"This is Some String");
    printf ("Before Call String  Value=[%s]", szString);

    ModifyString2(szString);
    
    printf ("Before Call String  Value=[%s]", szString);
    delete szString;
    return 0;

}

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

Not sure, what i am doing wrong, I am using Visual Studio 2010 ultimate, on a windows box.

please Help.


-praveen.