strcpy_s & strncpy_s with char pointers

[Draznar]

I have been tasked fixing deprecations and need some help with some rather newbie problems. Listed below are two examples of some warnings that I need to address.

I am seeking some examples on the proper use of strcpy_s & strncpy_s or a link to some "How To:". One thing that I am trying to figure out is, if I am copying into a char *, how do I determine the 2nd parameter, "numberOfElements : Size of the destination string". At first I was doing sizeof(someCharPointer) but then I realized that would not give me what I want. Please forgive the newbie questions, I don't know if this was the correct forum to ask. Thank you for any assistance.


strcpy example
bool RegKey::EnumerateValues(LPTSTR pszValueName, LPBYTE lpValue, DWORD& dwValueSize, DWORD& dwValueType, const DWORD dwIndex)
{
TCHAR tmpName[2048] = {'\0'};

DWORD dwTmpNameSize = sizeof(tmpName);

LONG lRetValue = RegEnumValue(hTheKey_, dwIndex, tmpName, &dwTmpNameSize, NULL, &dwValueType, lpValue, &dwValueSize);
if(lRetValue == ERROR_NO_MORE_ITEMS)
{
_tcscpy(pszValueName, tmpName);
iLastErrorCode_ = ERROR_NO_MORE_ITEMS;
return false;
}

_tcscpy(pszValueName, tmpName); //To be changed to _tcscpy_s()

return true;
}

strncpy example
bool RegKey::GetValue(LPCTSTR pszValueName, LPTSTR pszValue, DWORD& dwValueLength)
{
TCHAR* tmpBuffer = new TCHAR[dwValueLength + 1];
memset(tmpBuffer, 0, dwValueLength * sizeof(TCHAR));

_tcsncpy(pszValue, tmpBuffer, dwValueLength); //To Be changed to _tcsncpy_s()
delete [] tmpBuffer;
tmpBuffer = NULL;

iLastErrorCode_ = ERROR_SUCCESS;
return true;
}