C / C++ / MFC

A Astring;
Astring = "too long";

A& operator = (LPCSTR Astr)
{
	// reset the buffer
	::memset(str, 0, sizeof(str));

	if (!Astr)
		return *this;

	int len = ::strlen(Astr);
	if (len <= sizeof(str)) {		// too short or just right
		::strcpy(str, Astr);
	} else if (sizeof(str) < len) {	// too long
		// Q: how to handle the terminal nul???
		::strncpy(str, Astr, sizeof(str) - 1 );	// truncate
		str[1] = '\0';							// terminate
	}	
		
	return *this;
}

    dwStrBufferLen = /* character length of the <code>str</code> buffer */
    ::strncpy( str, Astr, dwStrBufferLen );
    str[ dwStrBufferLen - 1 ] = '\0';

rowdy_vc++ wrote:

any body plz explain..

COLORREF color, gray;
//...
BYTE avg = (GetRValue(color) + GetGValue(color) + GetBValue(color))/3;
gray = RGB(avg, avg, avg);

Rajkumar R wrote:

but averaging u meantion cannot differentiate even very distinct colours RED, GREEN, BLUE.

Rajkumar R wrote:

I personally don't believe averaging is a solution.

CPallini wrote:

distinguish a full red from a full green in a B/W movie? Does it matter to the Director?