Thread: Which function ??

Which function is faster for clearing screen in win32 console program, function 1 or 2?

Function 1:

Code:

void clrscr ()
{
  system ("cls");
}

Function 2:

Code:

void clrscr()
{
   COORD coordScreen = { 0, 0 };
   DWORD cCharsWritten;
   CONSOLE_SCREEN_BUFFER_INFO csbi;
   DWORD dwConSize;
   HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);

   GetConsoleScreenBufferInfo(hConsole, &csbi);
   dwConSize = csbi.dwSize.X * csbi.dwSize.Y;
   FillConsoleOutputCharacter(hConsole, TEXT(' '), dwConSize, coordScreen, &cCharsWritten);
   GetConsoleScreenBufferInfo(hConsole, &csbi);
   FillConsoleOutputAttribute(hConsole, csbi.wAttributes, dwConSize, coordScreen, &cCharsWritten);
   SetConsoleCursorPosition(hConsole, coordScreen);
}

2
end of story..... system() is bad!

Function 2.
The system function is SLOOOOW, avoid it when possible.

-Prelude

I've only used the first function and the results were creepy. So damn slow I've never seen. Now I'm using the second function and is beautiful.

A smaller number of lines of code doesn't always mean it is faster than more lines.

I'm aware of that.


Thanks guys.