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optimizing a cin>> clone

Started by MrSandman666 Oct 14, 2000 at 11:51 PM 0 replies 250+ views

Original Post

Oct 14, 2000 at 11:51 PM

For my game I needed a function similar to cin (the C++ standart input handler). It should work the same accept for the fact, that it should return a pointer to a string and that ist should print the input echo in color. So I wrote this function:

    
char *GetInput()
{	
	char *Buffer;
	static char buf[100];
	COORD OldCursorPos;
	COORD StartPos;
	DWORD BufLength = 0;
	
	Buffer = buf;

	GetConsoleScreenBufferInfo(hOutput, &ScreenBuffer);
	OldCursorPos.X = ScreenBuffer.dwCursorPosition.X;
	OldCursorPos.Y = ScreenBuffer.dwCursorPosition.Y;

	StartPos.X = ScreenBuffer.dwCursorPosition.X;
	StartPos.Y = ScreenBuffer.dwCursorPosition.Y;

	ReadConsoleInput(hInput, &record, 1, &cRead);
	record.EventType = NULL;
	
	while (1)
	{
		while (record.EventType != KEY_EVENT)
			ReadConsoleInput(hInput, &record, 1, &cRead);
		
		GetConsoleScreenBufferInfo(hOutput, &ScreenBuffer);
		ReadConsoleInput(hInput, &record, 1, &cRead);

		if(isalnum(record.Event.KeyEvent.uChar.AsciiChar))
		{
			WriteString(CursorPos.X, CursorPos.Y, &record.Event.KeyEvent.uChar.AsciiChar);

			CursorPos.X = ScreenBuffer.dwCursorPosition.X + 1;
			CursorPos.Y = ScreenBuffer.dwCursorPosition.Y;
			SetConsoleCursorPosition(hOutput, CursorPos);
			BufLength++;
		}
		if (record.Event.KeyEvent.wVirtualKeyCode == VK_BACK)
		{
			if (CursorPos.X != OldCursorPos.X)
			{
				CursorPos.X = ScreenBuffer.dwCursorPosition.X - 1;
				CursorPos.Y = ScreenBuffer.dwCursorPosition.Y;
				SetConsoleCursorPosition(hOutput, CursorPos);
				BufLength--;
			}
			WriteString(CursorPos.X, CursorPos.Y, " ");
		}
		else if (record.Event.KeyEvent.wVirtualKeyCode == VK_SPACE)
		{
			WriteString(CursorPos.X, CursorPos.Y, " ");

			CursorPos.X = ScreenBuffer.dwCursorPosition.X + 1;
			CursorPos.Y = ScreenBuffer.dwCursorPosition.Y;
			SetConsoleCursorPosition(hOutput, CursorPos);
			
			if ((CursorPos.X - 1) == StartPos.X)
				StartPos.X++;
			else
				BufLength++;
		}
		else if (record.Event.KeyEvent.wVirtualKeyCode == VK_RETURN)
		{
			ReadConsoleOutputCharacter(hOutput, Buffer, BufLength, StartPos, &cRead);		
			break;
		}
		record.EventType = NULL;
	}
	

	return(Buffer);
	
}

It basically works. But sometimes characters are printed doubled or not at all (especially when I press the shift key). If you have any tips on solving this problem or other optimizations, pleeeeeeaaze reply. This function will be used a lot in my game and I want it to work properly. And I guess we can figure it out much faster when we all think about the problem than if I had to do this on my own. "Mr Sandman bring me a dream"

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