API WM_CHAR

    static char str[256];
	int len;
    
    case WM_CHAR:
		len = strlen(str);
		str[len] = (TCHAR)wParam;
		str[len + 1] = 0;
		InvalidateRect(hWnd, NULL, FALSE);
        break;
	case WM_PAINT:
		hdc = BeginPaint(hWnd, &ps);
		// TODO: 여기에 그리기 코드를 추가합니다.
		TextOutA(hdc, 10, 10, str, strlen(str));
		break;