From: sos AT prospect DOT com DOT ru (Sergey Okhapkin)
Subject: RE: "GetNumberOfConsoleInputEvents" never 0?
1 Mar 1997 05:43:01 -0800
Approved: cygnus DOT gnu-win32 AT cygnus DOT com
Distribution: cygnus
Message-ID: <01BC2637.88D8D620.cygnus.gnu-win32@sos>
Original-To: "'Peter Dalgaard BSA'" <p DOT dalgaard AT kubism DOT ku DOT dk>
Original-Cc: "gnu-win32 AT cygnus DOT com" <gnu-win32 AT cygnus DOT com>,
        "'Geoffrey Noer'"
	 <noer AT cygnus DOT com>
Encoding: 79 TEXT
Original-Sender: owner-gnu-win32 AT cygnus DOT com

Peter Dalgaard BSA wrote:
> Does this have anything to do with the character composition bug?
> (I.e. dead keys not working - tilde/backquote gone on my keyboard)

You mean entering "national" characters with ascii code > 128? This is a 
bug of Windows 95. There are two methods to read keyboard in Win32 API - 
ReadFile() (ReadConsole()) and ReadConsoleInput(). The first (two) calls 
allows entering such characters, but "filters" non-ascii keys (arrows, 
F-keys, etc.). ReadConsoleInput() allows to read functional keys but 
keyboard layout switcher doesn't work on Win95 with this call! There is no 
problems with NT. I used the following work-around in my programs on Win95:

/*
 * int ReadKey (void) - reads console input (including function
 *			 			keys and national characters).
 * Return value:
 *		ASCII character (OEM codepage) in low byte
 *		Virtual Keycode of function key in high byte if low byte == 0.
 * BUGS:
 *		This function does not filter keyboard layout switching
 *		hot keys.
 *
 * Original design by Boris Usievich.
 * Custom implementation by Sergey Okhapkin
 */

#include <windows.h>

int ReadKey()
{
  INPUT_RECORD  irBuffer;
  DWORD n;

  int ch;

  HANDLE hIn = GetStdHandle(STD_INPUT_HANDLE);
  HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);

  SetConsoleMode(hIn, ENABLE_PROCESSED_INPUT);

  do {
    PeekConsoleInput(hIn, &irBuffer, 1, &n);
    if (n==0) {
		Sleep(100);
		continue;
    }

    if (irBuffer.EventType == KEY_EVENT &&
        irBuffer.Event.KeyEvent.bKeyDown) {
         if (irBuffer.Event.KeyEvent.uChar.AsciiChar != '\0') {
           ReadConsole(hIn, &ch, 1, &n, NULL);
           return ch & 0xff;
         } else {
         	ReadConsoleInput(hIn, &irBuffer, 1, &n);
	        return irBuffer.Event.KeyEvent.wVirtualKeyCode << 8;
        };
    } else
      ReadConsoleInput(hIn, &irBuffer, 1, &n);
  } while (TRUE);
}

#include <stdio.h>

void main()
{
	int ch;

	for(;;) {
		if ((ch = ReadKey()) & 0xff)
			printf("%c", ch);
		else
			printf("VK_%d", (ch >> 8) & 0xff);
	}
}

--
Sergey Okhapkin
Moscow, Russia
Looking for a job

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