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Date: Thu, 16 Feb 2006 02:13:55 +0100
To: "Michiel De Hoon" <mdehoon AT c2b2 DOT columbia DOT edu>, cygwin AT cygwin DOT com
From: Arend-Jan Westhoff <jpmcyafvmhsl AT spammotel DOT com>
Subject: Re: _kbhit
In-Reply-To: <6CA15ADD82E5724F88CB53D50E61C9AE9ECE5E@cgcmail.cgc.cpmc.co  lumbia.edu>
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At 18:58 2006-02-10 -0500, Michiel de Hoon wrote:
>> On Sun, Feb 05, 2006 at 01:17:33PM -0500, Michiel De Hoon wrote:
>> >For one of my software projects, I need the _kbhit function to check the
>> >console for keyboard input. While this function is present in msvcrt.dll,
>it
>> >is missing from cygwin1.dll, so I started writing this function myself
>(I'm
>> >hoping to contribute it to Cygwin if it works well).
>>
>> I really appreciate the sentiment of submitting code but _kbhit is not a
>> linux function (or <echo on>POSIX, POSIX, POSIX...</echo off>) so it
>> really isn't a candidate for inclusion in the Cygwin DLL.
>>=20
>> cgf
>>
>Even though _kbhit is not a POSIX function, I think a valid argument can be
>made to include it in Cygwin anyway.
>
>First, some Cygwin programs will need this function to be able to interact
>with the Windows OS. Second, as the Cygwin DLL is a replacement for msvcrt
>(and msvcrt.dll and cygwin1.dll cannot be used together), [snip]

I cannot confirm your assertion that msvcrt.dll and cygwin1.dll cannot be
used 
together. If I compile the attached (almost C) file that dynamically links to 
msvcrt.dll using Cygwin:
	gcc -o kbhit.exe kbhit.cpp
it compiles, links and works (on CMD and bash on CMD but not on rxvt; as 
stated elsewhere in this thread the Microsoft _kbhit is not very good).

HTH,

Arend-Jan Westhoff.
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#include <stdio.h>
#include <windows.h>

extern "C" {
	typedef int (*int_function_void_t)(void);

	HINSTANCE gimmeMSVCRT() {
		static HINSTANCE retval = LoadLibrary("MSVCRT.DLL");
		return retval;
	}

	int _kbhit(void) {
		static int_function_void_t f = (int_function_void_t) GetProcAddress(gimmeMSVCRT(), "_kbhit");
		return f();
	}
} // extern "C"

int main() {
	printf("Hit me!"); fflush(stdout);
	while(!_kbhit())
		;
	printf("\nOuch!!\n");
	return 0;
}


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