Re: How to check a HANDLE?

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#8606

From: Bob Gonder
Date: Thu, 07 Oct 2004 19:46

36 lines
1984 bytes

Bob Gonder wrote:

>Ed Mulroy [TeamB] wrote:
>
>>Does anyone know a way supplied by Windows to check if a HANDLE is 
>>valid, maybe something similar to IsValidLocale, IsBadReadPtr or 
>>IsWindow?
>
>How about GetFileType()

Just tried it with these cases, and it only passed with the actual
open file handle.

HANDLE		ff, h;
WIN32_FIND_DATA	fblk;

h=CreateFile("filedate.txt",GENERIC_READ+GENERIC_WRITE,FILE_SHARE_READ+FILE_SHARE_WRITE,NULL,
		OPEN_ALWAYS,FILE_FLAG_SEQUENTIAL_SCAN,NULL);
if( INVALID_HANDLE_VALUE != h )
{
	if( FILE_TYPE_UNKNOWN	!= GetFileType( h ) )
		printf( "passed\r\n" );
	if( FILE_TYPE_UNKNOWN	== GetFileType( stdin ) )
		printf( "failed\r\n" );

	ff = FindFirstFile( "filedate.txt", &fblk );
	if( INVALID_HANDLE_VALUE != ff )
	{
		if( FILE_TYPE_UNKNOWN	== GetFileType( ff ) )
			printf( "failed\r\n" );
		FindClose(ff);
	};
	CloseHandle(h);
	if( FILE_TYPE_UNKNOWN	== GetFileType( h ) )
		printf( "failed\r\n" );
};

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From: Bob Gonder <notbg@notmindspring.invalid>
Newsgroups: borland.public.cppbuilder.nativeapi
Subject: Re: How to check a HANDLE?
Date: Thu, 07 Oct 2004 12:46:47 -0700
Organization: MindSpring Enterprises, Inc.
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