Re: WaitForSingleObject on Console not working???

From:
"James Brown" <not@home.net>
Newsgroups:
microsoft.public.vc.language
Date:
Thu, 13 Jul 2006 10:05:09 +0100
Message-ID:
<mo2dnaaMCa5rkSvZnZ2dnUVZ8qidnZ2d@pipex.net>
<kimso.zhao@gmail.com> wrote in message
news:1152781048.880965.297700@h48g2000cwc.googlegroups.com...

How can I know if there is input or not from keyboard in console
application? I want to flush buffer to screen every second.

In Unix, select( ) with stdin and timeout can work well( return timeout
every second ), but in Windows, stdin is NOTSOCK, hence select won't
work.

In Windows, WaitForSingleObject( stdinHandle, 1000 ) will return
"WAIT_OBJECT_0" when waiting for input.

How come the following always goes into "WAIT_OBJECT_0"?

What could I do? Is there any way to use select( ) in Windows with
stdin?

Thanks!

#include <windows.h>
#include <stdio.h>

int main()
{
 printf("->");
 static HANDLE stdinHandle;
 // Get the IO handles
 // getc(stdin);
 stdinHandle = GetStdHandle(STD_INPUT_HANDLE);
 DWORD rc = WaitForSingleObject(stdinHandle, 1000);

 if( rc == WAIT_TIMEOUT )
 {
   printf("Timeout...");
 }
 else if( rc == WAIT_ABANDONED )
 {
   printf("WAIT_ABANDONED");
 }
 else if( rc == WAIT_OBJECT_0 ) // Always go into this branch, why???
 {
   printf("WAIT_OBJECT_0");
 }
 else if( rc == WAIT_FAILED )
 {
   printf("Error:%d.", GetLastError());
 }

 return 0;
}


stdin/stdout/stderr are simple FILE* streams, there is not really any
concept of a console here.

You can use the low-level console API if you want direct access to the
console - i.e. PeekConsoleInput

--
James Brown
Microsoft MVP - Windows SDK
www.catch22.net
Free Win32 Tutorials and Sourcecode

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