small doubt about cin>>

[seshreddy]

Hi ,

We know that when we want to get input from console most frequently used one is cin and it waits infinitely for input.

But I want to use cin to get input without waiting more than specified time.That time may be some thing like after 5 sec.

Is it possible or not?

If so, can any one tell me the way to do it?


with regards...
seshu

[muthuis]

Nope! there is no time specific input readers.

[seshreddy]

how it will be if u use operator overloading?
but what happens when we want to infinitely for the input in some conditions of the application.

please think abnout it..


with regards...
seshu

[muthuis]

Sesh,
I am not really sure how overloading will be effective in this matter. A possible workaround could be running a separate thread with our regular cin to wait for the input. The parent process can do a Waitforsingleobject(handle,SPECIFIEDTIME);
If the input has been entered, return and come out. Otherwise kill the thread.
I am not really sure abt the overloading idea u r trying to say.

[mwilliamson]

Would a cout be read by cin? Maybe you test this:

#include <iostream>
#include <string>

using namespace std;

void cin_timeout( void* pVoid )
{
long timeout = pVoid;
Sleep( timeout );
cout << "timeout";
}

int main()
{
string s;
_beginthread( cin_timeout, 0, 5 );
cin >> s;
return 0;
}

[seshreddy]

Hi,

thank u all.

i tried to run the program using thread but i am getting error C2065: '_beginthread' : undeclared identifier

this is vc++ compiler and windows 2000.

this is the code that our friend has given abd which i too tried.

#include <iostream>
#include <string>
#include <windows.h>
#include <process.h>

using namespace std;

void cin_timeout( void* pVoid )
{
long timeout = (long)pVoid;
Sleep( timeout );
cout << "timeout";
}

int main()
{
string s;

_beginthread( cin_timeout, 0, 5 );
cin >> s;
return 0;
}

bye
seshu

[mwilliamson]

You need to compile with /MT, but I just tried and it doesn't work

[mahanare]

you may get rid of the error with proper settings. i feel.

If you try your code in a MFC supported console application will do the work.
start a console project but in the next step select "an application that supports MFC" this will start a console application with tmain()

then you can do the work.
this is may work as a solution for your error.
and don't forget to add #include<process.h>
it solves the problem of the compiler error

cheers
mahanare

[seshreddy]

hello



how can we do it with mfc support console application?

i tried to do but again same error is coming...

look at this..

bye
seshu