how would i do it on windows

rmknox · 06-13-2012, 08:21 PM

I have a c program i run at the command line.

I would like to compile it on a windows system to run on windows so I can share it with one of my kids - one of those windows user people.

I put up a prompt and then wait till either the user answers or it times out.

I do that using a POSIX feature - a call to "select" .

I understand that POSIX features are not typically supported on windows.

Can someone familiar with c and windows - command line - not graphical - tell me how to wait either for input on stdin or till n seconds pass, using a feature that windows supports ?

Thanks

Dick

rstewart · 06-14-2012, 09:32 AM

Windows (Visual Studio) supports select, I use it all the time. Porting code from Linux over to Windows is fairly easy. Porting from Windows to Linux can be tougher if the program is coded using Windows-isms (Functions that are specific to the Windows platform and may or may not have corresponding Linux functionality). If you stick to the Linux APIs, your should be okay when porting the code over to Windows.

Also, you could get the cygwin IDE instead of using Visual Studio.

Multiple ways to do what you are asking.

rmknox · 06-14-2012, 07:14 PM

rstewart
i just tried it and did not succeed - I downloaded the free 30 day version of visual

heres what i have in linux
#include <unistd.h>
...
#include <sys/time.h>
...
return TEMP_FAILURE_RETRY (select (FD_SETSIZE,
&set, NULL, NULL,
&timeout));
...
it complained about the three lines above + and others defined in the h files

on linux it is a c program - i note that in visual everything is c++
maybe i need different header definitions?

any wisdom you can share is appreciated

Dick

ntubski · 06-15-2012, 08:44 AM

Windows defines some POSIX functions, but not all and they are often in different header files. It does have select, but I'm pretty sure it's only for sockets; you can't use it to test stdin.

You may be able to use WaitForSingleObject, although there is a comment on that page:

Quote:

Originally Posted by Medinoc

Make sure to disable the ENABLE_LINE_INPUT console mode before waiting on a console input buffer object.

Regardless of the mode, console input buffer objects are signaled as soon as a character is typed, while the reading functions will block until the line is finished, voiding the purpose of a dedicated, time-limited wait function.

johnsfine · 06-15-2012, 09:33 AM

Anyone else trying to help in this thread may wish to know that a big part of the relevant info is in the OP's related thread. See
http://www.linuxquestions.org/questi...7/#post4704019