Running programs in the background

[timetraveldude]

does anyone know how to run a console program in the background. This would be like the DNS or DHCP service that runs on a server waiting for a request.

thanks

 

[chroot]

It might help to tell us what platform you're talking about.

- Warren

 

[timetraveldude]

It might help to tell us what platform you're talking about.

- Warren

Windows 2000

 

[dduardo]

Good luck. Microsoft's console isn't the most robust thing in the world.

Unix or Linux:

ctrl-z the program in the console. It will display a number along with the name of the program. Then you can do "bg [number]" or "fg [number]" depending if you want the program in the background or foreground

 

[timetraveldude]

Good luck. Microsoft's console isn't the most robust thing in the world.

Unix or Linux:

ctrl-z the program in the console. It will display a number along with the name of the program. Then you can do "bg [number]" or "fg [number]" depending if you want the program in the background or foreground

What I want to do is have a program wait for a keyboard event using the kbhit() function. The problem I am having is that the program will only register a keyboard event if the window the program started from is clicked upon. What I need to do is have the program detect a keyboard press reagardless of whether the windows running the program is in focus.

I am running this through the DOS console on a windows 2000 machine.

 

[master_coda]

What I want to do is have a program wait for a keyboard event using the kbhit() function. The problem I am having is that the program will only register a keyboard event if the window the program started from is clicked upon. What I need to do is have the program detect a keyboard press reagardless of whether the windows running the program is in focus.

I am running this through the DOS console on a windows 2000 machine.

The only way I know of to do that is with a LowLevelKeyboardProc. You would need to use the Windows API, though.

 

[timetraveldude]

What about just running an application independently of the console window. For example, under unix or linux you can type 'my_prog &' with the '&' sign. If you close the window the program was launched from the program will still run. Is there a way to do this under windows.

thanks for all the help.

 

[master_coda]

What about just running an application independently of the console window. For example, under unix or linux you can type 'my_prog &' with the '&' sign. If you close the window the program was launched from the program will still run. Is there a way to do this under windows.

thanks for all the help.

If you want an application to run in the background, you can run it as a service. That can be rather difficult to do, since writing a service involves some rather arcane API calls (at least it used to...maybe things have changed). But that is the standard way in Windows to have programs run in the background.

I believe there are tools that will let you run an ordinary console or window app as a service. That's probably a lot easier.

 

[dduardo]

Here is what I suggest. Get cygwin from here: http://www.cygwin.com/
Make sure to install g++. write a program using the ncurses library. Here is some sample code to take ctrl-c, ctrl-d, etc as characters and you can process them as you like:

#include <ncurses.h>

int main( void )
{
        int c ;

        initscr() ; // Intialize Screen
        raw() ; // Disable Line Buffering
        keypad(stdscr, TRUE) ; //Read Function Keys and Arrows
        noecho() ; // Disable printing input to screen without permission

        printw("Type any character\n") ; // Equivalent to printf
        c = getch() ; // Wait for character input
        printw("%c was pressed",c) ; // Equivalent to printf

        refresh() ; // Print information from stdscr to visible window
        getch() ; // Wait for character input
        endwin() ; // Destroy Screen
        return 0 ;
}

When you compile this piece of code with g++ make sure to do it this way:

g++ -lncurses <filename.cpp>

 

[master_coda]

Here is what I suggest. Get cygwin from here: http://www.cygwin.com/
Make sure to install g++. write a program using the ncurses library. Here is some sample code to take ctrl-c, ctrl-d, etc as characters and you can process them as you like:

When you compile this piece of code with g++ make sure to do it this way:

g++ -lncurses <filename.cpp>

Will that work when the terminal doesn't have focus?

 

[dduardo]

Of course the terminal window has to be in focus. How else do you differentiate input between multiple programs.

 

[master_coda]

Of course the terminal window has to be in focus. How else do you differentiate input between multiple programs

timetraveldude asked if there was a way to catch all input regardless of whether or not his program was in focus.

 

[dduardo]

Here is workaround hack:

Setup a key-event with your desktop. This is going to differ across desktop environments. When a specific key is pressed, have it run a script that checks to see if your programming is running. If it is, bring the program to the foreground.

 

[Dissident Dan]

How to make a service:
http://www.codeguru.com/Csharp/.NET/cpp_managed/windowsservices/article.php/c4877/
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I'm pretty sure that there is some simple way to get input that wasn't intended for your window, but I forget what it is.