you can either, implement a communication protocoll with your C++ code or
just send it a kill signal
http://nodejs.org/api/child_process.html#child_process_child_kill_signal
you should also consider, that a child_process IS a process with all it's
footprint and, most important for you, a startup time. so you may be should
implement your pathfinding algorythm as a long runnning worker service or
use some threading binding
Am Montag, 17. Februar 2014 14:47:51 UTC+1 schrieb Rmx haha:
>
> I am making a game here. It will be free and I am choosing nodejs as it's
> server.
> I am not very new with Javascript. I've coded some easy client side
> Javascript for about 1.5 years but server side coding with javascript sure
> is very different from the client side.
> so I have to learn more about it.
>
> While making this game I realized that JavaScript performence isn't
> enough. Perhaps it's just this laptop of mine is 6 years old but I do think
> that it's still to slow.
> A pathfinding algorithm might take 100ms each and in this game The path
> finding algorithm require to be called around 50 times every second. so I
> think I will connect JavaScript with C++ program trough child_process. I
> first think exec will do the job but it doesn't have stdin so I use spawn.
>
>
> I made a sample for something easy.
> The code in C++ just infinites loop and keep asking input in integers and
> outputs double of it.
> (e.g. 50 outputs 100 )
>
> and write a proxy code between nodejs and C++
>
> var doubleIt = (function(){
>>
>> var Program = spawn('easy2.exe');
>>
>> var callOnOutput = function( output ){}
>>
>> Program.stdout.on('data', function( data ){
>>
>> callOnOutput( data.toString() );
>>
>> });
>>
>> Program.stderr.on('data', function( data ){
>>
>> console.log( "Error : " + data );
>>
>> throw new Error( data );
>>
>> });
>>
>> return function( input, callback ){
>>
>> callOnOutput = function( output ){
>>
>> callback( output );
>>
>> }
>>
>> Program.stdin.write( input + '\n' );
>>
>> }
>>
>> })();
>>
>>
> This code works outputs correctly
> doubleIt( 50, console.log );
> outputs 100 on console
>
> but the program won't exit after all the callback is called
> something is wrong
> can anyone help me ?
>
>
>
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