{"id":1103,"date":"2014-10-11T21:00:58","date_gmt":"2014-10-11T18:00:58","guid":{"rendered":"http:\/\/www.webcodegeeks.com\/?p=1103"},"modified":"2014-10-11T17:54:17","modified_gmt":"2014-10-11T14:54:17","slug":"integrating-node-js-with-a-c-dll","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/javascript\/node-js\/integrating-node-js-with-a-c-dll\/","title":{"rendered":"Integrating Node.js with a C# dll"},"content":{"rendered":"<p><!-- Inline Ads in Posts --><\/p>\n<p>Recently I had to integrate a Node.js based server application with a C# DLL. Our software (a web-app) offers the possibility to execute payments over a POS terminal. This latter one is controllable through a dedicated DLL which exposes interfaces like <code>ExecutePayment(operation, amount)<\/code> and so on. As I mentioned, there is the Node.js server that somehow exposes the functionality of the POS (and some more) as a REST api. (The choice for using Node.js had specific reasons which I wouldn&#8217;t want to outline right now).<\/p>\n<p>When you start with such an undertaking, then there are different possibilities. One is to use <strong>Edge.js<\/strong> which allows you to embed, reference and invoke .Net CLR objects from within your Node.js based applications. Something like this:<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">var hello = require('edge').func({\r\n    assemblyFile: 'My.Edge.Samples.dll',\r\n    typeName: 'Samples.FooBar.MyType',\r\n    methodName: 'MyMethod' \/\/ Func&lt;object,Task&lt;object&gt;&gt;\r\n}});\r\n\r\nhello('Node.js', function (error, result) { ... });<\/pre>\n<p>Edge is a very interesting project and has a lot of potential. In fact, I just tried it quickly with a simple DLL and it worked right away. However, when using it from my Node app within <a href=\"https:\/\/github.com\/rogerwang\/node-webkit\">node-webkit<\/a> it didn&#8217;t work. I&#8217;m not yet sure whether it was related to node-webkit or the POS DLL itself (because it might be COM exposed etc..). However, if you need simple integrations this might work well for you.<\/p>\n<h2>Process invocation<\/h2>\n<p>A second option that came to my mind is to design the DLL as a self-contained process and to invoke it using Node.js&#8217;s <a href=\"http:\/\/nodejs.org\/api\/process.html\">process api<\/a>. Turns out this is quite simple. Just prepare your C# application to read it&#8217;s invocation arguments s.t. you can do something like..<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">IntegrationConsole.exe ExecutePayment 1 100<\/pre>\n<p>..to &#8220;ExecutePayment&#8221; with operation number 1 and an amount of 1\u20ac. The C# console application needs to communicate it&#8217;s return values to the STDOUT (you may use JSON for creating a more structured information exchange protocol format).<br \/>\nOnce you have this, you can simply execute the process from Node.js and read the according STDOUT:<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">var process = require('child_process');\r\n...\r\nprocess.exec(execCmd,\r\n    function (error, stdout, stderr) {\r\n        var result = stdout;\r\n\r\n        ...\r\n\r\n        writeToResponse(stdout);\r\n    });<\/pre>\n<p><code>execCmd<\/code> is holds the instructions required to launch the EXE with the required invocation arguments.<\/p>\n<p>In this approach you execute the process, it does its job, returns the response and terminates. If for some reason however, you need to keep the process running for having a longer, kind of more interactive communication between the two components, you can communicate through the STDIN\/STDOUT of the process.<br \/>\nYour C# console application starts and listens on the STDIN..<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">static void Main(string&#x5B;] args)\r\n{\r\n    ...\r\n    string line;\r\n    do\r\n    {\r\n        line = Console.ReadLine();\r\n        try\r\n        {\r\n            \/\/ do something meaningful with the input\r\n            \/\/ write to STDOUT to respond to the caller\r\n        }\r\n        catch (Exception e)\r\n        {\r\n            Console.WriteLine(e.Message);\r\n        }\r\n    } while (line != null);\r\n}<\/pre>\n<p>On the Node.js side you do not <code>exec<\/code> your process, but instead you <code>spawn<\/code> a child process.<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">var spawn = require('child_process').spawn;\r\n...\r\nvar posProc = spawn('IntegrationConsole.exe', &#x5B;'ExecutePayment', 1, 100]);<\/pre>\n<p>For getting the responses, you simply register on the STDOUT of the process..<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">posProc.stdout.once('data', function (data) {\r\n        \/\/ write it back on the response object\r\n        writeToResponse(data);\r\n    });<\/pre>\n<p>..and you may also want to listen for when the process dies to eventually perform some cleanup.<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">posProc.on('exit', function (code) {\r\n        ...\r\n    });<\/pre>\n<p>Writing to the STDIN of the process is simple as well:<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">posProc.stdin.setEncoding = 'utf-8';\r\nposProc.stdin.write('...');<\/pre>\n<p>In this way you have a more interactive, &#8220;stateful communication&#8221;, where you send a command to the EXE which responds (STDOUT) and based on the response you again react and send some other command (STDIN).<\/p>\n<h2>Embedding this in the Request\/Response pattern<\/h2>\n<p>To expose everything as a REST api (on Node), you need to pay some attention on the registration of the event handlers on STDOUT. Suppose you do something like<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">app.post('\/someEndpoint', function(req, res){\r\n    posProc = spawn('IntegrationConsole.exe', &#x5B;'ExecutePayment', 1, 100]);\r\n    ...\r\n    posProc.stdout.on('data', function(data){\r\n        \/\/ return the result of this execution\r\n        \/\/ on the response\r\n    });\r\n}),\r\n\r\napp.post('\/someOtherEndpoint', function(req, res){\r\n    ...\r\n    posProc.stdout.on('data', function(data){\r\n        \/\/ return the result of this execution\r\n        \/\/ on the response\r\n    });\r\n\r\n    \/\/ write to the stdin of the before created child process\r\n    posProc.stdin.setEncoding = 'utf-8';\r\n    posProc.stdin.write('...');\r\n});<\/pre>\n<p>I excluded proper edge case handling like what happens if your process died before etc.. but the key point here is that <strong>you cannot register your events<\/strong> by using <code>on(..)<\/code>, as otherwise you&#8217;ll end up having multiple <code>data<\/code> event handlers on the <code>stdout<\/code>. So you can either register and de-register the event by using the <code>removeListener('event name', callback)<\/code> syntax or use the more handy <code>once<\/code> registration mechanism (as I did already in my samples at the beginning of the article):<\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">posProc.stdout.once('data', function (data) {\r\n            \/\/ write it back on the response object\r\n            writeToResponse(data);\r\n        });<\/pre>\n<div class=\"attribution\">\n<table>\n<tbody>\n<tr>\n<td><span class=\"reference\">Reference: <\/span><\/td>\n<td><a href=\"http:\/\/juristr.com\/blog\/2014\/03\/integrating-node-with-csharp\/\">Integrating Node.js with a C# dll<\/a> from our <a href=\"http:\/\/www.webcodegeeks.com\/wcg\/\">WCG partner<\/a> Juri Strumpflohner at the <a href=\"http:\/\/juristr.com\/blog\/\">Juri Strumpflohner&#8217;s TechBlog<\/a> blog.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Recently I had to integrate a Node.js based server application with a C# DLL. Our software (a web-app) offers the possibility to execute payments over a POS terminal. This latter one is controllable through a dedicated DLL which exposes interfaces like ExecutePayment(operation, amount) and so on. As I mentioned, there is the Node.js server that &hellip;<\/p>\n","protected":false},"author":5,"featured_media":908,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[34],"class_list":["post-1103","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-node-js","tag-ajax"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Integrating Node.js with a C# dll - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Recently I had to integrate a Node.js based server application with a C# DLL. 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