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POConverting from v8::Arguments to C++ Types
 

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  1. POConverting from v8::Arguments to C++ Types
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    <p>I'm playing with creating Node.js modules in C++, but I'm stumped on the v8::Arguments class. Lets say I have a Javascript class for sending emails, which has a method with this signature:</p> <pre><code>Mailer::sendEmail(Array recipients, String sender, String message); </code></pre> <p>Which would be called like this:</p> <pre><code>mailer.sendEmail(["joe@gmail.com", "sally@gmail.com"], "fred@gmail.com", "Hi there"); </code></pre> <p>Now in C++ land, I have a class function with this signature:</p> <pre><code>SendEmail(const v8::Arguments&amp; args) </code></pre> <p>Which is backing my Mailer::sendEmail method in Javascript land. The SendEmail function will create a new instance of my Emailer class, which itself has a class function with this signature:</p> <pre><code>send(std::list&lt;std::string&gt; recipients, std::string from, std::string message) </code></pre> <p>And this is where I'm lost. I don't know how to take the values from <em>args</em>, and convert them into regular C++ types, so I can pass the values to my <em>send</em> function. As I understand it, the 3 values passed to Mailer::sendEmail will be available in <em>args[0]</em>, <em>args[1]</em>, and <em>args[2]</em>. I even understand I can do some type checking like <code>if (!args[0]-&gt;IsArray())</code>, but actually converting <em>args[0]</em> to <code>std::list&lt;std::string&gt;</code> is what I don't know how to do.</p> <p><strong>Edit:</strong> I found a hackish way of doing this, but I still think V8 has some built in methods to handle this in a cleaner way.</p> <pre><code>static Handle&lt;Value&gt; SendEmail(const Arguments&amp; args) { HandleScope scope; list&lt;string&gt; values; Local&lt;Object&gt; obj = args[0]-&gt;ToObject(); Local&lt;Array&gt; props = obj-&gt;GetPropertyNames(); // Iterate through args[0], adding each element to our list for(unsigned int i = 0; i &lt; props-&gt;Length(); i++) { String::AsciiValue val(obj-&gt;Get(i)-&gt;ToString()); values.push_front(string(*val)); } // Display the values in the list for debugging purposes for (list&lt;string&gt;::iterator it = values.begin(); it != values.end(); it++) { cout &lt;&lt; *it &lt;&lt; endl; } return scope.Close(args.This()); } </code></pre>
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    1. CO@Thomas That answer is *painfully* vague. Additionally there are undoubtedly correct ways of converting the args to c++ types in V8.
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    2. CO@mellowsoon that's putting it kindly
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