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POConverting an int64 value to a Number object in JavaScript
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  1. POConverting an int64 value to a Number object in JavaScript
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    copied!<p>I have a COM object which has a method that returns an unsigned int64 (VT_UI8) value. We have an HTML page which contains some JavaScript which can load the COM object and make the call to that method, to retrieve the value as such:</p> <pre><code>var foo = MyCOMObject.GetInt64Value(); </code></pre> <p>This value can easily be displayed to the user in a message dialog using:</p> <pre><code>alert(foo); </code></pre> <p>or displayed on the page by:</p> <pre><code>document.getElementById('displayToUser').innerHTML = foo; </code></pre> <p>However, we cannot use this value as a Number (e.g. if we try to multiply it by 2) without the page throwing "Number expected" errors. If we check "typeof(foo)" it returns "unknown".</p> <p>I've found a workaround for this by doing the following:</p> <pre><code>document.getElementById('displayToUser').innerHTML = foo; var bar = parseInt(document.getElementById('displayToUser').innerHTML); alert(bar*2); </code></pre> <p>What I need to know is how to make that process more efficient. Specifically, is there a way to cast foo to a String explicitly, rather than having to set some document element's innerHTML to foo and then retrieve it from that. I wouldn't mind calling something like:</p> <pre><code>alert(parseInt((string)foo) * 2); </code></pre> <p>Even better would be if there is a way to directly convert the int64 to a Number, without going through the String conversion, but I hold out less hope for that.</p>
 

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