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    <p>This is apparently a known issue and it doesn't seems like Adobe is going to fix it anytime soon.</p> <p>I found a <a href="http://mihai.bazon.net/blog/externalinterface-is-unreliable">detailled explaination</a> of this problem and basicly the issue seems to be that Flash doesn't handle the <code>\</code> and the <code>&amp;</code> properly which can lead to javascript error or data corruption during the transfer from Flash to javascript.</p> <p>What Flash attempts to do when you transfer data from Flash to JS is to execute the following thing :</p> <pre><code>try { __flash__toXML(yourJavascriptFunction("[DATA]")) ; } catch (e) { "&lt;undefined/&gt;"; } </code></pre> <p>The problem is that it puts your data raw and it doesn't escape the backslash at all. If your string contains only <code>\</code> and you want to call <code>console.log</code> on it, it will try to do the following thing :</p> <pre><code>try { __flash__toXML(console.log("\")) ; } catch (e) { "&lt;undefined/&gt;"; } </code></pre> <p>As you can see this is invalid javascript. It will throws an error in your Javascript console and it will never call <code>console.log</code>.</p> <p>The solution is to either ducktape Flash behavior or do some nasty hack to get around it.</p> <p>To ducktape Flash buggyness you can escape the blackslash before you transfer them. This solution will work for now, but when Flash will fix it (most probably not in a near future, if you consider that this bug is known for more than 4 years), it will break your application.</p> <p>The other possibility is to url encode the character that Flash doesn't handle well (<code>\</code>, <code>"</code>, <code>&amp;</code>) and to decode them on the other side.</p> <p><strong>Flash :</strong></p> <pre><code>data = data.split("%").join("%25") .split("\\").join("%5c") .split("\"").join("%22") .split("&amp;").join("%26"); </code></pre> <p><strong>Javascript :</strong></p> <pre><code>data = data.replace(/%22/g, "\"") .replace(/%5c/g, "\\") .replace(/%26/g, "&amp;") .replace(/%25/g, "%"); </code></pre> <p>It's ugly, but it works.</p>
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    1. COThe "ugly" hack didn't work, but the escape below did. Still the explanation is extensive enough to bring something positive.
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