Possible channels of communication between Javascript on HTML page and a windows EXE?
Here's the thing.
A two-way communication (RPC-style) is needed between JavaScript on HTML pages provided by a web server online (with session-management and whatnot) and a windows EXE application running on the PC of the website visitor.
Both are parts of the same 'package' and should be able to communicate.
There is the use of a custom protocol for sure, but some browsers like Chrome & Safari sometimes have issues with custom protocol handling, so it is not reliable enough ...
Another possibility is to build a minimal web-server inside the EXE, so the communication would work with all browsers.
It is possible to develop an extension / plugin for each browsers separately, but it's a daunting task..
The usage of flash / jav开发者_StackOverflow中文版a seems not possible for this task because of sandboxing, but I'm not sure about this ??
Do you have any other ideas ?
You can use an embedded ActiveX (COM) object and communicate between both platforms. I've done it (and would not have believed it possible had I not). It's nasty but it works. In the project I used it on I had no choice (which is about the only reason to ever do this). I built the COM object in C#.net and exposed an interface to COM for use on the page. It goes something like this:
function doSomethingInteresting() {
// in your js:
var obj = document.getElementById('yourObjectId');
obj.MethodNameDefinedOnYourCOMObject("someParameterValue");
}
// and your HTML looks like this; note that you can even catch events thrown from the COM object in Js...
<body>
<form>
<object id="yourObjectId" height="0" width="0" classid="clsid:99999999-9999-9999-9999-999999999999" onerror="oError()" VIEWASTEXT></object>
<script for="yourObjectId" event="ThisIsTheJavaScriptEventHandlerMethod(parameterName)" language="javascript">
// event handling here for the COM object
function yourObjectId::ThisIsTheJavaScriptEventHandlerMethod(parameterName) {
// you can process the parameterName passed from the object here
}
</script>
</form>
</body>
Happy coding!
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