I have sap system with gateway configured. can we build native windows 8 application just by directly using the service url or is there any other middle ware required.
A) A native WinJS application in JavaScript, using frameworks like AngularJS and Apache Cordova or PhoneGap. For the SMP, this is a REST API application, further info see here:
Option A) is easier to adapt to iOS or Android or any other OS supported by PhoneGap / Cordova, if that requirement comes up later. I did it myself, it works, but it´s a lot more manual implementation effort for a serious business application than it is with option B). I did not have the chance yet to try B) by myself.
If you don´t have SAP Mobile Platform you still have basically the same options.
In case A) you can handle the access to the OData service using a JavaScript framework like ODataJS or another one from this list: http://www.odata.org/libraries/ > JavaScript.
In case B) you develop the C# manually and use a library or a template such as the OData Client Code Generator to access the OData service, see http://www.odata.org/libraries > .NET
No need for an additional middleware, unless you have loads of mobile clients and want to use SAP Mobile Platform.
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