January 2007 - Posts

• A tip for improving perf with JScript...

  Most of you must be knowing this but still i find it useful to share... " If you are calling a dom method again and again in your website then it is a good idea to cache it to improve performance ." For example, let's say you are calling a method window.X1.X2.CallFoo() Read More... Posted Tuesday, January 23, 2007 6:28 AM by Jaiprakash | 0 Comments

• JScript exceptions not handled/thrown across frames if thrown from a expando method.

  Hope all of you are doing great! Today I am going to discuss sort of limitation of Jscript engine which I had hard time debugging. I hope through this post i can save you guys from running into same issue. Scenario - Let’s say Foo() is defined in one Read More... Posted Monday, January 22, 2007 11:17 AM by Jaiprakash | 0 Comments Filed under: JScript Exceptions IE frame

• Calling VariantClear on a OUT param can lead to security hole !!!

  There was a mail thread going on internally where a security hole was suspected due to VarianltClear() being called inside a method on a out param. Since i am new to COM world, I asked my fellow MSFTian Paul Dempsey that how can it be possible. Here is Read More... Posted Monday, January 15, 2007 7:30 PM by Jaiprakash | 1 Comments Filed under: COM VariantClear Security

• JScript supports SafeArrays of Variants only!!!

  Recently I investigated a bug in Jscript which was reported on Vista. The scenario was working perfectly fine on XP and win2k3 but regressed in Vista. Here is the repro code... var strSCID = "{305CA226-D286-468e-B848-2B2E8E697B74} 2"; var shell = new Read More... Posted Tuesday, January 09, 2007 6:00 PM by Jaiprakash | 1 Comments Filed under: Jscript VBarrays safearrays