Hi Russ,

what's your problem exactly, I don't think its really the NULL value of PropIdent?

So I guess, your problem is, dpi is not set.

If I change one of these ***DefaultParams(), I use this function:

function SetPropVal (prop, propval, params)

    {

          var i = GetPropIndex(params, prop);

          if (i < 0)

            return false ;

          if (typeof(propval) == 'number')

            params[i].propVal.ival  = propval;

          if (typeof(propval) == 'string')

            params[i].propVal.sval  = propval;

          return true;

    }

First parameter is the constant value, second the value to set and third the ***DefaultParams.

Hope this helps

Markus

Hi Russ,

I use typeof most to check if an variable is initialized or not.It's part of the javascript syntax http://de.selfhtml.org/javascript/sprache/operatoren.htm#typeof.

i.e.

var myvariable;

//.... do more code

if (typeof(myvariable)=='undefined')

     myvariable = "Hello world";

but you can also use it to check the basic type of this variable. Basic types are boolean, string, number, function, object and undefined.

I like the documentation and community of http://www.selfhtml.org. Where othere languages like html, perl, php etc, are documented as well.

Unfortunately this website isn't available in Englisch. But perhaps Google translate can help.

Bye

Markus

Hi Russ,

there's a big difference between these two lines of codes...

if (typeof(myvariable)=='undefined')

typeof only checks if a variable is initialized and it's part of the javascript syntax.

If you declare

var myvariable;

it's not initialized; it's undefined

if you don't check this and use it like myvariable.dosomething(), you'll get a runtime error.

if (!myvariable.ObjectValid)

ObjectValid() is an ES-function, which could be called to all FM-Objects (FO_* in FDK). It returns false if the id of this object is 0 or true if it's not 0. Or it returns false if this object doesn't exist anymore. It's the same als you call F_ApiGetObjectValid() in your FDK clients.

So your variable is initialized with an FM object but it is not valid.

BTW:don't miss the parenthesis when calling ObjectValid

myvariable.ObjectValid() it's a function not a property

Perhaps it's getting clear with a sample:

var doc ;

alert(typeof(doc)) ; //Message: undefined

doc = app.ActiveDoc;

alert(typeof(doc)); //Message: object

//It's allways initialized, because ES delivers always an instanziated Doc object, even if there's no document opened.

alert(doc.ObjectValid()) ; //returns false if there's no active doc and true if there's an valid active doc.

So if you are not sure at the point you use variable "doc", check this with typeof to avoid runtime errors. And then check if your doc object is valid.

var doc;

//some code, where doc should be initialized (external function)

if (typeof(doc)=='undefined')

{

     //do some errorhandlings, perhaps there is a problem in your code somewhere else

}

if (doc.ObjectValid()==false)

{

     //your code what should be done, if there is no valid doc at this point

}

Hope I could make it clear

Markus