Iterate through selected characters

Question

Hi guys and girls!
Has anybody a code snippet to show me how to iterate through the selected text (not the frame!, not the words, only the selected chars) and make any change on the characterAttributes (size, color, etc.)?
Deeper into it:
In the property "app.activeDocument.selection" usually the selected objects are stored as an array. Now when I select characters in a textframe (or TextPath, whatever) there is a [Textrange] in it.
I already tried some combinations like this snippet underneath but I still get errors, that selectedChars[i] is undefined.
FYI: I'm on Illustrator CS4, Mac OS X, Javascript
var selectedChars = app.activeDocument.selection.characters;
for (i = 0; i < selectedChars.length; i++ ){                           
     selectedChars[i].characterAttributes.fillColor = myNewCMYKColor;
I hope I have gathered all relevant information. If not, please do not kill me and just ask back
So has anybody a smart hint for me?
Thanks a lot in advance!

Answer 1

Here's a Change Size script that I found in my collection that somebody posted severat years ago. I'm sorry I don't remember who it was to give proper credit.
#target illustrator
// change size of paragraph text
//$.bp();
ChangeSize();
function ChangeSize()
    selectedItems = selection;
    // check to make sure something is selected.
    if (selectedItems.length == 0)
        alert("Nothing is selected");
        return;
    endIndex = selectedItems.length;
    for (index = 0; index < endIndex; index++)
        pageObject = selectedItems[index];
        pageItemType = pageObject.typename;
        if (pageItemType == "TextFrame")
            // get the paragraphs from the selection.
            theTextRange = pageObject.textRange;
            paraTextRange = theTextRange.paragraphs;           
            numParagraphs = paraTextRange.length;
            for (i = 0 ; i < numParagraphs ; i++)
                aParagraph = paraTextRange[i];
                charTextRange = aParagraph.characters;
                charCount = charTextRange.length;
                if (charCount > 1)
                    end = charCount;
                    fontSizeChanger = 14/end;
                    currentFontSize = 18;
                    for (j = 0 ; j < end; j++)
                        theChar = charTextRange[j];
                        theChar.size = currentFontSize;  
                        currentFontSize = currentFontSize - fontSizeChanger;
and here's the output.
You should be able to go from there.