Flash MX 2004.
layer.frames
Read-only property; an array of Frame objects (see Frame object.
The following example sets the variable frameArray to the array of Frame objects for the frames in the current document:
var frameArray = fl.getDocumentDOM().getTimeline().layers[0].frames;To determine if a frame is a keyframe, check whether the frame.startFrame property matches the array index, as shown in the following example:
var frameArray = fl.getDocumentDOM().getTimeline().layers[0].frames;
var n = frameArray.length;
for (i=0; i<n; i++) {
if (i==frameArray[i].startFrame) {
alert("Keyframe at: " + i);
}
}