Is the UID of a document's first layer always the same?

Question

I am trying to come up with a reliable way of identifying the default layer in a document; i.e. the layer present when the document is created. Experiment suggests that the layer's UID is always the same for every document:

169 for CS3 on PC

170 for CS3 on Mac

182 for CS4, both platforms

Does anyone know if this correct?

Markus Freitag · Accepted Answer

Do not make any assumption about UIDs in a document or other databases.

Think about a document based on a template document. The template document could be created with an older version of InDesign.

What do you suggest if you work with a document on PC which was created on Mac?

Markus

D¡rk Becker · Answer

Markus is on the point, do not make such assumptions.

With no document ( targeting application defaults ) create a bunch of swatches, character styles, text variables.

These will be copied into the next new document, probably before the layer is created.

Revisit your layer ID - it will be different.

In other words, only depend on IID_IACTIVELAYER or IID_ILAYERLIST.

Dirk

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