Core Objects    

 

Adobe Portable Document Format (PDF) files are made of a number of objects. Objects may describe a page, a resource, a sequence of drawing operations an image or many other components as required by the document.

Every object has a unique Object ID and a characteristic Object Type. The root of the document hierarchy can be accessed using the Root property.

IDs are numbered from one upwards. The ID zero refers to the Empty Object which is an object required internally within ABCpdf. ID -1 refers to the document trailer.

You can use core information types to allow you to iterate through every object in your document. To get information about an object you need to use the GetInfo function. To change properties of an object you need to use the SetInfo function. All objects support the core properties listed below.

Additionally Specific Objects support other types of properties in addition to the core properties listed above.

Core Object Information Types

Type Name   GetInfo   SetInfo   Description
ID  

The Object ID of the Object.

For any object which exists the code theDoc.GetInfo(theID, "ID") will always be equal to theID. Object IDs are unique.
Type  

The Type of the Object.

This is a four character code that specifies the type of an object. Different object types have different properties.
Active  

Whether the object is active or not.

This property will normally be equal to one. If the object has been deleted or disabled then it will be equal to zero.
Value

The content of the object as it will be inserted into the final PDF document.

Note that the content of an object may be large and it may contain unusual characters.

See the Object Paths section of this document for further details.

/Label

Any object in a PDF dictionary may be referenced by name.

Most PDF objects are dictionaries. Dictionaries contain a number of entries, each tagged with a unique name starting with a slash character. You can access any named entry by simply passing the unique name to the GetInfo or SetInfo function. Named entries are case sensitive.

See the Object Paths section of this document for further details.

 

 

    

 

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