The PDF objects here refer to document-level objects a PDF contains, which are different from page-level objects associated with each PDF page, such as text, image and path. There are eight types of document-level object that can be created, modified and deleted using Right PDF SDK APIs: Boolean object, numerical object, string object, name object, array object, dictionary object, stream object, and null object. Here are some common APIs listed in Table 3.15. For a complete list of APIs, please refer to ZSObj.h.

Table 3.15

  API Name Description
1 ZSAtom_GetString Get the string associated with the specified atom.
2 ZSAtom_FromString Get the atom for the specified string.
3 ZSObj_Equal Determine whether two PDF objects are equal.
4 ZSObj_Compare Compare two PDF objects.
5 ZSObj_GetType Get the type of an object.
6 ZSObj_GetBoolean Get Boolean value from a PDF object.
7 ZSObj_GetDateTime Get the date value from a PDF object.
8 ZSArray_NumElements Get a count of elements in an array.
9 ZSArray_GetInteger Get an integer element in an array.
10 ZSDict_HasKey Determine whether a specific key exists in a dictionary or not.
11 ZSStream_GetDataa Get stream data.

 

This is an example of using document-level APIs to set facing pages side by side in two columns.

Example: Set PageLayout to TwoColumnRight in a catalog dictionary.

ZSObj catalogObj;

ZSResult ret = ZSDoc_GetCatalog(doc, &catalogObj);

if (ret != ZS_OK)

{

return ret;

}

ZSAtom atomkey;

ZSAtom atomValue;

ZSAtom_FromString(“PageLayout”, &atomKey);

ZSAtom_FromString(“TwoColumnRight”, &atomValue);

 

ret = ZSDict_SetName(catalogObj, atomKey, atomValue, ZS_FALSE);

 

相关资源