Monkeybread Software - DynaPDF Manual

DynaPDF Manual - Page 52

Content parsing & editing

Page 52 of 860

Content parsing & editing

DynaPDF contains a very powerful content parser that is already used since several years by

Optimize() and CheckConformance(). The very same parser can also be used to extract text, find

and replace text, delete arbitrary operators, convert text to outline, convert colors, or

downscaling and recompressing images, for example.

ParsePage() parses a page and creates a C object structure from it. This structure can be edited

with various functions like Find- / ReplaceText(), or by DeleteOperator(), for example. Note that

changes made on the C object structure do not take effect until the structure was written back

with WriteToPage().

Include files

The parser API is defined in the file parser_interface.h (C/C++) or CPDFContentParser.cls for

VB 6. Other programming languages do not need to include a separate file but the API is

encapsulated in the class CPDFContentParser(), or TPDFContentParser() in Delphi respectively

to make the usage easy as possible.

Abort

Syntax:

void psrAbort(

const IPSR* Ctx) // PDF instance pointer

The function can be used to abort parsing whenever needed. However, parsing can be aborted

only if ParsePage() was called in a separate thread. Note that it is not allowed to execute

different functions of the same PDF instance in different threads. Every thread requires either

its own PDF instance or function calls must be synchronized.

ChangeAltFont

Syntax:

LBOOL psrChangeAltFont(

const PPDF* IPDF, // PDF instance pointer

const IPSR* Ctx,

// Parser instance pointer

UI32 Handle)

// Font handle

The function changes the active alternate font that is used by ReplaceSelText() when the original

font is not available. The font handle must be a handle that was returned by SetFont(),

SetFontEx(), SetCIDFont(), or SetAltFont().

Return values:

If the function succeeds the return value is 1. If the function fails the return value is 0.