SearchAndReplaceTextInContent
Extraction
Description
Performs TRUE content-stream text replacement: rewrites the Tj/TJ/'/" show-text operators in place so the original text is gone from the stream and cannot be recovered. This is fundamentally different from SearchAndReplaceText, which only overlays a white rectangle plus new text on top of the original glyphs (the original bytes remain).
Locates hits via SearchText, maps each hit rectangle to its covering show-text instruction via the content-stream analyser (FindInstructionsInRect), rewrites the operand string via ReplaceTextRun, and writes the layer back.
Caveats: TJ array kerning is collapsed to an unkerned string; the replacement text must be encodable in the existing font's encoding or glyphs render as .notdef. The method does not embed new fonts.
Syntax
Delphi
Function TPDFlib.SearchAndReplaceTextInContent(Const Query, Replacement: WideString; Options: TPDFlibSearchOptions; Const PageRange: WideString): Integer;Parameters
| Query | The text to find |
|---|---|
| Replacement | The replacement text (must be encodable in the existing font) |
| Options | soCaseSensitive / soWholeWord, same as SearchText |
| PageRange | Pages to search (empty = all) |
Return values
| >= 0 | Number of hits whose underlying show-text instruction was rewritten |
|---|