Reading PDF Font Properties with PDFium Component in Delphi
Inspect the fonts inside a PDF from Delphi with PDFium Component: read a glyph's family name, base name, weight, italic angle, and whether the face is embedded
Software Development Blog
PDFium Component
PDFium Component tutorials for rendering, viewing, and processing PDFs in Delphi
Auditing PDF Security Risks With PDFium in Delphi
Before you trust a PDF, enumerate its risk surface. See how PDFium reads document JavaScript, launch actions and signature permissions for an audit in Delphi
Build a PDF Viewer in Delphi with PDFium Component
Assemble a PDF viewer in Delphi with PDFium Component: connect TPdf to TPdfView, load and render a document, then add paging, zoom, and fit navigation
Combine Scanned Images into One PDF with PDFium Component in Delphi
Merge a folder of scanned images into one PDF with PDFium Component in Delphi: create the document, add one page per image, scale each image, and save
Render PDF Pages to JPEG Images in Delphi with PDFium Component
Render PDF pages as JPEG images in Delphi with PDFium Component: convert DPI to pixel dimensions, draw each page to a bitmap, and encode it with TJPEGImage
Creating PDFs from Scratch with PDFium Component in Delphi
Create a PDF from scratch in Delphi with PDFium Component using CreateDocument, AddPage, AddText, and CreatePath while handling coordinates and embedded fonts
Text Markup Annotations with PDFium QuadPoints in Delphi
Delphi highlight annotations need QuadPoints in Z order, and FPDFAnnot_SetAttachmentPoints returns false on a new PDFium annotation until Append adds a slot
Deploying the PDFium DLL in Delphi: Fixing Load Failures
Diagnose pdfium.dll load failures in Delphi: fix the 32/64-bit ERROR_BAD_EXE_FORMAT 193, spot a stale DLL, and load the PDFium Component safely across threads
Detecting and Extracting XFA Forms in Delphi with PDFium
Detect XFA forms in Delphi and extract the template, datasets and config packets as raw XML with PDFium Component — static packet reading needs no V8 runtime
XFDF Export and Import in Delphi with PDFium Component
A German locale turns 70.5 into 70,5 and breaks hand-built XFDF. PDFium Component ExportXFDF and ImportXFDF keep the period for Delphi fields and annotations
Extracting Images from PDFs with PDFium Component in Delphi
Extract embedded PDF images in Delphi with PDFium Component: read BitmapCount, fetch each Bitmap[], handle silent open failures, and save JPEG or BMP output
Extracting Text from PDF Files with PDFium Component in Delphi
Extract PDF text in Delphi with PDFium Component using raw Character[] glyph access, structured ReadablePageContent, and a guard for silent Active failures
Hardening a PDFium Component Binding: ABI and Memory Safety
Harden a Pascal binding over PDFium in Delphi: cdecl callbacks, size_t width on FPC Win64, exceptions at the C boundary, handle ownership and managed records
Inspect PDF Signatures and PAdES Levels in Delphi
Read PDF signatures with the PDFium Component in Delphi and Lazarus: inspect SubFilter, ByteRange and CMS, then detect PAdES B-B to B-LTA baseline levels
Long-Term PDF Signatures in Delphi: PAdES B-LT and B-LTA
Add long-term PAdES signatures in Delphi with the PDFium Component: RFC 3161 timestamps, DSS validation stores and DocTimeStamps for B-T, B-LT and B-LTA
Merging Multiple PDF Files into One Document with PDFium Component
Merged PDF in reverse order or missing pages? PDFium Component ImportPages positions, range strings, MergeFiles error reports and fillable form fields in Delphi
N-up Imposition and Page Reordering With PDFium
Lay several PDF pages onto one sheet, reorder pages in place, or pull a subset. See PDFium's imposition and page-move APIs in Delphi and the handle they return
Parsing PDF Dictionaries Safely in Delphi: Name Tokens
Why substring key lookups corrupt PDF dictionary parsing in Delphi: whole name token matching per ISO 32000-1 and resource caps against hostile PDFs
Build an Accessible PDF Reader in Delphi with PDFium
Make a Delphi PDF viewer work with screen readers: tagged reading order extraction, word-level TTS highlighting, and honest fallbacks for untagged PDFs
Graft AcroForm Fields Across PDFs in Delphi with PDFiumPas
How PDFiumPas grafts AcroForm fields between PDF documents in Delphi: GraftPdfAcroForm, widget page remapping, graft map transactions and fail closed limits
Adaptive PDF Image Resampling in Delphi with PDFiumPas
PDFiumPas picks box, bilinear, bicubic or Lanczos kernels when downsampling PDF images in Delphi, with alpha-aware math and a strict working-memory budget
Why Some AES-256 R6 PDFs Reject the Correct Password
Why an off-by-one in the AES-256 R6 hash round counter makes some encrypted PDFs reject the right password, and how to catch it with a cross-implementation test
Annotation Appearance Round Trips in Delphi with PDFium
Round-trip PDF annotations in Delphi with PDFium Component without adding empty rollover or down appearances, and keep the /AP dictionary PDF/A safe on write
Delphi PDF Annotation Review with PDFium Component
Build a PDF annotation review panel in Delphi: index markup by page, survive appearance-stream vetoes, and recolor or delete annotations without ghosts
Atomic Batch PDF Form Filling in Delphi with PDFium
A Delphi import writing PDF form fields one by one can stop halfway. PDFium Component commits typed field values across pages as one all-or-nothing batch
Axial and Radial PDF Gradients in Delphi with PDFium
Axial and radial PDF gradients in Delphi with PDFium Component: integer ShadingType, multi-stop stitching, TargetRect clips and why a bare sh paints nothing
Background PDF Rendering in Delphi with Cancellable Futures
Move long PDF renders off the UI thread with cancellable futures in Delphi, while managing worker lifetime, cancellation, completion, and safe UI updates
Banded PDF Rendering in Delphi: the Negative Y Offset
How the PDFium Delphi component renders huge pages in horizontal bands, why a negative Y offset preserves full-page geometry, and how PNG and TIFF stream out
Cancellable Progressive PDF Rendering in Delphi (PDFium)
A slow page render should not freeze the UI or run to the end. See how PDFium's progressive rendering becomes cancellable via IFSDK_PAUSE in Delphi
PDF Checkbox Flattening: Field Value vs Widget in Delphi
Checkboxes flatten unchecked when /V is read from the widget annotation, because /V belongs to the parent field dictionary per ISO 32000-1. Fix it in Delphi
Embed CID Type 2 Fonts in PDF from Delphi
PDFium Component writes glyph-level text with a CID Type 2 font in Delphi, generating CID-to-GID and ToUnicode maps so shaped text stays extractable
CMS signedAttrs DER SET OF Sorting in PDFium Component
PDFium Component sorts CMS signedAttrs as a DER SET OF per X.690 11.6, since a same-origin sign-and-verify test cannot catch what re-encoding validators reject
Content-Aware Table Continuation Across PDF Pages in Delphi
Word exports end tables at the margin, so a page-edge test never links them. PDFium Component checks body text and caption rows to chain PDF tables in Delphi
Create PDF Layers (OCG and OCMD) in Delphi with PDFium
PDFium exposes no call to put page content on a layer. PDFium Component adds new OCGs, OCMD visibility rules and /OC-gated Form XObjects to a PDF from Delphi
Loading the PDFium Native Library on Any Target
The ordered search chain the PDFium component uses to find its native library, and why one capital letter in an FPC target macro can break the lookup on Linux
Delphi vs FPC: 4 Hidden PDF Code Pitfalls in PDFium Builds
Four hidden gaps between Delphi and FPC/Lazarus hit the same PDFium code: record temporary lifetime, range checks, E2010 TBytes casts, and AnsiString byte loss
Never Walk DER Length Octets Backwards: PDFium Component
PDFium Component locates a nested CMS TLV from its content length, because DER length octets cannot be walked backwards once a length leaves the short form
Why PDF Form Field Values Revert: Direct Fields in Delphi
Why a PDF form field write in Delphi succeeds yet reads back the old value: direct AcroForm dictionaries, duplicate widgets and one indirect owner per field
PDFium Component DocMDP: Widget /P Is Not Ownership
Why a signature widget /P back-link must not count as ownership in DocMDP P=3 checks, how PDFium Component models ownership, and how to fail closed in Delphi
PDFium Component Dynamic XFA: Page Count Is a Delta
How dynamic XFA repagination affects page counts, input hit areas and text selection in a Delphi PDF viewer, and how PDFium Component keeps them in step
PDF Undo, Redo and Crash Recovery in Delphi
PDFium Component adds document-level undo, redo and crash recovery to PDF editing in Delphi using verified snapshots and compact bidirectional deltas
PDFium Byte Range Loading for Embedded PDFs in Delphi
How PDFium Component loads an embedded PDF straight from a TBytes byte range in Delphi, with overflow safe bounds checks and borrowed buffer lifetime rules
PDFium Emoji and CJK Text: Beyond WideChar in Delphi
FPDFText_GetUnicode returns a full 32-bit code point but WideChar holds 16 bits. How to extract emoji and rare CJK ideographs correctly with PDFium in Delphi
You Cannot Silently Patch an Encrypted PDF in Delphi
The PDFium Component in Delphi refuses to patch an encrypted PDF with plaintext markers or PAdES signatures, per ISO 32000-1 7.5.6 on incremental updates
eIDAS Trusted Lists and Qualified PDF Signatures
How the PDFium component authenticates a European trusted list before parsing it, and records qualified status separately from ordinary chain trust
Exact PDF Version Saves in Delphi: PDFiumPas Conformance
A %PDF-1.4 header can hide PDF 1.7 content. PDFium Component SaveAs aligns catalog /Version, walks the xref chain and checks Adobe extension levels in Delphi
WaitForIdle Deadlock in Delphi PDFium Async Rendering
How WaitForIdle and padSynchronize replies deadlock the Delphi main thread in PDFium Component, plus queue capacity, shutdown order and TPdf ownership limits
Linearize PDFs for Fast Web View with PDFium in Delphi
A linearized PDF lets a viewer show page one early. How PDFium Component TPdf.SaveAsLinearized groups objects and writes Annex F hint tables in Delphi
FillChar on a Function Result Leaks Strings in Object Pascal
FillChar on a Delphi or FPC function result zeroes a managed record without releasing its strings, leaking memory each time the routine runs in a loop
Filled-Rectangle Table Borders as Rulings in PDFium Delphi
PDFium Component turns thin filled rectangles from Word and browser exports into table rulings, snaps coordinates within 4pt and reads form XObjects in Delphi
PDF Form Field Navigation in Delphi (PDFium Component)
Why filled PDF forms look blank in Acrobat and how to fix it: FormFill setup, keyboard field traversal, and GenerateFormAppearances in Delphi viewers
PDFium Component: PDF Form Tab Order and /Tabs in Delphi
PDFium Component for Delphi follows the page /Tabs policy in form navigation: row, column and structure order, page rotation, reading direction and fallbacks
FPDF_FORMFILLINFO Version 2 in Delphi: Follow the DLL ABI
XFA-enabled pdfium.v8.dll rejects FPDF_FORMFILLINFO version 1 even for plain AcroForm PDFs, so PDFium Component always passes version 2 and gates XFA hooks
FPC for-Loop Bounds: Why Cancel May Not Stop Printing
A three-layer print loop in a Delphi and FPC PDF viewer keeps rendering after Cancel is clicked because Free Pascal locks the for loop bound at entry
Why PDF Encryption Keys Need /dev/urandom on FPC
Why RTL Random without Randomize repeats PDF encryption keys, salts and GCM nonces across FPC processes, how PDFiumPas uses /dev/urandom, and how to test it
FPC Codepage Traps Break PDF/A XMP Metadata in Delphi
A non-ASCII PDF title can become invalid UTF-8 inside the XMP packet on Free Pascal. Here is the string codepage rule behind it and the SetCodePage technique
PDF 2.0 AES-GCM Encryption in Delphi: ISO/TS 32003
A flipped bit in AES-CBC PDF ciphertext still decrypts; ISO/TS 32003 AESV4-GCM rejects it. PDFium Component R7 encryption and PDF MAC checks in Delphi
ISO/TS 32002 ECDSA and EdDSA Policy Checks in PDFium Delphi
A P-256 key signing SHA-512 verifies yet breaks ISO/TS 32002. How the PDFium Component checks ECDSA curves, digest pairing and Ed25519/Ed448 encoding in Delphi
PDF Viewer for Lazarus and Free Pascal with PDFium
Port a Delphi PDF viewer to Lazarus and Free Pascal: string encoding traps, runtime form construction, PDFium binary loading, and TTS beyond Windows
A libcurl Timestamp Backend for PDFium VCL on FPC
PDFium VCL posts RFC 3161 timestamp queries through libcurl on non-Windows targets, with eight bound symbols and two settings that decide whether it hangs
PDFium Library Config: Why Brotli Can Swap Skia for AGG
Why Brotli or per-document isolates in FPDF_LIBRARY_CONFIG can swap Skia for AGG, why absent backends abort the process, and how PDFium Component checks first
Low-Vision PDF Color Filters in Delphi with PDFium
Add dark mode and low-vision reading modes to a Delphi PDF viewer: post-render inversion, two kinds of grayscale, and overlay colors that stay visible
Signing PAdES with a macOS Keychain Identity in Delphi
PDFium VCL binds Security framework symbols at runtime so a macOS Keychain signing backend compiles everywhere and names every symbol it could not resolve
Reading and Writing PDF Marked Content in Delphi
Marked content is the BDC and EMC pair behind tagged PDF. How PDFium Component reads, writes and shares marks, typed property lists and MCIDs in Delphi
PDFium Matrix Prepend vs Append in Delphi: Pivot Rotation
How the PDF row-vector convention makes Multiply append and PreMultiply prepend in Delphi, why PreTranslate needs the linear part, and how pivot helpers compose
PDFium Thread Safety: Why Per-Document Locks Fail in Delphi
PDFium is unsafe across the whole module, not per document. See how PDFium Component for Delphi serializes batch validation and renders pages in parallel safely
PDF Name Tree and Number Tree Editing in Delphi
How PDFium Component rebuilds ISO 32000 name trees and number trees in Delphi: balanced nodes, correct /Limits, stable root identity and verified saves
Why Some PDF Object Streams Decode to Garbage in Delphi
Learn why FlateDecode alone leaves PDF object streams differenced instead of raw, and how PDFiumPas applies PNG and TIFF Predictor reconstruction in Delphi
Add a Searchable Text Layer to Scanned PDFs in Delphi
PDFium Component adds an invisible OCR text layer to scanned PDFs from Delphi, mapping word quads through device-to-page transforms without touching images
OpenSSL AIA and CRL Retrieval for PDF Signatures in Delphi
PDFium VCL fetches missing intermediate certificates via AIA and CRLs via distribution points on its OpenSSL backend, under hard budgets that never grant trust
Verifying PDF Signatures with OpenSSL in PDFium VCL
PDFium VCL plugs an OpenSSL CMS verifier into PAdES validation, and three OpenSSL behaviors will silently produce a wrong verdict if you do not handle them
Operator-Level PDF Redaction in Delphi with PDFiumPas
How PDFiumPas SaveAsRedacted splits partially covered text, rectangular paths and axis-aligned images at operator level, then prunes unreferenced resources
Toggle PDF Optional Content Layers in Delphi with PDFium
A layer moved into /OFF still renders when its Usage dictionary says ON. PDFium Component reads Usage, Intent and /AS rules in Delphi and saves verified layers
Optional PDFium Exports: Capability Gates in Delphi
When pdfium.dll is older than the binding, one missing export can kill the load. How PDFium Component gates optional exports in Delphi and degrades safely
Shrinking PDFs in Delphi: Orphan Objects and Resource Dedup
Deleted pages and repeated logos survive FPDF_SaveAsCopy. PDFium Component for Delphi drops orphans, merges duplicate resources and recompresses Flate streams
PDF Outline Editing and Page Remapping in Delphi
How PDFiumPas rewrites PDF outline items in Delphi after pages move or disappear: signed Count, sibling chains, ApplyPageMap and verified incremental saves
PDFium Page Object Handles Stale After Transform in Delphi
Why PDFium page object handles read old coordinates after FPDFPage_TransFormWithClip in Delphi, plus the reload order and getter sentinels that fix it
PDF Parser Resource Budget in Delphi with PDFium Component
A few hundred bytes of PDF can demand an 80 MB xref table. PDFium Component caps recursion, tokens, objects, decoded bytes, ratio and time in one Delphi budget
Build a PDF Intake Review Workbench in Delphi with PDFium Component
Triage incoming PDFs in Delphi with PDFium Component: check Info dictionary and XMP metadata, spot encryption, JavaScript, and XFA, and route risky files early
PDF/A Archival Compliance in Delphi with PDFium VCL
Produce veraPDF-valid PDF/A archives in Delphi with PDFium Component: SaveAsPdfA, XMP and ICC OutputIntent injection, a/b/u conformance, and the pitfalls
PDF/A Implementation Limits and Font Encoding Checks
Why a PDF/A file fails on container size limits or a symbolic TrueType /Encoding entry, and how PDFium Component reports both from Delphi without the DLL
PDF/A Info and XMP Metadata Equivalence in Delphi
PDF/A rejects Info and XMP metadata that differ in value or RDF shape. PDFium Component compares all eight mapped fields in Delphi and rewrites the XMP side
PDF/A Preflight Validation in Delphi with PDFium VCL
Build a PDF/A preflight checker in Delphi with PDFium Component: token-scan 29 validation issues, part-aware gating, object streams, no full content parse
PDF/A-3 Associated Files and AFRelationship in Delphi
Attach XML or CSV sources to PDF/A-3 output in Delphi with PDFium Component: AFRelationship values, the /AF chain, MIME name escaping and strict page targeting
The PDFDocEncoding Off-by-One Trap in Delphi FDF Import
PDFDocEncoding puts its special block at $80, not $7F; a table shifted one row decodes every FDF symbol as its neighbor. How to pin the table with anchor tests
Validating PDF/raster Scanned Documents in Delphi
PDF/R keeps a scan to one strip image per page with no text and no fonts. How PDFium Component validates ISO 23504-1 in Delphi and what each rejection means
PDF/UA Structure Tree Validation in Delphi with PDFium
Walk the live PDF tag tree with PDFium VCL to catch PDF/UA content errors a byte-level scan misses: Figure Alt, Formula text, and unique Note IDs
PDF/VT Variable Data Printing in Delphi with PDFium VCL
Produce and validate PDF/VT-1 variable-data print files in Delphi with PDFium VCL: DPart trees, the mandatory PDF/X-4 pairing, and ISO 16612-2 pitfalls
PKCS#11 in Delphi: CK_ULONG and the Packing Trap
CK_ULONG is 4 bytes on Windows and 8 on Linux, and #pragma pack shifts the PKCS#11 function table; how PDFium Component signs PAdES through a token in Delphi
Pluggable Text Shaping: Uniscribe and HarfBuzz in Delphi
How the PDFium component routes every shaping call through one installable backend, with Uniscribe on Windows and a run-time bound HarfBuzz for FPC
Post-Signature PDF Change Analysis with PDFium in Delphi
Find what changed after a PDF was signed: the PDFium Component for Delphi rebuilds incremental revisions, grades DocMDP and FieldMDP, and flags shadow updates
Batch PDF Preflight Reports in Delphi with the PDFium Component CLI
Automate PDF/A and PDF/UA preflight in Delphi with PDFium Component: batch loops, exit codes, JSON and HTML reports, and why empty findings are not a pass
PDFium Progressive Download and Cancel in Delphi (FPDFAvail)
A linearized PDF can show page 1 while the rest still downloads. PDFium Component in Delphi drives FPDFAvail range hints, retries and a clean cancel path
Reflow PDF Content to Responsive HTML in Delphi
Untagged PDFs reflow to plain paragraphs while tagged ones keep headings and lists; PDFium Component builds the model in Delphi and exports self-contained HTML
PDFium VCL Remote PAdES Signing: HSM and Cloud Keys
An HSM or cloud key signs hours later on another machine: PDFium Component prepares the PAdES slot in Delphi, saves the session and checks the returned CMS
PDFium Delphi Viewer: Render Cache and Smooth Zoom Tactics
Keep zoom and scrolling smooth in Delphi PDF viewers with PDFium: correct cache keys, bitmap ownership, progressive rendering, and high-DPI memory budgets
Six PDFium Calls That Need the Render Lock in Delphi
PDFium is not thread-safe, so PDFium Component locks rendering, six bitmap and thumbnail accessors and page unloads per TPdf; raw C API calls need that lock too
Byte-Identical PDF Output: Reproducible Saves in Delphi
Two saves of one PDF hash differently because of /Info dates and the trailer /ID. PDFium Component SaveAsReproducible in Delphi writes byte-identical files
Encoding RSASSA-PSS-params per RFC 4055 in PDFium Delphi
RFC 4055 gives every RSASSA-PSS-params field an explicit tag; a bare saltLength INTEGER gets PSS signatures rejected. The correct DER from PDFium Component
Secure PDF Preview in Delphi Applications with PDFium Component
Harden a Delphi PDF preview pane with PDFium Component: disable JavaScript at load, intercept link clicks, filter attachments, and read encryption permissions
Silent PDF Load Failures in Delphi: Use a PDFium Load Report
TPdf.Active := True hides PDFium load errors in Delphi. Use LoadDocument with TPdfLoadOptions to get the real exception, a TPdfLoadReport and xref recovery data
Sparse Lazy PDF Object Index in Delphi with PDFiumPas
How PDFiumPas reads a single PDF object without loading the file: sparse xref section descriptors, lazy object streams, hybrid XRefStm and 1 MiB read windows
Convert Static XFA Forms to AcroForm Fields in Delphi
Static XFA forms show an upgrade notice in browser viewers. PDFium Component rebuilds them as AcroForm fields in Delphi with flags, radio groups and styling
Keeping /ParentTree and /StructParents in Sync in Delphi
A page whose MCIDs lack a /ParentTree entry fails PDF/UA reverse lookups. PDFium Component EditPdfDocumentStructure writes /StructParents and slots from Delphi
Structured PDF Text Extraction in Delphi with PDFium VCL
Two-column PDF text can run across the gutter. PDFium Component GetStructuredText in Delphi returns blocks, lines and spans in content or physical order
Subset Fonts Already Embedded in a PDF from Delphi
A CIDFont /W array may skip glyphs at the default width. PDFium Component subsets fonts already embedded in a PDF from Delphi once font metadata proves them
Control PDF Font Substitution in Delphi with PDFium
PDFium Component lets a Delphi application supply its own font bytes for non-embedded PDF fonts, replacing host font mapping with a deterministic provider
Extract Tables from PDF Pages in Delphi with PDFium
PDFium Component detects ruled and whitespace-aligned tables in PDF pages from Delphi, resolves merged cells and spans, and exports rows as CSV or JSON
Measuring PDF Text for Layout and Word Wrap in Delphi
Laying out PDF text needs string widths before you draw. See how a PDFium binding measures text without touching the page, for word wrap in Delphi
Stale Text After Editing: the PDFium FPDF_TEXTPAGE Cache
PDFium keeps a cached FPDF_TEXTPAGE handle in Delphi; after AddText, SetText, or AddPath edits it turns stale unless reloaded before the next text query
PDFium Double Rotation and Fit-Zoom Traps in Delphi
A /Rotate 90 page turns upside down when its own rotation is passed back to the renderer. How PDFium Component stacks rotation and sizes fit zoom in Delphi
ToUnicode Keying: NBSP and Soft Hyphen Extraction in Delphi
Why PDF text extraction returns U+00A0 and U+00AD for plain spaces and hyphens, and how PDFium Component keys system fonts by code point to avoid it in Delphi
BiDi Embedding Levels for PDF Text Without Uniscribe
Why porting PDF text layout off Windows means implementing UAX #9 yourself, and the two mistakes that corrupt astral characters or skip reordering entirely
PDF Text Line Selection with PDFium Char Boxes in Delphi
A PDF text page has no line objects. See how PDFium Component builds visual lines from FPDFText_GetCharBox geometry and shares one helper across selection paths
Fix PDF Table False Positives from Justified Text in Delphi
PDFium Component rejects justified PDF paragraphs as tables with a text-free corridor test at each column boundary and orders cell words by vertical overlap
Widget Index vs Annotation Index in PDFium Delphi Forms
How PDFium Component separates form field index from annotation index in Delphi: filter Widget subtypes, map at the native edge, fix headless form focus
Offline PDF Signature Revocation Checks on Windows in Delphi
PDFium VCL keeps Windows PDF signature revocation checks truly offline with the cache-only revocation flag and reports revoked and unknown evidence separately
Word-by-Word TTS Highlighting in Delphi PDFium Viewers
Sync text-to-speech with on-page word highlights in Delphi using PDFium word boxes: TrackReadingWordAt, render ordering, auto-scroll, and Unicode pitfalls
Why XFA Field Edits Vanish on Save in PDFium for Delphi
AcroForm edits commit to /V on focus loss; XFA edits reach datasets only when PDFium saves with the XFA runtime loaded. When XFA values survive in Delphi
PDFium Component XFA Save: Newlines, Emoji and restoreState
XFA fields that gain line feeds or lose emoji after save and reopen in Delphi: how PDFium Component saves values, single-stream XFA, and restoreState on reopen
Reading a PDF Paragraph Across a Page Break in Delphi
A sentence split across PDF pages needs more than joined text. Keep page and character mappings accurate for selection and speech with PDFium Component
Reading Two-Column PDFs in Delphi Without Mixing the Columns
Two-column PDF pages can read across rows instead of down columns. Use PDFium Component to order text and preserve selection in Delphi applications
Reading PDF Forms: MCID Namespaces and Reused Content
A PDF Form can be reused and share MCID numbers with its page. Trace tagged content and select the right occurrence with PDFium Component in Delphi
Printing PDF Documents with PDFium Component in Delphi
Print PDFs from Delphi with PDFium Component: render with RenderPage and rePrinting, send bitmaps through StretchDIBits, fit pages, and handle rotation
Reusable Page Stamps via Form XObjects With PDFium
Draw a watermark or logo once, place it on every page. See how PDFium's Form XObjects make reusable page stamps in Delphi, and the handle lifetime rule
Running AcroForm JavaScript in Delphi with PDFium Component
Run AcroForm JavaScript in Delphi with PDFium Component: why field calculations stay silent, V8 DLL requirements, and host events that veto risky PDF actions
Sign PDFs with PAdES B-B in Delphi Using PDFium
PDFium reads PAdES signatures but cannot create one. How PDFium Component signs a PDF at PAdES B-B in Delphi: ByteRange slot, CAdES CMS and CNG or OpenSSL keys
Splitting PDF Documents with PDFium Component in Delphi
Splitting a PDF by page, range or bookmark in Delphi is one PDFium Component loop: CreateDocument, ImportPages, a checked SaveAs and an Active reset per file
Streaming Huge PDFs on Demand With PDFium in Delphi
Stream multi-gigabyte PDFs on demand in Delphi with a TStream adapter for PDFium's FPDF_FILEACCESS callback, while enforcing its 4 GiB file-size limit
Side-by-Side PDF Comparison in Delphi with PDFium Component
Build a side-by-side PDF viewer in Delphi with PDFium Component using independent panels, per-view TPdfView.Zoom, and synchronized page navigation
Validating Compressed PDFs: Object and XRef Streams
Modern PDFs hide structure in compressed object and xref streams. See how a Delphi validator expands ObjStm and reads xref-stream trailers with PDFium
PDF/X Validation in Delphi with the PDFium Component
Print shops bounce PDF/X files for a missing TrimBox, an unset Trapped key or one unembedded font. PDFium Component ValidatePdfX finds them in Delphi first
Verify PDF Signatures on macOS with SecTrust in Delphi
How the PDFium Delphi Component verifies PDF signatures on macOS through CMSDecoder and SecTrust: joined byte ranges, status mapping and CFRelease rules
Why Validators Reject PAdES Signatures: PDFium in Delphi
Why PDF validators reject PAdES signatures: zero ByteRange fields, missing D: date prefix, and lost /Encrypt after incremental updates, with PDFium Component
PDF Attachments in Delphi with PDFium Component: Read, Add, Delete
Manage PDF attachments in Delphi with PDFium Component using AttachmentCount, Attachment, CreateAttachment, DeleteAttachment, safe paths, and in-place saves