ValidatePdfR - TPdf - PDFium Delphi Component

Component: TPdf · Unit: PDFium

Inspects the active PDF for PDF/R-1 file, metadata, raster-content, strip-geometry, colour, resolution, and compression requirements

Syntax

function ValidatePdfR: TPdfRValidationResult; overload;
function ValidatePdfR(const Options: TPdfRValidationOptions): TPdfRValidationResult; overload;

Description

ValidatePdfR combines a raw-file inspection with a live PDFium page-object pass for ISO 23504-1:2020

The %PDF-raster-x.y marker, permitted headers, object-stream prohibition, catalog and Info dictionary white lists, XMP metadata, required dates, and trailer /ID
PDF 2.0 encryption dictionaries with supported /V and /R profiles when encrypted-profile enforcement is enabled
Exactly one full-page raster strip by default, with no text, path, Form XObject, or shading content
Allowed colour models, bit depths, filter chains, CCITT parameters, DCT restrictions, and effective horizontal and vertical resolution

TPdfRValidationOptions.Default checks 72 through 2400 DPI, permits 0.5 point geometry tolerance, requires a full-page strip, and enforces the encrypted PDF 2.0 profile

The result is a TPdfRValidationResult record:

Conformance — prc1 (PDF/R-1 marker found), prcNone (no marker), or prcUnknown (parse failed or document inactive).
Issues — a TPdfRValidationIssues set covering file markers, metadata, encryption profile, raster-only content, geometry, colour, resolution, and compression parameters
IsCompliant — returns True when Conformance is a real PDF/R level and Issues is empty

The method is read-only and restores the caller's active page after validation

Remarks

On unencrypted documents with a valid xref chain, the raw-file pass resolves active dictionaries and metadata through bounded sparse reads and scans the footer marker in fixed-size windows; encrypted and unsupported structures retain the compatibility path
The version marker search remains tolerant of a valid marker located outside its recommended trailer position
Calling ValidatePdfR on an inactive document returns prcUnknown with an empty issue set
Page image facts come from native metadata and object bounds without decoding or copying image payload bytes

Example

uses System.TypInfo;

var
  Outcome: TPdfRValidationResult;
  Issue: TPdfRValidationIssue;
begin
  Pdf1.FileName := 'C:\Incoming\scan.pdf';
  Pdf1.Active := True;
  Outcome := Pdf1.ValidatePdfR;
  Memo1.Lines.Add('Level: ' + GetEnumName(TypeInfo(TPdfRConformance),
    Ord(Outcome.Conformance)));
  for Issue in Outcome.Issues do
    Memo1.Lines.Add('- ' + GetEnumName(TypeInfo(TPdfRValidationIssue), Ord(Issue)));
end;

ValidatePdfR method

Component: TPdf · Unit: PDFium

Syntax

Description

Remarks

Example

See Also