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(Delphi DLL) PDF Get Encryption and Permissions InformationSee more PDF Signatures ExamplesDetermine if a PDF is encrypted, and the associated user permissions. Note: Some PDFs are encrypted but not password-protected. In such cases, encryption is used primarily for preventing unauthorized modifications to the document, but it doesn't restrict access. Therefore, you can open and read the document without a password. Note: This example requires Chilkat v9.5.0.96 or later.
uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Pdf, JsonObject; ... procedure TForm1.Button1Click(Sender: TObject); var pdf: HCkPdf; success: Boolean; ljd: HCkJsonObject; pdfVersion: PWideChar; Filter: PWideChar; KeyLength: Integer; V: Integer; R: Integer; P: Integer; PrintLowResolution: PWideChar; PrintHighResolution: PWideChar; ModifyOther: PWideChar; ModifyAnnotations: PWideChar; ModifyForms: PWideChar; FillInForms: PWideChar; AssembleDoc: PWideChar; ExtractAnyPurpose: PWideChar; ExtractAccessibility: PWideChar; Method: PWideChar; begin // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. pdf := CkPdf_Create(); // Open a PDF. // Starting in Chilkat v9.5.0.96, the LastJsonData will contain information about encryption and permissions. success := CkPdf_LoadFile(pdf,'c:/someDir/sample.pdf'); if (success = False) then begin Memo1.Lines.Add(CkPdf__lastErrorText(pdf)); Exit; end; // Examine the LastJsonData ljd := CkPdf_LastJsonData(pdf); CkJsonObject_putEmitCompact(ljd,False); Memo1.Lines.Add(CkJsonObject__emit(ljd)); // Sample output: // { // "pdfVersion": "1.6", // "encrypt": { // "filter": "/Standard", // "keyLength": 128, // "V": 4, // "R": 4, // "P": -1340, // "perm": { // "printLowResolution": "allowed", // "printHighResolution": "allowed", // "modifyOther": "not allowed", // "modifyAnnotations": "allowed", // "modifyForms": "not allowed", // "fillInForms": "allowed", // "assembleDoc": "allowed", // "extractAnyPurpose": "not allowed", // "extractAccessibility": "not allowed" // }, // "method": "AESV2" // } // } // Use this online tool to generate parsing code from sample JSON: // Generate Parsing Code from JSON pdfVersion := CkJsonObject__stringOf(ljd,'pdfVersion'); Filter := CkJsonObject__stringOf(ljd,'encrypt.filter'); KeyLength := CkJsonObject_IntOf(ljd,'encrypt.keyLength'); V := CkJsonObject_IntOf(ljd,'encrypt.V'); R := CkJsonObject_IntOf(ljd,'encrypt.R'); P := CkJsonObject_IntOf(ljd,'encrypt.P'); PrintLowResolution := CkJsonObject__stringOf(ljd,'encrypt.perm.printLowResolution'); PrintHighResolution := CkJsonObject__stringOf(ljd,'encrypt.perm.printHighResolution'); ModifyOther := CkJsonObject__stringOf(ljd,'encrypt.perm.modifyOther'); ModifyAnnotations := CkJsonObject__stringOf(ljd,'encrypt.perm.modifyAnnotations'); ModifyForms := CkJsonObject__stringOf(ljd,'encrypt.perm.modifyForms'); FillInForms := CkJsonObject__stringOf(ljd,'encrypt.perm.fillInForms'); AssembleDoc := CkJsonObject__stringOf(ljd,'encrypt.perm.assembleDoc'); ExtractAnyPurpose := CkJsonObject__stringOf(ljd,'encrypt.perm.extractAnyPurpose'); ExtractAccessibility := CkJsonObject__stringOf(ljd,'encrypt.perm.extractAccessibility'); Method := CkJsonObject__stringOf(ljd,'encrypt.method'); CkPdf_Dispose(pdf); end; |
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