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(C++) 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.
#include <CkPdf.h> #include <CkJsonObject.h> void ChilkatSample(void) { // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkPdf pdf; // Open a PDF. // Starting in Chilkat v9.5.0.96, the LastJsonData will contain information about encryption and permissions. bool success = pdf.LoadFile("c:/someDir/sample.pdf"); if (success == false) { std::cout << pdf.lastErrorText() << "\r\n"; return; } // Examine the LastJsonData CkJsonObject *ljd = pdf.LastJsonData(); ljd->put_EmitCompact(false); std::cout << ljd->emit() << "\r\n"; // 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 // Chilkat functions returning "const char *" return a pointer to temporary internal memory owned and managed by Chilkat. // See this example explaining how this memory should be used: const char * functions. const char *pdfVersion = ljd->stringOf("pdfVersion"); const char *Filter = ljd->stringOf("encrypt.filter"); int KeyLength = ljd->IntOf("encrypt.keyLength"); int V = ljd->IntOf("encrypt.V"); int R = ljd->IntOf("encrypt.R"); int P = ljd->IntOf("encrypt.P"); const char *PrintLowResolution = ljd->stringOf("encrypt.perm.printLowResolution"); const char *PrintHighResolution = ljd->stringOf("encrypt.perm.printHighResolution"); const char *ModifyOther = ljd->stringOf("encrypt.perm.modifyOther"); const char *ModifyAnnotations = ljd->stringOf("encrypt.perm.modifyAnnotations"); const char *ModifyForms = ljd->stringOf("encrypt.perm.modifyForms"); const char *FillInForms = ljd->stringOf("encrypt.perm.fillInForms"); const char *AssembleDoc = ljd->stringOf("encrypt.perm.assembleDoc"); const char *ExtractAnyPurpose = ljd->stringOf("encrypt.perm.extractAnyPurpose"); const char *ExtractAccessibility = ljd->stringOf("encrypt.perm.extractAccessibility"); const char *Method = ljd->stringOf("encrypt.method"); } |
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