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(Unicode 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 v11.0.0 or greater.
#include <CkPdfW.h> #include <CkJsonObjectW.h> void ChilkatSample(void) { bool success = false; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkPdfW pdf; // Load a PDF. success = pdf.LoadFile(L"c:/someDir/sample.pdf"); if (success == false) { wprintf(L"%s\n",pdf.lastErrorText()); return; } // Get information about the PDF that was collected in the call to LoadFile. CkJsonObjectW ljd; pdf.GetLastJsonData(ljd); ljd.put_EmitCompact(false); wprintf(L"%s\n",ljd.emit()); // 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 wchar_t *pdfVersion = ljd.stringOf(L"pdfVersion"); const wchar_t *Filter = ljd.stringOf(L"encrypt.filter"); int KeyLength = ljd.IntOf(L"encrypt.keyLength"); int V = ljd.IntOf(L"encrypt.V"); int R = ljd.IntOf(L"encrypt.R"); int P = ljd.IntOf(L"encrypt.P"); const wchar_t *PrintLowResolution = ljd.stringOf(L"encrypt.perm.printLowResolution"); const wchar_t *PrintHighResolution = ljd.stringOf(L"encrypt.perm.printHighResolution"); const wchar_t *ModifyOther = ljd.stringOf(L"encrypt.perm.modifyOther"); const wchar_t *ModifyAnnotations = ljd.stringOf(L"encrypt.perm.modifyAnnotations"); const wchar_t *ModifyForms = ljd.stringOf(L"encrypt.perm.modifyForms"); const wchar_t *FillInForms = ljd.stringOf(L"encrypt.perm.fillInForms"); const wchar_t *AssembleDoc = ljd.stringOf(L"encrypt.perm.assembleDoc"); const wchar_t *ExtractAnyPurpose = ljd.stringOf(L"encrypt.perm.extractAnyPurpose"); const wchar_t *ExtractAccessibility = ljd.stringOf(L"encrypt.perm.extractAccessibility"); const wchar_t *Method = ljd.stringOf(L"encrypt.method"); } |
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