(Unicode C) PDF Get Encryption and Permissions Information

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Determine 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.

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#include <C_CkPdfW.h>
#include <C_CkJsonObjectW.h>

void ChilkatSample(void)
    {
    HCkPdfW pdf;
    BOOL success;
    HCkJsonObjectW ljd;
    const wchar_t *pdfVersion;
    const wchar_t *Filter;
    int KeyLength;
    int V;
    int R;
    int P;
    const wchar_t *PrintLowResolution;
    const wchar_t *PrintHighResolution;
    const wchar_t *ModifyOther;
    const wchar_t *ModifyAnnotations;
    const wchar_t *ModifyForms;
    const wchar_t *FillInForms;
    const wchar_t *AssembleDoc;
    const wchar_t *ExtractAnyPurpose;
    const wchar_t *ExtractAccessibility;
    const wchar_t *Method;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    pdf = CkPdfW_Create();

    // Open a PDF.
    // Starting in Chilkat v9.5.0.96, the LastJsonData will contain information about encryption and permissions.
    success = CkPdfW_LoadFile(pdf,L"c:/someDir/sample.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
        CkPdfW_Dispose(pdf);
        return;
    }

    // Examine the LastJsonData
    ljd = CkPdfW_LastJsonData(pdf);
    CkJsonObjectW_putEmitCompact(ljd,FALSE);

    wprintf(L"%s\n",CkJsonObjectW_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

    // 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.

    pdfVersion = CkJsonObjectW_stringOf(ljd,L"pdfVersion");
    Filter = CkJsonObjectW_stringOf(ljd,L"encrypt.filter");
    KeyLength = CkJsonObjectW_IntOf(ljd,L"encrypt.keyLength");
    V = CkJsonObjectW_IntOf(ljd,L"encrypt.V");
    R = CkJsonObjectW_IntOf(ljd,L"encrypt.R");
    P = CkJsonObjectW_IntOf(ljd,L"encrypt.P");
    PrintLowResolution = CkJsonObjectW_stringOf(ljd,L"encrypt.perm.printLowResolution");
    PrintHighResolution = CkJsonObjectW_stringOf(ljd,L"encrypt.perm.printHighResolution");
    ModifyOther = CkJsonObjectW_stringOf(ljd,L"encrypt.perm.modifyOther");
    ModifyAnnotations = CkJsonObjectW_stringOf(ljd,L"encrypt.perm.modifyAnnotations");
    ModifyForms = CkJsonObjectW_stringOf(ljd,L"encrypt.perm.modifyForms");
    FillInForms = CkJsonObjectW_stringOf(ljd,L"encrypt.perm.fillInForms");
    AssembleDoc = CkJsonObjectW_stringOf(ljd,L"encrypt.perm.assembleDoc");
    ExtractAnyPurpose = CkJsonObjectW_stringOf(ljd,L"encrypt.perm.extractAnyPurpose");
    ExtractAccessibility = CkJsonObjectW_stringOf(ljd,L"encrypt.perm.extractAccessibility");
    Method = CkJsonObjectW_stringOf(ljd,L"encrypt.method");


    CkPdfW_Dispose(pdf);

    }