(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 <CkPdfW.h>
#include <CkJsonObjectW.h>

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

    CkPdfW pdf;

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

    // Examine the LastJsonData
    CkJsonObjectW *ljd = pdf.LastJsonData();
    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");
    }