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(Unicode C) Sign PDF with Invisible SignatureSee more PDF Signatures ExamplesDemonstrates how to sign a PDF with an invisible signature. Note: This example requires Chilkat v9.5.0.85 or greater.
#include <C_CkPdfW.h> #include <C_CkJsonObjectW.h> #include <C_CkCertW.h> void ChilkatSample(void) { HCkPdfW pdf; BOOL success; HCkJsonObjectW json; HCkCertW cert; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. pdf = CkPdfW_Create(); // Load a PDF to be signed. // The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf success = CkPdfW_LoadFile(pdf,L"qa_data/pdf/hello.pdf"); if (success == FALSE) { wprintf(L"%s\n",CkPdfW_lastErrorText(pdf)); CkPdfW_Dispose(pdf); return; } // Options for signing are specified in JSON. json = CkJsonObjectW_Create(); // In most cases, the signingCertificateV2 and signingTime attributes are required. CkJsonObjectW_UpdateInt(json,L"signingCertificateV2",1); CkJsonObjectW_UpdateInt(json,L"signingTime",1); // Indicate that the signature will be invisible. CkJsonObjectW_UpdateBool(json,L"invisibleSignature",TRUE); // Load the signing certificate. (Use your own certificate.) cert = CkCertW_Create(); success = CkCertW_LoadPfxFile(cert,L"qa_data/pfx/myPdfSigningCert.pfx",L"secret"); if (success == FALSE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(json); CkCertW_Dispose(cert); return; } // Tell the pdf object to use the certificate for signing. success = CkPdfW_SetSigningCert(pdf,cert); if (success == FALSE) { wprintf(L"%s\n",CkPdfW_lastErrorText(pdf)); CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(json); CkCertW_Dispose(cert); return; } success = CkPdfW_SignPdf(pdf,json,L"qa_output/hello_signed.pdf"); if (success == FALSE) { wprintf(L"%s\n",CkPdfW_lastErrorText(pdf)); CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(json); CkCertW_Dispose(cert); return; } wprintf(L"PDF successfully signed with an invisible signature.\n"); // An invisible signature has no appearance within the PDF document itself, // but Adobe Acrobat will indicate the document is signed in a toolbar, as shown here: CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(json); CkCertW_Dispose(cert); } |
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