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(Unicode C) PDF Sign Unsigned Signature FieldSee more PDF Signatures ExamplesDemonstrates how to sign a PDF's unsigned signature field. 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 containing an unsigned signature field. success = CkPdfW_LoadFile(pdf,L"qa_data/pdf/unsigned_sig_field/due_diligence.pdf"); if (success == FALSE) { wprintf(L"%s\n",CkPdfW_lastErrorText(pdf)); CkPdfW_Dispose(pdf); return; } // A PDF with an unsigned signature field appears in Adobe Acrobat as shown below. // (When the mouse pointer is hovered over the field, a tooltip will likely show a message // such as "Unsigned signature field (Click to sign)". // This example code will automatically find the unsigned signature field, // and signs using your certificate. It automatically sizes the text to the space alotted // for the signature. // 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); // We don't specify the page or a specific location because Chilkat will automatically // find the unsigned signature field and use its location and size and will scale the // signatures visual appearance (text + graphics) to the correct size required to fit. // We only need to indicate the desire to fill the unsigned signature field. CkJsonObjectW_UpdateBool(json,L"appearance.fillUnsignedSignatureField",TRUE); // Starting in Chilkat v9.5.0.90, if a PDF contains multiple unsigned signature fields, // the field to be signed can be chosen by name: // To list unsigned signature fields, see this example: List PDF Unsigned Signature Fields CkJsonObjectW_UpdateString(json,L"unsignedSignatureField",L"doctor_signature"); // Note: If the PDF document contains multiple unsigned signature fields, Chilkat will // sign the 1st one found. // In this example, the appearance of the digital signature will contain three lines: // 1) The signing certificate's common name // 2) The current date/time // 3) Some arbitrary text. // The keyword "cert_cn" is replaced with the Certificate's Subject Common Name. // The keyword "current_dt" is replaced with the current date/time. // Any number of appearance text lines can be added. CkJsonObjectW_UpdateString(json,L"appearance.text[0]",L"Digitally signed by: cert_cn"); CkJsonObjectW_UpdateString(json,L"appearance.text[1]",L"current_dt"); CkJsonObjectW_UpdateString(json,L"appearance.text[2]",L"The crazy brown fox jumps over the lazy dog."); // This signature will include one of the built-in SVG graphics (green-check-grey-circle). CkJsonObjectW_UpdateString(json,L"appearance.image",L"green-check-grey-circle"); CkJsonObjectW_UpdateString(json,L"appearance.imagePlacement",L"left"); // 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/due_diligence_signed.pdf"); if (success == FALSE) { wprintf(L"%s\n",CkPdfW_lastErrorText(pdf)); CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(json); CkCertW_Dispose(cert); return; } wprintf(L"The PDF has been successfully cryptographically signed.\n"); // The appearance of the signature appears in Adobe Acrobat as shown below. CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(json); CkCertW_Dispose(cert); } |
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