(C++) DocuSign Download Envelope Document (PDF)

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Retrieves the specified document from the envelope. The response body of this method is the PDF file as a byte stream. You can get the file name and document ID from the response's Content-Disposition header.

For more information, see https://developers.docusign.com/docs/esign-rest-api/reference/envelopes/envelopedocuments/get/

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#include <CkHttp.h>
#include <CkJsonObject.h>
#include <CkBinData.h>
#include <CkMime.h>
#include <CkStringBuilder.h>

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

    CkHttp http;
    bool success;

    // Implements the following HTTP request:
    // GET /restapi/v2.1/accounts/{accountId}/envelopes/{envelopeId}/documents/1

    // Adds the "Authorization: Bearer eyJ0eXAi.....UE8Kl_V8KroQ" header.
    CkJsonObject jsonToken;
    // Load a previously obtained OAuth2 access token.
    success = jsonToken.LoadFile("qa_data/tokens/docusign.json");
    if (success == false) {
        std::cout << jsonToken.lastErrorText() << "\r\n";
        return;
    }

    http.put_AuthToken(jsonToken.stringOf("access_token"));

    // Use your account ID and a valid envelopeId here:
    http.SetUrlVar("accountId","7f3f65ed-5e87-418d-94c1-92499ddc8252");
    http.SetUrlVar("envelopeId","90d7e40a-b4bd-4ccd-bf38-c80e37954a13");

    const char *url = "https://demo.docusign.net/restapi/v2.1/accounts/{$accountId}/envelopes/{$envelopeId}/documents/1";
    CkBinData bd;

    success = http.DownloadBd(url,bd);
    if (success == false) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    int respStatusCode = http.get_LastStatus();
    std::cout << "Response Status Code = " << respStatusCode << "\r\n";
    if (respStatusCode != 200) {
        std::cout << "Response Header:" << "\r\n";
        std::cout << http.lastResponseHeader() << "\r\n";
        // The response body contains an error message.
        std::cout << bd.getString("utf-8") << "\r\n";
        std::cout << "Failed." << "\r\n";
        return;
    }

    // The response indicated success.
    // Get the filename from the Content-Disposition header and save to a file.
    CkMime mime;
    mime.LoadMime(http.lastResponseHeader());

    const char *filename = mime.getHeaderFieldAttribute("Content-Disposition","filename");
    std::cout << "filename = " << filename << "\r\n";

    CkStringBuilder sbPath;
    sbPath.Append("C:/aaworkarea/");
    sbPath.Append(filename);
    success = bd.WriteFile(sbPath.getAsString());
    if (success == false) {
        std::cout << "Failed to save to output file." << "\r\n";
    }
    else {
        std::cout << "Wrote " << sbPath.getAsString() << "\r\n";
    }
    }