(C++) SharePoint -- Download Newer Files

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Demonstrates how to download all files from a SharePoint folder that are newer than the local files.

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#include <CkHttp.h>
#include <CkStringBuilder.h>
#include <CkFileAccess.h>
#include <CkJsonObject.h>
#include <CkDateTime.h>

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

    // -------------------------------------------------------------------------
    // The following comments apply to SharePoint Windows classic authentication.
    // -------------------------------------------------------------------------
    // For example, imagine our SharePoint endpoint is https://xyzoffice.mycompany.com/
    // The SHAREPOINT_NTLM_DOMAIN would be "mycompany.com"
    // The SHAREPOINT_HTTPS_DOMAIN would be "xyzoffice.mycompany.com"
    // Also, the SHAREPOINT_USERNAME would be just the name, not a full email address.
    // for example, "chilkat" instead of "chilkat@mycompany.com"

    CkHttp http;

    // If SharePoint Windows classic authentication is used, then set the 
    // Login, Password, LoginDomain, and NtlmAuth properties.
    http.put_Login("SHAREPOINT_USERNAME");
    http.put_Password("SHAREPOINT_PASSWORD");
    http.put_LoginDomain("SHAREPOINT_NTLM_DOMAIN");
    http.put_NtlmAuth(true);

    // -------------------------------------------------------------------------
    // The more common case is to use SharePoint Online authentication (via the SPOIDCRL cookie).
    // If so, do not set Login, Password, LoginDomain, and NtlmAuth, and instead
    // establish the cookie as shown at SharePoint Online Authentication
    // -------------------------------------------------------------------------

    // First we'll download a list of all the files in the /Documents folder.
    // This provides the names and last-modified date/times of the files located
    // on the SharePoint server.
    http.put_Accept("application/json;odata=verbose");
    http.put_AcceptCharset("utf-8");

    CkStringBuilder sbJson;
    bool success = http.QuickGetSb("https://SHAREPOINT_HTTPS_DOMAIN/_api/web/GetFolderByServerRelativeUrl('/Documents')/Files",sbJson);
    if (success != true) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    // Before proceeding, make sure the local directory where we'll be downloading files exists.
    CkFileAccess fac;
    fac.DirEnsureExists("qa_output/sharepoint/Documents");

    // OK.. load the JSON and iterate over each file
    CkJsonObject json;
    json.LoadSb(sbJson);

    int numFiles = json.SizeOfArray("d.results");
    std::cout << "Number of Files in the SharePoint /Documents folder = " << numFiles << "\r\n";

    CkDateTime lastModRemote;
    CkDateTime *lastModLocal = 0;

    CkStringBuilder localPath;
    CkStringBuilder fileUrl;

    int i = 0;
    while (i < numFiles) {
        json.put_I(i);

        const char *filename = json.stringOf("d.results[i].Name");
        const char *sLastModified = json.stringOf("d.results[i].TimeLastModified");

        std::cout << (i + 1) << ": " << filename << " (" << sLastModified << ")" << "\r\n";

        lastModRemote.SetFromTimestamp(sLastModified);

        bool bDownload = false;
        // Check to see if the local file exists.  If not, then download.
        localPath.SetString("qa_output/sharepoint/Documents/");
        localPath.Append(filename);
        if (fac.FileExists(localPath.getAsString()) != true) {
            std::cout << "This file does not exist locally." << "\r\n";
            bDownload = true;
        }
        else {
            // Get the local file's date time and compare with the remote file date/time.
            lastModLocal = fac.GetLastModified(localPath.getAsString());
            if (fac.get_LastMethodSuccess() == true) {
                // Get the difference in seconds between the local and remote last-modified times.
                // if the return value is negative, then the caller's time is 
                // older than the argument.  (in this case, a negative return value means
                // the local file is older than the remote file.

                // Note: The DiffSeconds method was found to be missing in the Chilkat .NET build
                // (and possibly in other builds). It will be present in the v9.5.0.67 release and later.
                int numSeconds = lastModLocal->DiffSeconds(lastModRemote);
                if (numSeconds < 0) {
                    std::cout << "The local file is older than the remote file." << "\r\n";
                    bDownload = true;
                }

                delete lastModLocal;
            }
            else {
                std::cout << "Unable to get the local file's last-modified date/time." << "\r\n";
                std::cout << fac.lastErrorText() << "\r\n";
            }

        }

        if (bDownload == true) {
            fileUrl.SetString("https://SHAREPOINT_HTTPS_DOMAIN/_api/web/GetFolderByServerRelativeUrl('/Documents')/Files('");
            fileUrl.Append(filename);
            fileUrl.Append("')/$value");

            std::cout << "Downloading " << filename << "\r\n";

            success = http.Download(fileUrl.getAsString(),localPath.getAsString());
            if (success != true) {
                std::cout << http.lastErrorText() << "\r\n";
                return;
            }

            // Set the local file's last-modified date/time to that of the server's.
            fac.SetLastModified(localPath.getAsString(),lastModRemote);

        }

        i = i + 1;
    }

    std::cout << "All finished." << "\r\n";
    }