(Unicode C++) Outlook --Download Attachments for a Specific Message

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Demonstrates how to download the attachments for a particular email message.

Note: This example requires Chilkat v9.5.0.67 or greater.

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#include <CkHttpW.h>
#include <CkStringBuilderW.h>
#include <CkJsonObjectW.h>
#include <CkBinDataW.h>
#include <CkDateTimeW.h>
#include <CkFileAccessW.h>

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

    CkHttpW http;

    // Use your previously obtained access token here:
    // See the following examples for getting an access token:
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
    //    Refresh Access Token (Azure AD v2.0 Endpoint).
    //    Refresh Access Token (Azure AD Endpoint).

    http.put_AuthToken(L"MICROSOFT_GRAPH_ACCESS_TOKEN");

    CkStringBuilderW sbResponse;

    // Sends:  GET /users/{user_id | userPrincipalName}/messages/{message_id}/attachments
    // Note: It is also possible to use the literal string "me" for the current logged-on user.
    // For example: GET /me/messages/{message_id}/attachments

    http.ClearUrlVars();
    http.SetUrlVar(L"userPrincipalName",L"chilkatsoft@outlook.com");

    // Assume we already have a message ID from previously listing the messages in a folder
    const wchar_t *messageId = L"AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAA==";
    http.SetUrlVar(L"message_id",messageId);

    // Send the request to download the attachments.
    bool success = http.QuickGetSb(L"https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments",sbResponse);
    if ((success != true) && (http.get_LastStatus() == 0)) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    // The attachment data is contained within the JSON response.
    CkJsonObjectW json;
    json.LoadSb(sbResponse);
    json.put_EmitCompact(false);

    wprintf(L"Status code = %d\n",http.get_LastStatus());
    if (http.get_LastStatus() != 200) {
        wprintf(L"%s\n",json.emit());
        wprintf(L"Failed.\n");
    }

    // This is a sample JSON response.  The code for parsing and extracting/saving the attachments
    // is shown below.

    // 	{
    // 	  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('chilkatsoft%40outlook.com')/messages('AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAA%3D%3D')/attachments",
    // 	  "value": [
    // 	    {
    // 	      "@odata.type": "#microsoft.graph.fileAttachment",
    // 	      "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAft6wtbaSJU6sgQLi98DI0Q==",
    // 	      "lastModifiedDateTime": "2017-05-10T00:30:51Z",
    // 	      "name": "fishing.pdf",
    // 	      "contentType": "application/pdf",
    // 	      "size": 295680,
    // 	      "isInline": false,
    // 	      "contentId": "F861B218BE380F44B16933097FDDACFC@namprd20.prod.outlook.com",
    // 	      "contentLocation": null,
    // 	      "contentBytes": "JVBERi0xLjMKJcfsj6 ... yZWYKMjk0MzY5CiUlRU9GCg=="
    // 	    },
    // 	    {
    // 	      "@odata.type": "#microsoft.graph.fileAttachment",
    // 	      "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAXS7qXQ-iRUCYXnhJpN8Ihg==",
    // 	      "lastModifiedDateTime": "2017-05-10T00:30:51Z",
    // 	      "name": "testCert.cer",
    // 	      "contentType": "application/octet-stream",
    // 	      "size": 1674,
    // 	      "isInline": false,
    // 	      "contentId": "5E51FA33EF0F8941ACC8260395CB1A33@namprd20.prod.outlook.com",
    // 	      "contentLocation": null,
    // 	      "contentBytes": "MIIFRjCCBC6gAwIBA ... 7pt3C5w=="
    // 	    }
    // 	  ]
    // 	}

    CkStringBuilderW sbSavePath;
    CkBinDataW attachData;
    CkDateTimeW lastMod;
    CkFileAccessW fac;

    int i = 0;
    int numMessages = json.SizeOfArray(L"value");
    while (i < numMessages) {
        json.put_I(i);

        wprintf(L"name: %s\n",json.stringOf(L"value[i].name"));
        wprintf(L"contentType: %s\n",json.stringOf(L"value[i].contentType"));
        int sizeInBytes = json.IntOf(L"value[i].size");
        wprintf(L"size: %d\n",sizeInBytes);

        // Extract the data and save to a file.
        sbSavePath.SetString(L"qa_output/");
        sbSavePath.Append(json.stringOf(L"value[i].name"));

        attachData.Clear();
        attachData.AppendEncoded(json.stringOf(L"value[i].contentBytes"),L"base64");
        attachData.WriteFile(sbSavePath.getAsString());

        // Get the last-modified date/time and set the output file's last-mod date/time..
        lastMod.SetFromTimestamp(json.stringOf(L"value[i].lastModifiedDateTime"));
        fac.SetLastModified(sbSavePath.getAsString(),lastMod);

        wprintf(L"----\n");

        i = i + 1;
    }

    // The output of the above loop is:
    // 
    // 	name: fishing.pdf
    // 	contentType: application/pdf
    // 	size: 295680
    // 	----
    // 	name: testCert.cer
    // 	contentType: application/octet-stream
    // 	size: 1674
    // 	----
    // 
    }