(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 <C_CkHttp.h>
#include <C_CkStringBuilder.h>
#include <C_CkJsonObject.h>
#include <C_CkBinData.h>
#include <C_CkDateTime.h>
#include <C_CkFileAccess.h>

void ChilkatSample(void)
    {
    HCkHttp http;
    HCkStringBuilder sbResponse;
    const char *messageId;
    BOOL success;
    HCkJsonObject json;
    HCkStringBuilder sbSavePath;
    HCkBinData attachData;
    HCkDateTime lastMod;
    HCkFileAccess fac;
    int i;
    int numMessages;
    int sizeInBytes;

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

    http = CkHttp_Create();

    // 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).

    CkHttp_putAuthToken(http,"MICROSOFT_GRAPH_ACCESS_TOKEN");

    sbResponse = CkStringBuilder_Create();

    // 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

    CkHttp_ClearUrlVars(http);
    CkHttp_SetUrlVar(http,"userPrincipalName","chilkatsoft@outlook.com");

    // Assume we already have a message ID from previously listing the messages in a folder
    messageId = "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAA==";
    CkHttp_SetUrlVar(http,"message_id",messageId);

    // Send the request to download the attachments.
    success = CkHttp_QuickGetSb(http,"https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments",sbResponse);
    if ((success != TRUE) && (CkHttp_getLastStatus(http) == 0)) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkStringBuilder_Dispose(sbResponse);
        return;
    }

    // The attachment data is contained within the JSON response.
    json = CkJsonObject_Create();
    CkJsonObject_LoadSb(json,sbResponse);
    CkJsonObject_putEmitCompact(json,FALSE);

    printf("Status code = %d\n",CkHttp_getLastStatus(http));
    if (CkHttp_getLastStatus(http) != 200) {
        printf("%s\n",CkJsonObject_emit(json));
        printf("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=="
    // 	    }
    // 	  ]
    // 	}

    sbSavePath = CkStringBuilder_Create();
    attachData = CkBinData_Create();
    lastMod = CkDateTime_Create();
    fac = CkFileAccess_Create();

    i = 0;
    numMessages = CkJsonObject_SizeOfArray(json,"value");
    while (i < numMessages) {
        CkJsonObject_putI(json,i);

        printf("name: %s\n",CkJsonObject_stringOf(json,"value[i].name"));
        printf("contentType: %s\n",CkJsonObject_stringOf(json,"value[i].contentType"));
        sizeInBytes = CkJsonObject_IntOf(json,"value[i].size");
        printf("size: %d\n",sizeInBytes);

        // Extract the data and save to a file.
        CkStringBuilder_SetString(sbSavePath,"qa_output/");
        CkStringBuilder_Append(sbSavePath,CkJsonObject_stringOf(json,"value[i].name"));

        CkBinData_Clear(attachData);
        CkBinData_AppendEncoded(attachData,CkJsonObject_stringOf(json,"value[i].contentBytes"),"base64");
        CkBinData_WriteFile(attachData,CkStringBuilder_getAsString(sbSavePath));

        // Get the last-modified date/time and set the output file's last-mod date/time..
        CkDateTime_SetFromTimestamp(lastMod,CkJsonObject_stringOf(json,"value[i].lastModifiedDateTime"));
        CkFileAccess_SetLastModified(fac,CkStringBuilder_getAsString(sbSavePath),lastMod);

        printf("----\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
    // 	----
    // 


    CkHttp_Dispose(http);
    CkStringBuilder_Dispose(sbResponse);
    CkJsonObject_Dispose(json);
    CkStringBuilder_Dispose(sbSavePath);
    CkBinData_Dispose(attachData);
    CkDateTime_Dispose(lastMod);
    CkFileAccess_Dispose(fac);

    }