(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.

This example applies to: Exchange Online | Office 365 | Hotmail.com | Live.com | MSN.com | Outlook.com | Passport.com

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

Chilkat.Http http = new Chilkat.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.AuthToken = "MICROSOFT_GRAPH_ACCESS_TOKEN";

Chilkat.StringBuilder sbResponse = new Chilkat.StringBuilder();

// 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("userPrincipalName","chilkatsoft@outlook.com");

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

// Send the request to download the attachments.
bool success = http.QuickGetSb("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments",sbResponse);
if ((success != true) && (http.LastStatus == 0)) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

// The attachment data is contained within the JSON response.
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.LoadSb(sbResponse);
json.EmitCompact = false;

Debug.WriteLine("Status code = " + Convert.ToString(http.LastStatus));
if (http.LastStatus != 200) {
    Debug.WriteLine(json.Emit());
    Debug.WriteLine("Failed.");
}

// 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=="
// 	    }
// 	  ]
// 	}

Chilkat.StringBuilder sbSavePath = new Chilkat.StringBuilder();
Chilkat.BinData attachData = new Chilkat.BinData();
Chilkat.CkDateTime lastMod = new Chilkat.CkDateTime();
Chilkat.FileAccess fac = new Chilkat.FileAccess();

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

    Debug.WriteLine("name: " + json.StringOf("value[i].name"));
    Debug.WriteLine("contentType: " + json.StringOf("value[i].contentType"));
    int sizeInBytes = json.IntOf("value[i].size");
    Debug.WriteLine("size: " + Convert.ToString(sizeInBytes));

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

    attachData.Clear();
    attachData.AppendEncoded(json.StringOf("value[i].contentBytes"),"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("value[i].lastModifiedDateTime"));
    fac.SetLastModified(sbSavePath.GetAsString(),lastMod);

    Debug.WriteLine("----");

    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
// 	----
//