Xbase++
Outlook --Download Attachments for a Specific Message

Demonstrates how to download the attachments for a particular email message.
Note: This example requires Chilkat v9.5.0.67 or greater.
Chilkat Xbase++ Downloads

Xbase++
LOCAL nSuccess
LOCAL oHttp
LOCAL oSbResponse
LOCAL cMessageId
LOCAL oJson
LOCAL oSbSavePath
LOCAL oAttachData
LOCAL oLastMod
LOCAL oFac
LOCAL i
LOCAL nNumMessages
LOCAL nSizeInBytes

nSuccess := 0

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

oHttp := CreateObject("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).

oHttp:AuthToken := "MICROSOFT_GRAPH_ACCESS_TOKEN"

oSbResponse := CreateObject("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

oHttp:ClearUrlVars()
oHttp:SetUrlVar("userPrincipalName", "chilkatsoft@outlook.com")

//  Assume we already have a message ID from previously listing the messages in a folder
cMessageId := "AAMkADYzZWE3YmZmLWU0YzgtNGNkZC04MGE1LWFiYTFlNTRlY2QwYQBGAAAAAAAu7cUXL5YOTrdsUIw7-v8FBwBUcG0qWqkmQYqWLHQataQxAACnwqJUAABUcG0qWqkmQYqWLHQataQxAACnwrnOAAA="
oHttp:SetUrlVar("message_id", cMessageId)

//  Send the request to download the attachments.
nSuccess := oHttp:QuickGetSb("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments", oSbResponse)
IF ((nSuccess != 1) .AND. (oHttp:LastStatus == 0))
    ? oHttp:LastErrorText
    oHttp:destroy()
    oSbResponse:destroy()
    RETURN
ENDIF

//  The attachment data is contained within the JSON response.
oJson := CreateObject("Chilkat.JsonObject")
oJson:LoadSb(oSbResponse)
oJson:EmitCompact := 0

? "Status code = " + Str(oHttp:LastStatus)
IF (oHttp:LastStatus != 200)
    ? oJson:Emit()
    ? "Failed."
ENDIF

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

oSbSavePath := CreateObject("Chilkat.StringBuilder")
oAttachData := CreateObject("Chilkat.BinData")
oLastMod := CreateObject("Chilkat.CkDateTime")
oFac := CreateObject("Chilkat.FileAccess")

i := 0
nNumMessages := oJson:SizeOfArray("value")
DO WHILE i < nNumMessages
    oJson:I := i

    ? "name: " + oJson:StringOf("value[i].name")
    ? "contentType: " + oJson:StringOf("value[i].contentType")
    nSizeInBytes := oJson:IntOf("value[i].size")
    ? "size: " + Str(nSizeInBytes)

    //  Extract the data and save to a file.
    oSbSavePath:SetString("qa_output/")
    oSbSavePath:Append(oJson:StringOf("value[i].name"))

    oAttachData:Clear()
    oAttachData:AppendEncoded(oJson:StringOf("value[i].contentBytes"), "base64")
    oAttachData:WriteFile(oSbSavePath:GetAsString())

    //  Get the last-modified date/time and set the output file's last-mod date/time..
    oLastMod:SetFromTimestamp(oJson:StringOf("value[i].lastModifiedDateTime"))
    oFac:SetLastModified(oSbSavePath:GetAsString(), oLastMod)

    ? "----"

    i := i + 1
ENDDO

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

oHttp:destroy()
oSbResponse:destroy()
oJson:destroy()
oSbSavePath:destroy()
oAttachData:destroy()
oLastMod:destroy()
oFac:destroy()