DataFlex
Outlook -- Get Number of Emails

Gets the number of emails in an Outlook folder. This uses the OData $count system query option. See OData System Query Option $count for general information.
This example first gets the combined total number of messages across all folders.
Note: This example requires Chilkat v9.5.0.68 or greater.
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Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoHttp
    Variant vSbResponse
    Handle hoSbResponse
    Handle hoJson
    Handle hoHtFolderMap
    Variant vSbMap
    Handle hoSbMap
    String sFolderId
    Integer iTotalItemCount
    Integer iChildFolderCount
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

    Move False To iSuccess

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

    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End

    // 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).

    Set ComAuthToken Of hoHttp To "MICROSOFT_GRAPH_ACCESS_TOKEN"

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbResponse
    If (Not(IsComObjectCreated(hoSbResponse))) Begin
        Send CreateComObject of hoSbResponse
    End

    // This gets the combined total number of emails in all folders.
    Get pvComObject of hoSbResponse to vSbResponse
    Get ComQuickGetSb Of hoHttp "https://graph.microsoft.com/v1.0/me/messages/$count" vSbResponse To iSuccess
    Get ComLastStatus Of hoHttp To iTemp1
    If ((iSuccess <> True) And (iTemp1 = 0)) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Set ComEmitCompact Of hoJson To False

    // If the status code was not 200, then it failed and the response is likely JSON:
    Get ComLastStatus Of hoHttp To iTemp1
    If (iTemp1 <> 200) Begin
        Get ComLastStatus Of hoHttp To iTemp1
        Showln "Status code = " iTemp1
        Get pvComObject of hoSbResponse to vSbResponse
        Get ComLoadSb Of hoJson vSbResponse To iSuccess
        Get ComEmit Of hoJson To sTemp1
        Showln sTemp1
        Showln "Failed."
        Procedure_Return
    End

    // A success response payload contains just the integer value (it is not JSON)
    Get ComGetAsString Of hoSbResponse To sTemp1
    Showln "Combined Total Number of Emails = " sTemp1
    Showln "--"

    // ---------------------------------------------------------------------------
    // To get the number of emails in a particular folder, we need to use the folder id.
    // 

    // In this example, we'd like to get number of messages in the folder "/Inbox/abc",
    // but we must specify the corresponding folder_id.  The best way to do this is to create
    // a local map of folderPaths-to-folderIds.
    // We'll use the map created by this example:  Create Outlook Folder Map)
    Get Create (RefClass(cComChilkatHashtable)) To hoHtFolderMap
    If (Not(IsComObjectCreated(hoHtFolderMap))) Begin
        Send CreateComObject of hoHtFolderMap
    End
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbMap
    If (Not(IsComObjectCreated(hoSbMap))) Begin
        Send CreateComObject of hoSbMap
    End
    Get ComLoadFile Of hoSbMap "qa_data/outlook/folderMap.xml" "utf-8" To iSuccess
    Get pvComObject of hoSbMap to vSbMap
    Get ComAddFromXmlSb Of hoHtFolderMap vSbMap To iSuccess

    // Get the ID for the "/Inbox/abc" folder:
    Get ComLookupStr Of hoHtFolderMap "/Inbox/abc" To sFolderId
    Get ComLastMethodSuccess Of hoHtFolderMap To bTemp1
    If (bTemp1 <> True) Begin
        Showln "Folder ID not found"
        Procedure_Return
    End

    Get ComSetUrlVar Of hoHttp "folder_id" sFolderId To iSuccess

    // Send the request get the folder information.
    // In this case we are NOT using the $count system query option.
    Get pvComObject of hoSbResponse to vSbResponse
    Get ComQuickGetSb Of hoHttp "https://graph.microsoft.com/v1.0/me/mailFolders/{$folder_id}" vSbResponse To iSuccess
    Get ComLastStatus Of hoHttp To iTemp1
    If ((iSuccess <> True) And (iTemp1 = 0)) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get pvComObject of hoSbResponse to vSbResponse
    Get ComLoadSb Of hoJson vSbResponse To iSuccess
    Get ComEmit Of hoJson To sTemp1
    Showln sTemp1
    Showln "--"

    Get ComLastStatus Of hoHttp To iTemp1
    If (iTemp1 <> 200) Begin
        Get ComLastStatus Of hoHttp To iTemp1
        Showln "Status code = " iTemp1
        Showln "Failed."
        Procedure_Return
    End

    // The successful JSON response looks like this;

    // 	{
    // 	  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('me')/mailFolders/$entity",
    // 	  "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAAA=",
    // 	  "displayName": "abc",
    // 	  "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEMAAAA",
    // 	  "childFolderCount": 2,
    // 	  "unreadItemCount": 0,
    // 	  "totalItemCount": 3
    // 	}
    // 

    // Get the integer value from the JSON like this:
    Get ComIntOf Of hoJson "totalItemCount" To iTotalItemCount
    Showln "totalItemCount = " iTotalItemCount

    Get ComIntOf Of hoJson "childFolderCount" To iChildFolderCount
    Showln "childFolderCount = " iChildFolderCount

    // etc..


End_Procedure