(Objective-C) 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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#import <CkoHttp.h>
#import <CkoStringBuilder.h>
#import <CkoJsonObject.h>
#import <CkoHashtable.h>
#import <NSString.h>

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

CkoHttp *http = [[CkoHttp alloc] init];

// 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";

CkoStringBuilder *sbResponse = [[CkoStringBuilder alloc] init];

// This gets the combined total number of emails in all folders.
BOOL success = [http QuickGetSb: @"https://graph.microsoft.com/v1.0/me/messages/$count" sbContent: sbResponse];
if ((success != YES) && ([http.LastStatus intValue] == 0)) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoJsonObject *json = [[CkoJsonObject alloc] init];
json.EmitCompact = NO;

// If the status code was not 200, then it failed and the response is likely JSON:
if ([http.LastStatus intValue] != 200) {
    NSLog(@"%@%d",@"Status code = ",[http.LastStatus intValue]);
    [json LoadSb: sbResponse];
    NSLog(@"%@",[json Emit]);
    NSLog(@"%@",@"Failed.");
    return;
}

// A success response payload contains just the integer value (it is not JSON)
NSLog(@"%@%@",@"Combined Total Number of Emails = ",[sbResponse GetAsString]);
NSLog(@"%@",@"--");

// ---------------------------------------------------------------------------
// 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)
CkoHashtable *htFolderMap = [[CkoHashtable alloc] init];
CkoStringBuilder *sbMap = [[CkoStringBuilder alloc] init];
[sbMap LoadFile: @"qa_data/outlook/folderMap.xml" charset: @"utf-8"];
[htFolderMap AddFromXmlSb: sbMap];

// Get the ID for the "/Inbox/abc" folder:
NSString *folderId = [htFolderMap LookupStr: @"/Inbox/abc"];
if (htFolderMap.LastMethodSuccess != YES) {
    NSLog(@"%@",@"Folder ID not found");
    return;
}

[http SetUrlVar: @"folder_id" value: folderId];

// Send the request get the folder information.
// In this case we are NOT using the $count system query option.
success = [http QuickGetSb: @"https://graph.microsoft.com/v1.0/me/mailFolders/{$folder_id}" sbContent: sbResponse];
if ((success != YES) && ([http.LastStatus intValue] == 0)) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

[json LoadSb: sbResponse];
NSLog(@"%@",[json Emit]);
NSLog(@"%@",@"--");

if ([http.LastStatus intValue] != 200) {
    NSLog(@"%@%d",@"Status code = ",[http.LastStatus intValue]);
    NSLog(@"%@",@"Failed.");
    return;
}

// 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:
int totalItemCount = [[json IntOf: @"totalItemCount"] intValue];
NSLog(@"%@%d",@"totalItemCount = ",totalItemCount);

int childFolderCount = [[json IntOf: @"childFolderCount"] intValue];
NSLog(@"%@%d",@"childFolderCount = ",childFolderCount);

// etc..