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(Delphi DLL) OneDrive -- List Large DirectoryDemonstrates how to get the entire collection of DriveItem children when the collection is large and multiple pages need to be requested. To test this example, I created a DriveItem with 450 children. Note: This example requires Chilkat v9.5.0.68 or greater.
uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, JsonObject, Http; ... procedure TForm1.Button1Click(Sender: TObject); var http: HCkHttp; resp: PWideChar; i: Integer; numItems: Integer; json: HCkJsonObject; bGetMore: Boolean; nextLink: PWideChar; begin // 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). // (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.) CkHttp_putAuthToken(http,'MICROSOFT_GRAPH_ACCESS_TOKEN'); // This example will get the DriveItems in /lots-of-files, which has 450 children.. CkHttp_SetUrlVar(http,'item_path','/lots-of-files'); json := CkJsonObject_Create(); CkJsonObject_putEmitCompact(json,False); // This loop will download DriveItems in sets of 50 until no more exist. bGetMore := True; // (Add the $top query parameter to define the page size, i.e. the max number of results to return). nextLink := 'https://graph.microsoft.com/v1.0/me/drive/root:{$item_path}:/children?$top=50'; while (bGetMore = True) do begin // Get the next chunk of DriveItems resp := CkHttp__quickGetStr(http,nextLink); if (CkHttp_getLastMethodSuccess(http) <> True) then begin Memo1.Lines.Add(CkHttp__lastErrorText(http)); Exit; end; // The response should be JSON. CkJsonObject_Load(json,resp); // A successful response should return a status code of 200. if (CkHttp_getLastStatus(http) <> 200) then begin Memo1.Lines.Add(CkJsonObject__emit(json)); Memo1.Lines.Add('Response status = ' + IntToStr(CkHttp_getLastStatus(http))); Exit; end; // Iterate over the DriveItems in the JSON response: i := 0; numItems := CkJsonObject_SizeOfArray(json,'value'); while i < numItems do begin CkJsonObject_putI(json,i); Memo1.Lines.Add('name: ' + CkJsonObject__stringOf(json,'value[i].name')); i := i + 1; end; // If a nextLink was included in the JSON, use it to get the next set of 50 DriveItems. // Otherwise, exit the loop. if (CkJsonObject_HasMember(json,'"@odata.nextLink"') = True) then begin nextLink := CkJsonObject__stringOf(json,'"@odata.nextLink"'); Memo1.Lines.Add('nextLink: ' + nextLink); end else begin bGetMore := False; end; end; CkHttp_Dispose(http); CkJsonObject_Dispose(json); end; |
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