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(Delphi DLL) Download GMail Message Attachment by IDDemonstrates how to download a GMail email attachment by the attachment ID. For more information, see https://developers.google.com/gmail/api/v1/reference/users/messages/attachments/get
uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, StringBuilder, BinData, JsonObject; ... procedure TForm1.Button1Click(Sender: TObject); var http: HCkHttp; success: Boolean; attachmentId: PWideChar; messageId: PWideChar; url: PWideChar; outputFilePath: PWideChar; sbJson: HCkStringBuilder; json: HCkJsonObject; bd: HCkBinData; begin // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. http := CkHttp_Create(); CkHttp_putAuthToken(http,'ACCESS_TOKEN'); CkHttp_putAccept(http,'application/json'); // See the following example: Get GMail Message (format=full) // It shows how to download an email by message ID, and it shows how to parse the JSON // response which includes attachment names, ids, and other information. // This example will assume we already have the attachment id and filename. // This is the attachment ID for a file named "helloWorld.pdf". attachmentId := 'ANGjdJ-oy3aCuZISJKLAhUdaEksCEklbAPyMaWzFgqOMGbPCRkgwgeu_Kttd99C17OBTHROkDZGekibTKWXGfscB5ww7fw4E65_V1dQ-jHhb2TD1Cdm58-BbNw2iDxzptco8iILPiSnLLfFn5Ps7nsRcxHaGTt3r0yqFKCuIYNnPK1vM04BXI_cfzo-HnI4I3tD6oHNHOGVQrL01MdShFQjPELPUjXM8z1qs7Kom-QyvV1iOldUN-66UuhynsmDX-CMM5TIdB-8KD_lmdhf-0DqG8JnCA20XpXyfqwS8XFkPA-t-QSjb7SdkHQFtQ4lz2PcBREFzZ2eI5j0l0Y_dQHRPYTeMwkVl1yl4MfFT4C4iso3VSF-eqaIjiFCbXKCFNyeEIW5WFsv189dhlSqU'; messageId := '1712bc1dc22da2a2'; CkHttp_SetUrlVar(http,'messageId',messageId); CkHttp_SetUrlVar(http,'attachmentId',attachmentId); url := 'https://www.googleapis.com/gmail/v1/users/userId/messages/{$messageId}/attachments/{$attachmentId}'; // When we download, the response is JSON that contains the attachment data base64url encoded, like this: // { // "size": 934, // "data": "JVBERi0xLjM ... CiUlRU9GCg==" // } outputFilePath := 'qa_output/helloWorld.pdf'; // Download into a StringBuilder. sbJson := CkStringBuilder_Create(); success := CkHttp_DownloadSb(http,url,'utf-8',sbJson); if (success = False) then begin Memo1.Lines.Add(CkHttp__lastErrorText(http)); Exit; end; if (CkHttp_getLastStatus(http) <> 200) then begin // Something failed. // the JSON contains an error message. Memo1.Lines.Add(CkStringBuilder__getAsString(sbJson)); Exit; end; // Load into a Chilkat JSON object. json := CkJsonObject_Create(); success := CkJsonObject_LoadSb(json,sbJson); // Extract the base64url data into a BinData. bd := CkBinData_Create(); success := CkJsonObject_BytesOf(json,'data','base64url',bd); // Save the data to a file. success := CkBinData_WriteFile(bd,'qa_output/helloWorld.pdf'); Memo1.Lines.Add('Success.'); CkHttp_Dispose(http); CkStringBuilder_Dispose(sbJson); CkJsonObject_Dispose(json); CkBinData_Dispose(bd); end; |
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