Delphi ActiveX GMail: Get a specific message (format="full")

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Gets a specific message using format=full.

Documentation: https://developers.google.com/gmail/api/v1/reference/users/messages/get


var
rest: TChilkatRest;
success: Integer;
oauth2: TChilkatOAuth2;
sbJson: TChilkatStringBuilder;
json: TChilkatJsonObject;
id: WideString;
threadId: WideString;
snippet: WideString;
historyId: WideString;
internalDate: WideString;
payloadPartId: WideString;
payloadMimeType: WideString;
payloadFilename: WideString;
payloadBodySize: Integer;
sizeEstimate: Integer;
i: Integer;
count_i: Integer;
strVal: WideString;
name: WideString;
value: WideString;
partId: WideString;
mimeType: WideString;
filename: WideString;
bodySize: Integer;
bodyAttachmentId: WideString;
j: Integer;
count_j: Integer;
k: Integer;
count_k: Integer;
bodyData: WideString;
i1: Integer;
count_i1: Integer;
json1: IChilkatJsonObject;

begin
rest := TChilkatRest.Create(Self);

//   Provide a previously obtained OAuth2 access token.
oauth2 := TChilkatOAuth2.Create(Self);
oauth2.AccessToken := 'OAUTH2_ACCESS_TOKEN';
rest.SetAuthOAuth2(oauth2.ControlInterface);

success := rest.Connect('www.googleapis.com',443,1,1);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

rest.AddPathParam('messageId','15fc23688c553739');

rest.AddQueryParam('format','full');

sbJson := TChilkatStringBuilder.Create(Self);
success := rest.FullRequestNoBodySb('GET','/gmail/v1/users/me/messages/messageId',sbJson.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

if (rest.ResponseStatusCode <> 200) then
  begin
    Memo1.Lines.Add('Received error response code: ' + IntToStr(rest.ResponseStatusCode));
    Memo1.Lines.Add('Response body:');
    Memo1.Lines.Add(sbJson.GetAsString());
    Exit;
  end;

json := TChilkatJsonObject.Create(Self);
json.LoadSb(sbJson.ControlInterface);

//  The following code parses the JSON response.
//  A sample JSON response is shown below the sample code.

id := json.StringOf('id');
threadId := json.StringOf('threadId');
snippet := json.StringOf('snippet');
historyId := json.StringOf('historyId');
internalDate := json.StringOf('internalDate');
payloadPartId := json.StringOf('payload.partId');
payloadMimeType := json.StringOf('payload.mimeType');
payloadFilename := json.StringOf('payload.filename');
payloadBodySize := json.IntOf('payload.body.size');
sizeEstimate := json.IntOf('sizeEstimate');
i := 0;
count_i := json.SizeOfArray('labelIds');
while i < count_i do
  begin
    json.I := i;
    strVal := json.StringOf('labelIds[i]');
    i := i + 1;
  end;

i := 0;
count_i := json.SizeOfArray('payload.headers');
while i < count_i do
  begin
    json.I := i;
    name := json.StringOf('payload.headers[i].name');
    value := json.StringOf('payload.headers[i].value');
    i := i + 1;
  end;

i := 0;
count_i := json.SizeOfArray('payload.parts');
while i < count_i do
  begin
    json.I := i;
    partId := json.StringOf('payload.parts[i].partId');
    mimeType := json.StringOf('payload.parts[i].mimeType');
    filename := json.StringOf('payload.parts[i].filename');
    bodySize := json.IntOf('payload.parts[i].body.size');
    bodyAttachmentId := json.StringOf('payload.parts[i].body.attachmentId');
    j := 0;
    count_j := json.SizeOfArray('payload.parts[i].headers');
    while j < count_j do
      begin
        json.J := j;
        name := json.StringOf('payload.parts[i].headers[j].name');
        value := json.StringOf('payload.parts[i].headers[j].value');
        j := j + 1;
      end;

    j := 0;
    count_j := json.SizeOfArray('payload.parts[i].parts');
    while j < count_j do
      begin
        json.J := j;
        partId := json.StringOf('payload.parts[i].parts[j].partId');
        mimeType := json.StringOf('payload.parts[i].parts[j].mimeType');
        filename := json.StringOf('payload.parts[i].parts[j].filename');
        bodySize := json.IntOf('payload.parts[i].parts[j].body.size');
        bodyAttachmentId := json.StringOf('payload.parts[i].parts[j].body.attachmentId');
        k := 0;
        count_k := json.SizeOfArray('payload.parts[i].parts[j].headers');
        while k < count_k do
          begin
            json.K := k;
            name := json.StringOf('payload.parts[i].parts[j].headers[k].name');
            value := json.StringOf('payload.parts[i].parts[j].headers[k].value');
            k := k + 1;
          end;

        k := 0;
        count_k := json.SizeOfArray('payload.parts[i].parts[j].parts');
        while k < count_k do
          begin
            json.K := k;
            partId := json.StringOf('payload.parts[i].parts[j].parts[k].partId');
            mimeType := json.StringOf('payload.parts[i].parts[j].parts[k].mimeType');
            filename := json.StringOf('payload.parts[i].parts[j].parts[k].filename');
            bodySize := json.IntOf('payload.parts[i].parts[j].parts[k].body.size');
            bodyData := json.StringOf('payload.parts[i].parts[j].parts[k].body.data');

            json1 := json.ObjectOf('payload.parts[i].parts[j].parts[k]');
            i1 := 0;
            count_i1 := json1.SizeOfArray('headers');
            while i1 < count_i1 do
              begin
                json1.I := i1;
                name := json1.StringOf('headers[i].name');
                value := json1.StringOf('headers[i].value');
                i1 := i1 + 1;
              end;

            k := k + 1;
          end;

        j := j + 1;
      end;

    i := i + 1;
  end;

Memo1.Lines.Add('Example Completed.');

Sample JSON Response Body

{
  "id": "15fc23688c553739",
  "threadId": "15fc23688c553739",
  "labelIds": [
    "IMPORTANT",
    "SENT",
    "INBOX"
  ],
  "snippet": "This is a test. \u200b",
  "historyId": "1438",
  "internalDate": "1510791874000",
  "payload": {
    "partId": "",
    "mimeType": "multipart/mixed",
    "filename": "",
    "headers": [
      {
        "name": "MIME-Version",
        "value": "1.0"
      },
      {
        "name": "Received",
        "value": "by 10.25.23.105 with HTTP; Wed, 15 Nov 2017 16:24:34 -0800 (PST)"
      },
      {
        "name": "X-Originating-IP",
        "value": "[2601:249:e00:9093:e894:b27f:e5d6:d01d]"
      },
      {
        "name": "Date",
        "value": "Wed, 15 Nov 2017 18:24:34 -0600"
      },
      {
        "name": "Delivered-To",
        "value": "matt@chilkat.io"
      },
      {
        "name": "Message-ID",
        "value": "\u003cCAPhjyBM1qqXS6NVB65W8Zt5-McF03qWSRDjW5am66wTMuard=w@mail.gmail.com\u003e"
      },
      {
        "name": "Subject",
        "value": "Test HTML email with image and attachment."
      },
      {
        "name": "From",
        "value": "Matt Fausey \u003cmatt@chilkat.io\u003e"
      },
      {
        "name": "To",
        "value": "Matt Fausey \u003cmatt@chilkat.io\u003e"
      },
      {
        "name": "Content-Type",
        "value": "multipart/mixed; boundary=\"001a11401a6c097887055e0ea572\""
      }
    ],
    "body": {
      "size": 0
    },
    "parts": [
      {
        "partId": "0",
        "mimeType": "multipart/related",
        "filename": "",
        "headers": [
          {
            "name": "Content-Type",
            "value": "multipart/related; boundary=\"001a11401a6c097885055e0ea571\""
          }
        ],
        "body": {
          "size": 0
        },
        "parts": [
          {
            "partId": "0.0",
            "mimeType": "multipart/alternative",
            "filename": "",
            "headers": [
              {
                "name": "Content-Type",
                "value": "multipart/alternative; boundary=\"001a11401a6c097882055e0ea570\""
              }
            ],
            "body": {
              "size": 0
            },
            "parts": [
              {
                "partId": "0.0.0",
                "mimeType": "text/plain",
                "filename": "",
                "headers": [
                  {
                    "name": "Content-Type",
                    "value": "text/plain; charset=\"UTF-8\""
                  },
                  {
                    "name": "Content-Transfer-Encoding",
                    "value": "quoted-printable"
                  }
                ],
                "body": {
                  "size": 22,
                  "data": "VGhpcyBpcyBhIHRlc3QuDQrigIsNCg=="
                }
              },
              {
                "partId": "0.0.1",
                "mimeType": "text/html",
                "filename": "",
                "headers": [
                  {
                    "name": "Content-Type",
                    "value": "text/html; charset=\"UTF-8\""
                  },
                  {
                    "name": "Content-Transfer-Encoding",
                    "value": "quoted-printable"
                  }
                ],
                "body": {
                  "size": 115,
                  "data": "PGRpdiBkaXI9Imx0ciI-VGhpcyBpcyBhIHRlc3QuPGltZyB3aWR0aD0iMTIwIiBoZWlnaHQ9IjEyMCIgc3JjPSJjaWQ6aWlfamExcWY5MGwwXzE1ZmMyMzUzOWJkMDA3MjciPjxicj7igIs8L2Rpdj4NCg=="
                }
              }
            ]
          },
          {
            "partId": "0.1",
            "mimeType": "image/jpeg",
            "filename": "starfish.jpg",
            "headers": [
              {
                "name": "Content-Type",
                "value": "image/jpeg; name=\"starfish.jpg\""
              },
              {
                "name": "Content-Disposition",
                "value": "inline; filename=\"starfish.jpg\""
              },
              {
                "name": "Content-Transfer-Encoding",
                "value": "base64"
              },
              {
                "name": "Content-ID",
                "value": "\u003cii_ja1qf90l0_15fc23539bd00727\u003e"
              },
              {
                "name": "X-Attachment-Id",
                "value": "ii_ja1qf90l0_15fc23539bd00727"
              },
              {
                "name": "MIME-Version",
                "value": "1.0"
              },
              {
                "name": "Date",
                "value": "Wed, 15 Nov 2017 16:23:08 -0800"
              },
              {
                "name": "Message-ID",
                "value": "\u003cCAPhjyBMicJ9k-EXY5Efcvp8o_z_J3x8_G=mnC_znLXnyBogemQ@mail.gmail.com\u003e"
              },
              {
                "name": "Subject",
                "value": "Attachment"
              },
              {
                "name": "From",
                "value": "Matt Fausey \u003cmatt@chilkat.io\u003e"
              }
            ],
            "body": {
              "attachmentId": "ANGjdJ_ueuzzM9bpQ8l_tD27oDfn-smCe77viIAF1wy8ZeI09tK5vAuSS6V9Bahow4ikqaGleXqdQBeq8xhFkJ7WN-KKBSKvOfT2yD-XMlA1FC8AOKS2A8tBi5dDDbFrbnns33rfqEIRFAISslhdE481uB6sYfVoYjpuDThtW6Y96YA0Aso0P9txbKJwcwOeD0RxDav_vPzDjHuRuOYsGxbVTxesMB2eiMMw3i1y-WAu-pyWHqF0xMFehZmd7d-krKKdvI4UEgtzD9siXnnaH6MG55ykjBsjFRsmjKc-4K5fHeYHOf586Pkej5K238A",
              "size": 6229
            }
          }
        ]
      },
      {
        "partId": "1",
        "mimeType": "application/pdf",
        "filename": "helloWorld.pdf",
        "headers": [
          {
            "name": "Content-Type",
            "value": "application/pdf; name=\"helloWorld.pdf\""
          },
          {
            "name": "Content-Disposition",
            "value": "attachment; filename=\"helloWorld.pdf\""
          },
          {
            "name": "Content-Transfer-Encoding",
            "value": "base64"
          },
          {
            "name": "X-Attachment-Id",
            "value": "f_ja1qgya31"
          }
        ],
        "body": {
          "attachmentId": "ANGjdJ934ScA-kvdsvBvOjO9z-RYmRLyO8PvqOCzwkk-smeLVpKqeoxXNIn9FL_RbzA6qmTWKQTJehrBVmX4NqYtFsivmwRfzIWj-A-SqvJATRhjEGOntUeBS0fPZ9xy_enmH5Qgi0iSdBmwAn1CBnNghEKdMjvxTMjLxqn2mSO4gvxIh8ahJZDMN1p8KMYO98dM2XfyNndltnK-sd_DizNR9BQu10w5WSTLeFfOh61SxGKeq4Dt3W5USQlx7dEG7dRiBDvjFM6wo2HVeSnGEVphOwx80t1MQdhRN-YOHCAahIqy7Z0-BkPIIjTeUtl_pST8oMi0IgJoo9x1oomY3JZp2OxWuNyOVWDGVsDavGHc6wRhwK5pJrDceCWxNdPEwExeYA84WOAFXE2D6I3m",
          "size": 934
        }
      }
    ]
  },
  "sizeEstimate": 11716
}