Delphi DLL 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: HCkRest;
success: Boolean;
oauth2: HCkOAuth2;
sbJson: HCkStringBuilder;
json: HCkJsonObject;
id: PWideChar;
threadId: PWideChar;
snippet: PWideChar;
historyId: PWideChar;
internalDate: PWideChar;
payloadPartId: PWideChar;
payloadMimeType: PWideChar;
payloadFilename: PWideChar;
payloadBodySize: Integer;
sizeEstimate: Integer;
i: Integer;
count_i: Integer;
strVal: PWideChar;
name: PWideChar;
value: PWideChar;
partId: PWideChar;
mimeType: PWideChar;
filename: PWideChar;
bodySize: Integer;
bodyAttachmentId: PWideChar;
j: Integer;
count_j: Integer;
k: Integer;
count_k: Integer;
bodyData: PWideChar;
i1: Integer;
count_i1: Integer;
json1: HCkJsonObject;

begin
rest := CkRest_Create();

//   Provide a previously obtained OAuth2 access token.
oauth2 := CkOAuth2_Create();
CkOAuth2_putAccessToken(oauth2,'OAUTH2_ACCESS_TOKEN');
CkRest_SetAuthOAuth2(rest,oauth2);

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

CkRest_AddPathParam(rest,'messageId','15fc23688c553739');

CkRest_AddQueryParam(rest,'format','full');

sbJson := CkStringBuilder_Create();
success := CkRest_FullRequestNoBodySb(rest,'GET','/gmail/v1/users/me/messages/messageId',sbJson);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

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

json := CkJsonObject_Create();
CkJsonObject_LoadSb(json,sbJson);

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

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

i := 0;
count_i := CkJsonObject_SizeOfArray(json,'payload.headers');
while i < count_i do
  begin
CkJsonObject_putI(json,i);
    name := CkJsonObject__stringOf(json,'payload.headers[i].name');
    value := CkJsonObject__stringOf(json,'payload.headers[i].value');
    i := i + 1;
  end;

i := 0;
count_i := CkJsonObject_SizeOfArray(json,'payload.parts');
while i < count_i do
  begin
CkJsonObject_putI(json,i);
    partId := CkJsonObject__stringOf(json,'payload.parts[i].partId');
    mimeType := CkJsonObject__stringOf(json,'payload.parts[i].mimeType');
    filename := CkJsonObject__stringOf(json,'payload.parts[i].filename');
    bodySize := CkJsonObject_IntOf(json,'payload.parts[i].body.size');
    bodyAttachmentId := CkJsonObject__stringOf(json,'payload.parts[i].body.attachmentId');
    j := 0;
    count_j := CkJsonObject_SizeOfArray(json,'payload.parts[i].headers');
    while j < count_j do
      begin
CkJsonObject_putJ(json,j);
        name := CkJsonObject__stringOf(json,'payload.parts[i].headers[j].name');
        value := CkJsonObject__stringOf(json,'payload.parts[i].headers[j].value');
        j := j + 1;
      end;

    j := 0;
    count_j := CkJsonObject_SizeOfArray(json,'payload.parts[i].parts');
    while j < count_j do
      begin
CkJsonObject_putJ(json,j);
        partId := CkJsonObject__stringOf(json,'payload.parts[i].parts[j].partId');
        mimeType := CkJsonObject__stringOf(json,'payload.parts[i].parts[j].mimeType');
        filename := CkJsonObject__stringOf(json,'payload.parts[i].parts[j].filename');
        bodySize := CkJsonObject_IntOf(json,'payload.parts[i].parts[j].body.size');
        bodyAttachmentId := CkJsonObject__stringOf(json,'payload.parts[i].parts[j].body.attachmentId');
        k := 0;
        count_k := CkJsonObject_SizeOfArray(json,'payload.parts[i].parts[j].headers');
        while k < count_k do
          begin
CkJsonObject_putK(json,k);
            name := CkJsonObject__stringOf(json,'payload.parts[i].parts[j].headers[k].name');
            value := CkJsonObject__stringOf(json,'payload.parts[i].parts[j].headers[k].value');
            k := k + 1;
          end;

        k := 0;
        count_k := CkJsonObject_SizeOfArray(json,'payload.parts[i].parts[j].parts');
        while k < count_k do
          begin
CkJsonObject_putK(json,k);
            partId := CkJsonObject__stringOf(json,'payload.parts[i].parts[j].parts[k].partId');
            mimeType := CkJsonObject__stringOf(json,'payload.parts[i].parts[j].parts[k].mimeType');
            filename := CkJsonObject__stringOf(json,'payload.parts[i].parts[j].parts[k].filename');
            bodySize := CkJsonObject_IntOf(json,'payload.parts[i].parts[j].parts[k].body.size');
            bodyData := CkJsonObject__stringOf(json,'payload.parts[i].parts[j].parts[k].body.data');

            json1 := CkJsonObject_ObjectOf(json,'payload.parts[i].parts[j].parts[k]');
            i1 := 0;
            count_i1 := CkJsonObject_SizeOfArray(json1,'headers');
            while i1 < count_i1 do
              begin
CkJsonObject_putI(json1,i1);
                name := CkJsonObject__stringOf(json1,'headers[i].name');
                value := CkJsonObject__stringOf(json1,'headers[i].value');
                i1 := i1 + 1;
              end;

            CkJsonObject_Dispose(json1);
            k := k + 1;
          end;

        j := j + 1;
      end;

    i := i + 1;
  end;

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

CkRest_Dispose(rest);
CkOAuth2_Dispose(oauth2);
CkStringBuilder_Dispose(sbJson);
CkJsonObject_Dispose(json);

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
}