Delphi DLL GMail: Lists the messages in the user's mailbox.

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Lists the messages in the user's mailbox.

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

var
rest: HCkRest;
success: Boolean;
oauth2: HCkOAuth2;
sbJson: HCkStringBuilder;
json: HCkJsonObject;
resultSizeEstimate: Integer;
i: Integer;
count_i: Integer;
id: PWideChar;
threadId: PWideChar;

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;

sbJson := CkStringBuilder_Create();
success := CkRest_FullRequestNoBodySb(rest,'GET','/gmail/v1/users/me/messages',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.

resultSizeEstimate := CkJsonObject_IntOf(json,'resultSizeEstimate');
i := 0;
count_i := CkJsonObject_SizeOfArray(json,'messages');
while i < count_i do
  begin
CkJsonObject_putI(json,i);
    id := CkJsonObject__stringOf(json,'messages[i].id');
    threadId := CkJsonObject__stringOf(json,'messages[i].threadId');
    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

{
  "messages": [
    {
      "id": "15fc237e79da4174",
      "threadId": "15fc237e79da4174"
    },
    {
      "id": "15fc23688c553739",
      "threadId": "15fc23688c553739"
    },
    {
      "id": "15fbd37d3a8f9950",
      "threadId": "15fbd37d3a8f9950"
    },
    {
      "id": "15fb5e49b822ac1d",
      "threadId": "15fb5e49b822ac1d"
    },
    {
      "id": "15fb5e49b7a0739b",
      "threadId": "15fb5e49b7a0739b"
    }
  ],
  "resultSizeEstimate": 5
}