Unicode C GMail: Search for Messages with Subject Containing a Word

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Return messages matching the specified query. See https://support.google.com/mail/answer/7190?hl=en for additional information about search operators. This example searches for all emails having the whole word "ADVChina" in the subject.

Documentation: https://support.google.com/mail/answer/7190?hl=en

CURL Command

curl -X GET https://www.googleapis.com/gmail/v1/users/me/messages?q=subject:ADVChina \
    --header "Authorization: Bearer GMAIL_TOKEN"

Unicode C Example

#include <C_CkRestW.h>
#include <C_CkStringBuilderW.h>
#include <C_CkJsonObjectW.h>

void ChilkatSample(void)
    {
    HCkRestW rest;
    BOOL success;
    BOOL bTls;
    int port;
    BOOL bAutoReconnect;
    HCkStringBuilderW sbResponseBody;
    int respStatusCode;
    HCkJsonObjectW jsonResponse;
    int i;
    int count_i;
    int resultSizeEstimate;
    const wchar_t *id;
    const wchar_t *threadId;

    rest = CkRestW_Create();

    //  URL: https://www.googleapis.com/gmail/v1/users/me/messages?q=subject:ADVChina
    bTls = TRUE;
    port = 443;
    bAutoReconnect = TRUE;
    success = CkRestW_Connect(rest,L"www.googleapis.com",port,bTls,bAutoReconnect);
    if (success != TRUE) {
        wprintf(L"ConnectFailReason: %d\n",CkRestW_getConnectFailReason(rest));
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        return;
    }

    CkRestW_AddHeader(rest,L"Authorization",L"Bearer GMAIL_TOKEN");

    sbResponseBody = CkStringBuilderW_Create();
    success = CkRestW_FullRequestNoBodySb(rest,L"GET",L"/gmail/v1/users/me/messages?q=subject:ADVChina",sbResponseBody);
    if (success != TRUE) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        CkStringBuilderW_Dispose(sbResponseBody);
        return;
    }

    respStatusCode = CkRestW_getResponseStatusCode(rest);
    if (respStatusCode >= 400) {
        wprintf(L"Response Status Code = %d\n",respStatusCode);
        wprintf(L"Response Header:\n");
        wprintf(L"%s\n",CkRestW_responseHeader(rest));
        wprintf(L"Response Body:\n");
        wprintf(L"%s\n",CkStringBuilderW_getAsString(sbResponseBody));
        CkRestW_Dispose(rest);
        CkStringBuilderW_Dispose(sbResponseBody);
        return;
    }

    jsonResponse = CkJsonObjectW_Create();
    CkJsonObjectW_LoadSb(jsonResponse,sbResponseBody);

    //  See the Online Tool for Generating JSON Parse Code

    resultSizeEstimate = CkJsonObjectW_IntOf(jsonResponse,L"resultSizeEstimate");
    i = 0;
    count_i = CkJsonObjectW_SizeOfArray(jsonResponse,L"messages");
    while (i < count_i) {
        CkJsonObjectW_putI(jsonResponse,i);
        id = CkJsonObjectW_stringOf(jsonResponse,L"messages[i].id");
        threadId = CkJsonObjectW_stringOf(jsonResponse,L"messages[i].threadId");
        i = i + 1;
    }



    CkRestW_Dispose(rest);
    CkStringBuilderW_Dispose(sbResponseBody);
    CkJsonObjectW_Dispose(jsonResponse);

    }

Sample JSON Response Body

{
  "messages": [
    {
      "id": "166e50fed0b9b0cb",
      "threadId": "166e50fed0b9b0cb"
    },
    {
      "id": "166c12e5fee013fe",
      "threadId": "166c12e5fee013fe"
    },
    {
      "id": "1669cc9a926bb8c1",
      "threadId": "1669cc9a926bb8c1"
    },
    {
      "id": "16678c485e7f0a0c",
      "threadId": "16678c485e7f0a0c"
    }
  ],
  "resultSizeEstimate": 4
}