C++

Find a Label ID by Name

See more GMail REST API Examples

Lookup the ID of a GMail label by the label name. C++

#include <CkHttp.h>
#include <CkStringBuilder.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkHttp http;
    http.put_AuthToken("GMAIL-ACCESS-TOKEN");

    const char *userId = "me";
    http.SetUrlVar("userId",userId);

    const char *url = "https://www.googleapis.com/gmail/v1/users/{$userId}/labels";

    //  Get the list of GMail labels as JSON.
    CkStringBuilder sb;
    success = http.QuickGetSb(url,sb);
    if (success != true) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    CkJsonObject json;
    json.LoadSb(sb);
    json.put_EmitCompact(false);
    std::cout << json.emit() << "\r\n";

    if (http.get_LastStatus() != 200) {
        std::cout << "Failed." << "\r\n";
        return;
    }

    //  The JSON returned looks like this:
    //  {
    //    "labels": [
    //      {
    //        "id": "Label_5",
    //        "name": "QA",
    //        "messageListVisibility": "show",
    //        "labelListVisibility": "labelShow",
    //        "type": "user"
    //      },
    //      {
    //        "id": "Label_21",
    //        "name": "[Gmail]/testFolder",
    //        "type": "user"
    //      },
    //      {
    //        "id": "CATEGORY_PERSONAL",
    //        "name": "CATEGORY_PERSONAL",
    //        "type": "system"
    //      },
    //  	...

    //  The name of the label is generally known because it's what we visually see.
    //  The id is what we need to get.  Assuming the name is unique,
    //  find the JSON record having name=<desired name>
    //  For example...
    CkJsonObject *jRecord = json.FindRecord("labels","name","QA",false);
    if (json.get_LastMethodSuccess() == true) {
        std::cout << "The id of QA is: " << jRecord->stringOf("id") << "\r\n";
        delete jRecord;
    }

    jRecord = json.FindRecord("labels","name","[Gmail]/testFolder",false);
    if (json.get_LastMethodSuccess() == true) {
        std::cout << "The id of [Gmail]/testFolder is: " << jRecord->stringOf("id") << "\r\n";
        delete jRecord;
    }

    jRecord = json.FindRecord("labels","name","questions",false);
    if (json.get_LastMethodSuccess() == true) {
        std::cout << "The id of questions is: " << jRecord->stringOf("id") << "\r\n";
        delete jRecord;
    }

    //  Output:

    //  The id of QA is: Label_5
    //  The id of [Gmail]/testFolder is: Label_21
    //  The id of questions is: Label_43
    }