(C++) List all Labels in the User's Mailbox
      
      List all Labels in the GMail User's Mailbox 
		
 
      #include <CkHttp.h>
#include <CkStringBuilder.h>
#include <CkJsonObject.h>
void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.
    bool success;
    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";
    http.put_SessionLogFilename("c:/temp/qa_output/sessionLog.txt");
    // 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;
    }
    }
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