How come a constructor not really being run?

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C++

VS2012

My solution in VC++2012 includes some executable programs & some DLLs. One of project is DataReceiver which output is a program, dataReceiver.exe. One DLL is called DataInterface, whose output is DataInterface.dll.

In main program of DataReceiver, it declares an object DataIn via class DataInput, which is defined at DataInterface project. I inserted some logging message and then found strange things happen: the DataIn's constructor seems being skipped. The detail is described as below:

The snippet of main program of DataReceiver is as below:

int main(int argc, char* argv[]) 
{
    boost::thread_group thGroup;
    boost::asio::io_service io_service;
    
    logMsg ("standebug: DataReceiver/main()\n");
    try 
    {
        logMsg ("standebug: DataReceiver/main():try\n");
        DataInput dataIn;
    
        cout << "K00.00.15.06.01\nNow:"<< boost::posix_time::to_iso_string(boost::posix_time::microsec_clock::local_time()) << endl;
        logMsg ("standebug: DataReceiver/main():to start()\n");
    
        dataIn.Start();
      ....................
    }

And the DataInput's constructor begins as:

DataInput::DataInput(void)
{
    m_mode = 0;

    logMsg ("standebug: DataInput::DataInput\n");
    cout << "standebug: DataInput::DataInput\n";
    m_OnChangedFn_ptr = NULL;
    ....................
}

The DataInput's method, Start() begins as:

void DataInput::Start(void)
{
    logMsg ("standebug: dataInput: Start\n");
    try
    {

    ..........
}

After building them successfully, I ran 'DataReceiver.exe' under MS Command Prompt, I found the logging message is as:

standebug: DataReceiver/main()
standebug: DataReceiver/main():try
standebug: DataReceiver/main():to start()

It's very obviously, after DataIn is declared, neither DataIn.DataInput() or DataIn.Start() had been executed, why?

From logging message, DataIn's constructor is never ran. How come?