为什么构造函数没有真正运行？ [英] How come a constructor not really being run?

问题描述

我在VC ++ 2012中的解决方案包括一些可执行程序&一些DLL。其中一个项目是DataReceiver，它输出的是一个程序dataReceiver.exe。一个DLL叫做DataInterface，其输出是DataInterface.dll。



在DataReceiver的主程序中，它通过类DataInput声明一个对象DataIn，它在DataInterface项目中定义。我插入了一些日志消息然后发现了奇怪的事情：DataIn的构造函数似乎被跳过了。细节描述如下：



DataReceiver主程序的片段如下：

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();
      ....................
    }

DataInput的构造函数以...开头：

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;
    ....................
}

DataInput的方法，Start（ ）从以下开始：

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

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

    ..........
}

成功构建它们后，我在MS命令提示符下运行'DataReceiver.exe'，我发现日志消息如下：

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()

很明显，在声明DataIn之后，DataIn.DataInput（）或DataIn.Start（）都没有已执行，为什么？



从日志消息中，DataIn的构造函数从未运行过。为什么？

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?

推荐答案

您的构造函数可能不是默认构造函数，而是调用默认构造函数。



我也同意你可能加载错误的二进制文件的答案。尝试在main所在的应用程序中实现DataIn，它应该可以工作。

There is a chance that your constructor is not default one and default is called.

I also agree with the answer that you might load wrong binary file. Try to implement DataIn inside your application where main is located, it should work.

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