刚开始学VC，想按照别人编的代码自己操作一下。在按钮的事件里添加了下面语句：
void CCh33891Dlg::Button1()
{
    CString strNewPort;
    m_IDC_3389_NEW.GetWindowText(strNewPort);
    if(strNewPort.IsEmpty() || strNewPort==_T(""))
    {
        AfxMessageBox("请填写新端口");
        m_IDC_3389_NEW.SetFocus();
        return;
    }
...
}
怎么人家的源码可以正常运行。我的确出现了一堆错误：请教懂得朋友们，这是什么错误呢，应该怎么修改？谢谢大家！
E:\C++test\Ch33891\Ch33891Dlg.cpp(150) : error C2065: 'm_IDC_3389_OLD' : undeclared identifier
E:\C++test\Ch33891\Ch33891Dlg.cpp(150) : error C2228: left of '.SetWindowTextA' must have class/struct/union type
E:\C++test\Ch33891\Ch33891Dlg.cpp(153) : error C2228: left of '.SetWindowTextA' must have class/struct/union type
E:\C++test\Ch33891\Ch33891Dlg.cpp(156) : error C2228: left of '.SetWindowTextA' must have class/struct/union type
E:\C++test\Ch33891\Ch33891Dlg.cpp(158) : error C2065: 'IDC_3389_NEW' : undeclared identifier
E:\C++test\Ch33891\Ch33891Dlg.cpp(158) : error C2227: left of '->EnableWindow' must point to class/struct/union
E:\C++test\Ch33891\Ch33891Dlg.cpp(226) : error C2065: 'm_IDC_3389_NEW' : undeclared identifier
E:\C++test\Ch33891\Ch33891Dlg.cpp(226) : error C2228: left of '.GetWindowTextA' must have class/struct/union type
E:\C++test\Ch33891\Ch33891Dlg.cpp(230) : error C2228: left of '.SetFocus' must have class/struct/union type