HINSTANCE是应用程序实例句柄，
HWND是窗口对象句柄，
HANDLE是任意对象的句柄，
CWnd是MFC中的窗口类。
MSDN里面对于HINSTANCE的解释是"handle to an instance" 就是说是一个instance的句柄。而对instance的解释是"An object for which memory is allocated or which is persistent." 占有内存的一个对象。
对于HWND的解释是“Handle to a window.”而对window的解释是"In a graphical Windows-based application, a window is a rectangular area of the screen where the application displays output and receives input from the user. Therefore, one of the first tasks of a graphical Windows-based application is to create a window. " 就是说是屏幕上的一块区域。
CWnd是MFC的一个类了，它有窗体，几乎所有有图形显示的类都是从它派生的，它自己是从CCmdTarget类派生的，所以它可以接受消息。CCmdTarget类的爸爸可就是CObject了。
msdn对于Handle的解释是"Handle to an object." ,简直是废话。自己怎么解释自己呢。可是好像也只能如此了。我感觉句柄就可以理解为控制对象的一个…………东西吧。
------------------------------------------------------------------------------
ID--HANDLE--HWND三者之间的互相转换
ID--HANDLE--HWND三者之间的互相转换
id->句柄-----------hWnd = ::GetDlgItem(hParentWnd,id);
id->指针-----------CWnd::GetDlgItem();
句柄->id-----------id = GetWindowLong(hWnd,GWL_ID);
句柄->指针--------CWnd *pWnd=CWnd::FromHandle(hWnd);
指针->ID----------id = GetWindowLong(pWnd->GetSafeHwnd,GWL_ID);
GetDlgCtrlID();
指针->句柄--------hWnd=cWnd.GetSafeHandle() or mywnd->m_hWnd;
-------------------------------------------------------------------------------
应用程序的一些HANDLE
// 得到窗口句柄
HWDN parenthwnd = ::FindWindowEx(NULL, parenthwnd, "#32770", NULL);
// 得到此窗口的主线程ID
DWORD dwThreadId = ::GetWindowThreadProcessId(parenthwnd, 0);
// 得到当前进程的句柄
HANDLE hApp = GetModuleHandle(NULL);
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