构造与析构 && static 问题

----记录一下，其中的痛只有经历的才知道。。。。

-------先总结

// 1.static 的成员一定要在main前定义；（放在全局空间上）

//2.（就算手动）del了空间但是static成员的空间没有释放；

//3.CSQLoginWnd* pwindow； 只是定义指向CSQLoginWnd空间大小的指针（大小还是4字节），如果不初始化，就来一句pwindow->XXX = XX;  那是肯定有问题的； 它指向的空间内没有XXX这个标志；[位于bbs段]

#include <iostream>

using namespace std;

typedef struct _tagStaticTextConfig

{

          _tagStaticTextConfig()

          {

                   Height = 0;

                   cout << "_tagStaticTextConfig constructor" << endl;

          }

          ~_tagStaticTextConfig()

          {

                   cout << "_tagStaticTextConfig destructor" << endl;

          }

           int Height;

}StaticTextConfig;

class CWinUtilityControl

{

public:

          CWinUtilityControl() {cout << "CWinUtilityControl constructor" << endl;  }

           virtual ~CWinUtilityControl(){ cout << "CWinUtilityControl destructor " << endl; }

           static int test;

};

class CSQLoginWnd :public CWinUtilityControl

{

public:

          CSQLoginWnd( void) {cout << "CSQLoginWnd contructor " << endl; };

           virtual ~CSQLoginWnd(void ){cout << "CSQLoginWnd destructor " << endl; }

           //bool create();

           static CSQLoginWnd* init();

protected:

           public:

           static StaticTextConfig* m_STChelp;  //STC:StaticTextConfig 

           static CSQLoginWnd* m_SharedSQLoginWnd;

};

  

#include <string>

#include <iostream>

#include <tchar.h>

#include "resource1.h"

CSQLoginWnd* CSQLoginWnd::init()

{

           if (!m_SharedSQLoginWnd)

          {

                   m_SharedSQLoginWnd = new CSQLoginWnd();

                   m_STChelp = new StaticTextConfig();

                   CSQLoginWnd::m_STChelp->Height = 100;

                    return m_SharedSQLoginWnd;

          }

           return m_SharedSQLoginWnd;

}

CSQLoginWnd* CSQLoginWnd::m_SharedSQLoginWnd = NULL;

StaticTextConfig* CSQLoginWnd::m_STChelp = NULL;

int main()

{

          //CSQLoginWnd::k = 0; error

          CSQLoginWnd* pwindow = CSQLoginWnd::init();

           delete pwindow;

           if (!CSQLoginWnd::m_SharedSQLoginWnd)

          {

                   cout << "shareSQLLoginWnd is Null" << endl;

          } else{

                   cout << CSQLoginWnd::m_STChelp->Height << endl; //数据还存在；

          }

          getchar();

          

           return 0;

}