mfc大观之四（串行保存）

    在mfc当中，保存其实是一件很简单的事情。你要做的很简单，第一步就是编写一个serial的虚函数，另外一步就是CArchive调用解决，整个过程非常简单和流畅。当然，为了判断class之间是否存在集成关系，它和之前的类一样也使用了runclass的方法，剩下的就是一些算术符号重载的trick了。大家有兴趣参考一下下面的代码，就明白其中的逻辑了。

#include <iostream>
using namespace std;

struct runclass {
  char name[64];
  struct runclass* next;

};

class cwrite {
public:
  cwrite() {
    cout << "cwrite::cwrite()" << endl;
  }
  ~cwrite() {
    cout << "cwrite::~cwrite()" << endl;
  }
};


#define CREATE_SERIAL(basic) \
  static runclass run_##basic; \
  static runclass* get_run_class() {return &run_##basic;} \
  friend cwrite& operator <<(cwrite& c, basic& b) {b.serial(c); return c;}

class cobject {

public:
  cobject() {
    cout << "cobject::cobject()" << endl;
  }

  virtual ~cobject() {
    cout << "cobject::~cobject()" << endl;
  }

  virtual void serial(cwrite& c) {
    cout << "cobject::serial()" << endl;
  }

public:
  CREATE_SERIAL(cobject)
};

runclass cobject::run_cobject = {"cobject", NULL};

#define IMPLEMENT_SERIAL(basic, origin) \
  runclass basic::run_##basic = {#basic, &origin::run_##origin}

class cwnd : public cobject {

public:
  cwnd(){
    cout << "cwnd::cwnd()" << endl;
  }

  ~cwnd() {
    cout << "cwnd::~cwnd()" << endl;
  }

  void serial(cwrite& c) {
    cout << "cwnd::serial()" << endl;
  }

public:
  CREATE_SERIAL(cwnd)
};

IMPLEMENT_SERIAL(cwnd, cobject);

bool
isKindOf(runclass* basic, runclass* origin){
  if(NULL == basic || NULL == origin)
    return false;

  while(basic->next)
    basic = basic->next;

  return 0 == strcmp(basic->name, origin->name) ? 1:0;
}

int
main(int argc, char* argv[]){

  cwrite c;
  cobject obj;
  cwnd wnd;
  c << obj;
  c << wnd;
  return 0;
}