PeekMessage(&msg,NULL,0,0,PM_NOREMOVE); AfxGetApp()->PumpMes

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PeekMessage(&msg,NULL,0,0,PM_NOREMOVE); AfxGetApp()->PumpMessage();
有PumpMessage()函数详细说明吗?请告知.
PeekMessage(&msg,NULL,0,0,PM_NOREMOVE);
AfxGetApp()->PumpMessage();

第一句：从消息队列中取出一个消息存到msg结构里,这个消息不会在队列里删除（PM_NOREMOVE决定）；
第二句：当前应用程序的全局对象app强制消息处理之.
====下面从MSDN拷贝的PumpMessage函数介绍===
PumpMessage contains the thread's message loop. PumpMessage is called by CWinThread to pump the thread's messages. You can call PumpMessage directly to force messages to be processed, or you can override PumpMessage to change its default behavior.
Calling PumpMessage directly and overriding its default behavior is recommended for advanced users only.

汇编中 MSG DB 'Welcome',0DH,0AH CNT EQU $ - MSG 其中的 $ - MSG cnt 判断空指针的0与null NULL与0有区别吗 C语言中‘\0’和NULL是等价的吗? android程序里Message的内容是什么,我print(msg)会得到（what=7 when=0）,其中what p是个指针,如果定义p=NULL,那么p->weight是0还是NULL,p->next又是什么?下面是我定义的结构体 m_MSComm.Create(NULL,style,CRect(0,0,0,0),this,IDC_MSCOMM);, '/0',0,0x0000,NULL这四个有什么区别?特别是在C语言中! C语言中EOF NULL \0 和'\0'中哪些值为零 b=(double*)calloc(m,sizeof(double)); if (b==NULL) return(0); while( *want ='\0'){ if( *str++ = *want++) return NULL; retu list=null与list.size()=0有什么区别?