MFC消息雏形

，组织两个数组_messageEntries[ ]和_commandEntries[ ]，把程序中欲处理的消息以及消息处理例程的关联性建立起来：

// 消息与处理例程之对照表

struct MSGMAP_ENTRY _messageEntries[] =

{

WM_CREATE,         OnCreate,

WM_PAINT,          OnPaint,

WM_SIZE,           OnSize,

WM_COMMAND,        OnCommand,

WM_SETFOCUS,       OnSetFocus,

WM_CLOSE,          OnClose,

WM_DESTROY,        OnDestroy,

}；这是消息       这是消息处理例程

// Command-ID 与处理例程之对照表格

struct MSGMAP_ENTRY _commandEntries =

{

IDM_ABOUT,               OnAbout,

IDM_FILEOPEN,            OnFileOpen,

IDM_SAVEAS,              OnSaveAs,

};这是WM_COMMAND命令项   这是命令处理例程

于是窗口函数可以这么设计：

// 窗口函数

LRESULT CALLBACK WndProc(HWND hWnd,     UINT message,

WPARAM wParam, LPARAM lParam)

{

int i;

for(i=0; i < dim(_messageEntries); i++) {  // 消息对照表

if (message == _messageEntries[i].nMessage)

return((*_messageEntries[i].pfn)(hWnd,message,wParam,lParam))；

}

return(DefWindowProc(hWnd, message, wParam, lParam));

}

// OnCommand——专门处理WM_COMMAND

LONG OnCommand(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

{

int i;

for(i=0; i < dim(_commandEntries); i++) {  // 命令项目对照表

if (LOWORD(wParam) == _commandEntries[i].nMessage)

return((*_commandEntries[i].pfn)(hWnd, message, wParam, lParam));

}

return(DefWindowProc(hWnd, message, wParam, lParam));

}

//----------------------------------------------------------------------

LONG OnCreate(HWND hWnd, UINT wMsg, UINT wParam, LONG lParam)

{

...

}

//----------------------------------------------------------------------

LONG OnAbout(HWND hWnd, UINT wMsg, UINT wParam, LONG lParam)

{

`...

}

这么一来，WndProc和OnCommand永远不必改变，每有新要处理的消息，只要在_messageEntries[ ]和 _commandEntries[ ] 两个数组中加上新元素，并针对新消息撰写新的处理例程即可。