Question

求高手帮忙详细解说下这代码吧。。小生是初学者。万分感谢了

// MainFrm.cpp : implementation of the CMainFrame class//
#include "stdafx.h"#include "SnowWorld.h"
#include "MainFrm.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////// CMainFrame
IMPLEMENT_DYNAMIC(CMainFrame, CFrameWnd)
BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
//{{AFX_MSG_MAP(CMainFrame)
// NOTE - the ClassWizard will add and remove mapping macros here.
// DO NOT EDIT what you see in these blocks of generated code !
ON_WM_CREATE()
ON_WM_SETFOCUS()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////// CMainFrame construction/destruction
CMainFrame::CMainFrame()
{
// TODO: add member initialization code here

}

CMainFrame::~CMainFrame()
{
}

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
return -1;
// create a view to occupy the client area of the frame
if (!m_wndView.Create(NULL, NULL, AFX_WS_DEFAULT_VIEW,
CRect(0, 0, 0, 0), this, AFX_IDW_PANE_FIRST, NULL))
{
TRACE0("Failed to create view window\n");
return -1;
}

return 0;}
BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
if ( cs.hMenu != NULL )
{
DestroyMenu( cs.hMenu );
cs.hMenu = NULL;
}

if( !CFrameWnd::PreCreateWindow(cs) )
return FALSE;
// TODO: Modify the Window class or styles here by modifying
// the CREATESTRUCT cs

cs.dwExStyle &= ~WS_EX_CLIENTEDGE;
cs.lpszClass = AfxRegisterWndClass(0);
return TRUE;
}

/////////////////////////////////////////////////////////////////////////////// CMainFrame diagnostics
#ifdef _DEBUG
void CMainFrame::AssertValid() const
{
CFrameWnd::AssertValid();
}

void CMainFrame::Dump(CDumpContext& dc) const
{
CFrameWnd::Dump(dc);
}

#endif //_DEBUG
/////////////////////////////////////////////////////////////////////////////
// CMainFrame message handlers
void CMainFrame::OnSetFocus(CWnd* pOldWnd)
{
UNREFERENCED_PARAMETER( pOldWnd );

// forward focus to the view window
m_wndView.SetFocus();
}

BOOL CMainFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo)
{
// let the view have first crack at the command
if (m_wndView.OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
return TRUE;

// otherwise, do default handling
return CFrameWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo);
}
我就是不太会但是又紧急需要。希望高手帮忙说说这到底讲的是什么。他的功能是什么。万分谢谢。十分急了。。。

Answer 1

IMPLEMENT_DYNAMIC(CMainFrame, CFrameWnd)
BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
//{{AFX_MSG_MAP(CMainFrame)
// NOTE - the ClassWizard will add and remove mapping macros here.
// DO NOT EDIT what you see in these blocks of generated code !
ON_WM_CREATE()
ON_WM_SETFOCUS()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
//消息映射，将相应的消息绑定相应的函数，类似于委托(c#中的)，函数指针

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
return -1;
// create a view to occupy the client area of the frame
if (!m_wndView.Create(NULL, NULL, AFX_WS_DEFAULT_VIEW,
CRect(0, 0, 0, 0), this, AFX_IDW_PANE_FIRST, NULL))
{
TRACE0("Failed to create view window\n");
return -1;
}
//创建视图，也就是view

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
if ( cs.hMenu != NULL )
{
DestroyMenu( cs.hMenu );
cs.hMenu = NULL;
}
//在窗口创建前做的一些初始化工作，如果菜单句柄不为空，就释放菜单句柄

void CMainFrame::AssertValid() const
{
CFrameWnd::AssertValid();
}

void CMainFrame::Dump(CDumpContext& dc) const
{
CFrameWnd::Dump(dc);
}
//上面两个函数是debug模式下的断言，不用管

void CMainFrame::OnSetFocus(CWnd* pOldWnd)
{
UNREFERENCED_PARAMETER( pOldWnd );
m_wndView.SetFocus();
}
//设置视图焦点

BOOL CMainFrame::OnCmdMs(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo)
{
if (m_wndView.OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
return TRUE;
return CFrameWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo);
}
//处理系统命令消息

Answer 2

最好把你不理解的地方标出来，有头绪的话好说，每行都解释不现实。如果确实从头到位都不明白在做什么，建议看下MFC的基础，