怎么样剖析MFC程序框架？
MFC程序框架剖析
作者:（ECNU）孟庆涛 Email:
1:程序的“导火索”---theApp
CjjjApp theApp;
在声明对象的同时，调用其构造函数。按C++的语法，首先要调用其基类Cwinapp的构造函数. 这个文件主要用于应用程序的一些初始化操作。
class CWinApp : public CWinThread
{
DECLARE_DYNAMIC(CWinApp)
public:
// Constructor
CWinApp(LPCTSTR lpszAppName = NULL);
…………
}
CWinApp::CWinApp(LPCTSTR lpszAppName)
{
if (lpszAppName != NULL)
m_pszAppName = _tcsdup(lpszAppName);
else
m_pszAppName = NULL;
// initialize CWinThread state
AFX_MODULE_STATE* pModuleState = _AFX_CMDTARGET_GETSTATE();
AFX_MODULE_THREAD_STATE* pThreadState = pModuleState->m_thread;
ASSERT(AfxGetThread() == NULL);
pThreadState->m_pCurrentWinThread = this;
ASSERT(AfxGetThread() == this);
m_hThread = ::GetCurrentThread();
m_nThreadID = ::GetCurrentThreadId();
// initialize CWinApp state
ASSERT(afxCurrentWinApp == NULL); // only one CWinApp object please
pModuleState->m_pCurrentWinApp = this;
ASSERT(AfxGetApp() == this);
// in non-running state until WinMain
m_hInstance = NULL;
m_hLangResourceDLL = NULL;
m_pszHelpFilePath = NULL;
m_pszProfileName = NULL;
m_pszRegistryKey = NULL;
m_pszExeName = NULL;
m_pRecentFileList = NULL;
m_pDocManager = NULL;
m_atomApp = m_atomSystemTopic = NULL;
m_lpCmdLine = NULL;
m_pCmdInfo = NULL;
// initialize wait cursor state
m_nWaitCursorCount = 0;
m_hcurWaitCursorRestore = NULL;
// initialize current printer state
m_hDevMode = NULL;
m_hDevNames = NULL;
m_nNumPreviewPages = 0; // not specified (defaults to 1)
// initialize DAO state
m_lpfnDaoTerm = NULL; // will be set if AfxDaoInit called
// other initialization
m_bHelpMode = FALSE;
m_eHelpType = afxWinHelp;
m_nSafetyPoolSize = 512; // default size
}
2:theApp之后的隐藏代码，由他控制整个程序的流程。
_tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPTSTR lpCmdLine, int nCmdShow)
{
// call shared/exported WinMain
return AfxWinMain(hInstance, hPrevInstance, lpCmdLine, nCmdShow);
}
其中有宏定义：#define _tWinMain wWinMain
int AFXAPI AfxWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPTSTR lpCmdLine, int nCmdShow)
{
ASSERT(hPrevInstance == NULL);
int nReturnCode = -1;
CWinThread* pThread = AfxGetThread();；// CWinApp是从CWinThread派生的，
CWinApp* pApp = AfxGetApp(); //实质上就是pThread==pApp
// AFX internal initialization
if (!AfxWinInit(hInstance, hPrevInstance, lpCmdLine, nCmdShow)) //用于初始化
goto InitFailure;
// App global initializations (rare)
if (pApp != NULL && !pApp->InitApplication()) //用于初始化
goto InitFailure;
// Perform specific initializations
if (!pThread->InitInstance()) //注意多态性 virtual BOOL InitInstance();
//又因为pThread==pApp，所以调用pApp-> InitInstance()
{
if (pThread->m_pMainWnd != NULL)
{
TRACE(traceAppMsg, 0, "Warning: Destroying non-NULL m_pMainWnd/n");
pThread->m_pMainWnd->DestroyWindow();
}
nReturnCode = pThread->ExitInstance();
goto InitFailure;
}
nReturnCode = pThread->Run(); //控制消息循环
InitFailure:
#ifdef _DEBUG
// Check for missing AfxLockTempMap calls
if (AfxGetModuleThreadState()->m_nTempMapLock != 0)
{
TRACE(traceAppMsg, 0, "Warning: Temp map lock count non-zero (%ld)./n",
AfxGetModuleThreadState()->m_nTempMapLock);
}
AfxLockTempMaps();
AfxUnlockTempMaps(-1);
#endif
AfxWinTerm();
return nReturnCode;
}
由上面的程序可以看到几个很重要的函数
（1）AfxWinInit(hInstance, hPrevInstance, lpCmdLine, nCmdShow))
goto InitFailure;
(2) pApp->InitApplication())
(3) pThread->InitInstance()
(4) pThread->Run()
其中1，2 也是完成程序的一些初始化工作，4 主要是为了处理消息，3呢，很关键，我们运行时看到的窗口就是从这里产生。下面一一介绍
3:程序自动产生的InitInstance()函数
以下是自动生成的InitInstance()源程序：
BOOL CjjjApp::InitInstance()
{
// 如果一个运行在 Windows XP 上的应用程序清单指定要
// 使用 ComCtl32.dll 版本 6 或更高版本来启用可视化方式，
//则需要 InitCommonControls()。否则，将无法创建窗口。
InitCommonControls();
CWinApp::InitInstance();
// 初始化 OLE 库
if (!AfxOleInit())
{
AfxMessageBox(IDP_OLE_INIT_FAILED);
return FALSE;
}
AfxEnableControlContainer();
// 标准初始化
// 如果未使用这些功能并希望减小
// 最终可执行文件的大小，则应移除下列
// 不需要的特定初始化例程
// 更改用于存储设置的注册表项
// TODO: 应适当修改该字符串，
// 例如修改为公司或组织名
SetRegistryKey(_T("应用程序向导生成的本地应用程序"));
LoadStdProfileSettings(4); // 加载标准 INI 文件选项(包括 MRU)
// 注册应用程序的文档模板。文档模板
// 将用作文档、框架窗口和视图之间的连接
CMultiDocTemplate* pDocTemplate;
pDocTemplate = new CMultiDocTemplate(IDR_jjjTYPE,
RUNTIME_CLASS(CjjjDoc),
RUNTIME_CLASS(CChildFrame), // 自定义 MDI 子框架
RUNTIME_CLASS(CjjjView));
if (!pDocTemplate)
return FALSE;
AddDocTemplate(pDocTemplate);
// 创建主 MDI 框架窗口
CMainFrame* pMainFrame = new CMainFrame;
if (!pMainFrame || !pMainFrame->LoadFrame(IDR_MAINFRAME))
return FALSE;
m_pMainWnd = pMainFrame;
// 仅当具有后缀时才调用 DragAcceptFiles
// 在 MDI 应用程序中，这应在设置 m_pMainWnd 之后立即发生
// 分析标准外壳命令、DDE、打开文件操作的命令行
CCommandLineInfo cmdInfo;
ParseCommandLine(cmdInfo);
// 调度在命令行中指定的命令。如果
// 用 /RegServer、/Register、/Unregserver 或 /Unregister 启动应用程序，则返回 FALSE。
if (!ProcessShellCommand(cmdInfo)) //引发窗口注册
return FALSE;
// 主窗口已初始化，因此显示它并对其进行更新
pMainFrame->ShowWindow(m_nCmdShow);
pMainFrame->UpdateWindow();
return TRUE;
}
其中，注册窗口用到了一下函数，比较长，如下：
BOOL AFXAPI AfxEndDeferRegisterClass(LONG fToRegister)
{
// mask off all classes that are already registered
AFX_MODULE_STATE* pModuleState = AfxGetModuleState();
fToRegister &= ~pModuleState->m_fRegisteredClasses;
if (fToRegister == 0)
return TRUE;
LONG fRegisteredClasses = 0;
// common initialization
WNDCLASS wndcls;
memset(&wndcls, 0, sizeof(WNDCLASS)); // start with NULL defaults
wndcls.lpfnWndProc = DefWindowProc; //窗口处理函数
wndcls.hInstance = AfxGetInstanceHandle();
wndcls.hCursor = afxData.hcurArrow;
INITCOMMONCONTROLSEX init;
init.dwSize = sizeof(init);
// work to register classes as specified by fToRegister, populate fRegisteredClasses as we go
if (fToRegister & AFX_WND_REG)
{
// Child windows - no brush, no icon, safest default class styles
wndcls.style = CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW;
wndcls.lpszClassName = _afxWnd;
if (AfxRegisterClass(&wndcls))
fRegisteredClasses |= AFX_WND_REG;
}
if (fToRegister & AFX_WNDOLECONTROL_REG)
{
// OLE Control windows - use parent DC for speed
wndcls.style |= CS_PARENTDC | CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW;
wndcls.lpszClassName = _afxWndOleControl;
if (AfxRegisterClass(&wndcls))
fRegisteredClasses |= AFX_WNDOLECONTROL_REG;
}
if (fToRegister & AFX_WNDCONTROLBAR_REG)
{
// Control bar windows
wndcls.style = 0; // control bars don't handle double click
wndcls.lpszClassName = _afxWndControlBar;
wndcls.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
if (AfxRegisterClass(&wndcls))
fRegisteredClasses |= AFX_WNDCONTROLBAR_REG;
}
if (fToRegister & AFX_WNDMDIFRAME_REG)
{
// MDI Frame window (also used for splitter window)
wndcls.style = CS_DBLCLKS;
wndcls.hbrBackground = NULL;
if (_AfxRegisterWithIcon(&wndcls, _afxWndMDIFrame, AFX_IDI_STD_MDIFRAME))
fRegisteredClasses |= AFX_WNDMDIFRAME_REG;
}
if (fToRegister & AFX_WNDFRAMEORVIEW_REG)
{
// SDI Frame or MDI Child windows or views - normal colors
wndcls.style = CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW;
wndcls.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1);
if (_AfxRegisterWithIcon(&wndcls, _afxWndFrameOrView, AFX_IDI_STD_FRAME))
fRegisteredClasses |= AFX_WNDFRAMEORVIEW_REG;
}
if (fToRegister & AFX_WNDCOMMCTLS_REG)
{
// this flag is compatible with the old InitCommonControls() API
init.dwICC = ICC_WIN95_CLASSES;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WIN95CTLS_MASK);
fToRegister &= ~AFX_WIN95CTLS_MASK;
}
if (fToRegister & AFX_WNDCOMMCTL_UPDOWN_REG)
{
init.dwICC = ICC_UPDOWN_CLASS;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WNDCOMMCTL_UPDOWN_REG);
}
if (fToRegister & AFX_WNDCOMMCTL_TREEVIEW_REG)
{
init.dwICC = ICC_TREEVIEW_CLASSES;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WNDCOMMCTL_TREEVIEW_REG);
}
if (fToRegister & AFX_WNDCOMMCTL_TAB_REG)
{
init.dwICC = ICC_TAB_CLASSES;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WNDCOMMCTL_TAB_REG);
}
if (fToRegister & AFX_WNDCOMMCTL_PROGRESS_REG)
{
init.dwICC = ICC_PROGRESS_CLASS;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WNDCOMMCTL_PROGRESS_REG);
}
if (fToRegister & AFX_WNDCOMMCTL_LISTVIEW_REG)
{
init.dwICC = ICC_LISTVIEW_CLASSES;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WNDCOMMCTL_LISTVIEW_REG);
}
if (fToRegister & AFX_WNDCOMMCTL_HOTKEY_REG)
{
init.dwICC = ICC_HOTKEY_CLASS;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WNDCOMMCTL_HOTKEY_REG);
}
if (fToRegister & AFX_WNDCOMMCTL_BAR_REG)
{
init.dwICC = ICC_BAR_CLASSES;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WNDCOMMCTL_BAR_REG);
}
if (fToRegister & AFX_WNDCOMMCTL_ANIMATE_REG)
{
init.dwICC = ICC_ANIMATE_CLASS;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WNDCOMMCTL_ANIMATE_REG);
}
if (fToRegister & AFX_WNDCOMMCTL_INTERNET_REG)
{
init.dwICC = ICC_INTERNET_CLASSES;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WNDCOMMCTL_INTERNET_REG);
}
if (fToRegister & AFX_WNDCOMMCTL_COOL_REG)
{
init.dwICC = ICC_COOL_CLASSES;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WNDCOMMCTL_COOL_REG);
}
if (fToRegister & AFX_WNDCOMMCTL_USEREX_REG)
{
init.dwICC = ICC_USEREX_CLASSES;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WNDCOMMCTL_USEREX_REG);
}
if (fToRegister & AFX_WNDCOMMCTL_DATE_REG)
{
init.dwICC = ICC_DATE_CLASSES;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WNDCOMMCTL_DATE_REG);
}
if (fToRegister & AFX_WNDCOMMCTL_LINK_REG)
{
init.dwICC = ICC_LINK_CLASS;
fRegisteredClasses |= _AfxInitCommonControls(&init, AFX_WNDCOMMCTL_LINK_REG);
}
// save new state of registered controls
pModuleState->m_fRegisteredClasses |= fRegisteredClasses;
// special case for all common controls registered, turn on AFX_WNDCOMMCTLS_REG
if ((pModuleState->m_fRegisteredClasses & AFX_WIN95CTLS_MASK) == AFX_WIN95CTLS_MASK)
{
pModuleState->m_fRegisteredClasses |= AFX_WNDCOMMCTLS_REG;
fRegisteredClasses |= AFX_WNDCOMMCTLS_REG;
}
// must have registered at least as mamy classes as requested
return (fToRegister & fRegisteredClasses) == fToRegister;
}
他是在PreCreateWindow中调用的注册，
BOOL CFrameWnd::PreCreateWindow(CREATESTRUCT& cs)
{
if (cs.lpszClass == NULL)
{
VERIFY(AfxDeferRegisterClass(AFX_WNDFRAMEORVIEW_REG));
cs.lpszClass = _afxWndFrameOrView; // COLOR_WINDOW background
}
if (cs.style & FWS_ADDTOTITLE)
cs.style |= FWS_PREFIXTITLE;
cs.dwExStyle |= WS_EX_CLIENTEDGE;
return TRUE;
}
BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
if( !CFrameWnd::PreCreateWindow(cs) )
return FALSE;
// TODO: Modify the Window class or styles here by modifying
// the CREATESTRUCT cs
return TRUE;
}
BOOL CView::PreCreateWindow(CREATESTRUCT & cs)
{
ASSERT(cs.style & WS_CHILD);
if (cs.lpszClass == NULL)
{
VERIFY(AfxDeferRegisterClass(AFX_WNDFRAMEORVIEW_REG));
cs.lpszClass = _afxWndFrameOrView; // COLOR_WINDOW background
}
if (cs.style & WS_BORDER)
{
cs.dwExStyle |= WS_EX_CLIENTEDGE;
cs.style &= ~WS_BORDER;
}
return TRUE;
}
BOOL CTestView::PreCreateWindow(CREATESTRUCT& cs)
{
// TODO: Modify the Window class or styles here by modifying
// the CREATESTRUCT cs
return CView::PreCreateWindow(cs);
}
有几点要说明
（1）m_pMainWnd，头文件里并没有这个变量呀？ 噢，这个在基类里定义的public 类型的变量，所以，他是通过继承得到的。
(2) 你注意过吗，当我们一点运行，会默认出来一个视图窗口，这是谁调用的呢？哦，就是下面这几行，它调用了opendocument() 函数。
CCommandLineInfo cmdInfo;
ParseCommandLine(cmdInfo);
if (!ProcessShellCommand(cmdInfo))
return FALSE；
（3）这个函数有个关键的地方
CMultiDocTemplate* pDocTemplate;
pDocTemplate = new CMultiDocTemplate(IDR_jjjTYPE,
RUNTIME_CLASS(CjjjDoc),
RUNTIME_CLASS(CChildFrame), // 自定义 MDI 子框架
RUNTIME_CLASS(CjjjView));
if (!pDocTemplate)
return FALSE;
AddDocTemplate(pDocTemplate);
通过它，把视图，窗口和文档结合起来。
4:主窗口CMainFrame的创建
(1)通过CMainFrame* pMainFrame = new CMainFrame;
我们得到的是不断调用的基类
CMainFrame::CMainFrame()
{
// TODO: 在此添加成员初始化代码
}
CMDIFrameWnd::CMDIFrameWnd()
{
m_hWndMDIClient = NULL;
}
CFrameWnd::CFrameWnd()
{
ASSERT(m_hWnd == NULL);
m_nWindow = -1; // unknown window ID
m_bAutoMenuEnable = TRUE; // auto enable on by default
m_lpfnCloseProc = NULL;
m_hMenuDefault = NULL;
m_hAccelTable = NULL;
m_nIDHelp = 0;
m_nIDTracking = 0;
m_nIDLastMessage = 0;
m_pViewActive = NULL;
m_cModalStack = 0; // initialize modality support
m_phWndDisable = NULL;
m_pNotifyHook = NULL;
m_hMenuAlt = NULL;
m_nIdleFlags = 0; // no idle work at start
m_rectBorder.SetRectEmpty();
m_bHelpMode = HELP_INACTIVE; // not in Shift+F1 help mode
m_dwPromptContext = 0;
m_pNextFrameWnd = NULL; // not in list yet
m_bInRecalcLayout = FALSE;
m_pFloatingFrameClass = NULL;
m_nShowDelay = -1; // no delay pending
AddFrameWnd();
}
(2)pMainFrame->LoadFrame(IDR_MAINFRAME)所引发的一系列
BOOL CMDIFrameWnd::LoadFrame(UINT nIDResource, DWORD dwDefaultStyle,
CWnd* pParentWnd, CCreateContext* pContext)
{
if (!CFrameWnd::LoadFrame(nIDResource, dwDefaultStyle,
pParentWnd, pContext))
return FALSE;
// save menu to use when no active MDI child window is present
ASSERT(m_hWnd != NULL);
m_hMenuDefault = ::GetMenu(m_hWnd);
if (m_hMenuDefault == NULL)
TRACE(traceAppMsg, 0, "Warning: CMDIFrameWnd without a default menu./n");
return TRUE;
}
BOOL CFrameWnd::LoadFrame(UINT nIDResource, DWORD dwDefaultStyle,
CWnd* pParentWnd, CCreateContext* pContext)
{
// only do this once
ASSERT_VALID_IDR(nIDResource);
ASSERT(m_nIDHelp == 0 || m_nIDHelp == nIDResource);
m_nIDHelp = nIDResource; // ID for help context (+HID_BASE_RESOURCE)
CString strFullString;
if (strFullString.LoadString(nIDResource))
AfxExtractSubString(m_strTitle, strFullString, 0); // first sub-string
VERIFY(AfxDeferRegisterClass(AFX_WNDFRAMEORVIEW_REG));
// attempt to create the window
LPCTSTR lpszClass = GetIconWndClass(dwDefaultStyle, nIDResource);
CString strTitle = m_strTitle;
if (!Create(lpszClass, strTitle, dwDefaultStyle, rectDefault,
pParentWnd, MAKEINTRESOURCE(nIDResource),
{
return FALSE; // will self destruct on failure normally
}
// save the default menu handle
ASSERT(m_hWnd != NULL);
m_hMenuDefault = ::GetMenu(m_hWnd);
// load accelerator resource
LoadAccelTable(MAKEINTRESOURCE(nIDResource));
if (pContext == NULL) // send initial update
SendMessageToDescendants(WM_INITIALUPDATE, 0, 0, TRUE, TRUE);
return TRUE;
}
BOOL CFrameWnd::Create(LPCTSTR lpszClassName,
LPCTSTR lpszWindowName,
DWORD dwStyle,
const RECT& rect,
CWnd* pParentWnd,
LPCTSTR lpszMenuName,
DWORD dwExStyle,
CCreateContext* pContext)
{
HMENU hMenu = NULL;
if (lpszMenuName != NULL)
{
// load in a menu that will get destroyed when window gets destroyed
HINSTANCE hInst = AfxFindResourceHandle(lpszMenuName, RT_MENU);
if ((hMenu = ::LoadMenu(hInst, lpszMenuName)) == NULL)
{
TRACE(traceAppMsg, 0, "Warning: failed to load menu for CFrameWnd./n");
PostNcDestroy(); // perhaps delete the C++ object
return FALSE;
}
}
m_strTitle = lpszWindowName; // save title for later
if (!CreateEx(dwExStyle, lpszClassName, lpszWindowName, dwStyle,
rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top,
pParentWnd->GetSafeHwnd(), hMenu, (LPVOID)pContext))
{
TRACE(traceAppMsg, 0, "Warning: failed to create CFrameWnd./n");
if (hMenu != NULL)
DestroyMenu(hMenu);
return FALSE;
}
return TRUE;
}
因为CFrameWnd没有重新写CreateEX,所以是调用的基类的CreateEx的函数：
BOOL CWnd::CreateEx(DWORD dwExStyle, LPCTSTR lpszClassName,
LPCTSTR lpszWindowName, DWORD dwStyle,
int x, int y, int nWidth, int nHeight,
HWND hWndParent, HMENU nIDorHMenu, LPVOID lpParam)
{
// allow modification of several common create parameters
CREATESTRUCT cs;
cs.dwExStyle = dwExStyle;
cs.lpszClass = lpszClassName;
cs.lpszName = lpszWindowName;
cs.style = dwStyle;
cs.x = x;
cs.y = y;
cs.cx = nWidth;
cs.cy = nHeight;
cs.hwndParent = hWndParent;
cs.hMenu = nIDorHMenu;
cs.hInstance = AfxGetInstanceHandle();
cs.lpCreateParams = lpParam;
if (!PreCreateWindow(cs))
{
PostNcDestroy();
return FALSE;
}
AfxHookWindowCreate(this);
HWND hWnd = ::CreateWindowEx(cs.dwExStyle, cs.lpszClass,
cs.lpszName, cs.style, cs.x, cs.y, cs.cx, cs.cy,
cs.hwndParent, cs.hMenu, cs.hInstance, cs.lpCreateParams);
#ifdef _DEBUG
if (hWnd == NULL)
{
TRACE(traceAppMsg, 0, "Warning: Window creation failed: GetLastError returns 0x%8.8X/n",
GetLastError());
}
#endif
if (!AfxUnhookWindowCreate())
PostNcDestroy(); // cleanup if CreateWindowEx fails too soon
if (hWnd == NULL)
return FALSE;
ASSERT(hWnd == m_hWnd); // should have been set in send msg hook
return TRUE;
}
可以看到，::CreateWindowEx是一个全局的函数，在其中触发WM_CREATE消息，进而调用我们自己定义的CMainFrame::OnCreate()
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CMDIFrameWnd::OnCreate(lpCreateStruct) == -1)
return -1;
if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP
| CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||
!m_wndToolBar.LoadToolBar(IDR_MAINFRAME))
{
TRACE0("未能创建工具栏/n");
return -1; // 未能创建
}
if (!m_wndStatusBar.Create(this) ||
!m_wndStatusBar.SetIndicators(indicators,
sizeof(indicators)/sizeof(UINT)))
{
TRACE0("未能创建状态栏/n");
return -1; // 未能创建
}
//TODO: 如果不需要工具栏可停靠，则删除这三行
m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY);
EnableDocking(CBRS_ALIGN_ANY);
DockControlBar(&m_wndToolBar);
return 0;
}
5:运行后为什么能产生CMainFarme，文档 ，视图以及视图外包围的farme呢？
你注意过吗，当我们一点运行，会默认出来一个视图窗口，这是谁调用的呢？哦，就是下面这几行，它调用void CWinApp::OnFileNew()函数.
CCommandLineInfo cmdInfo;
ParseCommandLine(cmdInfo);
if (!ProcessShellCommand(cmdInfo))
return FALSE；
你可以自己跟踪以下。这里有个小技巧，你可以在BOOL CjjjDoc::OnNewDocument()处设立断点，然后“跳出”，最后你会达到起始点!ProcessShellCommand(cmdInfo)
void CWinApp::OnFileNew()
{
if (m_pDocManager != NULL)
m_pDocManager->OnFileNew(); //接着调用下面的函数
}
void CDocManager::OnFileNew()
{
if (m_templateList.IsEmpty())
{
TRACE(traceAppMsg, 0, "Error: no document templates registered with CWinApp./n");
AfxMessageBox(AFX_IDP_FAILED_TO_CREATE_DOC);
return;
}
CDocTemplate* pTemplate = (CDocTemplate*)m_templateList.GetHead();
if (m_templateList.GetCount() > 1)
{
// more than one document template to choose from
// bring up dialog prompting user
CNewTypeDlg dlg(&m_templateList);
INT_PTR nID = dlg.DoModal();
if (nID == IDOK)
pTemplate = dlg.m_pSelectedTemplate;
else
return; // none - cancel operation
}
ASSERT(pTemplate != NULL);
ASSERT_KINDOF(CDocTemplate, pTemplate);
pTemplate->OpenDocumentFile(NULL); //接着调用下面的函数
// if returns NULL, the user has already been alerted
}
CDocument* CMultiDocTemplate::OpenDocumentFile(LPCTSTR lpszPathName,
BOOL bMakeVisible)
{
CDocument* pDocument = CreateNewDocument(); //产生模板控制之一：文档
if (pDocument == NULL)
{
TRACE(traceAppMsg, 0, "CDocTemplate::CreateNewDocument returned NULL./n");
AfxMessageBox(AFX_IDP_FAILED_TO_CREATE_DOC);
return NULL;
}
ASSERT_VALID(pDocument);
BOOL bAutoDelete = pDocument->m_bAutoDelete;
pDocument->m_bAutoDelete = FALSE; // don't destroy if something goes wrong
CFrameWnd* pFrame = CreateNewFrame(pDocument, NULL); //产生新的：框架
pDocument->m_bAutoDelete = bAutoDelete;
if (pFrame == NULL)
{
AfxMessageBox(AFX_IDP_FAILED_TO_CREATE_DOC);
delete pDocument; // explicit delete on error
return NULL;
}
ASSERT_VALID(pFrame);
if (lpszPathName == NULL)
{
// create a new document - with default document name
SetDefaultTitle(pDocument);
// avoid creating temporary compound file when starting up invisible
if (!bMakeVisible)
pDocument->m_bEmbedded = TRUE;
if (!pDocument->OnNewDocument())
{
// user has be alerted to what failed in OnNewDocument
TRACE(traceAppMsg, 0, "CDocument::OnNewDocument returned FALSE./n");
pFrame->DestroyWindow();
return NULL;
}
// it worked, now bump untitled count
m_nUntitledCount++;
}
else
{
// open an existing document
CWaitCursor wait;
if (!pDocument->OnOpenDocument(lpszPathName))
{
// user has be alerted to what failed in OnOpenDocument
TRACE(traceAppMsg, 0, "CDocument::OnOpenDocument returned FALSE./n");
pFrame->DestroyWindow();
return NULL;
}
pDocument->SetPathName(lpszPathName);
}
InitialUpdateFrame(pFrame, pDocument, bMakeVisible);
return pDocument;
}
我需要对上述函数进行进一步说明
(1)CreateNewDocument()产生文档
CDocument* CDocTemplate::CreateNewDocument()
{
// default implementation constructs one from CRuntimeClass
if (m_pDocClass == NULL)
{
TRACE(traceAppMsg, 0, "Error: you must override CDocTemplate::CreateNewDocument./n");
ASSERT(FALSE);
return NULL;
}
CDocument* pDocument = (CDocument*)m_pDocClass->CreateObject();
if (pDocument == NULL)
{
TRACE(traceAppMsg, 0, "Warning: Dynamic create of document type %hs failed./n",
m_pDocClass->m_lpszClassName);
return NULL;
}
ASSERT_KINDOF(CDocument, pDocument);
AddDocument(pDocument);
return pDocument;
}
(2)CreateNewFrame(pDocument, NULL)，产生框架和视图
CFrameWnd* CDocTemplate::CreateNewFrame(CDocument* pDoc, CFrameWnd* pOther)
{
if (pDoc != NULL)
ASSERT_VALID(pDoc);
// create a frame wired to the specified document
ASSERT(m_nIDResource != 0); // must have a resource ID to load from
CCreateContext context;
context.m_pCurrentFrame = pOther;
context.m_pCurrentDoc = pDoc;
context.m_pNewViewClass = m_pViewClass;
context.m_pNewDocTemplate = this;
if (m_pFrameClass == NULL)
{
TRACE(traceAppMsg, 0, "Error: you must override CDocTemplate::CreateNewFrame./n");
ASSERT(FALSE);
return NULL;
}
CFrameWnd* pFrame = (CFrameWnd*)m_pFrameClass->CreateObject();
if (pFrame == NULL)
{
TRACE(traceAppMsg, 0, "Warning: Dynamic create of frame %hs failed./n",
m_pFrameClass->m_lpszClassName);
return NULL;
}
ASSERT_KINDOF(CFrameWnd, pFrame);
if (context.m_pNewViewClass == NULL)
TRACE(traceAppMsg, 0, "Warning: creating frame with no default view./n");
// create new from resource
if (!pFrame->LoadFrame(m_nIDResource,
WS_OVERLAPPEDWINDOW | FWS_ADDTOTITLE, NULL, &context))
{
TRACE(traceAppMsg, 0, "Warning: CDocTemplate couldn't create a frame./n");
// frame will be deleted in PostNcDestroy cleanup
return NULL;
}
// it worked !
return pFrame;
}
在此函数中，不仅Frame被动态创建出来，其对应的窗口也以LoadFrame产生出来。其中参数context帮助产生了视图。别管怎么产生了，我跟踪不到，反正就是这个时候把框架和视图一起产生了出来。此时激发了WN_CREATE消息，从而引发CFrameWnd::OnCreate函数。我分别把相应的函数写在下面
CFrameWnd::OnCreate------CFrameWnd::OnCreateHelper------CFrameWnd:OnCreateClient-----CFrameWnd::CreateView*/
int CFrameWnd::OnCreate(LPCREATESTRUCT lpcs)
{
CCreateContext* pContext = (CCreateContext*)lpcs->lpCreateParams;
return OnCreateHelper(lpcs, pContext);
}
int CFrameWnd::OnCreateHelper(LPCREATESTRUCT lpcs, CCreateContext* pContext)
{
if (CWnd::OnCreate(lpcs) == -1)
return -1;
// create special children first
if (!OnCreateClient(lpcs, pContext))
{
TRACE(traceAppMsg, 0, "Failed to create client pane/view for frame./n");
return -1;
}
// post message for initial message string
PostMessage(WM_SETMESSAGESTRING, AFX_IDS_IDLEMESSAGE);
// make sure the child windows have been properly sized
RecalcLayout();
return 0; // create ok
}
BOOL CFrameWnd::OnCreateClient(LPCREATESTRUCT, CCreateContext* pContext)
{
// default create client will create a view if asked for it
if (pContext != NULL && pContext->m_pNewViewClass != NULL)
{
if (CreateView(pContext, AFX_IDW_PANE_FIRST) == NULL)
return FALSE;
}
return TRUE;
}
CWnd* CFrameWnd::CreateView(CCreateContext* pContext, UINT nID)
{
ASSERT(m_hWnd != NULL);
ASSERT(::IsWindow(m_hWnd));
ASSERT(pContext != NULL);
ASSERT(pContext->m_pNewViewClass != NULL);
// Note: can be a CWnd with PostNcDestroy self cleanup
CWnd* pView = (CWnd*)pContext->m_pNewViewClass->CreateObject();
if (pView == NULL)
{
TRACE(traceAppMsg, 0, "Warning: Dynamic create of view type %hs failed./n",
pContext->m_pNewViewClass->m_lpszClassName);
return NULL;
}
ASSERT_KINDOF(CWnd, pView);
// views are always created with a border!
if (!pView->Create(NULL, NULL, AFX_WS_DEFAULT_VIEW,
CRect(0,0,0,0), this, nID, pContext))
{
TRACE(traceAppMsg, 0, "Warning: could not create view for frame./n");
return NULL; // can't continue without a view
}
if (pView->GetExStyle() & WS_EX_CLIENTEDGE)
{
// remove the 3d style from the frame, since the view is
// providing it.
// make sure to recalc the non-client area
ModifyStyleEx(WS_EX_CLIENTEDGE, 0, SWP_FRAMECHANGED);
}
return pView;
}
6:窗口的现实和刷新（激发paint事件）
pMainFrame->ShowWindow(m_nCmdShow);
pMainFrame->UpdateWindow();
7:pThread->Run()
/*thrdcore.cpp文件*/
// main running routine until thread exits
int CWinThread::Run()
{
ASSERT_VALID(this);
_AFX_THREAD_STATE* pState = AfxGetThreadState();
// for tracking the idle time state
BOOL bIdle = TRUE;
LONG lIdleCount = 0;
// acquire and dispatch messages until a WM_QUIT message is received.
for (;;)
{
// phase1: check to see if we can do idle work
while (bIdle &&
!::PeekMessage(&(pState->m_msgCur), NULL, NULL, NULL, PM_NOREMOVE))
{
// call OnIdle while in bIdle state
if (!OnIdle(lIdleCount++))
bIdle = FALSE; // assume "no idle" state
}
// phase2: pump messages while available
do
{
// pump message, but quit on WM_QUIT
if (!PumpMessage())
return ExitInstance();
// reset "no idle" state after pumping "normal" message
//if (IsIdleMessage(&m_msgCur))
if (IsIdleMessage(&(pState->m_msgCur)))
{
bIdle = TRUE;
lIdleCount = 0;
}
} while (::PeekMessage(&(pState->m_msgCur), NULL, NULL, NULL, PM_NOREMOVE));
}
}
BOOL CWinThread::PumpMessage()
{
return AfxInternalPumpMessage();
}
BOOL AFXAPI AfxInternalPumpMessage()
{
_AFX_THREAD_STATE *pState = AfxGetThreadState();
if (!::GetMessage(&(pState->m_msgCur), NULL, NULL, NULL))
{
#ifdef _DEBUG
TRACE(traceAppMsg, 1, "CWinThread::PumpMessage - Received WM_QUIT./n");
pState->m_nDisablePumpCount++; // application must die
#endif
// Note: prevents calling message loop things in 'ExitInstance'
// will never be decremented
return FALSE;
}
#ifdef _DEBUG
if (pState->m_nDisablePumpCount != 0)
{
TRACE(traceAppMsg, 0, "Error: CWinThread::PumpMessage called when not permitted./n");
ASSERT(FALSE);
}
#endif
#ifdef _DEBUG
_AfxTraceMsg(_T("PumpMessage"), &(pState->m_msgCur));
#endif
// process this message
if (pState->m_msgCur.message != WM_KICKIDLE && !AfxPreTranslateMessage(&(pState->m_msgCur)))
{
::TranslateMessage(&(pState->m_msgCur));
::DispatchMessage(&(pState->m_msgCur));
}
return TRUE;
}
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