关于MFC内部结构实用的一点看法

　2007-03-15 21:46:34　来源：WEB开发网　　　

核心提示： theApp:全局变量或是类对象在程序运行前初始化，即分配内存空间，关于MFC内部结构实用的一点看法(2)，初始成员，（每一个MFC应用程序都只有一个全局对象theApp对象，还请多多见量，谢谢，我们用该全局对象唯一的表示该应用程序，）下面我们给出这些函数如何跟踪（我的是装在C：盘下的他们

theApp:全局变量或是类对象在程序运行前初始化。即分配内存空间，初始成员。（每一个MFC应用程序都只有一个全局对象theApp对象，我们用该全局对象唯一的表示该应用程序。）

下面我们给出这些函数如何跟踪（我的是装在C：盘下的他们都在。。MFCSRC下）

WinMain()函数（C:Program FilesMicrosoft Visual StudioVC98MFCSRCAPPMODUL.CPP）
WinApp(C:Program FilesMicrosoft Visual StudioVC98MFCSRCTHRDCORE.CPP)
AfxWinMain()(C:Program FilesMicrosoft Visual StudioVC98MFCSRCWINMAIN.CPP)
int AFXAPI AfxWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPTSTR lpCmdLine, int nCmdShow)
{
　ASSERT(hPrevInstance == NULL);
　int nReturnCode = -1;
　CWinThread* pThread = AfxGetThread();
　CWinApp* pApp = AfxGetApp();
　// AFX internal initialization
　if (!AfxWinInit(hInstance, hPrevInstance, lpCmdLine, nCmdShow))
　　goto InitFailure;
　// App global initializations (rare)
　if (pApp != NULL && !pApp->InitApplication()) // C:Program FilesMicrosoft Visual 　　StudioVC98MFCincludeAFXWIN.H)
　　goto InitFailure;
　// Perform specific initializations
　if (!pThread->InitInstance()) // C:Program FilesMicrosoft Visual StudioVC98MFCincludeAFXWIN.H)
　{
　　if (pThread->m_pMainWnd != NULL)
　　{
　　　TRACE0("Warning: Destroying non-NULL m_pMainWnd
");
　　　pThread->m_pMainWnd->DestroyWindow();
　　}
　　nReturnCode = pThread->ExitInstance();
　　goto InitFailure;
　}
　nReturnCode = pThread->Run();
　InitFailure:
　#ifdef _DEBUG
　// Check for missing AfxLockTempMap calls
　if (AfxGetModuleThreadState()->m_nTempMapLock != 0)
　{
　　TRACE1("Warning: Temp map lock count non-zero (%ld).
",
　　AfxGetModuleThreadState()->m_nTempMapLock);
　}
　AfxLockTempMaps();
　AfxUnlockTempMaps(-1);
　#endif
　AfxWinTerm();
　return nReturnCode;
}
AfxEndDeferRegisterClass
#define AfxDeferRegisterClass(fClass) AfxEndDeferRegisterClass(fClass)
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;
　wndcls.hInstance = AfxGetInstanceHandle();
　wndcls.hCursor = afxData.hcurArrow;
　INITCOMMONCONTROLSEX init;
　init.dwSize = sizeof(init);
　//各种各样的窗口类的注册
　// 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);
　}
　// 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;
}
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);
　LPCTSTR lpszTitle = m_strTitle;
　if (!Create(lpszClass, lpszTitle, dwDefaultStyle, rectDefault,
pParentWnd, MAKEINTRESOURCE(nIDResource), 0L, pContext))
　{
　　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;
}
CWnd::CreateEx()
virtual BOOL CreateEx(
　DWORD dwExStyle,
　LPCTSTR lpszClassName,
　LPCTSTR lpszWindowName,
　DWORD dwStyle,
　int x,
　int y,
　int nWidth,
　int nHeight,
　HWND hWndParent,
　HMENU nIDorHMenu,
　LPVOID lpParam = NULL
);
virtual BOOL CreateEx(
　DWORD dwExStyle,
　LPCTSTR lpszClassName,
　LPCTSTR lpszWindowName,
　DWORD dwStyle,
　const RECT& rect,
　CWnd* pParentWnd,
　UINT nID,
　LPVOID lpParam = NULL
);
CMainFrame::PreCreateWindow()
virtual BOOL PreCreateWindow(
　CREATESTRUCT& cs
);
typedef struct tagCREATESTRUCT {
　LPVOID lpCreateParams;
　HANDLE hInstance;
　HMENU hMenu;
　HWND hwndParent;
　int cy;
　int cx;
　int y;
　int x;
　LONG style;
　LPCSTR lpszName;
　LPCSTR lpszClass;
　DWORD dwExStyle;
} CREATESTRUCT;
CwinThread::Run()
int CWinApp::Run()
{
　if (m_pMainWnd == NULL && AfxOleGetUserCtrl())
　{
　　// Not launched /Embedding or /Automation, but has no main window!
　　TRACE0("Warning: m_pMainWnd is NULL in CWinApp::Run - quitting application.
");
　　AfxPostQuitMessage(0);
　}
　return CWinThread::Run();
}
int CWinThread::Run()
{
　ASSERT_VALID(this);
　// for tracking the idle time state
BOOL bIdle = TRUE;
LONG lIdleCount = 0;
// acquire and dispatch messages until a WM_QUIT message is received.
for (;;)/进入消息循环
{
　// phase1: check to see if we can do idle work
　while (bIdle && !::PeekMessage(&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))
　　{
　　　bIdle = TRUE;
　　　lIdleCount = 0;
　　}
　} while (::PeekMessage(&m_msgCur, NULL, NULL, NULL, PM_NOREMOVE));
}
ASSERT(FALSE); // not reachable
}