}
(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, \\\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), 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; }
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, \nd.\\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, \ 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, \r 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))