问个简单问题

[happybeginner]

用MFC建个简单的对话框应用程序, 然后单步调试想了解下它的大体流程, 看到下面的代码:
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())
goto InitFailure;

// Perform specific initializations
if (!pThread->InitInstance())////*################不理解#######/////
{
if (pThread->m_pMainWnd != NULL)
{
TRACE0("Warning: Destroying non-NULL m_pMainWnd\n");
pThread->m_pMainWnd->DestroyWindow();
}
nReturnCode = pThread->ExitInstance();
goto InitFailure;
}
nReturnCode = pThread->Run();
其中if (!pThread->InitInstance())这一行很不理解, 我跟进pThread->InitInstanse()里面, 发现执行到了下面的函数,
请教下这是怎么会事, Cwinthread类里面的函数执行怎么跳到CWinApp里面来了?

CVirusProcessApp theApp;

/////////////////////////////////////////////////////////////////////////////
// CVirusProcessApp initialization

BOOL CVirusProcessApp::InitInstance()
{
AfxEnableControlContainer();

// Standard initialization
// If you are not using these features and wish to reduce the size
// of your final executable, you should remove from the following
// the specific initialization routines you do not need.

#ifdef _AFXDLL
Enable3dControls(); // Call this when using MFC in a shared DLL
#else
Enable3dControlsStatic(); // Call this when linking to MFC statically
#endif

CVirusProcessDlg dlg;
m_pMainWnd = &dlg;
int nResponse = dlg.DoModal();
if (nResponse == IDOK)
{
// TODO: Place code here to handle when the dialog is
// dismissed with OK
}
else if (nResponse == IDCANCEL)
{
// TODO: Place code here to handle when the dialog is
// dismissed with Cancel
}

// Since the dialog has been closed, return FALSE so that we exit the
// application, rather than start the application's message pump.
return FALSE;
}

[Ryanwen]

InitInstance是虚函数,CWinApp继承自Cwinthread 不知道这样说你明白没有

[happybeginner]

多谢楼上回复, CWinAPP是由Cwinthread派生出来的呀, 那就可以重载了. 我主要是觉得CWinthread看名字是个线程类, CwinApp是个
不象和他有关系. 多谢了.