首页 > 代码库 > MFC程序运行流程

MFC程序运行流程

2024-07-03 08:20:26   225人阅读

->进入入口函数_tWinMain()

程序首先进入文件AppModul.cpp，找到_tWinMain()函数运行，调用其中的AfxWinMain()函数。

由于为了支持UNICODE,C运行库对WinMain其实区分了UNICODE版和ANSI版.对UNICODE版的程序,C运行库将调用wWinMain,而对于ANSI版的应用,则调用WinMain.

MFC的代码设计时是自动支持UNICODE的,所以,MFC的WinMain在APPMODUL.CPP被定义为_tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)，无论用户#define _UNICODE与否,MFC的WinMain都会被调用.

?
1
2
3
4
5
6
7
8
extern "C" int WINAPI
_tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    _In_ LPTSTR lpCmdLine, int nCmdShow)
#pragma warning(suppress: 4985)
{
    // call shared/exported WinMain
    return AfxWinMain(hInstance, hPrevInstance, lpCmdLine, nCmdShow);
}

hInstance:表示该程序当前运行的实例句柄，它是一个数值。当程序在Windows下运行时，它唯一标识运行中的实例。

hPrevInstance:父窗口句柄。这个参数在Win32下已经不起作用了。

lpCmpLine:指定传递给应用程序的命令行参数。

nCmdShow:指定程序窗口如何显示，例如最大化、最小化、隐藏等。

 

->进入AfxWinMain()

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
int AFXAPI AfxWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    _In_ LPTSTR lpCmdLine, int nCmdShow)
{
    ASSERT(hPrevInstance == NULL);
 
    int nReturnCode = -1;
    CWinThread* pThread = AfxGetThread();//返回指向theApp的指针
    CWinApp* pApp = AfxGetApp();//返回指向theApp的指针
 
    // AFX internal initialization
    if (!AfxWinInit(hInstance, hPrevInstance, lpCmdLine, nCmdShow))//初始化应用程序内部环境，设置MFC
        goto InitFailure;
 
    // App global initializations (rare)
    if (pApp != NULL && !pApp->InitApplication())//初始化应用程序内部环境，设置MFC
        goto InitFailure;
 
    // Perform specific initializations
    if (!pThread->InitInstance())//完成应用程序相关工作：设计窗口类、注册窗口类、创建窗口类、显示窗口类、更新窗口类
    {
        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();//进入消息循环，处理系统消息。
 
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;
}

->pThread->InitInstance()

这是个虚函数，pThread指向的是theApp，调用的是子类C***App类中的InitInstance函数。

KuaiPaiClient项目中的该函数为：

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
BOOL CKuaiPanClientApp::InitInstance()
{
    // InitCommonControlsEx() is required on Windows XP if an application
    // manifest specifies use of ComCtl32.dll version 6 or later to enable
    // visual styles.  Otherwise, any window creation will fail.
    INITCOMMONCONTROLSEX InitCtrls;
    InitCtrls.dwSize = sizeof(InitCtrls);
    // Set this to include all the common control classes you want to use
    // in your application.
    InitCtrls.dwICC = ICC_WIN95_CLASSES;
    InitCommonControlsEx(&InitCtrls);
 
    CWinAppEx::InitInstance();
 
 
    // Initialize OLE libraries
    if (!AfxOleInit())
    {
        AfxMessageBox(IDP_OLE_INIT_FAILED);
        return FALSE;
    }
 
    AfxEnableControlContainer();
 
    EnableTaskbarInteraction(FALSE);
 
    // AfxInitRichEdit2() is required to use RichEdit control  
    // AfxInitRichEdit2();
 
    // 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
    // Change the registry key under which our settings are stored
    // TODO: You should modify this string to be something appropriate
    // such as the name of your company or organization
    SetRegistryKey(_T("Local AppWizard-Generated Applications"));
    LoadStdProfileSettings(4);  // Load standard INI file options (including MRU)
?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
    InitContextMenuManager();
 
    InitKeyboardManager();
 
    InitTooltipManager();
    CMFCToolTipInfo ttParams;
    ttParams.m_bVislManagerTheme = TRUE;
    theApp.GetTooltipManager()->SetTooltipParams(AFX_TOOLTIP_TYPE_ALL,
        RUNTIME_CLASS(CMFCToolTipCtrl), &ttParams);
 
    // Register the application‘s document templates.  Document templates
    //  serve as the connection between documents, frame windows and views
    CSingleDocTemplate* pDocTemplate;
    pDocTemplate = new CSingleDocTemplate(
        IDR_MAINFRAME,
        RUNTIME_CLASS(CKuaiPanClientDoc),
        RUNTIME_CLASS(CMainFrame),       // main SDI frame window
        RUNTIME_CLASS(CKuaiPanClientView));
    if (!pDocTemplate)
        return FALSE;
    AddDocTemplate(pDocTemplate);//将Doc类、CMainFrame和CView三个类用文档模板关联到一起，装载到当前应用程序的全局对象theApp中。
 
    // Parse command line for standard shell commands, DDE, file open
    CCommandLineInfo cmdInfo;
    ParseCommandLine(cmdInfo);
 
    // Dispatch commands specified on the command line.  Will return FALSE if
    // app was launched with /RegServer, /Register, /Unregserver or /Unregister.
    if (!ProcessShellCommand(cmdInfo))
        return FALSE;
 
    // The one and only window has been initialized, so show and update it
    m_pMainWnd->ShowWindow(SW_SHOW);
    m_pMainWnd->UpdateWindow();
    // call DragAcceptFiles only if there‘s a suffix
    //  In an SDI app, this should occur after ProcessShellCommand
    return TRUE;
}


联系
我们