MFC架构

MFC的六大关键技术：

1）MFC程序的初始化过程

2）消息映射

3）运行时类型识别（RTTI）

4）动态创建

5）永久保存

6）消息传递

一、MFC的初始化过程：

MFC的架构组成：

1.要有CWinApp的派生类

2.必须在全局区定义一个派生类的对象

3.在CWinApp派生类中必须对InitInstance（）函数进行重写

【在MFC软件工程中，以APP类中的InitInstance（）函数作为主函数，连接MFC的平台使用static Library静态链接库】

#include "stdafx.h"

class CMyApp:public CWinApp
{
    virtual BOOL InitInstance()
    {        
        AfxMessageBox("xx");
        return TRUE;
    }
};
CMyApp theApp;
/*
int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
     // TODO: Place code here.
    MessageBox(NULL,"Win32测试MFC程序","测试",0);
    return 0;
}
*/

消息映射机制：
1.必须使用类向导建立一个窗口类(CWin)的派生类
2.必须建立派生类的对象，来接受客户界面返回的消息
//在窗口派生类中，每个消息都与一个成员函数相对应
3.消息映射函数，必须通过类向导(ClassWizard)建立

 

Win32的消息处理机制：

#include "stdafx.h"
BOOL CALLBACK DialogProc(
  HWND hwndDlg,  // handle to dialog box
  UINT uMsg,     // message
  WPARAM wParam, // first message parameter
  LPARAM lParam  // second message parameter
)
{
    if(uMsg==WM_COMMAND)
    {
        if(LOWORD(wParam)==IDCANCEL)
        {
            EndDialog(hwndDlg,IDCANCEL);
            return TRUE;
        }
    }
    if(uMsg==WM_LBUTTONDOWN)
    {
        int x=LOWORD(lParam);
        int y=HIWORD(lParam);
        char ch[22];
        sprintf(ch,"(%3d,%3d)",x,y);
        //MessageBox(NULL,ch,"",MB_OK);
        SetWindowText(hwndDlg,ch);
    }
    if(uMsg==WM_MOUSEMOVE)
    {
        int x=LOWORD(lParam);
        int y=HIWORD(lParam);
        char ch[22];
        sprintf(ch,"(%3d,%3d)",x,y);
        //MessageBox(NULL,ch,"",MB_OK);
        SetWindowText(hwndDlg,ch);
    }
    return FALSE;

}

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
     // TODO: Place code here.
    //MessageBox(NULL,"Win32测试MFC程序","测试",0);
    DialogBox(hInstance,(LPCSTR)IDD_DIALOG1,NULL,DialogProc);
    return 0;

}

 MFC的消息处理机制

//theApp:

#include "stdafx.h"
#include"MainDlg.h"
class MyApp:public CWinApp
{
    virtual BOOL InitInstance( )
    {
        //AfxMessageBox("cc",NULL,MB_OK);
        //CDialog *dlg=new CDialog(IDD_DIALOG1);
        //dlg->DoModal();
        MainDlg *dlg=new MainDlg();
        dlg->DoModal();
        return TRUE;
    }
};
MyApp theApp;

//MainDlg派生类
#include "stdafx.h"
#include "MainDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// MainDlg dialog
MainDlg::MainDlg(CWnd* pParent /*=NULL*/)
    : CDialog(MainDlg::IDD, pParent)
{
    //{{AFX_DATA_INIT(MainDlg)
        // NOTE: the ClassWizard will add member initialization here
    //}}AFX_DATA_INIT
}

void MainDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(MainDlg)
        // NOTE: the ClassWizard will add DDX and DDV calls here
    //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(MainDlg, CDialog)
    //{{AFX_MSG_MAP(MainDlg)
    ON_WM_LBUTTONDOWN()
    ON_WM_MOUSEMOVE()
    ON_WM_RBUTTONDOWN()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// MainDlg message handlers
BOOL MainDlg::OnInitDialog()
{
    CDialog::OnInitDialog();
    //Title
    CDialog::SetWindowText("测试");
    //Icon
    HICON hicon=LoadIcon(AfxGetInstanceHandle(),(LPCSTR)IDI_ICON1);
    CDialog::SetIcon(hicon,TRUE);
    return TRUE;
}
void MainDlg::OnLButtonDown(UINT nFlags, CPoint point) 
{
    // TODO: Add your message handler code here and/or call default
    
    CDialog::OnLButtonDown(nFlags, point);
    CString str;
    str.Format("(%d,%d)",point.x,point.y);
    if(MK_SHIFT&nFlags)
        str+="按下了Shift键";
    if(MK_CONTROL&nFlags)
        str+="按下了Ctrl键";
    if(MK_LBUTTON&nFlags)
        str+="按下了鼠标左键";
    if(MK_MBUTTON&nFlags)
        str+="按下了鼠标中键";
    if(MK_RBUTTON&nFlags)
        str+="按下了鼠标右键";
    AfxMessageBox(str);
    //CDialog::GetDlgItemText(IDC_TEXT_COORD,str);
}
void MainDlg::OnRButtonDown(UINT nFlags, CPoint point) 
{
    // TODO: Add your message handler code here and/or call default
    
    CDialog::OnRButtonDown(nFlags, point);
    CDialog::OnLButtonDown(nFlags, point);
    CString str;
    str.Format("(%d,%d)",point.x,point.y);
    if(MK_SHIFT&nFlags)
        str+="按下了Shift键";
    if(MK_CONTROL&nFlags)
        str+="按下了Ctrl键";
    if(MK_LBUTTON&nFlags)
        str+="按下了鼠标左键";
    if(MK_MBUTTON&nFlags)
        str+="按下了鼠标中键";
    if(MK_RBUTTON&nFlags)
        str+="按下了鼠标右键";
    AfxMessageBox(str);
}
void MainDlg::OnMouseMove(UINT nFlags, CPoint point) 
{
    // TODO: Add your message handler code here and/or call default
    
    CDialog::OnMouseMove(nFlags, point);
    CString str;
    str.Format("(%d,%d)",point.x,point.y);
    GetDlgItemText(IDC_TEXT_COORD,str);
}