c++ mfc CFile+CArchive 简单实践
1 概要
1.1CFile(源码)
MFC提供了CFile类方便文件的读写，首先要知道，文件的数据读取、数据写入与文件指针的操作都是以字节为单位的，数据的读取和写入都是从文件指针的位置开始的，当打开一个文件的时候，文件指针总是在文件的开头。常规方法如下：
CFile file;file.open( LPCTSTR lpszFileName, UINT nOpenFlags, CFileException* pError = NULL );//lpszFileName是文件名，可包含文件路径，若只有文件名，则默认路径为工程路径，nOpenFlags是文件打开模式，pError是打开失败时用来接收失败信息，一般设置为NULL。
1.2 CArchive
当我们创建对象的时候，对象就存在于内存中，当其生命周期结束后，这些被创建的对象就要被销毁；当对象被销毁后，我们就无法知道这些对象的值。MFC提供了CArchive类可以将对象数据保存到永久设备，比如磁盘文件。当应用程序重新启动后，CArchive类可以帮助我们从磁盘文件读取这些数据，然后在内存中重新构建对应的对象；这样就使得我们的对象数据永久存在，该过程称之为序列化（或者串行化）。
2 代码
2.1 摘要
double g_data1 = 0.0;
double g_data2 = 0.0;
double g_data3 = 0.0;
int g_ndata = 0;void CCFileTestDlg::OnButton1()
{// TODO: Add your control notification handler code hereCString data1,data2,data3,data4;CFile SetFile;if(SetFile.Open(_T("setfujiandata.ini"),CFile::modeRead)){ CArchive ar(&SetFile,CArchive::load);try{ar >> data1;ar >> data2;ar >> data3;ar >> data4;}catch(CArchiveException* e){e->ReportError();e->Delete();ar.Close();SetFile.Close();}ar.Close();SetFile.Close();g_data1 = atof(data1);g_data2 = atof(data2);g_data3 = atof(data3);g_ndata = atoi(data4);SetDlgItemText(IDC_EDIT1,data1);SetDlgItemText(IDC_EDIT2,data2);SetDlgItemText(IDC_EDIT3,data3);SetDlgItemText(IDC_EDIT4,data4);}
}void CCFileTestDlg::OnButton2()
{// TODO: Add your control notification handler code here// TODO: 在此添加控件通知处理程序代码CString data1,data2,data3,data4;GetDlgItemText(IDC_EDIT1,data1);GetDlgItemText(IDC_EDIT2,data2);GetDlgItemText(IDC_EDIT3,data3);GetDlgItemText(IDC_EDIT4,data4);CFile SetFile;if(SetFile.Open(_T("setfujiandata.ini"),CFile::modeCreate|CFile::modeWrite)){ CArchive ar(&SetFile,CArchive::store);try{ar << data1;ar << data2;ar << data3;ar << data4;}catch(CArchiveException* e){e->ReportError();e->Delete();ar.Close();SetFile.Close();}g_data1 = atof(data1);g_data2 = atof(data2);g_data3 = atof(data3);g_ndata = atof(data4);ar.Close();SetFile.Close();//g_bSet = true;MessageBox(_T("保存成功！"));}else{MessageBox(_T("保存失败！"));}
}void CCFileTestDlg::OnButton4()
{// TODO: Add your control notification handler code hereSetDlgItemText(IDC_EDIT1,"");SetDlgItemText(IDC_EDIT2,"");SetDlgItemText(IDC_EDIT3,"");SetDlgItemText(IDC_EDIT4,"");
}
2.2 代码
// CFileTestDlg.cpp : implementation file
//#include "stdafx.h"
#include "CFileTest.h"
#include "CFileTestDlg.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif/
// CAboutDlg dialog used for App Aboutclass CAboutDlg : public CDialog
{
public:CAboutDlg();// Dialog Data//{{AFX_DATA(CAboutDlg)enum { IDD = IDD_ABOUTBOX };//}}AFX_DATA// ClassWizard generated virtual function overrides//{{AFX_VIRTUAL(CAboutDlg)protected:virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support//}}AFX_VIRTUAL// Implementation
protected://{{AFX_MSG(CAboutDlg)//}}AFX_MSGDECLARE_MESSAGE_MAP()
};CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{//{{AFX_DATA_INIT(CAboutDlg)//}}AFX_DATA_INIT
}void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{CDialog::DoDataExchange(pDX);//{{AFX_DATA_MAP(CAboutDlg)//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)//{{AFX_MSG_MAP(CAboutDlg)// No message handlers//}}AFX_MSG_MAP
END_MESSAGE_MAP()/
// CCFileTestDlg dialogCCFileTestDlg::CCFileTestDlg(CWnd* pParent /*=NULL*/): CDialog(CCFileTestDlg::IDD, pParent)
{//{{AFX_DATA_INIT(CCFileTestDlg)// NOTE: the ClassWizard will add member initialization here//}}AFX_DATA_INIT// Note that LoadIcon does not require a subsequent DestroyIcon in Win32m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}void CCFileTestDlg::DoDataExchange(CDataExchange* pDX)
{CDialog::DoDataExchange(pDX);//{{AFX_DATA_MAP(CCFileTestDlg)// NOTE: the ClassWizard will add DDX and DDV calls here//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CCFileTestDlg, CDialog)//{{AFX_MSG_MAP(CCFileTestDlg)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_BUTTON1, OnButton1)ON_BN_CLICKED(IDC_BUTTON2, OnButton2)ON_BN_CLICKED(IDC_BUTTON4, OnButton4)//}}AFX_MSG_MAP
END_MESSAGE_MAP()/
// CCFileTestDlg message handlersBOOL CCFileTestDlg::OnInitDialog()
{CDialog::OnInitDialog();// Add "About..." menu item to system menu.// IDM_ABOUTBOX must be in the system command range.ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);ASSERT(IDM_ABOUTBOX < 0xF000);CMenu* pSysMenu = GetSystemMenu(FALSE);if (pSysMenu != NULL){CString strAboutMenu;strAboutMenu.LoadString(IDS_ABOUTBOX);if (!strAboutMenu.IsEmpty()){pSysMenu->AppendMenu(MF_SEPARATOR);pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);}}// Set the icon for this dialog. The framework does this automatically// when the application's main window is not a dialogSetIcon(m_hIcon, TRUE); // Set big iconSetIcon(m_hIcon, FALSE); // Set small icon// TODO: Add extra initialization herereturn TRUE; // return TRUE unless you set the focus to a control
}void CCFileTestDlg::OnSysCommand(UINT nID, LPARAM lParam)
{if ((nID & 0xFFF0) == IDM_ABOUTBOX){CAboutDlg dlgAbout;dlgAbout.DoModal();}else{CDialog::OnSysCommand(nID, lParam);}
}// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.void CCFileTestDlg::OnPaint()
{if (IsIconic()){CPaintDC dc(this); // device context for paintingSendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);// Center icon in client rectangleint cxIcon = GetSystemMetrics(SM_CXICON);int cyIcon = GetSystemMetrics(SM_CYICON);CRect rect;GetClientRect(&rect);int x = (rect.Width() - cxIcon + 1) / 2;int y = (rect.Height() - cyIcon + 1) / 2;// Draw the icondc.DrawIcon(x, y, m_hIcon);}else{CDialog::OnPaint();}
}// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CCFileTestDlg::OnQueryDragIcon()
{return (HCURSOR) m_hIcon;
}double g_data1 = 0.0;
double g_data2 = 0.0;
double g_data3 = 0.0;
int g_ndata = 0;void CCFileTestDlg::OnButton1()
{// TODO: Add your control notification handler code hereCString data1,data2,data3,data4;CFile SetFile;if(SetFile.Open(_T("setfujiandata.ini"),CFile::modeRead)){ CArchive ar(&SetFile,CArchive::load);try{ar >> data1;ar >> data2;ar >> data3;ar >> data4;}catch(CArchiveException* e){e->ReportError();e->Delete();ar.Close();SetFile.Close();}ar.Close();SetFile.Close();g_data1 = atof(data1);g_data2 = atof(data2);g_data3 = atof(data3);g_ndata = atoi(data4);SetDlgItemText(IDC_EDIT1,data1);SetDlgItemText(IDC_EDIT2,data2);SetDlgItemText(IDC_EDIT3,data3);SetDlgItemText(IDC_EDIT4,data4);}
}void CCFileTestDlg::OnButton2()
{// TODO: Add your control notification handler code here// TODO: 在此添加控件通知处理程序代码CString data1,data2,data3,data4;GetDlgItemText(IDC_EDIT1,data1);GetDlgItemText(IDC_EDIT2,data2);GetDlgItemText(IDC_EDIT3,data3);GetDlgItemText(IDC_EDIT4,data4);CFile SetFile;if(SetFile.Open(_T("setfujiandata.ini"),CFile::modeCreate|CFile::modeWrite)){ CArchive ar(&SetFile,CArchive::store);try{ar << data1;ar << data2;ar << data3;ar << data4;}catch(CArchiveException* e){e->ReportError();e->Delete();ar.Close();SetFile.Close();}g_data1 = atof(data1);g_data2 = atof(data2);g_data3 = atof(data3);g_ndata = atof(data4);ar.Close();SetFile.Close();//g_bSet = true;MessageBox(_T("保存成功！"));}else{MessageBox(_T("保存失败！"));}
}void CCFileTestDlg::OnButton4()
{// TODO: Add your control notification handler code hereSetDlgItemText(IDC_EDIT1,"");SetDlgItemText(IDC_EDIT2,"");SetDlgItemText(IDC_EDIT3,"");SetDlgItemText(IDC_EDIT4,"");
}
3. 运行
4. 引用
4.1 CFile
https://blog.csdn.net/zhang_fei_fresh/article/details/76408636
4.2 CArchive
https://blog.csdn.net/c_base_jin/article/details/55060720
https://baike.baidu.com/item/CArchive/9600368?fr=aladdin
https://www.cnblogs.com/lujin49/p/4967417.html
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