sam_sp_34dlg.cpp

专题讲座三：内容包括跟踪与中间过程输出、变量和对象合法性检查、内存泄露检查、异常捕捉与处理等。包含源码

// sam_sp_34Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "sam_sp_34.h"
#include "sam_sp_34Dlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CSam_sp_34Dlg dialog

CSam_sp_34Dlg::CSam_sp_34Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CSam_sp_34Dlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CSam_sp_34Dlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CSam_sp_34Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CSam_sp_34Dlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CSam_sp_34Dlg, CDialog)
	//{{AFX_MSG_MAP(CSam_sp_34Dlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_TC, OnTc)
	ON_BN_CLICKED(IDC_TC_E, OnTcE)
	ON_BN_CLICKED(IDC_JT, OnJt)
	ON_BN_CLICKED(IDC_CP, OnCp)
	ON_BN_CLICKED(IDC_MFC_F, OnMfcF)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CSam_sp_34Dlg message handlers

BOOL CSam_sp_34Dlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

// 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 CSam_sp_34Dlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int 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 icon
		dc.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 CSam_sp_34Dlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void do_something()
{
	static int iTime=0;
	switch(iTime++%3)
	{
	case(0):
		throw (int)1;
	break;
	case(1):
		throw "error";
	break;
	case(2):
		throw (double)1.1;
	break;
	}
}
void do_something_2()
{
	try
	{
		do_something();
	}
	catch(...)
	{
		AfxMessageBox("catched and throw");
		throw;
	}
}
void do_something_3()
{
	try
	{
		do_something();
	}
	catch(int e)
	{
		AfxMessageBox("catched int");
	}
}
void CSam_sp_34Dlg::OnTc() 
{
	try
	{
		do_something();
	}
	catch (int e)
	{
		AfxMessageBox("error handler1\n");
	}
	catch (char* sz)
	{
		AfxMessageBox("error handler2\n");
	}
}

void CSam_sp_34Dlg::OnTcE() 
{
	try
	{
		do_something();
	}
	catch (int e)
	{
		AfxMessageBox("error handler1\n");
	}
	catch (char* sz)
	{
		AfxMessageBox("error handler2\n");
	}
	catch (...)
	{
		AfxMessageBox("catch all\n");
	}
}

void CSam_sp_34Dlg::OnJt() 
{
	try
	{
		do_something_2();
	}
	catch (int e)
	{
		AfxMessageBox("error handler1\n");
	}
	catch (char* sz)
	{
		AfxMessageBox("error handler2\n");
	}
	catch (...)
	{
		AfxMessageBox("catch all\n");
	}
}

void CSam_sp_34Dlg::OnCp() 
{
	try
	{
		do_something_3();
	}
	catch (int e)
	{
		AfxMessageBox("error handler1\n");
	}
	catch (char* sz)
	{
		AfxMessageBox("error handler2\n");
	}
	catch (...)
	{
		AfxMessageBox("catch all\n");
	}
}

void CSam_sp_34Dlg::OnMfcF() 
{
	try
	{
		CFile fileTest("c:\\not_exist.txt",CFile::modeRead);
	}
	catch(CException *e)
	{//使用基类进行捕捉
		e->ReportError();
	}
	
	try
	{
		CFile fileTest2("c:\\autoexec.bat",CFile::modeRead);
		char szLine[100]="rem test line\n";
		fileTest2.Write(szLine,strlen(szLine));
	}
	catch(CFileException *e)
	{//使用文件异常类进行捕捉
		e->ReportError();
	}
}