createnewrem.cpp

VC关于内存使用方法,有几个事例,欢迎下载研究

// CreateNewREM.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include "CreateNewREM.h"
#include "CreateNewREMDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CCreateNewREMApp

BEGIN_MESSAGE_MAP(CCreateNewREMApp, CWinApp)
	//{{AFX_MSG_MAP(CCreateNewREMApp)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG
	ON_COMMAND(ID_HELP, CWinApp::OnHelp)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCreateNewREMApp construction

CCreateNewREMApp::CCreateNewREMApp()
{
	// TODO: add construction code here,
	// Place all significant initialization in InitInstance
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CCreateNewREMApp object

CCreateNewREMApp theApp;

/////////////////////////////////////////////////////////////////////////////
// CCreateNewREMApp initialization

BOOL CCreateNewREMApp::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

	CCreateNewREMDlg 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;
}

//right
char *GetMemory3(int num)
{

 //   char *p = (char *)malloc(sizeof(char) * num);
	//new 的使用
	char *p=new char[num];	 
	//防错机制，内存耗尽强制结束程序
	if (p==NULL) {
		exit(1);
	}
    return p;

}

//error 运行时错误
void GetMemory(char *p, int num)
{

    p = (char *)malloc(sizeof(char) * num);
	if (p==NULL) {
		exit(1);
	}
}

//right
void GetMemory2(char **p, int num)
{

    *p = (char *)malloc(sizeof(char) * num);
	if (p==NULL) {
		exit(1);
	}

}

//error
//函数返回栈内存错误
char *GetString(void)
{

    char p[] = "hello world";

	// 编译器将提出警告***
    return p;   

}