C / C++ / MFC

pathakr wrote:

Now I want to free obj. Should I directly make equate with NULL
or delete obj;

pathakr wrote:

I declare it as CObject *obj=NULL;
then from a function I assign a object pointer to this one.
but then after modifying the object i wanted to vacate this one. (obj).

pathakr wrote:

Thanks Nibu.

CAnotherObject anObject;
CObject *pToAnObject = &anObject; //pointer to anObject
 
//In this case don't delete just set to NULL. This will break the link between
//pToAnObject and anObject.
pToAnObject = NULL;

CAnotherObject *anObject = new CAnotherObject;
CObject *pToAnObject = anObject; //pointer to anObject
 
//In this case you have to identify whose responsibility is it to <code>delete </code>the 
//object. Best would be to allow <code>anObject </code>to <code>delete </code>itself unless otherwise
//specified.
pToAnObject = NULL;
 
//delete anObject.
delete anObject;

class TestClass<br />
{<br />
  static int i;<br />
public :<br />
  TestClasss()<br />
   {<br />
    if(i>=3)<br />
      exit(0);<br />
    else<br />
      i++;<br />
   }<br />
// Carry on with your code<br />
};

kumar_windows wrote:

Is there any way i can control the creation of the objects for a class, like for example we have a singleton class for which we can create only a single instance, likewise i wanna limit the creation of objects say only 2 objects for a class or only 3 object for the class

LPSTR lpszBuf;
 
//lpszBuf will have the IPAddress. There could be more than one IPAddresses separated by comma.
GetIPAddress(lpszBuf);
 
<code>//Use it...</code>
 
<code>//don't forget to delete, coz memory is allocated inside the module</code>
delete [] lpszBuf;

BOOL GetIPAddress(LPSTR* lpszBuffer)
{
         WSADATA wsaData;
	::ZeroMemory(&wsaData, sizeof(WSADATA));
	
	 <code>//init winsock</code>
	int retCode = WSAStartup(MAKEWORD(2,2), &wsaData);
	
	if(retCode != 0)
		return FALSE;//probably version not supported
	
	CHAR szHostName[MAX_COMPUTERNAME_LENGTH];
	<code>//get computer name</code>
	gethostname(szHostName, MAX_COMPUTERNAME_LENGTH);
	
	//host entry structure
	LPHOSTENT hstEnt;
         <code>//get the IPAddress</code>
	hstEnt = gethostbyname(szHostName);
	
	if(hstEnt != NULL)
	{
		int nCount=0;
		
		<code>//get total ip's</code>
		while(hstEnt->h_addr_list[nCount++]!=NULL)
			;
		
		<code>*lpszBuffer = new CHAR[20*nCount];</code>
		**lpszBuffer = NULL;

		int nIndex = 0;
		
		<code>//start retrieving the ip's</code>
		while(hstEnt->h_addr_list[nIndex] != NULL)
		{
			strcat(
			*lpszBuffer,(CHAR*) 
			inet_ntoa(*(struct in_addr *)hstEnt->h_addr_list[nIndex++])
			);
 
                           //we should not have a comma after the last IPAddress, in case there are more that one IPAddresses.
			if(nCount < nCount-1)
				strcat(*lpszBuffer, (","));
		}
	}
	else
		return FALSE;
	
	WSACleanup();//close up :)

	return TRUE;
}

bob16972 wrote:

Nish's numbers

SaRath C wrote:

http://msdn2.microsoft.com/en-us/library/bw65k95a.aspx[^]