C / C++ / MFC

Matthew Faithfull wrote:

you couldn't do it in VC6

Matthew Faithfull wrote:

namespace polluting #defines

George_George wrote:

Why it is namespace polluting? It is defined in the global/default namespace?

Matthew Faithfull wrote:

which basically means a name should only be defined for the scope where it is meant to be used.

Matthew Faithfull wrote:

Four types, the fourth being codespace

"If a static data member is of const integral or const enumeration type, its
declaration in the class definition can specify a constant-initializer which
shall be an integral constant expression. In that case, the member can
appear in integral constant expressions within its scope. The member shall
still be defined in a namespace scope if it is used in the program and the
namespace scope definition shall not contain an initializer."

So the only relaxation is that for static const integral/enum types you can
get away with the definition if you don't use them in their program i.e.
don't treat them as l-values. The key point you are missing is that the
member can still appear in integral constant expressions (like case label).
So this clause is just a relaxation applicable only with integral constant
expressions.

class MaxBuffer
{
public:
 const static int Max = 80;

 int m_iBuffer[Max];
};

class ErrorBuffer
{
public:
 static int Max;     // this can be changed later

 int m_iBuffer[Max]; // Gives an error, needs a constant
};

BadKarma wrote:

don't treat them as l-values

class Foo{
public:
	const static int size = 100;
};

int main()
{
	cout << &(Foo::size);
	return 0;
}

George_George wrote:

What means "integral constant expression"?

George_George wrote:

Means for const static member variable, they are not l-value? Actually, I do not agree since for the const static member variable, it is addressable, so it should be a l-value.

Royaltvk wrote:

It is not displaying either Dll Registered or Failed messge.

CoInitialize(NULL);<br />
		BSTR str;<br />
<br />
      	IDUOleServerImpl *pDXOLEServer;<br />
    	<br />
<br />
 HRESULT hr = CoCreateInstance(CLSID_DUOleServerImpl, NULL, CLSCTX_ALL,<br />
    	IID_IDUOleServerImpl, (LPVOID *)&pDXOLEServer);<br />
    	if( !pDXOLEServer )<br />
		{	<br />
		szResponse ="Problem in Creating the DXOLE Engine Server";<br />
		<br />
		return ;<br />
		}<br />
    	//End Code added by Pavan for the extn DU_EXTN_013 on 9 Feb 2005<br />
<br />
         //pDXOLEServer->ExecuteRequest(10008,sRequestParameters,&str);<br />
		<br />
		pDXOLEServer->ExecuteRequest(10001,bstrConnectionInfo,&str);<br />

Royaltvk wrote:

But If i try to register the COM DLL for CmdLine Regsvr32, it is not throwing any success or failure notice.

Chandrasekharanp wrote:

if the focus is lost the the value should display.

#import "msado15.dll" no_namespace rename ("EOF", "adoEOF")

if(OleInitialize(NULL) != S_OK)
{
  // Error, stop
}

CString strConnectionString;
strConnectionString.Format("uid=USER_ID;pwd=PASSWORD;driver={SQL Server};server=SQLSERVERNAME;database=DATABASE_NAME");

_ConnectionPtr ptrDbCon;
ptrDbCon.CreateInstance(__uuidof(Connection));
ptrDbCon->Open((_bstr_t)strConnectionString, "", "", -1);
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