I want to write a REG_MULTI_SZ value (e.g 100-104) in registry. My code is like

HKEY objHKey;
CString strReturn;
CString subkey("SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters");

// Open Registry key for Vlc Path
if( RegOpenKey( HKEY\_LOCAL\_MACHINE,
				(LPCTSTR)subkey,	// what to open
				&objHKey				// on success, handle goes here
				) == ERROR\_SUCCESS )
{
	unsigned char \* format =  new unsigned char \[100\];
	unsigned char p1\[5\] = "998";
	unsigned char p2\[5\] = "999";
	sprintf((char\*)format, "%s\\\\0%s\\\\0\\\\0", p1, p2);
	int ILenght = 20;//strlen(format);

	unsigned char \*ptr=  (unsigned char \*) strTemp.GetBuffer(0);
	
	if(ERROR\_SUCCESS != RegSetValueEx(objHKey,
					\_T("ReservedPorts"),
					NULL,
					REG\_MULTI\_SZ,
					//(BYTE\*)\_T("1000-1004"),
					ptr,
					strTemp.GetLength()))
					
	{
		AfxMessageBox(\_T("Failed to update in registry."));
	}
	
	// Close the registry
	RegCloseKey( objHKey );
}

But this is not updating in registry.

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