C / C++ / MFC

Richard Andrew x64 wrote:

These header files describe the public interfaces of the classes, but do not
reveal the private members.

// named message logging class
class ILog {
public:
   static ILog* createInstance(const std::string& name); // new log instance - free with delete
   virtual ~ILog() {}
   virtual void Info(const std::string& context, const std::string& message)=0;
   virtual void Warning(const std::string& context, const std::string& message)=0;
   virtual void Error(const std::string& context, const std::string& message)=0;
};

// log implementation
class CLog : public ILog {
   std::string name_;
public:
   CLog(std::string& name) : name_(name) {} // constructor
   virtual ~CLog() {}
   virtual void Info(const std::string& context, const std::string& message);
   virtual void Warning(const std::string& context, const std::string& message);
   virtual void Error(const std::string& context, const std::string& message);
};
ILog* ILog::createInstance(const std::string& name) {
   return new CLog(name);
}

Stefan_Lang wrote:

However, the class supplied in the header may just be an interface, and the actual implementation may come from a derived class which you don't know

Stefan_Lang wrote:

and the actual implementation may come from a derived class which you don't know
(and don't need to know) the definition of

Erudite_Eric wrote:

If the class definition is in a header and is being used, then all its base classes will also have to be declared.

Erudite_Eric wrote:

The OP didnt mention base or derived
classes.

Stefan_Lang wrote:

That is not the point at all.

HANDLE hProcess = ::GetCurrentProcess();

HANDLE hToken;
::OpenProcessToken(hProcess, TOKEN_QUERY, &hToken);

PTOKEN_ELEVATION_TYPE ele = 0;
DWORD dwLen;
::GetTokenInformation(hToken, TokenElevationType, (LPVOID)ele, 0, &dwLen);

ele = (PTOKEN_ELEVATION_TYPE)::HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, dwLen);
::GetTokenInformation(hToken, TokenElevationType, (LPVOID)ele, dwLen, &dwLen);