class inside namespace

[newbiedev]

Hey,

I briefly did some programming with VB.Net and liked how easy it was to ping a machine using System.Net.NetInformation namespace.

I've tried to implement something similar in C++ but having problems obviously.

namespace System {
  namespace Net {
    namespace NetworkInformation {
      class Ping {
        public:
          Ping();
          ~Ping();
          bool Send(std::wstring host);
      };
    }
  }
}

I declare the Send() method like

bool Network::Ping::Send(std::wstring host)

I want to call Send() like

System::Net::NetInformation::Send(L"www.google.com");

but Visual Studio throws an error:

error C2352: 'Network::Ping::Send' : illegal call of non-static member function

Sorry but i'm new to C++ and have tried various different things to try resolve on my own.

[vlad from moscow]

That to call a non-static membber function of a class you should create at first an object of the class and use it to call the function. Or you should declare the function as static.

[newbiedev]

Thanks vlad, that solved the method problem but another issue with linker.

I have a vector in the class also which neither works with or without being declared static.

I keep a list of responses from any host here

typedef struct _ICMP_REPLY {
  DWORD dwCode;
  std::wstring Message;
  std::wstring Dns;
  std::wstring Ip;
} ICMP_REPLY, *PICMP_REPLY;

Inside the Ping class

static std::vector<ICMP_REPLY> replies;

the linker is throwing error for this unfortunately.

error LNK2019: unresolved external symbol "public: static class std::vector<struct _ICMP_REPLY,class std::allocator<struct _ICMP_REPLY> > Network::Ping::replies"

[vlad from moscow]

I think that the problem is that you did not define the vector. You only declared it inside the class but not defined. It shall be defined somewhere in a module outside the class.

[newbiedev]

I understand what you mean now and as a result used a different way to achieve what i wanted which works great.

Initially, Ping class returned vector of ICMP_REPLY but i created separate class PingReply and just add each reply there.

cheers, vlad.