StringValue not declared in this scope

[Xiruo Liu]

Hi,

I have a problem about StringValue(). Part of my code is show below:

              Ptr<UniformRandomVariable> t = CreateObject<UniformRandomVariable> ();

              int tunnelIndex = t ->GetInteger (1, nodeNum);

              std::string tmp;

              std::ostringstream convert;

              convert << tunnelIndex;

              tmp = convert.str();

              std::string TunnelIP = "10.1.1." + tmp;

              Ipv4Address fakey = Ipv4Address(StringValue(TunnelIP));

And I got the error : 'StringValue' was not declared in this scope. I included <string> already. Is there anyone can help me with this? Thanks in advance.

[Tommaso Pecorella]

Hi,

it's defined in "ns3/core-module.h" (or in "ns3/string.h")

T.

[Xiruo Liu]

Now I include "ns3/core-module.h",  "ns3/string.h" and <string> but still have error below. Any hint?

../src/internet/model/ipv4-l3-protocol.cc: In member function ‘virtual void ns3::Ipv4L3Protocol::Send(ns3::Ptr<ns3::Packet>, ns3::Ipv4Address, ns3::Ipv4Address, uint8_t, ns3::Ptr<ns3::Ipv4Route>)’:

../src/internet/model/ipv4-l3-protocol.cc:697:73: error: no matching function for call to ‘ns3::Ipv4Address::Ipv4Address(ns3::StringValue)’

../src/internet/model/ipv4-l3-protocol.cc:697:73: note: candidates are:

./ns3/ipv4-address.h:55:3: note: ns3::Ipv4Address::Ipv4Address(const char*)

./ns3/ipv4-address.h:55:3: note:   no known conversion for argument 1 from ‘ns3::StringValue’ to ‘const char*’

./ns3/ipv4-address.h:45:12: note: ns3::Ipv4Address::Ipv4Address(uint32_t)

./ns3/ipv4-address.h:45:12: note:   no known conversion for argument 1 from ‘ns3::StringValue’ to ‘uint32_t {aka unsigned int}’

./ns3/ipv4-address.h:40:3: note: ns3::Ipv4Address::Ipv4Address()

./ns3/ipv4-address.h:40:3: note:   candidate expects 0 arguments, 1 provided

./ns3/ipv4-address.h:38:7: note: ns3::Ipv4Address::Ipv4Address(const ns3::Ipv4Address&)

./ns3/ipv4-address.h:38:7: note:   no known conversion for argument 1 from ‘ns3::StringValue’ to ‘const ns3::Ipv4Address&’

[Konstantinos]

The output you get is clear.

You try to create a Ipv4Address using a non-defined constructor. Basically you pass the wrong type of argument. It just needs a const char*, i.e. Ipv4Address('192.168.0.1') is enough and Ipv4Address(StringValue('192.168.0.1')) is wrong!

[Xiruo Liu]

Yes, I should convert the string variable to char. Thank you very much.