Signals & Callbacks - Help!!

I am trying to hook the 'clicked' signal of a button to a callaback
function that receives a std::string value that will be displayed in a
Dialogbox. I have tried this:

callback function
gboolean MessageInfo(std::string& msg){...}

g_signal_connect(GTK_OBJECT(btnCreateAccount), "clicked",
                      GTK_SIGNAL_FUNC(MessageInfo), NULL);

But this does not work, can anyone help?


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