I'm trying to learn the wxWidgets
framework as I've been assigned to work on a project which already uses the library.
I am using it on a Raspberry Pi, having installed it using sudo apt-get install libwxgtk2.8-dev libwxgtk2.8-dbg
.
I found this tutorial on the wxWidgets website and pasted it into a file called hello.cpp on my Pi.
Then I ran g++ hello.cpp -o hello
wx-config --cxxflags --libs` and I got the following enormous error message:
gcc hello.cpp -o hello `wx-config --cxxflags --libs` hello.cpp:20:27: error: ISO C++ forbids declaration of ‘wxDECLARE_EVENT_TABLE’ with no type [-fpermissive] hello.cpp:27:5: error: expected constructor, destructor, or type conversion before ‘wxEventTableEntry’ hello.cpp: In member function ‘virtual bool MyApp::OnInit()’: hello.cpp:34:84: error: conversion from ‘const char [12]’ to ‘const wxString’ is ambiguous hello.cpp:34:84: note: candidates are: /usr/include/wx-2.8/wx/string.h:692:3: note: wxString::wxString(wxChar, size_t) /usr/include/wx-2.8/wx/string.h:692:3: note: no known conversion for argument 1 from ‘const char [12]’ to ‘wxChar {aka wchar_t}’ /usr/include/wx-2.8/wx/string.h:682:3: note: wxString::wxString(int) /usr/include/wx-2.8/wx/string.h:682:3: note: no known conversion for argument 1 from ‘const char [12]’ to ‘int’ hello.cpp:15:5: error: initializing argument 1 of ‘MyFrame::MyFrame(const wxString&, const wxPoint&, const wxSize&)’ hello.cpp: In constructor ‘MyFrame::MyFrame(const wxString&, const wxPoint&, const wxSize&)’: hello.cpp:43:74: error: conversion from ‘const char [17]’ to ‘const wxString’ is ambiguous hello.cpp:43:74: note: candidates are: /usr/include/wx-2.8/wx/string.h:692:3: note: wxString::wxString(wxChar, size_t) /usr/include/wx-2.8/wx/string.h:692:3: note: no known conversion for argument 1 from ‘const char [17]’ to ‘wxChar {aka wchar_t}’ /usr/include/wx-2.8/wx/string.h:682:3: note: wxString::wxString(int) /usr/include/wx-2.8/wx/string.h:682:3: note: no known conversion for argument 1 from ‘const char [17]’ to ‘int’ /usr/include/wx-2.8/wx/menu.h:62:17: error: initializing argument 2 of ‘wxMenuItem* wxMenuBase::Append(int, const wxString&, const wxString&, wxItemKind)’ hello.cpp:49:40: error: conversion from ‘const char [6]’ to ‘const wxString’ is ambiguous hello.cpp:49:40: note: candidates are: /usr/include/wx-2.8/wx/string.h:692:3: note: wxString::wxString(wxChar, size_t) /usr/include/wx-2.8/wx/string.h:692:3: note: no known conversion for argument 1 from ‘const char [17]’ to ‘wxChar {aka wchar_t}’ /usr/include/wx-2.8/wx/string.h:682:3: note: wxString::wxString(int) /usr/include/wx-2.8/wx/string.h:682:3: note: no known conversion for argument 1 from ‘const char [17]’ to ‘int’ /usr/include/wx-2.8/wx/menu.h:62:17: error: initializing argument 2 of ‘wxMenuItem* wxMenuBase::Append(int, const wxString&, const wxString&, wxItemKind)’ hello.cpp:49:40: error: conversion from ‘const char [6]’ to ‘const wxString’ is ambiguous hello.cpp:49:40: note: candidates are: /usr/include/wx-2.8/wx/string.h:692:3: note: wxString::wxString(wxChar, size_t) hello.cpp:20:27: error: ISO C++ forbids declaration of ‘wxDECLARE_EVENT_TABLE’ with no type [-fpermissive] hello.cpp:27:5: error: expected constructor, destructor, or type conversion before ‘wxEventTableEntry’ hello.cpp: In member function ‘virtual bool MyApp::OnInit()’: hello.cpp:34:84: error: conversion from ‘const char [12]’ to ‘const wxString’ is ambiguous hello.cpp:34:84: note: candidates are: /usr/include/wx-2.8/wx/string.h:692:3: note: wxString::wxString(wxChar, size_t) /usr/include/wx-2.8/wx/string.h:692:3: note: no known conversion for argument 1 from ‘const char [12]’ to ‘wxChar {aka wchar_t}’ /usr/include/wx-2.8/wx/string.h:682:3: note: wxString::wxString(int) /usr/include/wx-2.8/wx/string.h:682:3: note: no known conversion for argument 1 from ‘const char [12]’ to ‘int’ hello.cpp:15:5: error: initializing argument 1 of ‘MyFrame::MyFrame(const wxString&, const wxPoint&, const wxSize&)’ hello.cpp: In constructor ‘MyFrame::MyFrame(const wxString&, const wxPoint&, const wxSize&)’: hello.cpp:43:74: error: conversion from ‘const char [17]’ to ‘const wxString’ is ambiguous hello.cpp:43:74: note: candidates are: /usr/include/wx-2.8/wx/string.h:692:3: note: wxString::wxString(wxChar, size_t) /usr/include/wx-2.8/wx/string.h:692:3: note: no known conversion for argument 1 from ‘const char [17]’ to ‘wxChar {aka wchar_t}’ /usr/include/wx-2.8/wx/string.h:682:3: note: wxString::wxString(int) /usr/include/wx-2.8/wx/string.h:682:3: note: no known conversion for argument 1 from ‘const char [17]’ to ‘int’ /usr/include/wx-2.8/wx/menu.h:62:17: error: initializing argument 2 of ‘wxMenuItem* wxMenuBase::Append(int, const wxString&, const wxString&, wxItemKind)’ hello.cpp:49:40: error: conversion from ‘const char [6]’ to ‘const wxString’ is ambiguous hello.cpp:49:40: note: candidates are: /usr/include/wx-2.8/wx/string.h:692:3: note: wxString::wxString(wxChar, size_t) /usr/include/wx-2.8/wx/string.h:692:3: note: no known conversion for argument 1 from ‘const char [6]’ to ‘wxChar {aka wchar_t}’ /usr/include/wx-2.8/wx/string.h:682:3: note: wxString::wxString(int) /usr/include/wx-2.8/wx/string.h:682:3: note: no known conversion for argument 1 from ‘const char [6]’ to ‘int’ /usr/include/wx-2.8/wx/gtk/menu.h:27:18: error: initializing argument 2 of ‘virtual bool wxMenuBar::Append(wxMenu*, const wxString&)’ hello.cpp:50:40: error: conversion from ‘const char [6]’ to ‘const wxString’ is ambiguous hello.cpp:50:40: note: candidates are: /usr/include/wx-2.8/wx/string.h:692:3: note: wxString::wxString(wxChar, size_t) /usr/include/wx-2.8/wx/string.h:692:3: note: no known conversion for argument 1 from ‘const char [6]’ to ‘wxChar {aka wchar_t}’ /usr/include/wx-2.8/wx/string.h:682:3: note: wxString::wxString(int) /usr/include/wx-2.8/wx/string.h:682:3: note: no known conversion for argument 1 from ‘const char [6]’ to ‘int’ /usr/include/wx-2.8/wx/gtk/menu.h:27:18: error: initializing argument 2 of ‘virtual bool wxMenuBar::Append(wxMenu*, const wxString&)’ hello.cpp:53:44: error: conversion from ‘const char [22]’ to ‘const wxString’ is ambiguous hello.cpp:53:44: note: candidates are: /usr/include/wx-2.8/wx/string.h:692:3: note: wxString::wxString(wxChar, size_t) /usr/include/wx-2.8/wx/string.h:692:3: note: no known conversion for argument 1 from ‘const char [22]’ to ‘wxChar {aka wchar_t}’ /usr/include/wx-2.8/wx/string.h:682:3: note: wxString::wxString(int) /usr/include/wx-2.8/wx/string.h:682:3: note: no known conversion for argument 1 from ‘const char [22]’ to ‘int’ /usr/include/wx-2.8/wx/frame.h:110:18: error: initializing argument 1 of ‘virtual void wxFrameBase::SetStatusText(const wxString&, int)’ hello.cpp: In member function ‘void MyFrame::OnAbout(wxCommandEvent&)’: hello.cpp:62:66: error: conversion from ‘const char [40]’ to ‘const wxString’ is ambiguous hello.cpp:62:66: note: candidates are: /usr/include/wx-2.8/wx/string.h:692:3: note: wxString::wxString(wxChar, size_t) /usr/include/wx-2.8/wx/string.h:692:3: note: no known conversion for argument 1 from ‘const char [40]’ to ‘wxChar {aka wchar_t}’ /usr/include/wx-2.8/wx/string.h:682:3: note: wxString::wxString(int) /usr/include/wx-2.8/wx/string.h:682:3: note: no known conversion for argument 1 from ‘const char [40]’ to ‘int’ /usr/include/wx-2.8/wx/msgdlg.h:70:17: error: initializing argument 1 of ‘int wxMessageBox(const wxString&, const wxString&, long int, wxWindow*, int, int)’ hello.cpp: In member function ‘void MyFrame::OnHello(wxCommandEvent&)’: hello.cpp:66:47: error: cannot convert ‘const char*’ to ‘const wxChar* {aka const wchar_t*}’ for argument ‘1’ to ‘void wxLogMessage(const wxChar*, ...)’
It seems that the issues around converting from char*
types to wxString
types. Is there any way to resolve this? It seems strange that an official example would have all these errors, am I compiling it properly?