wxWidgets Hello World 示例未编译

Question

我正在尝试学习wxWidgets框架，因为我被分配到一个已经使用该库的项目上工作。

我在 Raspberry Pi 上使用它，使用sudo apt-get install libwxgtk2.8-dev libwxgtk2.8-dbg安装它。

我在 wxWidgets 网站上找到了这个教程，并将其粘贴到我的 Pi 上一个名为 hello.cpp 的文件中。

然后我运行g++ hello.cpp -o hello wx-config --cxxflags --libs` 并且我收到以下巨大的错误消息：

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*, ...)’

似乎是从char*类型转换为wxString类型的问题。 有没有办法解决这个问题？ 官方示例会出现所有这些错误似乎很奇怪，我是否正确编译了它？

Answer 1

你链接到wxwidgets的trunk版本的文档。 在 wxstring 中，从 2.8 到 3.0 有一些变化。

见http://docs.wxwidgets.org/trunk/overview_changes_since28.html

因此，我建议您将此页面用于“Hello World”程序。 http://docs.wxwidgets.org/2.8.12/wx_helloworld.html#helloworld

我也建议您使用“g++”而不是“gcc”。 g++ 自动链接到 libstdc++。 g++ 和 gcc 有什么区别？