[英]How to fix the FLTK header files from 'Programmin principles and practice Using C++' book?
我遵循“使用C ++编程原则和实践”并进入第12章,其中介绍了GUI。 但是我无法从书中获取自定义头文件。 在尝试了几本专门为本书安装fltk的指南之后,我对本指南进行了最深入的研究: https ://bumpyroadtocode.com/2017/08/05/how-to-install-and-use-fltk-1-3-4 -in-视觉工作室2017年完成引导/#评论
我对头文件进行了相同的更改,因为它们消除了大部分错误,但不是全部错误。 在Simple_window.h和Simple_window.cpp中注释掉一些重复声明后,我只剩下7个错误。 但由于我是C ++的新手(否则我可能不会读这本书)我无法摆脱最后几个错误:(
这些是错误:
Severity Code Description Project File Line Suppression State
Error LNK2005 "void __cdecl seed_randint(int)" (?seed_randint@@YAXH@Z) already defined in Graph.obj Programming Principles and Practice Using C++ C:\Users\CM Storm i7\source\repos\Programming Principles and Practice Using C++\Programming Principles and Practice Using C++\Window.obj 1
Error LNK2005 "class std::mersenne_twister_engine<unsigned int,32,624,397,31,2567483615,11,4294967295,7,2636928640,15,4022730752,18,1812433253> & __cdecl get_rand(void)" (?get_rand@@YAAAV?$mersenne_twister_engine@I$0CA@$0CHA@$0BIN@$0BP@$0JJAILANP@$0L@$0PPPPPPPP@$06$0JNCMFGIA@$0P@$0OPMGAAAA@$0BC@$0GMAHIJGF@@std@@XZ) already defined in Graph.obj Programming Principles and Practice Using C++ C:\Users\CM Storm i7\source\repos\Programming Principles and Practice Using C++\Programming Principles and Practice Using C++\GUI.obj 1
Error LNK2005 "class std::mersenne_twister_engine<unsigned int,32,624,397,31,2567483615,11,4294967295,7,2636928640,15,4022730752,18,1812433253> & __cdecl get_rand(void)" (?get_rand@@YAAAV?$mersenne_twister_engine@I$0CA@$0CHA@$0BIN@$0BP@$0JJAILANP@$0L@$0PPPPPPPP@$06$0JNCMFGIA@$0P@$0OPMGAAAA@$0BC@$0GMAHIJGF@@std@@XZ) already defined in Graph.obj Programming Principles and Practice Using C++ C:\Users\CM Storm i7\source\repos\Programming Principles and Practice Using C++\Programming Principles and Practice Using C++\Simple_window.obj 1
Error LNK2005 "class std::mersenne_twister_engine<unsigned int,32,624,397,31,2567483615,11,4294967295,7,2636928640,15,4022730752,18,1812433253> & __cdecl get_rand(void)" (?get_rand@@YAAAV?$mersenne_twister_engine@I$0CA@$0CHA@$0BIN@$0BP@$0JJAILANP@$0L@$0PPPPPPPP@$06$0JNCMFGIA@$0P@$0OPMGAAAA@$0BC@$0GMAHIJGF@@std@@XZ) already defined in Graph.obj Programming Principles and Practice Using C++ C:\Users\CM Storm i7\source\repos\Programming Principles and Practice Using C++\Programming Principles and Practice Using C++\Window.obj 1
Error LNK2005 "void __cdecl seed_randint(int)" (?seed_randint@@YAXH@Z) already defined in Graph.obj Programming Principles and Practice Using C++ C:\Users\CM Storm i7\source\repos\Programming Principles and Practice Using C++\Programming Principles and Practice Using C++\GUI.obj 1
Error LNK2005 "void __cdecl seed_randint(int)" (?seed_randint@@YAXH@Z) already defined in Graph.obj Programming Principles and Practice Using C++ C:\Users\CM Storm i7\source\repos\Programming Principles and Practice Using C++\Programming Principles and Practice Using C++\Simple_window.obj 1
Error LNK1169 one or more multiply defined symbols found Programming Principles and Practice Using C++ C:\Users\CM Storm i7\source\repos\Programming Principles and Practice Using C++\Debug\Programming Principles and Practice Using C++.exe 1
这是Simple_window.h:
#include "GUI.h" // for Simple_window only (doesn't really belong in Window.h)
using namespace Graph_lib;
// Simple_window is basic scaffolding for ultra-simple interaction with graphics
// it provides one window with one "next" button for ultra-simple animation
struct Simple_window : Graph_lib::Window {
Simple_window(Point xy, int w, int h, const string& title);
/*
: Window(xy, w, h, title),
button_pushed(false),
next_button(Point(x_max() - 70, 0), 70, 20, "Next", cb_next) {
attach(next_button);
}
*/
bool wait_for_button();
// modified event loop
// handle all events (as per default), but quit when button_pushed becomes true
// this allows graphics without control inversion
/*
{
while (!button_pushed) Fl::wait();
button_pushed = false;
Fl::redraw();
}
*/
Button next_button;
private:
bool button_pushed;
static void cb_next(Address, Address addr); // callback for next_button
// { reference_to<Simple_window>(addr).next(); }
/*
{
static_cast<Simple_window*>(addr)->next();
}
*/
void next(); //{ button_pushed = true; }
};
最后这是Simple_window.cpp:
//
// This is a GUI support code to the chapters 12-16 of the book
// "Programming -- Principles and Practice Using C++" by Bjarne Stroustrup
//
#include "Simple_window.h"
//------------------------------------------------------------------------------
Simple_window::Simple_window(Point xy, int w, int h, const string& title) :
Window(xy, w, h, title),
next_button(Point(x_max() - 70, 0), 70, 20, "Next", cb_next),
button_pushed(false)
{
attach(next_button);
}
//------------------------------------------------------------------------------
bool Simple_window::wait_for_button()
// modified event loop:
// handle all events (as per default), quit when button_pushed becomes true
// this allows graphics without control inversion
{
show();
button_pushed = false;
#if 1
// Simpler handler
while (!button_pushed) Fl::wait();
Fl::redraw();
#else
// To handle the case where the user presses the X button in the window frame
// to kill the application, change the condition to 0 to enable this branch.
Fl::run();
#endif
return button_pushed;
}
//------------------------------------------------------------------------------
void Simple_window::cb_next(Address, Address pw)
// call Simple_window::next() for the window located at pw
{
reference_to<Simple_window>(pw).next();
}
//------------------------------------------------------------------------------
void Simple_window::next()
{
button_pushed = true;
hide();
}
//------------------------------------------------------------------------------
有两种方法可以解决这个问题,虽然不知道,这通常更好:
1)在“std_lib_facilities.h”第218-228行中注释掉随机数生成器
要么
2)项目 - Properities - 链接器 - 所有选项 - 附加选项=>编辑和添加/ FORCE:MULTIPLE
两者都适合我,也希望你。
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