3

使用 Microsoft Visual C++ 我正在尝试编译文件“test.cc”，它是一个小包的一部分，可在以下位置免费下载

http://sourceforge.net/projects/clippoly/files/

文件 test.cc 如下所示：

//    nclip: a polygon clip library

//    Copyright (C) 1993  University of Twente

//    klamer@mi.el.utwente.nl

//    This library is free software; you can redistribute it and/or
//    modify it under the terms of the GNU Library General Public
//    License as published by the Free Software Foundation; either
//    version 2 of the License, or (at your option) any later version.

//    This library is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//    Library General Public License for more details.

//    You should have received a copy of the GNU Library General Public
//    License along with this library; if not, write to the Free
//    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

#include <cstring>
#include <iostream>

#include "poly.h"
#include "poly_io.h"
#include "nclip.h"

using namespace ::std;

void
clear(PolyPList &l)
{
    PolyPListIter i(l);
    while(i())
        delete i.val();
}

int
main(int, char *[])
{
    Poly *a = read_poly(cin), *b = read_poly(cin);
    PolyPList a_min_b, b_min_a, a_and_b;

    clip_poly( *a, *b, a_min_b, b_min_a, a_and_b );

    cout << "a_min_b:\n" << a_min_b;
    cout << "b_min_a:\n" << b_min_a;
    cout << "a_and_b:\n" << a_and_b;

    delete  a;
    delete  b;

    clear(a_min_b);
    clear(b_min_a);
    clear(a_and_b);

    return 0;
}

测试文件旨在演示计算两个输入多边形的交集。

我在“项目->属性->VC++目录->包含目录”中包含了必要头文件的路径，编译器识别出“poly.h”、“poly_io.h”和“nclip.h”的存在。

但是，当我尝试编译时，出现以下链接器错误：

test.obj : 错误 LNK2019:函数标量删除析构函数'(unsigned int)"` (??_GPolyNode@@AAEPAXI@Z)"private: __thiscall PolyNode::~PolyNode(void)"中引用的未解析外部符号 (??1PolyNode@@AAE@XZ )"private: void * __thiscall PolyNode::

test.obj：错误 LNK2019：引用了未解析的外部符号"class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl operator<<(class std::basic_ostream<char,struct std::char_traits<char> > &,class Set<class Poly *> const &)"(??6@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@std@@AAV01@ABV?$Set@PAVPoly@@@@@Z)在功能上_main

test.obj：错误 LNK2019：函数中引用"void __cdecl clip_poly(class Poly const &,class Poly const &,class Set<class Poly *> &,class Set<class Poly *> &,class Set<class Poly *> &)"了未解析的外部符号 (?clip_poly@@YAXABVPoly@@0AAV?$Set@PAVPoly@@@@11@Z)_main

test.obj：错误 LNK2019：函数中引用了未解析的外部符号"class Poly * __cdecl read_poly(class std::basic_istream<char,struct std::char_traits<char> > &)"(?read_poly@@YAPAVPoly@@AAV?$basic_istream@DU?$char_traits@D@std@@@std@@@Z)_main

我究竟做错了什么？我试图在“项目->属性”下的所有地方添加路径。但现在我不知所措。

我希望这对某人来说是一个相当简单的问题:)

4

1 回答 1

3

看起来好像您已经告诉编译器头文件在哪里，但没有告诉链接器在哪里可以找到包含Poly该类的库。

我面前没有 Visual Studio，因此通过界面的以下路线可能不会出现，但是从内存中，您需要通过 Project->Properties->Linker->Input-> 添加库（.lib）附加依赖项。

于 2011-10-19T21:49:11.767 回答