cpp_example.obj：错误LNK2001：未解析的外部符号_IpoptApplicationFactory [英] cpp_example.obj : error LNK2001: unresolved external symbol _IpoptApplicationFactory

问题描述

Hello

我正在尝试使用IPOPT.dll运行一个示例，但我一直收到此链接错误。

I am trying to run an example using IPOPT.dll but i keep getting this link error.

cpp_example。 obj：错误LNK2001：未解析的外部符号_IpoptApplicationFactory

cpp_example.obj : error LNK2001: unresolved external symbol _IpoptApplicationFactory

我已将附加依赖项中的IpOpt-vc10.lib与VC ++目录中include目录中的include（头文件）相链接。

I have linked the IpOpt-vc10.lib in the Additional Dependencies and the include (header files ) in the include directories in VC++directories.

//cpp_example.cpp

#include "IpIpoptApplication.hpp"
#include "IpSolveStatistics.hpp"
#include "MyNLP.hpp"

#include <iostream>

using namespace Ipopt;



 int main(int argv, char* argc[])
{
  // Create an instance of your nlp...
  SmartPtr<TNLP> mynlp = new MyNLP();

  // Create an instance of the IpoptApplication
  //
  // We are using the factory, since this allows us to compile this
  // example with an Ipopt Windows DLL
 
SmartPtr<IpoptApplication> app =  IpoptApplicationFactory();

  // Initialize the IpoptApplication and process the options
  ApplicationReturnStatus status;
  status = app->Initialize();
  if (status != Solve_Succeeded) {
    std::cout << std::endl << std::endl << "*** Error during initialization!" << std::endl;
    return (int) status;
  }

  status = app->OptimizeTNLP(mynlp);

  if (status == Solve_Succeeded) {
    // Retrieve some statistics about the solve
    Index iter_count = app->Statistics()->IterationCount();
    std::cout << std::endl << std::endl << "*** The problem solved in " << iter_count << " iterations!" << std::endl;

    Number final_obj = app->Statistics()->FinalObjective();
    std::cout << std::endl << std::endl << "*** The final value of the objective function is " << final_obj << '.' << std::endl;
  }

  return (int) status;
}

任何指导都将不胜感激。

Any guidance would be appreciated.

提前致谢。

推荐答案

你好pavithrasekar11，

Hi pavithrasekar11,

感谢您在这里发帖。

>> cpp_example.obj：错误LNK2001：未解析的外部符号_IpoptApplicationFactory

>>cpp_example.obj : error LNK2001: unresolved external symbol _IpoptApplicationFactory

看来你在不使用
extern "C"的情况下从C ++程序调用C函数。 （这会导致编译器使用C命名约定）可能导致LNK2001。

It seems that you're calling a C function from a C++ program without using extern "C" (which causes the compiler to use the C naming convention) can cause LNK2001.

编译器选项
/ Tp 和
< span style ="color：＃0066cc"> / Tc 使编译器分别将文件编译为C ++或C，而不管文件扩展名是什么。这些选项可能导致函数名称与您的预期不同。

Compiler options /Tp and /Tc cause the compiler to compile files as C++ or C, respectively, regardless of the filename extension. These options can cause function names different from what you expect.

由于其他可能的原因，请参阅下面的文档。

For other possible reasons, please refer to this document below.

https://msdn.microsoft.com/en-us/library/f6xx1b1z.aspx

希望这可以帮助你。

最好的问候，

Sera Yu

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