将Matlab与C ++链接时出错 [英] Error linking Matlab with C++

问题描述

  #include< cstdlib> 
 #include< cstdio> 
 #include< string.h> 
 #includeengine.h
 
 using namespace std; 
 
 
 int main（int argc，char ** argv）{
 Engine * mweng = engOpen（）; 
 engEvalString（mweng，n = func（5））; 
 printf（％d，engGetVariable（mweng，n））; 
 
 engClose（mweng）; 
返回0; 
} 
  

我使用g ++编译我的项目，包括 MATLABROOT \\ \\ extern \include 目录，并且出现以下错误：

  build / Debug / Cygwin-Windows / main.o：在函数`main'中：
 /cygdrive/d/Projects/Task1/main.cpp:10：对`_engOpen'的$ undefined引用
 / cygdrive / d / Projects / Task1 / main .cpp：11：对'_engEvalString'的未定义引用
 /cygdrive/d/Projects/Task1/main.cpp:12：未定义对'_engGetVariable'的引用
 / cygdrive / d / Projects / Task1 / main .cpp：14：未定义引用'_engClose'
 collect2：ld返回1退出状态$ b $ make [2]：*** [dist / Debug / Cygwin-Windows / task1.exe]错误1 
 make [1]：*** [.build-conf]错误2 
 make：*** [.build-impl]错误2 
  

我想我在连接一些Matlab库时遇到了问题。

更新：
我也有VS2012和windows编译器的问题。
目录 extern\include 包含到其他包含目录，与 extern相同\lib\win64\microsoft 添加到链接器其他库依赖项。
根据@jucestain评论，在链接器选项中添加到其他依赖项中的 libeng.lib 文件

更新2：
我们检测到兼容性问题：32位gcc不支持64位的Matlab引擎。因此，我将32位Matlab的 / extern 文件夹与我的 / extern 文件夹合并，将包含的链接程序库更改为 / extern / lib / win32 / lcc ，我的代码已经编译成功。感谢@aircooled！

解决方案

这是我在cygwin提示符下使用以获取main.exe的行：

  $ g ++ main.cpp -o main.exe -I / cygdrive / c / Program \ Files / MATLAB / R2009b / extern / include  - L / cygdrive / c / Program \ Files / MATLAB / R2009b / extern / lib / win32 / microsoft -llibeng 
  

请注意，为 gcc 提供源文件和库文件的顺序非常重要 - 首要来源，而非库文件。

I'm trying to use Matlab library in C++ program:

#include <cstdlib>
#include <cstdio>
#include <string.h>
#include "engine.h"

using namespace std;


int main(int argc, char** argv) {
    Engine* mweng = engOpen("");
    engEvalString(mweng, "n = func(5)");
    printf ("%d",engGetVariable(mweng, "n"));

    engClose(mweng);
    return 0;
}

I compile my project with g++ with included MATLABROOT\extern\include directory and have a following error:

build/Debug/Cygwin-Windows/main.o: In function `main':
/cygdrive/d/Projects/Task1/main.cpp:10: undefined reference to `_engOpen'
/cygdrive/d/Projects/Task1/main.cpp:11: undefined reference to `_engEvalString'
/cygdrive/d/Projects/Task1/main.cpp:12: undefined reference to `_engGetVariable'
/cygdrive/d/Projects/Task1/main.cpp:14: undefined reference to `_engClose'
collect2: ld returned 1 exit status
make[2]: *** [dist/Debug/Cygwin-Windows/task1.exe] Error 1
make[1]: *** [.build-conf] Error 2
make: *** [.build-impl] Error 2

I suppose I have problems with linking some Matlab libs.

UPDATE: I have same problem with VS2012 and windows compiler. Directory extern\include included to Additional include directories, same as extern\lib\win64\microsoft added to linker Additional library dependencies. According to @jucestain comment, the libeng.lib file added to Additional dependencies in linker options.

UPDATE 2: We detected a compatibility problem: 32-bit gcc doesn't work with 64-bit Matlab engine. So, I merged /extern folder from 32-bit Matlab with my /extern folder, changed included linker library to /extern/lib/win32/lcc, and my code has compiled successfully. Thanks to @aircooled!

解决方案

This is the line I use on my cygwin prompt to get main.exe:

$ g++ main.cpp -o main.exe -I/cygdrive/c/Program\ Files/MATLAB/R2009b/extern/include -L/cygdrive/c/Program\ Files/MATLAB/R2009b/extern/lib/win32/microsoft -llibeng

Note that order of giving sources and libs for gcc is important - first sources, than libs.

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