编译MatIO时出现链接错误

Question

我已经使用提供的提示here构建了matio。但是当我尝试运行下面给出的代码时，出现以下错误：

/tmp/ccIrtdDv.o: In function `main': 
test.cpp:(.text+0x39): undefined reference to `Mat_Open' 
test.cpp:(.text+0xaa): undefined reference to `Mat_VarRead' 
test.cpp:(.text+0x20b): undefined reference to `Mat_VarRead' 
test.cpp:(.text+0x359): undefined reference to `Mat_VarRead' 
test.cpp:(.text+0x43c): undefined reference to `Mat_VarRead' 
test.cpp:(.text+0x51a): undefined reference to `Mat_Close' 
collect2: ld returned 1 exit status 

这是我编写的代码。

#include <iostream> 
#include <matio.h> 
#define tS(x) std::cout<<"\t"<<(#x)<<" == "<<(x)<<"\n" 
int main(int argc, char **argv) 
{ 
    const char *fileName = argc==1?"./S.mat":argv[1] ; 
    mat_t *mat = Mat_Open(fileName,MAT_ACC_RDONLY); 
    if(mat) 
    { 
     std::cout<<"Otwarto plik do odczytu\n\tmat == "<<mat<<"\n" ; 

     matvar_t *matVar=0 ; 
     std::cout<<"Wypisujemy dane\n\n" ; 
     std::cout<<"x:\n" ; 
     matVar = Mat_VarRead(mat, (char*)"x") ; 
     if(matVar) 
     { 
      unsigned xSize = matVar->nbytes/matVar->data_size ; 
      const double *xData = static_cast<const double*>(matVar->data) ; 
      for(int i=0; i<xSize; ++i) 
      { 
       std::cout<<"\tx["<<i<<"] = "<<xData[i]<<"\n" ; 
      } 
      std::cout<<"\n" ; 
      for(int i=0; i<matVar->rank; ++i) 
      { 
       std::cout<<"\tdim["<<i<<"] == "<<matVar->dims[i]<<"\n" ; 
      } 
     } 

     std::cout<<"y:\n" ; 
     matVar = Mat_VarRead(mat, (char*)"y") ; 
     unsigned ySize = matVar->nbytes/matVar->data_size ; 
     const double *yData = static_cast<const double*>(matVar->data) ; 
     for(int i=0; i<ySize; ++i) 
     { 
      double d = yData[i] ; 
      std::cout<<"\ty["<<i<<"] = "<<d<<"\n" ; 
     } 
     std::cout<<"\n" ; 
     for(int i=0; i<matVar->rank; ++i) 
     { 
      std::cout<<"\tdim["<<i<<"] == "<<matVar->dims[i]<<"\n" ; 
     } 

     std::cout<<"minX, step:\n"; 
     matVar = Mat_VarRead(mat, (char*)"minX") ; 
     const double *minXData = static_cast<const double*>(matVar->data) ; 
     std::cout<<"\tminX = "<<minXData[0]<<"\n" ; 
     std::cout<<"\n" ; 
     for(int i=0; i<matVar->rank; ++i) 
     { 
      std::cout<<"\tdim["<<i<<"] == "<<matVar->dims[i]<<"\n" ; 
     } 

     matVar = Mat_VarRead(mat, (char*)"step") ; 
     const double *stepData = static_cast<const double*>(matVar->data) ; 
     std::cout<<"\tstep = "<<stepData[0]<<"\n" ; 
     std::cout<<"\n" ; 
     for(int i=0; i<matVar->rank; ++i) 
     { 
      std::cout<<"\tdim["<<i<<"] == "<<matVar->dims[i]<<"\n" ; 
     } 

     Mat_Close(mat); 
    } 
    else 
    { 
     std::cout<<"Nie można otworzyć pliku\n" ; 
     return 1; 
    } 
    return 0; 
} 

我使用编译代码：

g++ -I/usr/include -L/usr/local/lib test.cpp -o test 

是否存在与安装一个问题，因为我只是跟着他们自述的步骤。如果没有，那我该如何解决它？提前致谢。

Answer 1

您应该指定-l选项。编译器不会扫描所有库以查找符号。 F/e：

g++ -I/usr/include -L/usr/local/lib -lmatio test.cpp -o test