2011-09-26 39 views
0

我已经安装了OpenCV。 我已经能够编译一些代码,但有时它不起作用。下面的例子不起作用。OpenCV - 只使用g ++。不是gcc或nvcc

#include <iostream> 
#include "opencv2/opencv.hpp" 
#include "opencv2/gpu/gpu.hpp" 

int main (int argc, char* argv[]) 
{ 
    try 
    { 
     cv::Mat src_host = cv::imread("building.jpg", CV_LOAD_IMAGE_GRAYSCALE); 
     cv::gpu::GpuMat dst, src; 
     src.upload(src_host); 

     cv::gpu::threshold(src, dst, 128.0, 255.0, CV_THRESH_BINARY); 

     cv::Mat result_host = dst; 
     cv::imshow("Result", result_host); 
     cv::waitKey(); 
    } 
    catch(const cv::Exception& ex) 
    { 
     std::cout << "Error: " << ex.what() << std::endl; 
    } 
    return 0; 
} 

我收到以下错误,当我与

GCC Test.cpp的$(pkg配置--cflags --libs OpenCV的)

gcc Test.cpp $(pkg-config --cflags --libs opencv) 
Undefined symbols for architecture x86_64: 
"std::allocator<char>::allocator()", referenced from: 
    _main in ccnzUIww.o 
"std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)", referenced from: 
    _main in ccnzUIww.o 
"std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()", referenced from: 
    _main in ccnzUIww.o 
"std::terminate()", referenced from: 
    _main in ccnzUIww.o 
"std::allocator<char>::~allocator()", referenced from: 
    _main in ccnzUIww.o 
"cv::gpu::GpuMat::upload(cv::Mat const&)", referenced from: 
    _main in ccnzUIww.o 
"cv::gpu::Stream::Null()", referenced from: 
    _main in ccnzUIww.o 
"cv::gpu::threshold(cv::gpu::GpuMat const&, cv::gpu::GpuMat&, double, double, int, cv::gpu::Stream&)", referenced from: 
    _main in ccnzUIww.o 
"cv::gpu::GpuMat::operator cv::Mat() const", referenced from: 
    _main in ccnzUIww.o 
"___cxa_begin_catch", referenced from: 
    _main in ccnzUIww.o 
"std::cout", referenced from: 
    _main in ccnzUIww.o 
"std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)", referenced from: 
    _main in ccnzUIww.o 
"std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)", referenced from: 
    _main in ccnzUIww.o 
"std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))", referenced from: 
    _main in ccnzUIww.o 
"___cxa_end_catch", referenced from: 
    _main in ccnzUIww.o 
"std::ios_base::Init::Init()", referenced from: 
    __static_initialization_and_destruction_0(int, int)in ccnzUIww.o 
"std::ios_base::Init::~Init()", referenced from: 
    ___tcf_0 in ccnzUIww.o 
"cv::gpu::GpuMat::release()", referenced from: 
    cv::gpu::GpuMat::~GpuMat()in ccnzUIww.o 
"___gxx_personality_v0", referenced from: 
    Dwarf Exception Unwind Info (__eh_frame) in ccnzUIww.o 
ld: symbol(s) not found for architecture x86_64 
collect2: ld returned 1 exit status 

编译我自己也尝试:

  • GCC Test.cpp的$(pkg配置--cflags --libs OpenCV的)-m32
  • GCC Test.cpp的$(pkg配置--cflags --libs OpenCV的)-m64
  • NVCC Test.cpp的$(pkg配置--cflags --libs OpenCV的)

但是,这也给错误。我已经找到了stackoverflow上的答案,并发现这一点。 Compiling OpenCV CUDA program 在这个答案的解决方案是使用这个命令:

g++ Test.cpp `pkg-config --cflags --libs opencv` -lopencv_gpu 

和它的作品!我曾尝试给gcc和nvcc编译器提供相同的参数,但后来再次出现错误。这是一个问题,因为我需要使用nvcc编译器,因为我想在CUDA项目中使用OpenCV。

我有C和C++的小经验,所以有可能,这是明显的东西:)

+6

OpenCV的是C++,你的例子程序,绝对是C++,*不* C.它编译用C编译器没有意义。它可以用gcc来完成,但是它无缘无故地为你完成额外的工作。 – Flexo

+0

谢谢!但我需要使用nvcc编译器,因为将来我可以在该文件中添加一些CUDA代码。 –

+1

然后使用'nvcc'编译并'g ++'链接。 – Flexo

回答

6

用于编译和链接C代码,你应该使用gcc

用于编译和链接C++代码,你应该使用g++

尽管gcc通常可以正确地猜出用什么语言来编译文件,但它通常不能链接到所需的库。

+0

谢谢。这很明显。但是CUDA支持C++,为什么nvcc不检查这个。以及如何解决这个问题? ;) –

+0

@bobjink:我只能猜测,但我认为nvcc和gcc一样工作:它可以正确编译,但不能链接。所以你应该使用nvcc来编译('cc -c foo.cxx -o foo.o'),然后使用g ++来链接('g ++ -o app foo.o bar.o xxx.o') – PlasmaHH

+0

谢谢。现在我更了解它。我试过了: 1:nvcc -c Test.cpp -o Test.o 2:g ++ -o app Test.o'pkg-config --cflags --libs opencv' -lopencv_gpu但是出现错误:ld:warning:ignore文件Test.o,该文件是为i386而建立的,它不是被链接的架构(x86_64),所以我猜它不起作用。 –

0

我认为,这些命令将工作,因为它在我的电脑工作(Ubuntu的+ OpenCV的+的Eclipse)

huynhngoctan @ Ubuntu的:〜/工作区$ G ++ SiftDescriptor.cpp $(pkg配置--cflags - -libs OpenCV的)-lopencv_gpu

huynhngoctan @ Ubuntu的:〜/工作区$ ./a.out box.png box_in_scene.png