主页 / 问题 / 969741
Accepted
shaman888
Asked:2020-04-15 12:37:02 +0000 UTC2020-04-15 12:37:02 +0000 UTC

未定义对“Magick::Image::Image()”的引用

  • 772

告诉我缺少什么？

主文件

#include <iostream>
#include "image.h"
#include <Magick++.h>

using namespace std;
using namespace Magick;

int main(int argc,char **argv)
{
    Magick::InitializeMagick(*argv);
    Magick::Image image;
      try {
        // Read a file into image object
        image.read( "girl.gif" );

        // Crop the image to specified size (width, height, xOffset, yOffset)
        image.crop( Geometry(100,100, 100, 100) );

        // Write the image to a file
        image.write( "x.gif" );
      }
      catch( Exception &error_ )
        {
          cout << "Caught exception: " << error_.what() << endl;
          return 1;
        }
    return 0;
}

图像.cpp

#include "image.h"
#include <Magick++.h>

Image::Image()
{

}

图像.h

#ifndef IMAGE_H
#define IMAGE_H
#include <vector>
using namespace std;

class Image
{
public:
    Image();



};

#endif // IMAGE_H

CMakeLists.txt c

make_minimum_required(VERSION 3.5)

project(IimageReadObj)
###add_executable(${PROJECT_NAME} "main.cpp")

find_program(MAGICK_CONFIG "Magick++-config")
# Ask about CXX and lib flags/locations
execute_process(COMMAND "${MAGICK_CONFIG}" "--cxxflags" OUTPUT_VARIABLE MAGICK_CXX_FLAGS)
execute_process(COMMAND "${MAGICK_CONFIG}" "--libs" OUTPUT_VARIABLE MAGICK_LD_FLAGS)
# Remove trailing whitespace (CMAKE warns about this)
string(STRIP "${MAGICK_CXX_FLAGS}" MAGICK_CXX_FLAGS)
string(STRIP "${MAGICK_LD_FLAGS}" MAGICK_LD_FLAGS)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 ${MAGICK_CXX_FLAGS} ${MAGICK_LD_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall ")


# Create a list with all .cpp source files
set( project_sources
   main.cpp
   image.cpp
)

# Create executable with all necessary source files
add_executable(${PROJECT_NAME}
  ${project_sources}
)

find_package(ImageMagick COMPONENTS Magick++)
include_directories(${ImageMagick_INCLUDE_DIRS})

/home/alexandr/programming/IimageReadObj/IimageReadObj/main.cpp:10：错误：未定义引用Magick::InitializeMagick(char const*)' /home/alexandr/programming/IimageReadObj/IimageReadObj/main.cpp:11: ошибка: undefined reference toMagick::Image::Image()' /home/alexandr/programming/IimageReadObj/IimageReadObj/main.cpp:14：错误: 未定义对 Magick::Image::read(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' /home/alexandr/programming/IimageReadObj/IimageReadObj/main.cpp:17: ошибка: undefined reference toMagick::Geometry::Geometry(unsigned long, unsigned long, long, long, bool, bool)' /home/alexandr/programming/IimageReadObj/IimageReadObj/main.cpp:17 的引用：错误：未定义对Magick::Image::crop(Magick::Geometry const&)' /home/alexandr/programming/IimageReadObj/IimageReadObj/main.cpp:17: ошибка: undefined reference toMagick的引用::Geometry::~Geometry()' /home/alexandr/programming/IimageReadObj/IimageReadObj/main.cpp:20: 错误：未定义对 Magick::Image::write(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' /home/alexandr/programming/IimageReadObj/IimageReadObj/main.cpp:11: ошибка: undefined reference toMagick::Image::~Image()' /home/alexandr/programming/ 的引用IimageReadObj/IimageReadObj/main.cpp:17：错误：未定义的引用Magick::Geometry::~Geometry()' /home/alexandr/programming/IimageReadObj/IimageReadObj/main.cpp:11: ошибка: undefined reference toMagick::Image::~Image()' /home/alexandr/programming/IimageReadObj/build-IimageReadObj-Desktop_Qt_5_12_0_GCC_64bit-u0412u044bu043fu0443u0441u043a/CMakeFiles/IimagetypeReadObj.dir/main.cpp.o:-1: 错误：未定义对`的引用Magick::Exception' :-1: error: collect2: error: ld returned 1 exit status

c++

1 个回答

  1. Best Answer

    这就是您在全局命名空间中声明的方式。

    using namespace std;
class Image
{
public:
...
};

    你需要像这样使用它：

    using namespace std;
using namespace Magick;

int main(int argc,char **argv)
{
::Image image;
}

    如果你想在不同的空间定义一个类，那么你应该这样写。

    namespace Magick {
class Image
    {
    public:
    ...
    };
}
    • 1

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