Question

我正在尝试编译DLIB示例：http://dlib.net/image_ex.cpp.html 我一字一句地复制了它：

#include <dlib/gui_widgets.h>
#include <dlib/image_io.h>
#include <dlib/image_transforms.h>
#include <fstream>


using namespace std;
using namespace dlib;

//  ----------------------------------------------------------------------------

int main(int argc, char** argv)
{
    try
    {
        // make sure the user entered an argument to this program
        if (argc != 2)
        {
            cout << "error, you have to enter a BMP file as an argument to this program" << endl;
            return 1;
        }

我使用了这个命令：

g++ dlib1.cpp -o dlib1 -std=c++11 -O3 -I ~/Packages/dlib/ -lpthread -lX11 -ljpeg -lpng -DDLIB_JPEG_SUPPORT -DDLIB_PNG_SUPPORT

尽管这个命令在几个月前工作很好：[Can't include the JPEG_SUPPORT headers in a dlib cpp file]这次，它给了我数百个的错误：

dlibTest-0.cpp:(.text._ZNK4dlib10png_loader9get_imageINS_7array2dINS_9rgb_pixelENS_33memory_manager_stateless_kernel_1IcEEEEEEvRT_[_ZNK4dlib10png_loader9get_imageINS_7array2dINS_9rgb_pixelENS_33memory_manager_stateless_kernel_1IcEEEEEEvRT_]+0x7e): undefined reference to `dlib::png_loader::is_gray() const'
dlibTest-0.cpp:(.text._ZNK4dlib10png_loader9get_imageINS_7array2dINS_9rgb_pixelENS_33memory_manager_stateless_kernel_1IcEEEEEEvRT_[_ZNK4dlib10png_loader9get_imageINS_7array2dINS_9rgb_pixelENS_33memory_manager_stateless_kernel_1IcEEEEEEvRT_]+0x94): undefined reference to `dlib::png_loader::is_gray() const'
dlibTest-0.cpp:(.text._ZNK4dlib10png_loader9get_imageINS_7array2dINS_9rgb_pixelENS_33memory_manager_stateless_kernel_1IcEEEEEEvRT_[_ZNK4dlib10png_loader9get_imageINS_7array2dINS_9rgb_pixelENS_33memory_manager_stateless_kernel_1IcEEEEEEvRT_]+0xaa): undefined reference to `dlib::png_loader::is_graya() const'
dlibTest-0.cpp:(.text._ZNK4dlib10png_loader9get_imageINS_7array2dINS_9rgb_pixelENS_33memory_manager_stateless_kernel_1IcEEEEEEvRT_[_ZNK4dlib10png_loader9get_imageINS_7array2dINS_9rgb_pixelENS_33memory_manager_stateless_kernel_1IcEEEEEEvRT_]+0xd0): undefined reference to `dlib::png_loader::get_row(unsigned int) const'
dlibTest-0.cpp:(.text._ZNK4dlib10png_loader9get_imageINS_7array2dINS_9rgb_pixelENS_33memory_manager_stateless_kernel_1IcEEEEEEvRT_[_ZNK4dlib10png_loader9get_imageINS_7array2dINS_9rgb_pixelENS_33memory_manager_stateless_kernel_1IcEEEEEEvRT_]+0x176): undefined reference to `dlib::png_loader::get_row(unsigned int) const'
dlibTest-0.cpp:(.text._ZNK4dlib10png_loader9get_imageINS_7array2dINS_9rgb_pixelENS_33memory_manager_stateless_kernel_1IcEEEEEEvRT_[_ZNK4dlib10png_loader9get_imageINS_7array2dINS_9rgb_pixelENS_33memory_manager_stateless_kernel_1IcEEEEEEvRT_]+0x1ce): undefined reference to `dlib::png_loader::is_graya() const'

这到底出了什么问题？

Answer 1

某些示例需要命令行，例如......

g++ -std=c++11 -O3 -I.. ../dlib/all/source.cpp -lpthread -lX11 example_program_name.cpp

我猜source.cpp是一个“库作为cpp代码”link : dlib compile

尝试构建C ++ Dlib示例无法链接数百个未定义的引用错误

1 个答案: