C++ openCV 错误：未定义对 `cvLoadImage' Ubuntu 的引用
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openCV error : undefined reference to `cvLoadImage' Ubuntu
提问by user1111044
I have installed the openCV libraries but I am still getting the error
$ g++ -I /usr/include/opencv/ -L -lcxcore -lhighgui hello.cpp -o hello
/tmp/ccjjrbXr.o: In function main':
hello.cpp:(.text+0x2d): undefined reference tocvLoadImage'
collect2: ld returned 1 exit status
我已经安装了 openCV 库，但仍然出现错误
$ g++ -I /usr/include/opencv/ -L -lcxcore -lhighgui hello.cpp -o hello
/tmp/ccjjrbXr.o: In function
cvLoadImage main':
hello.cpp:(.text+0x2d): undefined reference to'
collect2: ld返回 1 个退出状态
When I check for the path of the libraries I get
$ pkg-config --libs opencv
-lml -lcvaux -lhighgui -lcv -lcxcore
当我检查库的路径时，我得到
$ pkg-config --libs opencv
-lml -lcvaux -lhighgui -lcv -lcxcore
I have written a very simple program to test it :
我写了一个非常简单的程序来测试它：
enter code here
#include< cv.h>
#include< highgui.h> /* required to use OpenCV's highgui */
#include< stdio.h>
int main() {
IplImage* img = 0;
printf("Hello\n");
img = cvLoadImage("lena.jpg", 0 );
}
There is something wrong with my installation but I am really not able to figure it out. Any guidance will be highly appreciated! Thanks
我的安装有问题，但我真的无法弄清楚。任何指导将不胜感激！谢谢
When I run:
当我运行时：
$ pkg-config --cflags --libs opencv
-I/usr/local/include/opencv -I/usr/local/include
/usr/local/lib/libopencv_calib3d.so /usr/local/lib/libopencv_contrib.so
/usr/local/lib/libopencv_core.so /usr/local/lib/libopencv_features2d.so
/usr/local/lib/libopencv_flann.so /usr/local/lib/libopencv_gpu.so
/usr/local/lib/libopencv_highgui.so /usr/local/lib/libopencv_imgproc.so
/usr/local/lib/libopencv_legacy.so /usr/local/lib/libopencv_ml.so
/usr/local/lib/libopencv_nonfree.so /usr/local/lib/libopencv_objdetect.so
/usr/local/lib/libopencv_photo.so /usr/local/lib/libopencv_stitching.so
/usr/local/lib/libopencv_ts.so /usr/local/lib/libopencv_video.so
/usr/local/lib/libopencv_videostab.so
But when I run:
但是当我运行时：
$ g++ 'pkg-config --cflags --libs opencv' display_image.cpp
g++: error: pkg-config --cflags --libs opencv: No such file or directory
OpenCV seems to be installed but still the problem persists.
OpenCV 似乎已安装，但问题仍然存在。
回答by karlphillip
You used single quotes 'instead of backquotes/backticks`. This is the corrected command:
您使用了单引号'而不是反引号/反引号`。这是更正后的命令：
g++ hello.cpp -o hello `pkg-config --cflags --libs opencv`
回答by Martin Beckett
It would be a good idea to link to the highgui lib -lhighguiif you are using it
-lhighgui如果您正在使用它，最好链接到 highgui lib
回答by Alexis
this command:
这个命令：
g++ 'pkg-config --cflags --libs opencv' display_image.cpp
is different than this:
与此不同：
g++ `pkg-config --cflags --libs opencv` display_image.cpp
because of the ` and ' chars...
因为'和'字符......
if you dont want to mess with those chars, you can use
如果你不想弄乱这些字符，你可以使用
g++ $(pkg-config --cflags --libs opencv) display_image.cpp
which is easier to visualize
这更容易形象化
回答by user2652000
try g++ -g -o mypro progname.cpp pkg-config opencv --cflags --libsor
尝试 g++ -g -o mypro progname.cpppkg-config opencv --cflags --libs或
