OpenCV 編譯錯誤 未定義的引用

opencv安裝完成也有一陣子了，我才用的是編譯安裝，環境ubuntu16.04 lts。今天有時間想自己寫一點程式，卻發現編譯不過

**如下，開啟命令列中輸入的檔名並展示在視窗中

// openpicture.cpp

#include "opencv2/highgui/highgui.hpp"
int main(int argc, char** argv)

/tmp/cczabtdo.o：在函式『main』中：

openpic.cpp:(.text+0x32)：對『cvloadimage』未定義的引用
openpic.cpp:(.text+0x45)：對『cvnamedwindow』未定義的引用
openpic.cpp:(.text+0x56)：對『cvshowimage』未定義的引用
openpic.cpp:(.text+0x60)：對『cvwaitkey』未定義的引用
openpic.cpp:(.text+0x6c)：對『cvreleaseimage』未定義的引用
openpic.cpp:(.text+0x76)：對『cvdestroywindow』未定義的引用
collect2: error: ld returned 1
exit status

opencv在ubuntu下是通過呼叫早已編譯好的動態鏈結庫.so檔案來生成程式的，通過g++ 的編譯控制選項也許可以制定編譯器的查詢路徑

下面貼幾條g++的命令幫助

-i add to

theend

ofthe main include path

-l lib-path dir

於是我進入系統的/usr/local/lib檔案，找到了一下檔名

libopencv_calib3d.so        libopencv_ml.so

.2.4
.13libopencv_calib3d.so
.2.4 libopencv_nonfree.so
libopencv_calib3d.so
.2.4
.13 libopencv_nonfree.so
.2.4
libopencv_contrib.so libopencv_nonfree.so
.2.4
.13libopencv_contrib.so
.2.4 libopencv_objdetect.so
libopencv_contrib.so
.2.4
.13 libopencv_objdetect.so
.2.4
libopencv_core.so libopencv_objdetect.so
.2.4
.13libopencv_core.so
.2.4 libopencv_ocl.so
libopencv_core.so
.2.4
.13 libopencv_ocl.so
.2.4
libopencv_features2d.so libopencv_ocl.so
.2.4
.13libopencv_features2d.so
.2.4 libopencv_photo.so
libopencv_features2d.so
.2.4
.13 libopencv_photo.so
.2.4
libopencv_flann.so libopencv_photo.so
.2.4
.13libopencv_flann.so
.2.4 libopencv_stitching.so
libopencv_flann.so
.2.4
.13 libopencv_stitching.so
.2.4
libopencv_gpu.so libopencv_stitching.so
.2.4
.13libopencv_gpu.so
.2.4 libopencv_superres.so
libopencv_gpu.so
.2.4
.13 libopencv_superres.so
.2.4
libopencv_highgui.so libopencv_superres.so
.2.4
.13libopencv_highgui.so
.2.4 libopencv_ts.a
libopencv_highgui.so
.2.4
.13 libopencv_video.so
libopencv_imgproc.so libopencv_video.so
.2.4
libopencv_imgproc.so
.2.4 libopencv_video.so
.2.4
.13libopencv_imgproc.so
.2.4
.13 libopencv_videostab.so
libopencv_legacy.so libopencv_videostab.so
.2.4
libopencv_legacy.so
.2.4 libopencv_videostab.so
.2.4
.13libopencv_legacy.so
.2.4
.13 pkgconfig
libopencv_ml.so python2.7
libopencv_ml.so
.2.4 python3.5

返回openpicture.cpp所在目錄，執行編譯命令

g++ -o openpicture openpicture.cpp -i /usr/local/include -i /usr/local/include/opencv -i /usr/local/include/opencv2 -l /usr/local/lib /usr/local/lib/*.so

./openpicture demo.jpg

不得不說opencv在ubuntu下其實用起來還是很麻煩的，或許使用makefile會更好管理一些

不過這個我現在還不會，下次再說吧～

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