Symbols not found in architecture x86_64
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ERROR OUTPUT IN APPLICATION:
:-1: error: symbol(s) not found for architecture x86_64:-
1: error: linker command failed with exit code 1 (use -v to see invocation)Im desperately trying to get my code running this is an integration with openCV , could someone please help explain these errors to me or why my code doesn't work? thanks in advance; I'm using opencv 3.1.0
#include "mainwindow.h" #include <QApplication> #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <opencv2/videoio/videoio.hpp> #include<opencv2/objdetect/objdetect.hpp> #include<opencv2/imgproc/imgproc.hpp> #include<vector> #include<string> #include <iostream> #include<stdio.h> using namespace cv; using namespace std; CascadeClassifier face_cascade; void detectFaces(Mat frame) { vector<Rect> faces; Mat frame_gray; cvtColor(frame, frame_gray, COLOR_BGR2GRAY); // Convert to gray scale equalizeHist(frame_gray, frame_gray); // Equalize histogram // Detect faces face_cascade.detectMultiScale(frame_gray, faces, 1.1, 3, 0|CASCADE_SCALE_IMAGE, Size(30, 30)); // Iterate over all of the faces for( size_t i = 0; i < faces.size(); i++ ) { // Find center of faces Point center(faces[i].x + faces[i].width/2, faces[i].y + faces[i].height/2); // Draw ellipse around face ellipse(frame, center, Size(faces[i].width/2, faces[i].height/2), 0, 0, 360, Scalar( 255, 0, 255 ), 4, 8, 0 ); } imshow( "window",frame); // Display frame } int main(int argc, char *argv[]){ QApplication a(argc, argv); MainWindow w; // cam code try{ VideoCapture cap(0); // Open default camera Mat frame; // Load preconstructed classifier face_cascade.load("haarcascade_frontalface_alt.xml"); while(cap.read(frame)) { detectFaces(frame); // Call function to detect faces if( waitKey(30) >= 0) // Pause key break; } }catch(Exception ex){ std::cout << "Unable to initiate camera" << std::endl; } //end cam code w.show(); return a.exec(); }
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Hi,
What symbols are missing ?
Are you sure you have linked to all the necessary libs ?
Are they of the correct architecture ?
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This is my PRO file below, thanks for your reply; Im not quite sure i really don't understand whats going on, I have been able to get the live camera feed from my code but when implementing the face detection in openCV I am getting this issue .pro file as follows:
#------------------------------------------------- # # Project created by QtCreator 2016-05-25T01:38:34 # #------------------------------------------------- QT += core gui greaterThan(QT_MAJOR_VERSION, 4): QT += widgets TARGET = Origin TEMPLATE = app SOURCES += main.cpp\ mainwindow.cpp LIBS += \ -L/usr/local/lib \ -lopencv_core \ -lopencv_highgui \ -lopencv_videoio \ -lopencv_objdetect INCLUDEPATH += \ /usr/local/include HEADERS += mainwindow.h FORMS += mainwindow.ui
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Looks fine but again: what symbols are missing ?
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Symbols in what context? Im fairly new to Qt apologies for being a little slow in advance but this is my compile output:
If you are asking a specific question ill gladly get the info needed if you could just show me where i can find this, thanks again for your help16:32:52: Running steps for project Origin... 16:32:52: Configuration unchanged, skipping qmake step. 16:32:52: Starting: "/usr/bin/make" /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -c -pipe -stdlib=libc++ -g -std=gnu++11 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -mmacosx-version-min=10.7 -Wall -W -fPIC -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../Origin -I. -I/usr/local/include -I../../Qt/5.6/clang_64/lib/QtWidgets.framework/Headers -I../../Qt/5.6/clang_64/lib/QtGui.framework/Headers -I../../Qt/5.6/clang_64/lib/QtCore.framework/Headers -I. -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/System/Library/Frameworks/AGL.framework/Headers -I. -I../../Qt/5.6/clang_64/mkspecs/macx-clang -F/Users/travishaycock/Qt/5.6/clang_64/lib -o main.o ../Origin/main.cpp /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -headerpad_max_install_names -stdlib=libc++ -Wl,-syslibroot,/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -mmacosx-version-min=10.7 -Wl,-rpath,/Users/travishaycock/Qt/5.6/clang_64/lib -o Origin.app/Contents/MacOS/Origin main.o mainwindow.o moc_mainwindow.o -F/Users/travishaycock/Qt/5.6/clang_64/lib -L/usr/local/lib -lopencv_core -lopencv_highgui -lopencv_videoio -lopencv_objdetect -framework QtWidgets -framework QtGui -framework QtCore -framework OpenGL -framework AGL Undefined symbols for architecture x86_64: "cv::equalizeHist(cv::_InputArray const&, cv::_OutputArray const&)", referenced from: detectFaces(cv::Mat) in main.o "cv::ellipse(cv::_InputOutputArray const&, cv::Point_<int>, cv::Size_<int>, double, double, double, cv::Scalar_<double> const&, int, int, int)", referenced from: detectFaces(cv::Mat) in main.o "cv::cvtColor(cv::_InputArray const&, cv::_OutputArray const&, int, int)", referenced from: detectFaces(cv::Mat) in main.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [Origin.app/Contents/MacOS/Origin] Error 1 16:32:55: The process "/usr/bin/make" exited with code 2. Error while building/deploying project Origin (kit: Desktop Qt 5.6.0 clang 64bit) When executing step "Make" 16:32:55: Elapsed time: 00:03.
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That's nothing Qt specific, it's standard C++.
You are not linking to the OpenCV module that provides these symbols. For example equalizeHist comes from imgproc
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