CODEWITHSUNDEEP
c++eclipseopencvcompiler-errors
NDEthos
NDEthos

Reputation: 516

Eclipse giving "weird" error concerning opencv

I am running ubuntu 12.04. I have a c++ project that I wrote and compiled fine in Eclipse(the version before luna). I had some issues with my system and had to do a OS reinstall. Now I am using Eclipse luna and the project gives a strange error when using some of the openCV functionality.

The errors I am having occur when I use the cv::namedWindow() and the cv::imshow(). Errors are:

Here is eclipse console output:

00:21:45 **** Incremental Build of configuration Debug for project MySOM ****
make all 
Building target: MySOM
Invoking: Cross G++ Linker
g++ -L/usr/local/lib -o "MySOM"  ./src/LoadFile.o ./src/Model.o ./src/Node.o ./src/SOM.o ./src/main.o   -lopencv_calib3d -lopencv_contrib -lopencv_core -lopencv_features2d -lopencv_flann -lopencv_gpu -lopencv_highgui -lopencv_imgproc -lopencv_legacy -lopencv_ml -lopencv_nonfree -lopencv_objdetect -lopencv_ocl -lopencv_photo -lopencv_stitching -lopencv_superres -lopencv_ts -lopencv_video -lopencv_videostab
Finished building target: MySOM


00:21:45 Build Finished (took 210ms)

It looks find above but then...

Here is the Problems tab in eclipse:

Description Resource    Path    Location    Type

Invalid arguments '
Candidates are:
bool imwrite(const ? &, const cv::_InputArray &, const ? &)
'   SOM.cpp /MySOM/src  line 211    Semantic Error

Invalid arguments '
Candidates are:
cv::Mat imread(const ? &, int)
'   LoadFile.cpp    /MySOM/src  line 10 Semantic Error

Invalid arguments '
Candidates are:
void imshow(const ? &, const cv::_InputArray &)
'   main.cpp    /MySOM/src  line 22 Semantic Error

Invalid arguments '
Candidates are:
void namedWindow(const ? &, int)
'   main.cpp    /MySOM/src  line 21 Semantic Error

main.cpp

#include "Node.h"
#include <iostream>
#include "SOM.h"
#include <string>
#include "opencv2/core/core.hpp"
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>//FOR TESTING



void MyPause(std::string msg){
    if(msg != ""){
        std::cout << "[+] " << msg << std::endl;
    }
    std::cout << "Press enter to continue" << std::endl;
    std::cin.get();
}

void DisplayMat(cv::Mat img){
    static int number = 0;
    cv::namedWindow( "Input" + number, cv::WINDOW_AUTOSIZE );// ERROR HERE
    cv::imshow( "Input" + number, img );//ERROR HERE
    cv::waitKey(0);
    number++;
    return;
}


std::string filename = "/home/myUserName/Code/projectFiles/testMedia/myYellow.jpg";


int main(){

    //cv::Mat inputImg = LoadFile(filename);

    SOM som(filename);
    MyPause("After SOM initialization");
    DisplayMat(som.inputImg);

    MyPause("END OF MAIN");
    return 0;
}

I wonder if this could be occurring because of how I compiled opencv now compared to how i compiled it on my original system.

Upvotes: 2

Views: 998

Answers (3)

Wang
Wang

Reputation: 8163

This keeps happening to me when I upgrade the eclipse. It has all the strange error of Member declaration not found, invalid overload of endl, Invalid arguments ..., Now I figured out that it is the info in the workspace and old projects were not up-to-date for the new CDT codan. It is actually very easy to solve this problem: Project->C/C++ index->Rebuild. After it is done, all strange errors will go away.

Upvotes: 2

Some programmer dude
Some programmer dude

Reputation: 409136

This expression is not valid: "Input" + number. You can't just concatenate string literals with numbers. Well you can but the result will not be what you expect.

Fortunately you are programming C++, which means you can use std::string and std::to_string (if you have a C++11 compatible compiler): std::string("Input") + std::to_string(number).

If you don't have C++11, and therefore not std::to_string, then you can use e.g. the Boost lexical cast library, or std::istringstream to format the string, or other formatting functions/libraries.

Upvotes: 1

NDEthos
NDEthos

Reputation: 516

I had tried refreshing, cleaning, and rebuilding 3 times before doing this but it seems that after posting I tried a fourth just to be sure and behold it has worked.

Upvotes: 1

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