How to detect closing of namedWindow by mouse or ALT+F4
I have this simple code for showing an image from the command line:
int main(int argc, char* argv[]) {
int retStatus = -1;
if(argc < 2) {
std::cout << "Please provide a path to on image!" << std::endl;
} else {
std::string path = argv[1];
std::ifstream file(path);
if(!file) {
std::cout << "It seems that the file " << path <<
" Does not exist!" << std::endl;
} else { //file exist :)
cv::namedWindow(path); //autosize is default so no need to provide it
cv::Mat src = cv::imread(path); //read the file
if(!src.data) { //check for validity of the file
std::cout << "File is corrupted!" << std::endl;
} else {
cv::imshow(path, src);
while(cv::waitKey(1) != 27); //if ESC is not pressed
src.release();
retStatus = 0;
}
}
}
return retStatus;
}
It works, but only if I press the ESC key it terminates the program. If I hit the X on the window by mouse or press ALT+F4 the program does not terminate (but the window will be closed!). So how to detect this closing behavior?
"If I hit the X on the window by mouse or press ALT+F4 the program does not terminate "
this is unfortunately exactly the intended behaviour here.