使用CSV文件去读图像和标签

//使用CSV文件去读图像和标签，主要使用stringstream和getline方法
staticvoid read_csv(const string& filename, vector& images, vector& labels, char separator =';') {
	std::ifstream file(filename.c_str(), ifstream::in);
	if (!file) {
		string error_message ="No valid input file was given, please check the given filename.";
		CV_Error(CV_StsBadArg, error_message);
	}
	string line, path, classlabel;
	while (getline(file, line)) {
		stringstream liness(line);
		getline(liness, path, separator);
		getline(liness, classlabel);
		if(!path.empty()&&!classlabel.empty()) {
			images.push_back(imread(path, 0));
			labels.push_back(atoi(classlabel.c_str()));
		}
	}
}