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even if you're using some outdated opencv2.4 version, try to avoid c-based datastructures, like CvMat , IplImage, CvMlData , and such.

then, while CvMlData can be used for numerical data, it won't work with strings at all.

try with vector<string> , and something manual:

vector<string> names;
vector<int> ids;
int id;
char sep;
string name;

ifstream csv("asd.csv")
while(csv.good() && (csv >> id >> sep >> name)) {
    ids.push_back(id);
    names.push_back(name);
}

even if you're using some outdated opencv2.4 version, try to avoid c-based datastructures, like CvMat , IplImage, CvMlData , and such.

then, while CvMlData can be used for numerical data, it won't work with strings at all.

try with vector<string> , and something manual:

vector<string> names;
vector<int> ids;
int id;
char sep;
string name;

ifstream csv("asd.csv")
csv("asd.csv");
getline(csv, name); // skip header line
while(csv.good() && (csv >> id >> sep >> name)) {
    ids.push_back(id);
    names.push_back(name);
}