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unfortunately, it's not that easy, as c++ does not have multiple line strings, and you'd have to escape all "

a common way to handle this, is to make a "binary array" out of the xml string, and #include in your c++ prog.

think of it like this:

const char xml[] = {
60, 63, 120, 109, 108, 32, 118, 101, 114, 115, 105, 111, 110, 61, 34, 49,
....
};

so, you'll have to write a little program, to convert the xml file to a c++ header:

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main(int argc, char **argv) {
    string fn = "eye.xml";
    ifstream in(fn.c_str());
    string all,line;
    while (getline(in,line))
        all += line + "\n";

    ofstream out("eye.h");
    out << "const char xml[] = {";
    for (size_t i=0; i<all.length(); i++) {
        if (i%16==0) out << "\n";
        out << int(all[i]) << ", ";
    }
    out << "10};\n";
    return 0;
}

then, you can just use that in your prog:

#include "eye.h"
int main(int argc, const char * argv[])
{
    FileStorage fs(xml, FileStorage::READ | FileStorage::MEMORY);
    CascadeClassifier c;
    bool ok = c.read(fs.getFirstTopLevelNode()); // NOT root() !
    cerr << c.empty() << " " << ok << endl;
    return 0;
}