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if you are using ClassifierCascade, you could save the xml as a string in some header file, and read it using FileStorage.

string xml_in_memory = "<xml> ..... </xml>";

CascadeClassifier casc;
FileStorage fs( xml_in_memory, FileStorage::READ|FileStorage::MEMORY);
FileNode fn = fs.getFirstTopLevelNode();
casc.read(fn);

unfortunately, this will only work with cascades in the new format, generated by opencv_traincascade, not with the old ones generated by opencv_haartraining.

if you are using ClassifierCascade, you could save the xml as a string in some header file, and read it using FileStorage.

string xml_in_memory = "<xml> "<?xml> ..... </xml>";

CascadeClassifier casc;
FileStorage fs( xml_in_memory, FileStorage::READ|FileStorage::MEMORY);
FileNode fn = fs.getFirstTopLevelNode();
casc.read(fn);

unfortunately, this will only work with cascades in the new format, generated by opencv_traincascade, not with the old ones generated by opencv_haartraining.

    string xml_in_memory = 
"<?xml version=\"1.0\"?>\r\n"    <-- escape the " (replace it by \")
"<!--\r\n"                       
"    This is 20x34 detector of profile faces using LBP features.\r\n"
"    It was created by Attila Novak during GSoC 2012.\r\n"
...

\r\n  -> \\r\\n"\r\n"

if you are using ClassifierCascade, you could save the xml as a string in some header file, and read it using FileStorage.

string xml_in_memory = "<?xml> ..... </xml>";

CascadeClassifier casc;
FileStorage fs( xml_in_memory, FileStorage::READ|FileStorage::MEMORY);
FileNode fn = fs.getFirstTopLevelNode();
casc.read(fn);

unfortunately, this will only work with cascades in the new format, generated by opencv_traincascade, not with the old ones generated by opencv_haartraining.

    string xml_in_memory = 
"<?xml version=\"1.0\"?>\r\n"    <-- escape the " (replace it by \")
"<!--\r\n"                       
"    This is 20x34 detector of profile faces using LBP features.\r\n"
"    It was created by Attila Novak during GSoC 2012.\r\n"
...

\r\n  -> \\r\\n"\r\n"

if you are using ClassifierCascade, you could save the xml as a string in some header file, and read it from memory using FileStorage.

string xml_in_memory = "<?xml> ..... </xml>";

CascadeClassifier casc;
cascade;
FileStorage fs( xml_in_memory, FileStorage::READ|FileStorage::MEMORY);
FileNode fn = fs.getFirstTopLevelNode();
casc.read(fn);
bool ok = cascade.read(fn);

unfortunately, this will only work with cascades in the new format, generated by opencv_traincascade, not with the old ones generated by opencv_haartraining.

[edit] getting the xml-string right included some tricks.

    string xml_in_memory = 
"<?xml version=\"1.0\"?>\r\n"    <-- escape the " (replace it by \")
"<!--\r\n"                       
"    This is 20x34 detector of profile faces using LBP features.\r\n"
"    It was created by Attila Novak during GSoC 2012.\r\n"
...

each line has to go into a single string, and you need to retain the linefeeds, so you will need a texteditor, that can handle backslash expressions like this:

\r\n  -> \\r\\n"\r\n"