Reading nested XML in OpenCV

Question

This stackoverflow question answers how to write data into an XML file with nesting: Creating an XML file in OpenCV

With Reference to the same question (and the accepted answer), how would I read the same file using the FileStorage class?

In short, how do I read the data the following code snippet writes?

FileStorage fs;  // Open it and check that it is opened;

fs << "SimpleData"  << 1;

fs << "Structure" << "{";
fs << "firstField"  << 1;
fs << "secondField"  << 2;
fs << "}"; // End of structure node

fs << "SimpleData2"  << 2;

Answer 1

You can use:

FileStorage fs;
fs.open(filename, FileStorage::READ);

int SimpleData = (int) fs["SimpleData"];

FileNode n = fs["Structure"];  // Read Structure sequence - Get node
int firstField = (int)(n["firstField"]);
int secondField = (int)(n["secondField"]);

int SimpleData2 = (int) fs["SimpleData2"];

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