Writing binary data (CString) to file

[Carl Forsman]

I have some binary data encoded as Base64 encoding in an XML element
like this:

<data>TWFuIGlzI GRpc3Rpbmd1aXNo ZWQsIG5vdCBvbmx </data>

how can I extract this data -
TWFuIGlzIGRpc3R pbmd1aXNoZWQsIG 5vdCBvbmx

and save to a file say test2.xml

=============== ===
pug::xml_node_l ist CategoryEntries ;
PictureEntries[i].all_elements_b y_name("categor y", CategoryEntries );

// if found XML element
if (CategoryEntrie s.size() 0) {
for (unsigned int i = 0; i < CategoryEntries .size(); i++) {

//extract the Base64 string from XML element
//this Base64 string has binary data after decode
CString cat = CategoryEntries[i].child(0).value ();

//decode Base64 string into binary data
CString decoded = decodeBase64(ca t);

//open file to write the binary data
std::ofstream file1("c:/test2.xml");

// write the decoded binary data to file
file1.write(dec oded);

}
}