为什么我不能使用Qt中的QXmlStreamReader解析XML文件?

I'm trying to figure out how QXmlStreamReader works for a C++ application I'm writing. The XML file I want to parse is a large dictionary with a convoluted structure and plenty of Unicode characters so I decided to try a small test case with a simpler document. Unfortunately, I hit a wall. Here's the example xml file:I'm trying to figure out how QXmlStreamReader w