qt configuration file read and write operations

ini file read and write
xml file read and write
json file read and write
Save data structure to binary file and read
sqlite database file read

Qt binary file operation (read and write) detailed explanation (.stm and .dat files)
https://blog.csdn.net/weixin_38293453/article/details/104175328

<Qt5.9 C++ Development Guide> Chapter 7
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Origin blog.csdn.net/wowocpp/article/details/114931686