本文介绍了在Qt5中使用QIODevice的write函数进行串口通信时，如何判断数据写入是否成功。通过测试不同场景（单片机断电和供电），作者发现使用int、bool和qint64类型检测write函数的返回值可能存在误导，因为在某些情况下，返回值可能并不准确地反映写入状态。
Qt串口mycom->write()函数写入失败的判断
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官方文档解释：
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qint64 QIODevice::write ( const char * data, qint64 maxSize )
Writes at most maxSize bytes of data from data to the device. Returns the number of bytes that were actually written, or -1 if an error occurred.
See also read() and writeData().
qint64 QIODevice::write ( const char * data )
This is an overloaded function.
Writes data from a zero-terminated string of 8-bit characters to the device. Returns the number of bytes that were actually written, or -1 if an error occurred. This is equivalent to
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