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vs2017, using the registry COM port enumeration. Compile with x86, serial name appears normal, abnormal compiled by the name of the serial port x64.
Program reference: https://www.cnblogs.com/irving314/archive/2011/06/25/serialportenumerate4.html query the registry law
Marked breakpoint found in the 64-bit compiler, shaped like a "COM20" is stored as "C \ 0O \ 0M \ 02 \ 00 \ 0".