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Give a google.com search with the term 'CSerialPort', you will get at least 10 different classes with full source code and demo applications from codeproject, codeguru, etc.
You can simply use the mscomm32.ocx component.
Go to -> Project -> Add to Project -> Components and Controls -> select folder 'Registered ActiveX Controls' -> select 'Microsoft Communications Control, version 6.0' (or any other version); next it will add in your project a Class (with default name 'CMSCOMM') with all you need for RS232 communications.
Notice: I have experienced many problems using NULL characters, so try to ensure that you don't use it.
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