The [COMMTIMEOUTS] structure is used in the SetCommTimeouts and GetCommTimeouts functions to set and query the time-out parameters for a communications device. The parameters determine the behavior of ReadFile, WriteFile, ReadFileEx, and WriteFileEx operations on the device.

The SetCommTimeouts API

The GetCommTimeouts API

The ReadFileScatter API

The ReadFileEx API

The WriteFileEx API

The ReadFileEx API