How to wait forever for at least one byte using COMMTIMEOUTS?

Question

How can I configure COMMTIMEOUTS to wait forever for at least one byte to be read?

Answer 1

From the Remarks sections of the COMMTIMEOUTS link you posted:

If an application sets ReadIntervalTimeout and ReadTotalTimeoutMultiplier to MAXDWORD and sets ReadTotalTimeoutConstant to a value greater than zero and less than MAXDWORD, one of the following occurs when the ReadFile function is called:

• If there are any bytes in the input buffer, ReadFile returns immediately with the bytes in the buffer.
• If there are no bytes in the input buffer, ReadFile waits until a byte arrives and then returns immediately.
• If no bytes arrive within the time specified by ReadTotalTimeoutConstant, ReadFile times out.