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.
typedef struct _COMMTIMEOUTS { // ctmo DWORD ReadIntervalTimeout; DWORD ReadTotalTimeoutMultiplier; DWORD ReadTotalTimeoutConstant; DWORD WriteTotalTimeoutMultiplier; DWORD WriteTotalTimeoutConstant; } COMMTIMEOUTS,*LPCOMMTIMEOUTS;
A value of MAXDWORD, combined with zero values for both the ReadTotalTimeoutConstant
and ReadTotalTimeoutMultiplier members, specifies that the read
operation is to return immediately with the characters that have already been
received, even if no characters have been received.
A value of zero for both the ReadTotalTimeoutMultiplier and ReadTotalTimeoutConstant
members indicates that total time-outs are not used for read operations.
A value of zero for both the WriteTotalTimeoutMultiplier and WriteTotalTimeoutConstant members indicates that total time-outs are not used for write operations.
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:
GetCommTimeouts, ReadFile, ReadFileEx, SetCommTimeouts, WriteFile, WriteFileEx
file: /Techref/os/win/api/win32/struc/src/str02_2.htm, 4KB, , updated: 2000/4/7 11:20, local time: 2024/12/23 00:24,
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