网上流传两个版本的DCB,经过验证有一个有问题

补充:

测试了一下使用左面的结构定义, 使用字符串(baud=1111 parity=E data=8 stop=1)构造DCB只能改变波特率,对校验方式无效

可以用构造后用xDCB.parity=E来解决

右面的结构上面的对校验位有效,但是操作errorchar之类的比较麻烦

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下面两个DCB结构网上流传很广

其实在XP + VB6环境下右边这个才是准确的

虽然左边这个可以用于设置某些串口参数,但是要进行一些更深入的设置就会出问题,不报错但是设置不起作用

fBitFields:

' The fourteen actual DCB bit-sized data fields within the four bytes of fBitFields can be manipulated by bitwise logical And/Or operations.

' FieldName Bit # Description

' ----------------- ----- ------------------------------

' fBinary 1 1 binary mode, no EOF check

' fParity 2 1 enable parity checking

' fOutxCtsFlow 3 0 CTS output flow control

' fOutxDsrFlow 4 0 DSR output flow control

' fDtrControl 5 0 DTR flow control type (2 bits)

' fDsrSensitivity 7 0 DSR sensitivity

' fTXContinueOnXoff 8 0 XOFF continues Tx

' fOutX 9 0 XON/XOFF out flow control

' fInX 10 0 XON/XOFF in flow control

' fErrorChar 11 1 enable error replacement

' fNull 12 1 enable null stripping

' fRtsControl 13 0 RTS flow control (2 bits)

' fAbortOnError 15 1 abort reads/writes on error

' fDummy2 16 0 reserved

Type DCB Type DCB

DCBlength As Long DCBlength As Long

BaudRate As Long BaudRate As Long

fBinary As Long fBitFields As Long

fParity As Long wReserved As Integer

fOutxCtsFlow As Long XonLim As Integer

fOutxDsrFlow As Long XoffLim As Integer

fDtrControl As Long ByteSize As Byte

fDsrSensitivity As Long Parity As Byte

fTXContinueOnXoff As Long StopBits As Byte

fOutX As Long XonChar As Byte

fInX As Long XoffChar As Byte

fErrorChar As Long ErrorChar As Byte

fNull As Long EofChar As Byte

fRtsControl As Long EvtChar As Byte

fAbortOnError As Long wReserved1 As Integer 'Reserved; Do Not Use

fDummy2 As Long End Type

wReserved As Integer

XonLim As Integer

XoffLim As Integer

ByteSize As Byte

Parity As Byte

StopBits As Byte

XonChar As Byte

XoffChar As Byte

ErrorChar As Byte

EofChar As Byte

EvtChar As Byte

End Type