如何让VB.Net使用WriteByte（） [英] How do I get VB.Net to use WriteByte()

问题描述

你好，

周一早上再次混乱！在VB.Net（VS 2008）中是否支持WriteByte？ MSDN说是的，

Jan Axelson的Serial Port-to-book Serial Port Complete 2nd Ed说是，但是IDE报告WriteByte不是'System.IO.Ports.SerialPort'的成员。我可以这样做的一种方法是

将Ascii字符转换为等效小数，然后通过Com端口发送它们，如下所示

  Dim  ByteToSend  As  字节 
 
 ByteToSend（ 0 ）=  49  
 ByteToSend（ 1 ）=  48  
 ByteToSend（ 3 ）=  48  
 

并发送以下内容：

 myComPort.Write（ByteToSend， 0 ， 3 ）

然而，这会产生以下错误

表达式不是数组或方法，也不能有参数列表。

嗯？我想要做的是将100发送到串口上的设备，该设备似乎不会响应Write / WriteLine。 Aggah！

解决方案

不，它没有！

SerialPort类中没有WriteByte方法： http://msdn.microsoft.com/en-us/library/System .IO.Ports.SerialPort_methods（v = vs.110）.aspx [ ^ ]

有一个Write方法接受一个字节数组，但是没有发送单字节值的具体方法。



你需要做的是修改ByteToSend的声明：

  Dim  ByteToSend（ 3 ） As  字节 

所以它是一个数组，而不是一个字节。

也许我是遗失了什么，但看起来喜欢琐碎。

  Dim  ByteToSend  As    新   字节   （ 3 ）  
 ByteToSend（ 0 ）=  49  
 ByteToSend（ 1 ）=  48  
 ByteToSend（   2   ）=  48  
 myComPort.Write（ByteToSend， 0 ， 3 ）

或者这些只是打字错误而且我完全偏离了主题。

无论如何，希望这会有所帮助。

Hi There,
Monday morning confusion again! In VB.Net (VS 2008) is WriteByte supported? MSDN says Yes,
The Serial Port go-to book Serial Port Complete 2nd Ed by Jan Axelson says Yes, but the IDE reports WriteByte is not a member of 'System.IO.Ports.SerialPort'. One way I can do it is
to convert the Ascii chars to there equivalent decimal and send them via a Com port write like the following

Dim ByteToSend As Byte

       ByteToSend(0) = 49
       ByteToSend(1) = 48
       ByteToSend(3) = 48

and send this with a:

myComPort.Write(ByteToSend, 0, 3) 

This however generates the following error

Expression is not an array or a method, and cannot have an argument list.

Huh? What I am trying to do is send "100" to a device on a serial port that wont seem to respond to a Write/WriteLine. Aggah!

解决方案

No, it doesn't!
There is no WriteByte method in the SerialPort class: http://msdn.microsoft.com/en-us/library/System.IO.Ports.SerialPort_methods(v=vs.110).aspx[^]
There is a Write method that accepts an array of bytes, but there is no specific method to send a single byte value.

What you need to do is modify the declaration of ByteToSend:

Dim ByteToSend(3) As Byte

So it is an array, rather than a single byte.

Maybe I'm missing something, but it looks like trivial.

Dim ByteToSend As New Byte(3)
ByteToSend(0) = 49
ByteToSend(1) = 48
ByteToSend(2) = 48
myComPort.Write(ByteToSend, 0, 3)

Or these were just typos and I'm completely off-subject.
Anyway, hope this helps.

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