vbnet串口助手源码 vb串口程序源码

vb.net 串口接收问题

0x3F表示字符"?"

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估计是你的发送指令不正确,设备返回你发送的指令后面加''?""

怎样在vb中自动检测到可用串口号的具体程序代码

vb.net的话

For

Each

sp

As

String

In

My.Computer.Ports.SerialPortNames

cbxport.Items.Add(sp)

Next

vb6.0的话要调用API查看串口相关信息存在的注册表。

HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM

通过读注册表的方法获得串口数量,当然也可以获得串口号了。

Option

Explicit

Private

Declare

Function

RegOpenKey

Lib

"advapi32.dll

"

Alias

"RegOpenKeyA

"

(ByVal

hKey

As

Long,

ByVal

lpSubKey

As

String,

phkResult

As

Long)

As

Long

Private

Declare

Function

RegQueryInfoKey

Lib

"advapi32.dll

"

Alias

"RegQueryInfoKeyA

"

(ByVal

hKey

As

Long,

ByVal

lpClass

As

String,

lpcbClass

As

Long,

ByVal

lpReserved

As

Long,

lpcSubKeys

As

Long,

lpcbMaxSubKeyLen

As

Long,

lpcbMaxClassLen

As

Long,

lpcValues

As

Long,

lpcbMaxValueNameLen

As

Long,

lpcbMaxValueLen

As

Long,

lpcbSecurityDescriptor

As

Long,

lpftLastWriteTime

As

Long)

As

Long

Private

Const

HKEY_LOCAL_MACHINE

=

H80000002

'

获得当前系统的

COM

口的数量

Function

GetCOMCount()

As

Integer

Dim

ret

As

Long,

cntCOM

As

Long

RegOpenKey

HKEY_LOCAL_MACHINE,

"HARDWARE\DEVICEMAP\SERIALCOMM

",

ret

RegQueryInfoKey

ret,

"

",

0,

0,

0,

0,

0,

cntCOM,

0,

0,

0,

GetCOMCount

=

cntCOM

End

Function

Private

Sub

Command1_Click()

MsgBox

"您的机器有

"

GetCOMCount

"

个串口。

",

vbOKOnly,

"串口数量

"

End

Sub

VB.NET使用AxMSComm实现串口通信的发送读取问题?

上面的代码看不出问题,如果初始化串口控件时已经注册了AxMSComm1_OnComm,有数据接收应该能触发,至于为什么没有触发,要看看你的接收方是否已经收到你的发出指令,是否已经有响应数据回发。

建议分开调试,用一个通用的串口助手,如格西烽火串口助手之类的,分别调试你的上位机和下位机。格西烽火串口助手能轻松的定制如你上面的发送数据。

VB。net 串口接收数据,用串口调试助手发数据,只有第一次可以正常接收

你定义的委托需要带参数才行,DataReceived事件中没有接收数据代码,下面的代码经测试可用

Delegate Sub SetTextCallback(ByVal InputString As String)

Private Sub ShowString(ByVal comData As String)

txt_Rect.Text += comData '将收到的数据入接收文字框中

txt_Rect.SelectionStart = txt_Rect.Text.Length

txt_Rect.ScrollToCaret()

End Sub

Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived

Dim inData As String = SerialPort1.ReadExisting

Dim d As New SetTextCallback(AddressOf ShowString)

BeginInvoke(d, inData)

End Sub


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