vb.net 讀取掃描槍USB接口數(shù)據(jù)的實例

USB比較難抓數(shù)據(jù)，建議是USB模擬串口，或者直接就是串口，這樣數(shù)據(jù)比較好抓。

沙依巴克ssl適用于網(wǎng)站、小程序/APP、API接口等需要進行數(shù)據(jù)傳輸應用場景，ssl證書未來市場廣闊！成為創(chuàng)新互聯(lián)的ssl證書銷售渠道，可以享受市場價格4-6折優(yōu)惠！如果有意向歡迎電話聯(lián)系或者加微信：13518219792（備注：SSL證書合作）期待與您的合作！

USB上傳模式是鼠標光標在哪數(shù)據(jù)就上傳在哪，所以你抓USB的數(shù)據(jù)的很難！

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VB.NET怎樣把USB攝像頭在顯示器上輸出的實時畫面（像素信息），引入到數(shù)據(jù)庫.

用directshow獲取幀緩存,轉換為標準圖像格式(比如jpg,png這些),存儲到數(shù)據(jù)庫的image字段里就行了.

VB.NET檢測插入U盤時執(zhí)行某段代碼，并能獲取U盤盤符

以下內容為網(wǎng)絡提供,但我自己驗證可行,供你參考.

Imports System.IO

Public Class Form1

Public Const WM_DEVICECHANGE = H219

Public Const DBT_DEVICEARRIVAL = H8000

Public Const DBT_CONFIGCHANGECANCELED = H19

Public Const DBT_CONFIGCHANGED = H18

Public Const DBT_CUSTOMEVENT = H8006

Public Const DBT_DEVICEQUERYREMOVE = H8001

Public Const DBT_DEVICEQUERYREMOVEFAILED = H8002

Public Const DBT_DEVICEREMOVECOMPLETE = H8004

Public Const DBT_DEVICEREMOVEPENDING = H8003

Public Const DBT_DEVICETYPESPECIFIC = H8005

Public Const DBT_DEVNODES_CHANGED = H7

Public Const DBT_QUERYCHANGECONFIG = H17

Public Const DBT_USERDEFINED = HFFFF

Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)

If m.Msg = WM_DEVICECHANGE Then

Select Case m.WParam

Case WM_DEVICECHANGE

Case DBT_DEVICEARRIVAL 'U盤插入

ComboBox1.Items.Clear()

Dim s() As DriveInfo = DriveInfo.GetDrives

For Each drive As DriveInfo In s

If drive.DriveType = DriveType.Removable Then

ListBox1.Items.Add("U盤已插入！盤符為:" + drive.Name.ToString())

ComboBox1.Items.Add(drive.Name)

End If

Next

BtnWrite.Enabled = True

BtnRead.Enabled = True

Case DBT_CONFIGCHANGECANCELED

Case DBT_CONFIGCHANGED

Case DBT_CUSTOMEVENT

Case DBT_DEVICEQUERYREMOVE

Case DBT_DEVICEQUERYREMOVEFAILED

Case DBT_DEVICEREMOVECOMPLETE 'U盤卸載

ListBox1.Items.Add("U盤卸載！")

BtnWrite.Enabled = False

BtnRead.Enabled = False

Case DBT_DEVICEREMOVEPENDING

Case DBT_DEVICETYPESPECIFIC

Case DBT_DEVNODES_CHANGED

Case DBT_QUERYCHANGECONFIG

Case DBT_USERDEFINED

End Select

End If

MyBase.WndProc(m)

End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

ListBox1.Items.Add("請您現(xiàn)在插入U盤至USB接口！")

End Sub

Private Sub BtnWrite_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnWrite.Click

If ComboBox1.Text = "" Then

MsgBox("請選擇U盤盤符！", MsgBoxStyle.Exclamation, "Warn")

Else

Dim Writer As StreamWriter = Nothing

Try

Dim fileName As String = ComboBox1.Text + "Test.txt"

Writer = New StreamWriter(fileName)

Writer.WriteLine(InputBox("老四，請輸入要保存的字符串", "輸入信息", "Input then Test String! hehe!"))

MsgBox("Write to " + fileName + " Success!")

Catch ex As Exception

MsgBox(ex.Message, MsgBoxStyle.Critical, "Write 失敗")

Finally

If Writer IsNot Nothing Then Writer.Close()

End Try

End If

End Sub

Private Sub BtnRead_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnRead.Click

If ComboBox1.Text = "" Then

MsgBox("請選擇U盤盤符！", MsgBoxStyle.Exclamation, "Warn")

Else

Dim Reader As StreamReader = Nothing

Try

Dim fileName As String = ComboBox1.Text + "Test.txt"

Reader = New StreamReader(fileName)

MsgBox("Read from " + fileName + vbCrLf + Reader.ReadToEnd, MsgBoxStyle.Information, "Info")

Catch ex As Exception

MsgBox(ex.Message, MsgBoxStyle.Critical, "Read 失敗")

Finally

If Reader IsNot Nothing Then Reader.Close()

End Try

End If

End Sub

End Class

怎樣用VB讀來自USB口的數(shù)據(jù)

VB可用MsComm控件讀取來自USB轉RS232接口的數(shù)據(jù)。或者使用Winsock 控件接收來自USB網(wǎng)卡的數(shù)據(jù)。

MSComm 控件通過串行端口傳輸和接收數(shù)據(jù)，為應用程序提供串行通訊功能。

利用 WinSock 控件可以與遠程計算機建立連接，并通過用戶數(shù)據(jù)文報協(xié)議 (UDP)或者傳輸控制協(xié)議

(TCP)進行數(shù)據(jù)交換。這兩種協(xié)議都可以用來創(chuàng)建客戶與服務器應用程序。

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