星期二, 7月 26, 2005

[VFP]How to detect device arrival?

幫朋友找資料找到的,順道貼上來
我沒試過
不過我想應該是可以運行吧~~

以 VFP 或 VB 來說,是利用 sysinfo 這個 Active X control .
主要是攔截 DeviceArrival 這個 event

詳細的範例可以參考DeviceArrival Event Example

雖然他是 VB 的範例,不過看起來應該是很好改成 VFP 才是...

Private Sub SysInfo1_DeviceArrival(ByVal DeviceType As Long, ByVal DeviceID As Long, ByVal DeviceName As String, ByVal DeviceData As Long)
Debug.Print "DeviceArrival"
Debug.Print "devicetype " & DeviceType
Debug.Print "DeviceID " & GetDrive(DeviceType, DeviceID)
Debug.Print "DeviceName " & DeviceName
Debug.Print "DeviceData " & DeviceData
End Sub

Private Function GetDrive(devType As Long, devID As Long) As String
Select Case devType
Case 0 To 1 ' returns null
GetDrive = devID
Exit Function
Case 3 To 4 ' returns null
GetDrive = devID
Exit Function
Case 2 ' logical drive.
' Create an array for the possible drive numbers returned by
' deviceID
Dim drives(25) ' A-Z
Dim dvNum As Long ' Possible bit values.
Dim i As Integer
dvNum = 1
drives(0) = 1
' Populate with bit values.
For i = 1 To 25
dvNum = dvNum * 2
drives(i) = dvNum
Next i
For i = 0 To 25
If drives(i) = devID Then
GetDrive = "Drive: " & Chr(i + 65)
Exit Function
End If
Next I
Case Else ' Other unexpected returns
Debug.Print devType, devID
End Select
End Function

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