VB2010开发USB接口时遇枚举设备问题
Public Declare Function HidD_GetHidGuid Lib "hid.dll" (ByRef HidGuid As GUID) As Long

Public Structure GUID
Dim data1 As Long
Dim data2 As Integer
Dim data3 As Integer
Dim data4() As Byte
End Structure

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim HidGuid As GUID
Dim DeviceInfoSet As Long
Dim vbNullString As String = Nothing

Result = HidD_GetHidGuid(HidGuid) 这里HidGuid出现NULL引用异常
End Sub

估计GUID这个结构体初始化不正确，望有经验的高手指点一二……
[解决办法]
看看这本书，也许对你有帮助：
http://download.csdn.net/source/1673828
[解决办法]

引用:

看看这本书，也许对你有帮助：
http://download.csdn.net/source/1673828

我这账号暂时下载不了呀，能不能发份到我邮箱呀？谢谢啦！！！530586620@QQ.com