调用SetupDiEnumDeviceInterfaces枚举USB设备失败
我最近在做一个操作USB设备的程序,但在打开设备时遇到了问题.步骤如下,

1.调用SetupDiGetClassDevs.这一部正常获得句柄

2.调用SetupDiEnumDeviceInterfaces,枚举设备.在调用时无论如何返回值也是false.

3.两次调用SetupDiGetDeviceInterfaceDetail,获取设备详细信息,设备名.

4.调用CreateFile,打开设备句柄.

这里3和4因为步骤2不能正确获取信息,而不能进行.

因为这段代码在VC下运行正常,所以我怀疑是我在vb.net下的调用不对.

代码如下

//函数原型

WINSETUPAPI

BOOL

WINAPI

SetupDiEnumDeviceInterfaces(

__in HDEVINFO DeviceInfoSet,

__in_opt PSP_DEVINFO_DATA DeviceInfoData,

__in CONST GUID *InterfaceClassGuid,

__in DWORD MemberIndex,

__out PSP_DEVICE_INTERFACE_DATA DeviceInterfaceData

);



'''vb.net中的调用

<DllImport("setupapi.dll", CharSet:=CharSet.Auto, SetLastError:=True)> _

Public Shared Function SetupDiEnumDeviceInterfaces(ByVal hDevInfo As IntPtr, _

ByVal devInfo As IntPtr, ByRef interfaceClassGuid As Guid, ByVal memberIndex As UInt32, _

ByRef deviceInterfaceData As SP_DEVICE_INTERFACE_DATA) As Boolean

End Function



'''SP_DEVICE_INTERFACE_DATA 结构体

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Auto)> Public Class SP_DEVICE_INTERFACE_DATA

Public cbSize As Integer

Public classGuid As Guid

Public devInst As Integer

Public reserved As Integer

End Class


希望有经验的朋友可以帮忙看一下,问题出在哪里


[解决办法]
C#
http://www.codeproject.com/KB/system/usbeject.aspx




http://social.msdn.microsoft.com/Forums/en/vbgeneral/thread/b772573e-c78d-4032-85eb-7e734ccebaff

http://hidlibrary.codeplex.com/