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私はこれにしばらく苦労しており、これを機能させるためにあらゆる種類のことを試みています。初めて SetupDiGetDeviceInterfaceDetail を呼び出す唯一の目的は RequiredSize を正しい値に設定することであるため、 SetupDiGetDeviceInterfaceDetail は初めて 1784 エラーを発生させるはずだと私は理解しています。2 回目に呼び出されると、実際に機能し、有効な DeviceInterfaceDetailData 構造が得られるはずです。2回目の呼び出しでこれが失敗する原因はわかりません。

構造定義:

<StructLayout(LayoutKind.Sequential)> _
Public Structure SP_DEVICE_INTERFACE_DETAIL_DATA
    Public cbSize As UInt32
    <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=256)> _
    Public DevicePath As String
End Structure

Public Structure SP_DEVICE_INTERFACE_DATA
    Public cbSize As Integer
    Public InterfaceClassGuid As System.Guid
    Public Flags As Integer
    Public Reserved As UIntPtr
End Structure

Public Structure SP_DEVINFO_DATA
    Public cbSize As Integer
    Public ClassGuid As System.Guid
    Public DevInst As Integer
    Public Reserved As UIntPtr
End Structure

関数宣言:

Public Declare Auto Function SetupDiGetClassDevs Lib "setupapi.dll" (ByRef ClassGuid As System.Guid, ByVal Enumerator As Integer, ByVal hwndParent As IntPtr, ByVal Flags As Integer) As IntPtr

Public Declare Auto Function SetupDiEnumDeviceInfo Lib "setupapi.dll" (ByVal DeviceInfoSet As Integer, ByVal MemberIndex As Integer, ByRef DeviceInfoData As SP_DEVINFO_DATA) As Boolean

Public Declare Auto Function SetupDiEnumDeviceInterfaces Lib "setupapi.dll" (ByVal DeviceInfoSet As IntPtr, ByRef DeviceInfoData As SP_DEVINFO_DATA, ByRef InterfaceClassGuid As System.Guid, ByVal MemberIndex As UInteger, ByRef DeviceInterfaceData As SP_DEVICE_INTERFACE_DATA) As Boolean

//For the first call
Public Declare Auto Function SetupDiGetDeviceInterfaceDetail Lib "setupapi.dll" (ByVal DeviceInfoSet As IntPtr, ByRef DeviceInterfaceData As SP_DEVICE_INTERFACE_DATA, ByVal DeviceInterfaceDetailData As IntPtr, ByVal DeviceInterfaceDetailDataSize As Integer, ByRef RequiredSize As Integer, ByRef DeviceInfoData As IntPtr) As Boolean

//For the second call
Public Declare Auto Function SetupDiGetDeviceInterfaceDetail Lib "setupapi.dll" (ByVal DeviceInfoSet As IntPtr, ByRef DeviceInterfaceData As SP_DEVICE_INTERFACE_DATA, ByRef DeviceInterfaceDetailData As SP_DEVICE_INTERFACE_DETAIL_DATA, ByVal DeviceInterfaceDetailDataSize As Integer, ByRef RequiredSize As Integer, ByRef DeviceInfoData As SP_DEVINFO_DATA) As Boolean

関数呼び出し:

    Dim DeviceInterfaceData As SP_DEVICE_INTERFACE_DATA
    Dim DeviceInterfaceDetailDataSize As Integer
    Dim DeviceInterfaceDetailData As SP_DEVICE_INTERFACE_DETAIL_DATA = Nothing
    Dim DeviceInfoSet As IntPtr
    Dim RequiredSize As Integer
    Dim HidGuid As System.Guid
    HidD_GetHidGuid(HidGuid)
    Dim LastError As Integer

    DeviceInterfaceData.cbSize = Marshal.SizeOf(DeviceInterfaceData)
    DeviceInterfaceDetailData.cbSize = Marshal.SizeOf(DeviceInterfaceDetailData
    DeviceInfoData.cbSize = Marshal.SizeOf(DeviceInfoData)


    DeviceInfoSet = SetupDiGetClassDevs(HidGuid, 0, IntPtr.Zero, DIGCF_PRESENT + DIGCF_DEVICEINTERFACE)

    success = SetupDiEnumDeviceInfo(DeviceInfoSet, 0, DeviceInfoData)
    LastError = GetLastError()

    success = SetupDiEnumDeviceInterfaces(DeviceInfoSet, DeviceInfoData, HidGuid, 0, DeviceInterfaceData)

    success = SetupDiGetDeviceInterfaceDetail(DeviceInfoSet, DeviceInterfaceData, IntPtr.Zero, 0, RequiredSize, IntPtr.Zero)
    //Success is false. GetLastError() shows 1784, but RequiredSize gets set to 166

    DeviceInterfaceDetailDataSize = RequiredSize + 16

    success = SetupDiGetDeviceInterfaceDetail(DeviceInfoSet, DeviceInterfaceData, DeviceInterfaceDetailData, DeviceInterfaceDetailDataSize, RequiredSize, DeviceInfoData)
    //Success is false. GetLastError() shows 1784, and DeviceInterfaceDetailData does not get set, so I can't get DeviceInterfaceDetailData.DevicePath
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2 に答える 2

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Private Structure SP_DEVICE_INTERFACE_DETAIL_DATA
    Dim cbSize As UInteger
    Dim DevicePath() As Char
End Structure

For target CPU x86: DetailedInterfaceDataStructure.cbSize = 6
For target CPU x64: DetailedInterfaceDataStructure.cbSize = 8
于 2012-08-25T20:42:12.067 に答える
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設定する必要があります

DeviceInterfaceDetailData.cbSize = Marshal.SizeOf(UInt32) + Marshal.SizeOf(Char)

SetupDiGetDeviceInterfaceDetail から返された最初の結果コードを無視します。

構造体 DeviceInterfaceDetailData は次のように宣言されます。

typedef struct _SP_DEVICE_INTERFACE_DETAIL_DATA {
  DWORD cbSize;
  TCHAR DevicePath[ANYSIZE_ARRAY];
} SP_DEVICE_INTERFACE_DETAIL_DATA, *PSP_DEVICE_INTERFACE_DETAIL_DATA;

ANYSIZE_ARRAY は 1 つです!

于 2012-07-24T22:27:51.820 に答える