SP_DEVINFO_DATA da = new SP_DEVINFO_DATA();

           CM_Request_Device_Eject_NoUi((int)USBData.DevInst, IntPtr.Zero, null, 0, 0); // USBData, a SP_DEVINFO_DATA structure.

     ref SP_DEVINFO_DATA DeviceInfoData

                          ByRef DeviceInfoData As SP_DEVINFO_DATA _

                          ByRef DeviceInfoData As SP_DEVINFO_DATA _

SP_DEVINFO_DATA

    private bool ChangeIt(IntPtr hDevInfo, Native.SP_DEVINFO_DATA devInfoData, bool bEnable)

static extern bool SetupDiEnumDeviceInfo(IntPtr DeviceInfoSet, uint MemberIndex, ref SP_DEVINFO_DATA DeviceInfoData);

    ByRef DeviceInfoData As SP_DEVINFO_DATA) As Boolean

    ByRef DeviceInfoData As SP_DEVINFO_DATA) As Boolean

SP_DEVINFO_DATA

out Pointer to an SP_DEVINFO_DATA structure that receives information about this element. You must set the cbSize member to sizeof(SP_DEVINFO_DATA) before calling this function.

            SP_DEVINFO_DATA da = new SP_DEVINFO_DATA();

   ref SP_DEVINFO_DATA devInfo,

if you do not care about SP_DEVINFO_DATA and wish to pass NULL (IntPtr.Zero). Note example below uses this signature.

SP_DEVINFO_DATA

SP_DEVINFO_DATA

SP_DEVINFO_DATA

       SP_DEVINFO_DATA da = new SP_DEVINFO_DATA();

       SP_DEVINFO_DATA da = new SP_DEVINFO_DATA();

    static extern bool SetupDiGetDeviceInstallParams(IntPtr hDevInfo, ref SP_DEVINFO_DATA DeviceInfoData, ref SP_DEVINSTALL_PARAMS DeviceInstallParams);

                              ByRef DeviceInfoData As SP_DEVINFO_DATA, _

    Public Structure SP_DEVINFO_DATA

   ref SP_DEVINFO_DATA DeviceInfoData,

SP_DEVINFO_DATA

   IN PSP_DEVINFO_DATA  DeviceInfoData,

            SP_DEVINFO_DATA da = new SP_DEVINFO_DATA();

   ref SP_DEVINFO_DATA deviceInfoData

    ByRef deviceInfoData As SP_DEVINFO_DATA) As Boolean

    ByRef DeviceInfoData As SP_DEVINFO_DATA) As Boolean '

SP_DEVINFO_DATA

SP_DEVINFO_DATA

SP_DEVINFO_DATA

       SP_DEVINFO_DATA da = new SP_DEVINFO_DATA();

       Dim da, da2 As SP_DEVINFO_DATA

        ref SP_DEVINFO_DATA DeviceInfoData,

        ref SP_DEVINFO_DATA DeviceInfoData,

    ref SP_DEVINFO_DATA deviceInfoData,

    ref SP_DEVINFO_DATA deviceInfoData,

deviceInfoData, Pointer to an SP_DEVINFO_DATA structure that defines the device instance.

    ByRef DeviceInfoData As SP_DEVINFO_DATA, _

SP_DEVINFO_DATA

       SP_DEVINFO_DATA da = new SP_DEVINFO_DATA();

    ref SP_DEVINFO_DATA deviceInfoData,

Private Function SetupDiOpenDevRegKey(DeviceInfoSet As IntPtr, ByRef DeviceInfoData As SP_DEVINFO_DATA, Scope As UInteger, HwProfile As UInteger, KeyType As UInteger, samDesired As UInteger) As IntPtr

static extern bool SetupDiSetClassInstallParams(IntPtr DeviceInfoSet, ref SP_DEVINFO_DATA DeviceInfoData, IntPtr ClassInstallParams, int ClassInstallParamsSize);

public struct SP_DEVINFO_DATA

    private bool ChangeIt(IntPtr hDevInfo, Native.SP_DEVINFO_DATA devInfoData, bool bEnable)

static extern bool SetupDiSetClassInstallParams(IntPtr DeviceInfoSet, ref SP_DEVINFO_DATA DeviceInfoData, IntPtr ClassInstallParams, int ClassInstallParamsSize);

public struct SP_DEVINFO_DATA

struct SP_DEVINFO_DATA

Private Structure SP_DEVINFO_DATA

On 32bit platforms, all SetupApi structures are 1-Byte packed. On 64bit platforms the SetupApi structures are 8-byte packed. IE for 32 bit SP_DEVINFO_DATA.cbSize=28, for 64Bit SP_DEVINFO_DATA.cbSize=(28+4)=32.