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IntPtr h = SetupDiGetClassDevs(ref DiskGUID, 0, IntPtr.Zero, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);

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Private Const DIGCF_PRESENT As Integer = &H2

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Private Const DIGCF_DEVICEINTERFACE As Integer = &H10

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Private Const DIGCF_ALLCLASSES As Integer = &H4

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DIGCF_PRESENT Or DIGCF_DEVICEINTERFACE)

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        IntPtr h = SetupDiGetClassDevs(0, DevEnum, IntPtr.Zero, DIGCF_PRESENT | DIGCF_ALLCLASSES);

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IntPtr h = SetupDiGetClassDevs(ref DiskGUID, 0, IntPtr.Zero, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);

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This signature has the drawback that it does not allow passing a null pointer as the first parameter, which is one of the common usages cited at [SetupDiGetClassDevs]: "To return devices for all device setup classes, set the DIGCF_ALLCLASSES flag, and set the ClassGuid parameter to NULL."

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            DIGCF_DEFAULT       = 0x00000001,  // only valid with DIGCF_DEVICEINTERFACE

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            DIGCF_PRESENT       = 0x00000002,

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            DIGCF_ALLCLASSES    = 0x00000004,

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            DIGCF_PROFILE       = 0x00000008,

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            DIGCF_DEVICEINTERFACE   = 0x00000010,

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const int DIGCF_DEFAULT = 0x1;

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const int DIGCF_PRESENT = 0x2;

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const int DIGCF_ALLCLASSES = 0x4;

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const int DIGCF_PROFILE = 0x8;

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const int DIGCF_DEVICEINTERFACE = 0x10;

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IntPtr h = SetupDiGetClassDevs(ref DiskGUID, IntPtr.Zero, IntPtr.Zero, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);

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        IntPtr h = SetupDiGetClassDevs(0, DevEnum, IntPtr.Zero, DIGCF_PRESENT | DIGCF_ALLCLASSES);

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IntPtr h = SetupDiGetClassDevs(ref DiskGUID, 0, IntPtr.Zero, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);

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    h = SetupDiGetClassDevs(myGuid, 0, IntPtr.Zero, DIGCF_PRESENT + DIGCF_DEVICEINTERFACE) '

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IntPtr h = SetupDiGetClassDevs(ref DiskGUID, 0, IntPtr.Zero, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);

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public enum DIGCF : int

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    DIGCF_DEFAULT = 0x00000001,    // only valid with DIGCF_DEVICEINTERFACE

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    DIGCF_PRESENT = 0x00000002,

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    DIGCF_ALLCLASSES = 0x00000004,

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    DIGCF_PROFILE = 0x00000008,

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    DIGCF_DEVICEINTERFACE = 0x00000010,

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Enum DIGCF

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Documentation

DIGCF @msdn on MSDN

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public enum DIGCF : int

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     DIGCF_DEFAULT = 0x00000001,    // only valid with DIGCF_DEVICEINTERFACE

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     DIGCF_PRESENT = 0x00000002,

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     DIGCF_ALLCLASSES = 0x00000004,

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     DIGCF_PROFILE = 0x00000008,

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     DIGCF_DEVICEINTERFACE = 0x00000010,

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Public Enum DIGCF 'only valid with DIGCF_DEVICEINTERFACE

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    DIGCF_DEFAULT = &H1

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    DIGCF_PRESENT = &H2

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    DIGCF_ALLCLASSES = &H4

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    DIGCF_PROFILE = &H8

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    DIGCF_DEVICEINTERFACE = &H10

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Documentation

[DIGCF] on MSDN