C# Signature:

[DllImport("twain_32.dll", EntryPoint="#1")]

static extern TwRC DSMparent( [In, Out] TwIdentity origin, IntPtr zeroptr, TwDG dg, TwDAT dat, TwMSG msg, ref IntPtr refptr );

VB Signature:

Declare Function DSMparent Lib "twain_32.dll" (TODO) As TODO

User-Defined Types:

enum TwRC : short

{

    Success                = 0x0000,
    Failure                = 0x0001,
    CheckStatus            = 0x0002,
    Cancel                = 0x0003,
    DSEvent                = 0x0004,
    NotDSEvent            = 0x0005,
    XferDone            = 0x0006,
    EndOfList            = 0x0007,
    InfoNotSupported    = 0x0008,
    DataNotAvailable    = 0x0009

}

[StructLayout(LayoutKind.Sequential, Pack=2, CharSet=CharSet.Ansi)]

class TwIdentity

{

    public IntPtr        Id;
    public TwVersion    Version;
    public short        ProtocolMajor;
    public short        ProtocolMinor;
    public int            SupportedGroups;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=34)]
    public string        Manufacturer;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=34)]
    public string        ProductFamily;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=34)]
    public string        ProductName;

}

Flags

enum TwDG : short

    {
    Control            = 0x0001,
    Image            = 0x0002,
    Audio            = 0x0004
    }

enum TwDAT : short

    {
    Null            = 0x0000,
    Capability        = 0x0001,
    Event            = 0x0002,
    Identity        = 0x0003,
    Parent            = 0x0004,
    PendingXfers    = 0x0005,
    SetupMemXfer    = 0x0006,
    SetupFileXfer    = 0x0007,
    Status            = 0x0008,
    UserInterface    = 0x0009,
    XferGroup        = 0x000a,
    TwunkIdentity    = 0x000b,
    CustomDSData    = 0x000c,
    DeviceEvent        = 0x000d,
    FileSystem        = 0x000e,
    PassThru        = 0x000f,

    ImageInfo        = 0x0101,
    ImageLayout        = 0x0102,
    ImageMemXfer    = 0x0103,
    ImageNativeXfer    = 0x0104,
    ImageFileXfer    = 0x0105,
    CieColor        = 0x0106,
    GrayResponse    = 0x0107,
    RGBResponse        = 0x0108,
    JpegCompression    = 0x0109,
    Palette8        = 0x010a,
    ExtImageInfo    = 0x010b,

    SetupFileXfer2    = 0x0301

}

enum TwMSG : short

    {                                    // MSG_.....
    Null            = 0x0000,
    Get                = 0x0001,
    GetCurrent        = 0x0002,
    GetDefault        = 0x0003,
    GetFirst        = 0x0004,
    GetNext            = 0x0005,
    Set                = 0x0006,
    Reset            = 0x0007,
    QuerySupport    = 0x0008,

    XFerReady        = 0x0101,
    CloseDSReq        = 0x0102,
    CloseDSOK        = 0x0103,
    DeviceEvent        = 0x0104,

    CheckStatus        = 0x0201,

    OpenDSM            = 0x0301,
    CloseDSM        = 0x0302,

    OpenDS            = 0x0401,
    CloseDS            = 0x0402,
    UserSelect        = 0x0403,

    DisableDS        = 0x0501,
    EnableDS        = 0x0502,
    EnableDSUIOnly    = 0x0503,

    ProcessEvent    = 0x0601,

    EndXfer            = 0x0701,
    StopFeeder        = 0x0702,

    ChangeDirectory    = 0x0801,
    CreateDirectory    = 0x0802,
    Delete            = 0x0803,
    FormatMedia        = 0x0804,
    GetClose        = 0x0805,
    GetFirstFile    = 0x0806,
    GetInfo            = 0x0807,
    GetNextFile        = 0x0808,
    Rename            = 0x0809,
    Copy            = 0x080A,
    AutoCaptureDir    = 0x080B,

    PassThru        = 0x0901

}

Notes:

None.

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Sample Code:

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