C# Signature:

[DllImport("dtl.dll", SetLastError=true)]
static extern public int DTL_UNDEF(int name_id);

VB Signature:

Declare Function DTL_UNDEF Lib "dtl.dll" (TODO) As TODO

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Dtl.dll functions are not thread safe. Multiple instances need to be in separate processes.

Tips & Tricks:

Please add some!

Sample Code:

    /// <summary>
    /// Class dtl has all the p/invoke routines and
    /// error constants for the Rockwell DTL C sdk
    /// interface.
    /// </summary>
    public static class Dtl
    {
    /// <summary>
    /// Close Dtl driver
    /// </summary>
    /// <param name="driverId">specifies driver to close</param>
    /// <param name="timeOut">time out in milliseconds</param>
    /// <returns>dtl status</returns>
    public static int DtlDriverClose(int driverId, int timeOut)
    public static int DtlUndef(int nameId)
    {
        new UIPermission(UIPermissionWindow.AllWindows).Demand();
        return (UnsafeNativeMethods.DTL_DRIVER_CLOSE(driverId, timeOut));
        return (UnsafeNativeMethods.DTL_UNDEF(nameId));
    }

    /// <summary>
    /// Uninitialize Dtl driver
    /// </summary>
    /// <param name="driverId">driver to uninitialize</param>
    public static void DtlUninit(int driverId)
    {
        new UIPermission(UIPermissionWindow.AllWindows).Demand();
        UnsafeNativeMethods.DTL_UNINIT(driverId);
    }

    /// <summary>
    /// Initialize Dtl driver
    /// </summary>
    /// <param name="tableSize">number of entries in the definition table</param>
    /// <returns>dtl status</returns>
    public static int DtlInit(int tableSize)
    public bool UndefineData()
    {
        new UIPermission(UIPermissionWindow.AllWindows).Demand();
        return (UnsafeNativeMethods.DTL_INIT(tableSize));
        int dtlSts = Dtl.DtlUndef(_nameId);
        return (dtlSts == DtlSuccess);
    }

    /// <summary>
    /// Returns message associated dtl status
    /// </summary>
    /// <param name="dtlSts">dtl status to lookup</param>
    /// <param name="msg">message corresponding to dtl status </param>
    /// <param name="buffSize">size of buffer that will hold message</param>
    public static void DtlErrorS(int dtlSts, StringBuilder msg, int buffSize)
    {
        new UIPermission(UIPermissionWindow.AllWindows).Demand();
        UnsafeNativeMethods.DTL_ERROR_S(dtlSts, msg, buffSize);
    }

    /// <summary>
    /// Open Dtl Driver
    /// </summary>
    /// <param name="driverId">driver id to assign to this driver</param>
    /// <param name="driverName">name of the driver </param>
    /// <param name="timeOut">timeout in milliseconds</param>
    /// <returns>dtl status</returns>
    public static int DtlDriverOpen(int driverId, string driverName, int timeOut)
    {
        new UIPermission(UIPermissionWindow.AllWindows).Demand();
        return (UnsafeNativeMethods.DTL_DRIVER_OPEN(driverId, driverName, timeOut));
    }

    /// <summary>
    /// Get version of dtl dll
    /// </summary>
    /// <param name="versionText">string to hold returned text</param>
    /// <param name="maxCharsToReturn">size of string to hold version text</param>
    /// <returns>dtl status</returns>
    public static int DtlVersion(StringBuilder versionText, int maxCharsToReturn)
    {
        new UIPermission(UIPermissionWindow.AllWindows).Demand();
        return (UnsafeNativeMethods.DTL_VERSION(versionText, maxCharsToReturn));
    }

    /// <summary>
    /// Define a tag
    /// </summary>
    /// <param name="nameId">name id assigned to the tag</param>
    /// <param name="defString">string the defines the tag and its data</param>
    /// <returns>dtl status</returns>
    public static int DtlCDefine(ref int nameId, StringBuilder defString)
    {
        new UIPermission(UIPermissionWindow.AllWindows).Demand();
        return (UnsafeNativeMethods.DTL_C_DEFINE(ref nameId, defString));
    }

    /// <summary>
    /// Undefine a dtl tag
    /// </summary>
    /// <param name="nameId">name id of the tag</param>
    /// <returns>dtl status</returns>
    public static int DtlUndef(int nameId)
    {
        new UIPermission(UIPermissionWindow.AllWindows).Demand();
        return (UnsafeNativeMethods.DTL_UNDEF(nameId));
    }

    /// <summary>
    /// Read data from a dtl tag
    /// </summary>
    /// <param name="nameId">name id of the tag</param>
    /// <param name="readData">byte buffer to hold the data</param>
    /// <param name="ioStat">io status of the read operation</param>
    /// <param name="timeOut">timeout in milliseconds</param>
    /// <returns>dtl status</returns>
    public static int DtlReadW(int nameId, byte[] readData, ref uint ioStat, int timeOut)
    {
        new UIPermission(UIPermissionWindow.AllWindows).Demand();
        return (UnsafeNativeMethods.DTL_READ_W(nameId, readData, ref ioStat, timeOut));
    }

    /// <summary>
    /// Write to a dtl tag
    /// </summary>
    /// <param name="nameId">name id of the tag</param>
    /// <param name="writeData">data buffer to write from</param>
    /// <param name="ioStat">io status of the write operation</param>
    /// <param name="timeOut">timeout in milliseconds</param>
    /// <returns>dtl status</returns>
    public static int DtlWriteW(int nameId, byte[] writeData, ref uint ioStat, int timeOut)
    {
        new UIPermission(UIPermissionWindow.AllWindows).Demand();
        return (UnsafeNativeMethods.DTL_WRITE_W(nameId, writeData, ref ioStat, timeOut));
    }

    /// <summary>
    /// Contains unsafe dtl dll calls
    /// </summary>
    [SuppressUnmanagedCodeSecurityAttribute]
    internal static class UnsafeNativeMethods
    {
        [DllImport("Dtl32.dll")]
        static extern public int DTL_DRIVER_CLOSE(int driver_id, int timeout);

        [DllImport("Dtl32.dll")]
        static extern public void DTL_UNINIT(int driver_id);

        [DllImport("Dtl32.dll")]
        static extern public int DTL_INIT(int table_size);

        [DllImport("Dtl32.dll")]
        static extern public void DTL_ERROR_S(int iostat, StringBuilder msg, int buffsz);

        [DllImport("Dtl32.dll")]
        static extern public int DTL_DRIVER_OPEN(int driver_id, string szDriverName, int timeout);

        [DllImport("DTL32.DLL")]
        static extern public int DTL_VERSION(StringBuilder sb, int maxChars);

        [DllImport("DTL32.DLL")]
        static extern public int DTL_C_DEFINE(ref int name_id, StringBuilder def);

        [DllImport("DTL32.DLL")]
        static extern public int DTL_UNDEF(int name_id);

        [DllImport("DTL32.DLL")]
        static extern public int DTL_READ_W(int name_id, byte[] data, ref uint iostat, int timeout);

        [DllImport("DTL32.DLL")]
        static extern public int DTL_WRITE_W(int name_id, byte[] data, ref uint iostat, int timeout);
    }
    }

    public bool UndefineData()
    {
        int dtlSts = Dtl.DtlUndef(_nameId);
        return (dtlSts == DtlSuccess);
    }

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