datatype1 (LONG) - input

      Data type of message parameter 1.

      Valid data types are listed below. For data types that are shorter than 4 bytes, the data must be placed in the least-significant bytes, with the most significant bytes nullified (unsigned data types) or signed-extended (signed data types).

      DTYP_BIT16

        See BIT16 data type.
      DTYP_BIT32
        See BIT32 data type.
      DTYP_BIT8
        See BIT8 data type.
      DTYP_BOOL
        See BOOL data type.
      DTYP_LONG
        See LONG data type.
      DTYP_SHORT
        See SHORT data type.
      DTYP_UCHAR
        See UCHAR data type.
      DTYP_ULONG
        See ULONG data type.
      DTYP_USHORT
        See USHORT data type.
      DTYP_P*
        A pointer to a system data type. Note that not all of the system data types that exist in the CPI are valid.
      < -DTYP_USER
        A pointer to a user data type. The user data type must have already been defined via WinRegisterUserDatatype.

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