hab (HAB) - input

Anchor-block handle.

msgid (ULONG) - input

Message identifier.

This must not be less than WM_USER, and must not have been defined previously.

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.

dir1 (LONG) - input

Direction of message parameter 1.

If the message parameter is a pointer, the direction values listed below apply to the contents of the storage location pointed at, as well as to the message parameter itself.

RUM_IN

Input parameter (inspected by the recipient of the message, but not altered)
RUM_OUT
Output parameter (altered by the recipient of the message, without inspecting its value first)
RUM_INOUT
Input/output parameter (inspected by the recipient of the message, and then altered).

datatype2 (LONG) - input

Data type of message parameter 2.

See the description of datatype1.

dir2 (LONG) - input

Direction of message parameter 2.

See the description of dir1.

datatyper (LONG) - input

Data type of message reply.

See the description of datatype1. The message reply is always an output parameter.

rc (BOOL) - returns

Success indicator.

TRUE

Successful completion
FALSE
Error occurred.

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