mqSetByteString

The mqSetByteString call either modifies a byte string data item that is already present in the bag, or deletes all existing occurrences of the specified selector and adds a new occurrence at the end of the bag. The data item is usually a user item, but certain system-data items can also be modified.

Syntax for mqSetByteString

mqSetByteString (Bag, Selector, ItemIndex, Bufferlength, Buffer, CompCode, Reason)

Parameters for mqSetByteString

Bag (MQHBAG) - input

Handle of the bag to be set. This must be the handle of a bag created by the user, not the handle of a system bag; MQRC_SYSTEM_BAG_NOT_ALTERABLE results if you specify the handle of a system bag.

Selector (MQLONG) - input

Selector of the item to be modified.

If the selector is less than zero (that is, a system selector), the selector must be one that is supported by the MQAI; MQRC_SELECTOR_NOT_SUPPORTED results if it is not.

If the selector is a supported system selector, but is one that is read only, MQRC_SYSTEM_ITEM_NOT_ALTERABLE results.

If the selector is an alterable system selector, but is always a single-instance selector and the application attempts to create a second instance in the bag, MQRC_MULTIPLE_INSTANCE_ERROR results.

If the selector is zero or greater (that is, a user selector), and the bag was created with the MQCBO_CHECK_SELECTORS option or as an administration bag (MQCBO_ADMIN_BAG), the selector must be in the range MQBA_FIRST through MQBA_LAST; MQRC_SELECTOR_OUT_OF_RANGE results if it is not. If MQCBO_CHECK_SELECTORS was not specified, the selector can be any value zero or greater.

If MQIND_ALL is not specified for the ItemIndex parameter, the specified selector must already be present in the bag; MQRC_SELECTOR_NOT_PRESENT results if it is not.

If MQIND_ALL is not specified for the ItemIndex parameter, the data type of the item must be the same as the data type implied by the call; MQRC_SELECTOR_WRONG_TYPE results if it is not.

ItemIndex (MQLONG) - input

This identifies which occurrence of the item with the specified selector is to be modified. The value must be zero or greater, or one of the special values described in this topic; if it is none of these, MQRC_INDEX_ERROR results.

Zero or greater: The item with the specified index must already be present in the bag; MQRC_INDEX_NOT_PRESENT results if it is not. The index is counted relative to the items in the bag that have the specified selector. For example, if there are five items in the bag with the specified selector, the valid values for ItemIndex are 0 through 4.
MQIND_NONE: This specifies that there must be only one occurrence of the specified selector in the bag. If there is more than one occurrence, MQRC_SELECTOR_NOT_UNIQUE results.
MQIND_ALL: This specifies that all existing occurrences of the specified selector (if any) are to be deleted from the bag, and a new occurrence of the selector created at the end of the bag.

BufferLength (MQLONG) - input

The length in bytes of the byte string contained in the Buffer parameter. The value must be zero or greater.

Buffer (MQBYTE x BufferLength) - input

Buffer containing the byte string. The length is given by the BufferLength parameter. If zero is specified for BufferLength, the null pointer can be specified for the address of the Buffer parameter; in all other cases, a valid (nonnull) address must be specified for the Buffer parameter.

CompCode (MQLONG) - output

Completion code.

Reason (MQLONG) - output

Reason code qualifying CompCode.

The following reason codes indicating error conditions can be returned from the mqSetByteString call:

MQRC_BUFFER_ERROR: Buffer parameter not valid (invalid parameter address or buffer not completely accessible).
MQRC_BUFFER_LENGTH_ERROR: Buffer length not valid.
MQRC_HBAG_ERROR: Bag handle not valid.
MQRC_INDEX_ERROR: Index not valid (index negative and not MQIND_NONE or MQIND_ALL).
MQRC_INDEX_NOT_PRESENT: No item with the specified index is present within the bag for the selector given.
MQRC_MULTIPLE_INSTANCE_ERROR: Multiple instances of system selector not valid.
MQRC_SELECTOR_NOT_PRESENT: No item with the specified selector is present within the bag.
MQRC_SELECTOR_NOT_SUPPORTED: Specified system selector not supported by the MQAI.
MQRC_SELECTOR_NOT_UNIQUE: MQIND_NONE specified when more than one occurrence of the specified selector is present in the bag.
MQRC_SELECTOR_OUT_OF_RANGE: Selector not within valid range for call.
MQRC_SELECTOR_WRONG_TYPE: Data item has wrong data type for call.
MQRC_STORAGE_NOT_AVAILABLE: Insufficient storage available.
MQRC_SYSTEM_BAG_NOT_ALTERABLE: System bag cannot be altered or deleted.
MQRC_SYSTEM_ITEM_NOT_ALTERABLE: System item is read-only and cannot be altered.

C language invocation for mqSetByteString

mqSetByteString (Bag, Selector, ItemIndex, BufferLength, Buffer,
&CompCode, &Reason);

Declare the parameters as follows:

MQHBAG   Bag;           /* Bag handle */
MQLONG   Selector;      /* Selector */
MQLONG   ItemIndex;     /* Item index */
MQLONG   BufferLength;  /* Buffer length */
PMQBYTE  Buffer;        /* Buffer containing string */
MQLONG   CompCode;      /* Completion code */
MQLONG   Reason;        /* Reason code qualifying CompCode */

Visual Basic invocation for mqSetByteString

(Supported on Windows only.)

mqSetByteString Bag, Selector, ItemIndex, BufferLength, Buffer,
CompCode, Reason

Declare the parameters as follows:

Dim Bag          As Long   'Bag handle'
Dim Selector     As Long   'Selector'
Dim ItemIndex    As Long   'Item index'
Dim BufferLength As Long   'Buffer length'
Dim Buffer       As Byte   'Buffer containing string'
Dim CompCode     As Long   'Completion code'
Dim Reason       As Long   'Reason code qualifying CompCode'