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TIBCO Rendezvous® 8.7.0

# Update Scalar

Convenience Functions

## Declaration

    tibrv_status tibrvMsg_Updatescalar_type(
       tibrvMsg       message,
       const char*    fieldName,
       scalar_type     value);
    tibrv_status tibrvMsg_Updatescalar_typeEx(
       tibrvMsg       message,
       const char*    fieldName,
       scalar_type     value,
        tibrv_u16     fieldId);

## Purpose

Update a field containing a scalar value.

## Remarks

Each convenience function in this family locates a field (by name or identifier) and updates its data.

The type of the existing field (within the message) and the type of the updating `value` must match.

Function Name | Value Type | Type Description
`tibrvMsg_Update` `Bool` | `tibrv_``bool` | boolean scalar
`tibrvMsg_Update` `I8` | `tibrv_``i8` | 8-bit integer
`tibrvMsg_Update` `U8` | `tibrv_``u8` | 8-bit unsigned integer
`tibrvMsg_Update` `I16` | `tibrv_``i16` | 16-bit integer
`tibrvMsg_Update` `U16` | `tibrv_``u16` | 16-bit unsigned integer
`tibrvMsg_Update` `I32` | `tibrv_``i32` | 32-bit integer
`tibrvMsg_Update` `U32` | `tibrv_``u32` | 32-bit unsigned integer
`tibrvMsg_Update` `I64` | `tibrv_``i64` | 64-bit integer
`tibrvMsg_Update` `U64` | `tibrv_``u64` | 64-bit unsigned integer
`tibrvMsg_Update` `F32` | `tibrv_``f32` | 32-bit floating point
`tibrvMsg_Update` `F64` | `tibrv_``f64` | 64-bit floating point
`tibrvMsg_Update` `IPAddr32` | `tibrv_``ipaddr32` | 4-byte IP address
`tibrvMsg_Update` `IPPort16` | `tibrv_``ipport16` | 2-byte IP port

Parameter | Description
`message` | Update the specified field of this message.
`fieldName` | Update a field with this name.
`value` | Update the message field to this value (which may be a literal or stored in a variable). The function copies the value into the new message field.
`fieldId` | Update the field with this identifier. Zero is a special value that signifies no field identifier. It is illegal to add a field that has both a `NULL` field name, and a non-zero field identifier.

## See Also

Field Names and Field Identifiers

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