TipcMsgAppendReal8ArrayPtr

Name

TipcMsgAppendReal8ArrayPtr — use a pointer to append a field containing an array of REAL8 fields to a message

Synopsis

T_BOOL TipcMsgAppendReal8ArrayPtr(msg, real8_array_data, array_size, 
                                  field_return) 
T_IPC_MSG msg; 
T_REAL8 *real8_array_data; 
T_INT4 array_size; 
T_IPC_MSG_FIELD *field_return; 

Arguments

msg — message to append field to

real8_array_data — data for new message field

array_size — number of elements in real8_array_data

field_return — optional location to return field (use NULL if not needed)

Return Values

TRUE if the field was successfully appended to the message, FALSE otherwise.

Diagnostics

If TipcMsgAppendReal8ArrayPtr fails, it returns FALSE and sets the global SmartSockets error number to one of:

Description

TipcMsgAppendReal8ArrayPtr appends an eight-byte real array (REAL8_ARRAY) field containing real8_array_data to the end of a message’s data. This function does not make a copy of the array. Instead, the supplied pointer to the array is entered directly into the new message field’s internal data structure. The caller is responsible for making sure that the pointer remains valid for the lifetime of the message field, and for freeing it, if necessary, when the message field has been destroyed.

One advantage of TipcMsgAppendReal8ArrayPtr over TipcMsgAppendReal8Array is that the array data can be modified after the field is appended, but before the message is sent. Another advantage is that the overhead of one copy operation is avoided. The data is still copied into the connection write buffer when the message is sent.

To update the pointer to point to a new memory location, use the TipcMsgFieldUpdateReal8ArrayPtr function.

See Also

TipcMsgAppendReal8Array, TipcMsgNextReal8Array, TipcMsgFieldSetSize, TipcMsgFieldUpdateReal8ArrayPtr

Examples

This example creates a message and appends a REAL8_ARRAY field:

T_IPC_MT mt; 
T_IPC_MSG msg; 
T_REAL8 data[10]; 
T_IPC_MSG_FIELD field; 
 
#define USER_MT_REAL8_ARRAY_TEST 100 
mt = TipcMtCreate("real8_array_test", USER_MT_REAL8_ARRAY_TEST, 
                  "real8_array"); 
if (mt == NULL) { 
  return;  /* error */ 
} 
 
msg = TipcMsgCreate(mt) 
if (msg == NULL) { 
  return;  /* error */ 
} 
 
/* An RTclient would typically set the destination of */ 
/* a message at this point by calling TipcMsgSetDest. */ 
 
if (!TipcMsgAppendReal8ArrayPtr(msg, data, 0, &field)) { 
  return;  /* error */ 
} 
 
data[0] = 56.1; 
data[1] = 57.2; 
if (!TipcMsgFieldSetSize(field, 2)) { 
  return;  /* error */ 
} 
 
/* A process would typically send a message at this point by */ 
/* calling TipcConnMsgSend or TipcSrvMsgSend. */ 
 
/* A process would typically destroy a message at this point by */ 
/* calling TipcMsgDestroy. */