Assuming you know how to program in LISP and in the spirit of teaching you how to fish, the procedure that I use is to create the fields manually and then examine them. For example, when editing your mtext entity with the current contents "field". Add two object fields. When selecting the block reference, the choices will either be properties of the block itself or its attributes. Use the insert field twice, once for each attrbute you want to concatenate together. The resulting field code could be returned either by using vla-fieldcode or by copying the field for each attribute directly from the field dialog. For your block reference, it would be:
"%<\\AcObjProp Object(%<\\_ObjId 929430624>%).TextString>%%<\\AcObjProp Object(%<\\_ObjId 929430656>%).TextString>%"
The advantage of using vla-field code is that it returns a lisp formatted text string. To create a field yourself using LISP, simply create text entity as @Moshe-A demonstrated and then put the textstring to be the fieldcode.
(vla-put-textsring
<mtext vla-object>
(STRCAT "%<\\AcObjProp Object(%<\\_ObjId "
(ITOA <objectid integer for first attribute>)
">%).TextString>%%<\\AcObjProp Object(%<\\_ObjId "
(ITOA <objectid integer for second attribute> ">%).TextString>%" )
)
)
The objectid of a vla-object can be obtained by using (vla-get-objectid <vla-object>)
To get a vla-object from a selection, try (setq object (vlax-ename->vla-object(car(entsel)))). Add as much error handling as necessary.
Architect, Registered NC, VA, SC, & GA.
