ade_expreval

Evaluates an expression.

struct resbuf*

ade_expreval(

ads_name ename,

char* expr,

char* type);

Returns the value of the expression or NULL.

ename	Optional drawing object name. Required if the expression uses object properties or data.
expr	Expression to evaluate.
type	Expected return type: "short", "long", "real", "string", or "point".

The following sample displays the .Length property of a pline entity which has been converted to Meters.

A selection set of entities from the current drawing is created using acedSSGet(). Each entity is passed to ade_expreval()along with any additional parameters. The resbuf returned by ade_expreval() contains the converted result which is then displayed. Then it releases the resbuf, as required.

ads_name ename;
ads_name selectionSet;
char* pszExpr = "(* .LENGTH .3048)";
char* pszReturnType = "real";
struct resbuf* pEntLengthToM = NULL;
acedSSGet("x", NULL, NULL, NULL, selectionSet);
long ssLength;
acedSSLength( selectionSet, &ssLength; );
for( int i = 0; i < ssLength; ++i )
{
    if( acedSSName(selectionSet, i, ename) == RTNORM )
    {
        pEntLengthToM = ade_expreval(ename, pszExpr, pszReturnType);
        if (pEntLengthToM != NULL){
            struct resbuf* rb = pEntLengthToM;
            while(rb != NULL) {
                acutPrintf(
                    "\nThe current entities .LENGTH value converted to Meters is: %.4lf"
                    , rb->resval.rreal);
                rb = rb->rbnext;
            }
        }
    }
}
acutRelRb(pEntLengthToM);