GetFieldID

Description

Obtains the internal ID of a class instance variable.

Syntax

GetFieldID(pbclass cls, LPCTSTR fieldName)

1	GetFieldID(pbclass cls, LPCTSTR fieldName)

Argument	Description
cls	The class in which the field resides
fieldName	The instance member name, in lowercase

Return value

pbfieldID or 0xffff if a field ID cannot be found.

Examples

This function obtains the identifier of a class’s visible field,
if it exists, and uses it to set the value of the field:

void CallBack::f_setvisible(IPB_Session* session,
   pbobject dwobj)
{
   pbclass cls;
   IPB_Value* pv;
   pbfieldID fid;
   pbstring strtmp;
   bool isTrue;
   pbboolean isNull;

   cls = session-&gt; GetClass(dwobj);
   fid = session-&gt; GetFieldID(cls, "visible");
   if (fid == kUndefinedFieldID) 
      return;
   isTrue = session-&gt; GetBoolField(dwobj, fid, isNull); 
   if (isTrue)
      session -&gt; SetBoolField(dwobj, fid, false);
    else
      session -&gt; SetBoolField(dwobj, fid, true);
    return ;
}

void CallBack::f_setvisible(IPB_Session* session,

pbobject dwobj)

{

pbclass cls;

IPB_Value* pv;

pbfieldID fid;

pbstring strtmp;

bool isTrue;

pbboolean isNull;

cls = session-> GetClass(dwobj);

fid = session-> GetFieldID(cls, "visible");

if (fid == kUndefinedFieldID)

return;

isTrue = session-> GetBoolField(dwobj, fid, isNull);

if (isTrue)

session -> SetBoolField(dwobj, fid, false);

else

session -> SetBoolField(dwobj, fid, true);

return ;

}

Usage

GetFieldID is one of a set of functions that allows native code to
access the fields of Java objects and get and set their values. You use
GetFieldID to retrieve the value of a field, specifying the class name
and the field name. The field ID returned can be used as an argument to
the related functions.

See also

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