Texas Instruments TI-89 Developer's Manual page 1055

Appendix A: System Routines — Symbol Table Utilities
FolderAdd
(continued)
Example: This example creates a temporary folder, adds a locked symbol to it,
dumps the symbol table to the link port (see HeapWalk), looks up the
same symbol just added and finally deletes the temporary folder which
deletes everything in the folder including the locked symbol.
BYTE foldName[] = {0,'9','0','0','0',0};
BYTE symName[] = {0,'s','y','m','1',0};
HSYM hsym1, hsym2;
if (FolderFind(foldName+5) == FL_NOTFOUND)
if( !FolderAdd( foldName+5 ))
ER_throw( ER_MEMORY );
hsym1 = AddSymToFolder( symName+5, foldName+5 );
DerefSym(hsym1)->Flags |= SF_LOCK;
HeapWalk( H_WALK_SYM );
/* lookup same symbol we just added */
hsym2 = FindSymInFolder( symName+5, foldName+5 );
/* HSYMs better match! */
if (hsym1 != hsym2)
ER_THROW( FIRST_INTERNAL_ERR );
FolderDel( foldName+5, FALSE );
HeapWalk( H_WALK_SYM );
TI-89 / TI-92 Plus Developer Guide
/* to show FolderDel will still delete it */
/* dump symbol table to link port */
/* our temporary folder should now be gone */
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Beta Version January 26, 2001