Teamcenter SOA开发中关于变量声明，转换等代码的新处理方式

admin

Teamcenter SOA开发中关于变量声明，转换等代码的新处理方式
6 q2 _4 U8 @' a: h/ I" [* w
( q' \. ?% D) d
1 变量声明


4 E: P" r/ |8 }9 k$ |+ g0 ro Old way
// Declare pointers for an Item, Form and vector of ModelObjects
// initialize to NULL
Item *theItem = NULL;
$ L1 }* k( T8 Z. C/ ?* f! BForm *theForm = NULL;
vector< ModelObject *> objects;
...
8 z" @! q2 m7 r; i, ]5 B' A// Use the Item
theForm = theItem->get_item_master_tag();
objects = theItem->get_revision_list();
o New way
// Declare AutoPtr for an Item, Form and vector of ModelObjects
// all AutoPtrs are instantiated as NULL
6 _* X9 D0 X; @1 e& yTeamcenter::Soa::Common::AutoPtr<Item> theItem;
; L$ w9 Z2 r- E1 z( a  tTeamcenter::Soa::Common::AutoPtr<Form> theForm;
0 v5 d; ~& s: D, e& Ivector< Teamcenter::Soa::Common::AutoPtr <ModelObject> > objects;
// Use of the ModelObject variables remains unchanged
theForm = theItem->get_item_master_tag();
1 r; I' h( J2 fobjects = theItem->get_revision_list();


2 类型转换
( k- v) m- N) B2 W! `4 i
o Old way
4 r7 J( u( Z& i1 h// Declare the variables
1 W7 e8 w) H+ q. ^$ iUser *user;
% K7 s0 Z( S1 _8 R5 [" vModelObject *anObj;
Folder *folder;
user = sessionService->login(name,pass, “”,””, descrim ).user;
, z0 m9 N- V: ]1 I// Cast to the base ModelObject class
anObj = (ModelObject*)user;
// Cast to a speicfic sub-type, if not NULL
// do something with the new pointer
user = dynamic_cast<User*>(anObj);
if(user != NULL)
{
, H( H+ Y  Q7 U5 F! ?+ Lfolder = user->get_home_folder();
}
4 s- m9 L5 X+ @5 w( Q% L6 Go New way
. _( g6 D9 T) m* Q2 ^/ F// Declare the variables
; V3 i, p0 A6 D. L% |; CTeamcenter::Soa::Common::AutoPtr<User> user;
7 V% o6 S# o# q3 ZTeamcenter::Soa::Common::AutoPtr<ModelObject> anObj;
4 x7 k5 w; k! s. u* ~Teamcenter::Soa::Common::AutoPtr<Folder> folder;
7 r% F. o( S6 ^& B( C3 j/ y) huser = sessionService->login(name,pass, “”,””, descrim ).user;
// Cast to the base ModelObject class
anObj = user.cast<ModelObject>();
6 {! v, e4 W! @" E! [" ^// Put the cast to a speicfic sub-type, in a try/caTCh block
// if std::bad_cast not thrown, then cast was successful
7 x3 d3 U9 h. s) Qtry
{
# _: H4 F6 w9 A& u- L7 Ouser = anObj.dyn_cast< User >();
1 h0 `% P  ^) Z3 ]/ }, efolder = user->get_home_folder();
}
; d( C* B0 W1 F. M2 vcatch(std::bad_cast&){}
4 h) e" b( D9 Q5 c- ]& C. @
2 F% m% p7 i  g7 v( q
# l2 O) ]5 Y9 S: E7 F1 h! L3 关于NULL 赋值
* q) p7 ~* w7 J' A) J8 O9 ]( k
o Old way
// Declare the variables
LoginResponse response;
User * user;
// Call a service that returns a ModelObject (User)
4 X  x$ d& c: y1-28 Services Guide PLM00076 Jresponse = sessionService->login(name,pass, “”,””, descrim );
; s6 R) ?0 A/ F- \" K/ D, S! ?user = response.user;
// Test that instnace against NULL
4 D  ~  T" L/ T% rif( user == NULL)
{
! F3 l2 i7 Y) `+ e...
}
$ |' ]: k0 W: \* B. |4 Celse
& |, b5 ]. {3 P5 D{
  b* K: |7 @7 h& j// Assign NULL to the pointer
. d2 ?; R, s. r/ f. j" b% W9 Iuser = NULL;
}
- [: g( o$ k( S  [, c7 \o New way
// Declare the variables
// The service data structures do not change, only
// references to ModelObjects
7 M* k! i( q% v1 m$ _" cLoginResponse response;
+ j& j. N; g0 M6 `& B: c' l, HTeamcenter::Soa::Common::AutoPtr<User> user;
$ Y0 y/ p# M) o8 ^: H* W// Call a service that returns a ModelObject (User)
. |0 W; U1 a9 H: ~- Yresponse = sessionService->login(name,pass, “”,””, descrim );
user = response.user;
// Since we are not dealing directly with pointers,
. r! W$ E& `2 c2 o3 f" ~8 G// NULL does not make sense here, use the isNull method from the
// AutoPtr template class.
: R4 L  j% \- N) g# tif( user.isNull())
, f! I8 F' V6 m, Q) q{
...
. ]% B9 v* @8 k% X: y2 s}
else
# s% r6 S- x( u) v" n- }$ c8 Q, S{
// Release the instance and
0 h* T( a! Z* f( S; j: e. R! Tuser.release();
}

6 S9 B5 `7 h5 O4 F
2 ~0 W) P7 a" j- l- z$ @% I