Teamcenter SOA开发中关于变量声明，转换等代码的新处理方式

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Teamcenter SOA开发中关于变量声明，转换等代码的新处理方式

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1 变量声明
2 t4 S  `/ p- q2 r) d

- j0 Y- s$ G! F; ^! z: K9 J, po Old way
// Declare pointers for an Item, Form and vector of ModelObjects
3 U6 E2 F; J# E3 r+ o4 s! D// initialize to NULL
: J0 n8 `+ [% T" k5 @* ]/ c: C2 G# oItem *theItem = NULL;
+ C4 @/ b4 Y5 I: IForm *theForm = NULL;
' p3 p2 y. y/ Kvector< ModelObject *> objects;
...
- U, {' J; G6 j/ X/ f: R// Use the Item
0 N, Q/ h% z& f$ s4 E' {theForm = theItem->get_item_master_tag();
objects = theItem->get_revision_list();
) I3 A5 j4 v; B, g( Oo New way
/ c$ l$ }3 i( {" F4 V& w// Declare AutoPtr for an Item, Form and vector of ModelObjects
// all AutoPtrs are instantiated as NULL
Teamcenter::Soa::Common::AutoPtr<Item> theItem;
* s3 U. F: b. \1 j  M% tTeamcenter::Soa::Common::AutoPtr<Form> theForm;
% h0 _. O. ?2 w- j2 `" qvector< Teamcenter::Soa::Common::AutoPtr <ModelObject> > objects;
// Use of the ModelObject variables remains unchanged
( s% x$ y0 ?) F# qtheForm = theItem->get_item_master_tag();
! Y, p' q5 ?: Xobjects = theItem->get_revision_list();


) w- \4 S4 w/ G' f8 Q$ r2 类型转换

o Old way
// Declare the variables
3 o" q4 E* V( S7 K1 f: _User *user;
ModelObject *anObj;
Folder *folder;
user = sessionService->login(name,pass, “”,””, descrim ).user;
// Cast to the base ModelObject class
; _" ?) r. f% l- Z% P1 janObj = (ModelObject*)user;
// Cast to a speicfic sub-type, if not NULL
+ \; P6 y1 }' @8 I2 }( R// do something with the new pointer
user = dynamic_cast<User*>(anObj);
* P  K) m2 S, e0 m. Z0 Zif(user != NULL)
{
: q: F& L$ N: ?* b+ i& xfolder = user->get_home_folder();
: m. I$ f( ^5 B* R}
o New way
5 i9 h0 i7 N8 n# o// Declare the variables
Teamcenter::Soa::Common::AutoPtr<User> user;
2 ~. U# o* [6 K3 e6 n8 ^9 [Teamcenter::Soa::Common::AutoPtr<ModelObject> anObj;
8 z% L/ s# E4 c. J$ fTeamcenter::Soa::Common::AutoPtr<Folder> folder;
user = sessionService->login(name,pass, “”,””, descrim ).user;
3 g6 L) H$ B4 X/ \. G$ h! s// Cast to the base ModelObject class
( x& j3 g- d2 n' `anObj = user.cast<ModelObject>();
! `- d9 R8 O7 U( i7 U$ i' P// Put the cast to a speicfic sub-type, in a try/caTCh block
7 ]; s, C* {1 h. [5 _6 G// if std::bad_cast not thrown, then cast was successful
7 H: o( w. D7 S1 L# N& o' n: rtry
{
user = anObj.dyn_cast< User >();
folder = user->get_home_folder();
}
catch(std::bad_cast&){}

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3 关于NULL 赋值

o Old way
. N4 n6 i! C( Z' @/ D// Declare the variables
LoginResponse response;
) _. s7 Y9 F# S/ Q& w- v+ t0 I' HUser * user;
// Call a service that returns a ModelObject (User)
1-28 Services Guide PLM00076 Jresponse = sessionService->login(name,pass, “”,””, descrim );
user = response.user;
// Test that instnace against NULL
4 `1 x: M- ^; qif( user == NULL)
{
...
}
" {9 u, I: Z0 D, c/ ?else
{
$ i- h# @$ X9 \2 p5 C8 n7 z. g! Y. O// Assign NULL to the pointer
user = NULL;
0 R# n2 W# z3 c2 [, j$ p}
' O( R- X0 f+ f! Q! P. |o New way
// Declare the variables
// The service data structures do not change, only
// references to ModelObjects
- F+ ^9 u6 f% l( ~0 JLoginResponse response;
# U9 I9 w5 u$ U: }Teamcenter::Soa::Common::AutoPtr<User> user;
6 [! F. G- J. p& l! j- L1 {// Call a service that returns a ModelObject (User)
response = sessionService->login(name,pass, “”,””, descrim );
user = response.user;
// Since we are not dealing directly with pointers,
// NULL does not make sense here, use the isNull method from the
* ~% v' t4 U" w( e, @// AutoPtr template class.
: c+ k) [- I# l! p& S  I# r# gif( user.isNull())
; z* u* `* v9 `' y/ T! t% U{
7 i4 T& ]8 h8 z% v6 I% l& L- d...
2 l+ g1 [1 c! O1 F}
else
{
// Release the instance and
  J) b, `5 C# L. M3 l2 z  q# [  Zuser.release();
}