GacUI从pdb生成反射和dll接口首战告捷
从pdb读取类声明花了很久，从类声明产生反射和dll接口花的时间更久啊，很多细节问题需要解决。文章的代码已经保存在了 Vczh Library++3.0（\Tools\Release\SideProjects\GacUI\GacUI.sln）。
反射和dll接口的工作进行了一半。现在把类、函数、属性和各种类型都声称了出来，但是还欠缺函数的实现。反射使用了lazy的做法，当访问到一个Type的成员的时候，才会对Type进行初始化。不过初始化的内容也很简单，只是把一些对方放倒一个列表里面，从而当你想知道一个Type有哪些属性和函数什么的可以很快查出来。dll的接口也差不多。现在分别展示反射和dll接口的代码。首先是反射的：
下面是GuiBoundsComposition类型的反射。我们可以看到gacui_tpimp_GuiBoundsComposition继承自了TypeDescriptor。当我们调用GetTypeProvider->FindType(L"GuiBoundsComposition")->GetTypeDescriptor()的时候，就会返回下面的这个对象。
1
class
gacui_tpimp_GuiBoundsComposition :
public
TypeDescriptor
2 {
3 protected :
4 void FillTypeContent()
5 {
6 AddBaseType((gacui_tpimp_type_cache_table.cache_GuiGraphicsSite));
7 AddConstructor(
8 ( new MethodDescriptor(L " GuiBoundsComposition " , IMemberDescriptor::Normal))
9 -> ReturnType((gacui_tpimp_type_cache_table.cache_GuiBoundsComposition) -> GetPointerType())
10 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_GuiBoundsComposition_0))
11 );
12 AddMethod(
13 ( new MethodDescriptor(L " GetAffectionFromParent " , IMemberDescriptor::Virtual))
14 -> ReturnType((gacui_tpimp_type_cache_table.cache_GuiGraphicsComposition_member_ParentSizeAffection))
15 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_GetAffectionFromParent_1))
16 );
17 AddMethod(
18 ( new MethodDescriptor(L " GetPreferredBounds " , IMemberDescriptor::Virtual))
19 -> ReturnType((gacui_tpimp_type_cache_table.cache_Rect))
20 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_GetPreferredBounds_2))
21 );
22 AddMethod(
23 ( new MethodDescriptor(L " GetBounds " , IMemberDescriptor::Virtual))
24 -> ReturnType((gacui_tpimp_type_cache_table.cache_Rect))
25 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_GetBounds_3))
26 );
27 AddMethod(
28 ( new MethodDescriptor(L " ClearAlignmentToParent " , IMemberDescriptor::Normal))
29 -> ReturnType((gacui_tpimp_type_cache_table.primary_Void))
30 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_ClearAlignmentToParent_4))
31 );
32 AddMethod(
33 ( new MethodDescriptor(L " IsAlignedToParent " , IMemberDescriptor::Normal))
34 -> ReturnType((gacui_tpimp_type_cache_table.primary_Bool))
35 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_IsAlignedToParent_5))
36 );
37 AddMethod(
38 ( new MethodDescriptor(L " operator= " , IMemberDescriptor::Normal))
39 -> ReturnType((gacui_tpimp_type_cache_table.cache_GuiBoundsComposition) -> GetReferenceType())
40 -> Parameter(L " value " , (gacui_tpimp_type_cache_table.cache_GuiBoundsComposition) -> GetConstReferenceType())
41 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_operator_assign_6))
42 );
43 AddMethod(
44 ( new MethodDescriptor(L " SetBounds " , IMemberDescriptor::Normal))
45 -> ReturnType((gacui_tpimp_type_cache_table.primary_Void))
46 -> Parameter(L " value " , (gacui_tpimp_type_cache_table.cache_Rect))
47 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_SetBounds_7))
48 );
49 AddProperty(
50 ( new PropertyDescriptor(L " AlignmentToParent " , IMemberDescriptor::Normal))
51 -> PropertyType((gacui_tpimp_type_cache_table.cache_Margin))
52 -> Getter(
53 ( new MethodDescriptor(L " GetAlignmentToParent " , IMemberDescriptor::Normal))
54 -> ReturnType((gacui_tpimp_type_cache_table.cache_Margin))
55 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_GetAlignmentToParent_8))
56 )
57 -> Setter(
58 ( new MethodDescriptor(L " SetAlignmentToParent " , IMemberDescriptor::Normal))
59 -> ReturnType((gacui_tpimp_type_cache_table.primary_Void))
60 -> Parameter(L " value " , (gacui_tpimp_type_cache_table.cache_Margin))
61 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_SetAlignmentToParent_9))
62 )
63 );
64 AddProperty(
65 ( new PropertyDescriptor(L " BoundsChanged " , IMemberDescriptor::Normal))
66 -> PropertyType((gacui_tpimp_type_cache_table.cache_GuiGraphicsEvent_of_GuiEventArgs))
67 -> Getter(
68 ( new MethodDescriptor(L " get_BoundsChanged " , IMemberDescriptor::Normal))
69 -> ReturnType((gacui_tpimp_type_cache_table.cache_GuiGraphicsEvent_of_GuiEventArgs))
70 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_get_BoundsChanged_10))
71 )
72 -> Setter(
73 ( new MethodDescriptor(L " set_BoundsChanged " , IMemberDescriptor::Normal))
74 -> ReturnType((gacui_tpimp_type_cache_table.primary_Void))
75 -> Parameter(L " value " , (gacui_tpimp_type_cache_table.cache_GuiGraphicsEvent_of_GuiEventArgs))
76 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_set_BoundsChanged_11))
77 )
78 );
79 }
80
81 private :
82
83 static DescriptableValue method_handler_GuiBoundsComposition_0( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
84 {
85 throw 0 ;
86 }
87
88 static DescriptableValue method_handler_GetAffectionFromParent_1( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
89 {
90 throw 0 ;
91 }
92
93 static DescriptableValue method_handler_GetPreferredBounds_2( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
94 {
95 throw 0 ;
96 }
97
98 static DescriptableValue method_handler_GetBounds_3( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
99 {
100 throw 0 ;
101 }
102
103 static DescriptableValue method_handler_ClearAlignmentToParent_4( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
104 {
105 throw 0 ;
106 }
107
108 static DescriptableValue method_handler_IsAlignedToParent_5( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
109 {
110 throw 0 ;
111 }
112
113 static DescriptableValue method_handler_operator_assign_6( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
114 {
115 throw 0 ;
116 }
117
118 static DescriptableValue method_handler_SetBounds_7( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
119 {
120 throw 0 ;
121 }
122
123 static DescriptableValue method_handler_GetAlignmentToParent_8( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
124 {
125 throw 0 ;
126 }
127
128 static DescriptableValue method_handler_SetAlignmentToParent_9( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
129 {
130 throw 0 ;
131 }
132
133 static DescriptableValue method_handler_get_BoundsChanged_10( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
134 {
135 throw 0 ;
136 }
137
138 static DescriptableValue method_handler_set_BoundsChanged_11( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
139 {
140 throw 0 ;
141 }
142
143 public :
144 };
2 {
3 protected :
4 void FillTypeContent()
5 {
6 AddBaseType((gacui_tpimp_type_cache_table.cache_GuiGraphicsSite));
7 AddConstructor(
8 ( new MethodDescriptor(L " GuiBoundsComposition " , IMemberDescriptor::Normal))
9 -> ReturnType((gacui_tpimp_type_cache_table.cache_GuiBoundsComposition) -> GetPointerType())
10 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_GuiBoundsComposition_0))
11 );
12 AddMethod(
13 ( new MethodDescriptor(L " GetAffectionFromParent " , IMemberDescriptor::Virtual))
14 -> ReturnType((gacui_tpimp_type_cache_table.cache_GuiGraphicsComposition_member_ParentSizeAffection))
15 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_GetAffectionFromParent_1))
16 );
17 AddMethod(
18 ( new MethodDescriptor(L " GetPreferredBounds " , IMemberDescriptor::Virtual))
19 -> ReturnType((gacui_tpimp_type_cache_table.cache_Rect))
20 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_GetPreferredBounds_2))
21 );
22 AddMethod(
23 ( new MethodDescriptor(L " GetBounds " , IMemberDescriptor::Virtual))
24 -> ReturnType((gacui_tpimp_type_cache_table.cache_Rect))
25 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_GetBounds_3))
26 );
27 AddMethod(
28 ( new MethodDescriptor(L " ClearAlignmentToParent " , IMemberDescriptor::Normal))
29 -> ReturnType((gacui_tpimp_type_cache_table.primary_Void))
30 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_ClearAlignmentToParent_4))
31 );
32 AddMethod(
33 ( new MethodDescriptor(L " IsAlignedToParent " , IMemberDescriptor::Normal))
34 -> ReturnType((gacui_tpimp_type_cache_table.primary_Bool))
35 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_IsAlignedToParent_5))
36 );
37 AddMethod(
38 ( new MethodDescriptor(L " operator= " , IMemberDescriptor::Normal))
39 -> ReturnType((gacui_tpimp_type_cache_table.cache_GuiBoundsComposition) -> GetReferenceType())
40 -> Parameter(L " value " , (gacui_tpimp_type_cache_table.cache_GuiBoundsComposition) -> GetConstReferenceType())
41 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_operator_assign_6))
42 );
43 AddMethod(
44 ( new MethodDescriptor(L " SetBounds " , IMemberDescriptor::Normal))
45 -> ReturnType((gacui_tpimp_type_cache_table.primary_Void))
46 -> Parameter(L " value " , (gacui_tpimp_type_cache_table.cache_Rect))
47 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_SetBounds_7))
48 );
49 AddProperty(
50 ( new PropertyDescriptor(L " AlignmentToParent " , IMemberDescriptor::Normal))
51 -> PropertyType((gacui_tpimp_type_cache_table.cache_Margin))
52 -> Getter(
53 ( new MethodDescriptor(L " GetAlignmentToParent " , IMemberDescriptor::Normal))
54 -> ReturnType((gacui_tpimp_type_cache_table.cache_Margin))
55 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_GetAlignmentToParent_8))
56 )
57 -> Setter(
58 ( new MethodDescriptor(L " SetAlignmentToParent " , IMemberDescriptor::Normal))
59 -> ReturnType((gacui_tpimp_type_cache_table.primary_Void))
60 -> Parameter(L " value " , (gacui_tpimp_type_cache_table.cache_Margin))
61 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_SetAlignmentToParent_9))
62 )
63 );
64 AddProperty(
65 ( new PropertyDescriptor(L " BoundsChanged " , IMemberDescriptor::Normal))
66 -> PropertyType((gacui_tpimp_type_cache_table.cache_GuiGraphicsEvent_of_GuiEventArgs))
67 -> Getter(
68 ( new MethodDescriptor(L " get_BoundsChanged " , IMemberDescriptor::Normal))
69 -> ReturnType((gacui_tpimp_type_cache_table.cache_GuiGraphicsEvent_of_GuiEventArgs))
70 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_get_BoundsChanged_10))
71 )
72 -> Setter(
73 ( new MethodDescriptor(L " set_BoundsChanged " , IMemberDescriptor::Normal))
74 -> ReturnType((gacui_tpimp_type_cache_table.primary_Void))
75 -> Parameter(L " value " , (gacui_tpimp_type_cache_table.cache_GuiGraphicsEvent_of_GuiEventArgs))
76 -> Handler(MethodDescriptor::HandlerFuncType( & gacui_tpimp_GuiBoundsComposition::method_handler_set_BoundsChanged_11))
77 )
78 );
79 }
80
81 private :
82
83 static DescriptableValue method_handler_GuiBoundsComposition_0( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
84 {
85 throw 0 ;
86 }
87
88 static DescriptableValue method_handler_GetAffectionFromParent_1( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
89 {
90 throw 0 ;
91 }
92
93 static DescriptableValue method_handler_GetPreferredBounds_2( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
94 {
95 throw 0 ;
96 }
97
98 static DescriptableValue method_handler_GetBounds_3( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
99 {
100 throw 0 ;
101 }
102
103 static DescriptableValue method_handler_ClearAlignmentToParent_4( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
104 {
105 throw 0 ;
106 }
107
108 static DescriptableValue method_handler_IsAlignedToParent_5( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
109 {
110 throw 0 ;
111 }
112
113 static DescriptableValue method_handler_operator_assign_6( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
114 {
115 throw 0 ;
116 }
117
118 static DescriptableValue method_handler_SetBounds_7( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
119 {
120 throw 0 ;
121 }
122
123 static DescriptableValue method_handler_GetAlignmentToParent_8( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
124 {
125 throw 0 ;
126 }
127
128 static DescriptableValue method_handler_SetAlignmentToParent_9( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
129 {
130 throw 0 ;
131 }
132
133 static DescriptableValue method_handler_get_BoundsChanged_10( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
134 {
135 throw 0 ;
136 }
137
138 static DescriptableValue method_handler_set_BoundsChanged_11( const DescriptableValue & thisObject, const collections::IReadonlyList < DescriptableValue >& parameters)
139 {
140 throw 0 ;
141 }
142
143 public :
144 };
如果反射出来的函数不能被调用那自然是没有意义的，所以AddMethod的时候会提供一个handler，而handler就是下面的静态成员函数了。静态成员函数的实现就是从thisObject拿到GuiBoundsComposition*之后，去调用对应的函数。这个部分是可以自动生成的，只是现在还没写完。
反射只是一部分，dll的接口也要生成，因为GacUI的实现使用了很多模板和自定义异常，而模板和异常跨越dll边界是很危险的，所以需要用自动生成的代码来把这些东西隔离开（包括一场），从而实现安全调用。下面就是自动生成的dll接口代码，而同样，函数也暂时没有实现的内容：
1
/*
**********************************************************************
2 GuiBoundsComposition
3 ********************************************************************** */
4
5 class GACUI_API GuiBoundsComposition : public GuiGraphicsSite
6 {
7 public :
8
9 public :
10
11 static rptr < GuiBoundsComposition > Create();
12
13 GuiGraphicsComposition :: ParentSizeAffection GetAffectionFromParent();
14 Rect GetPreferredBounds();
15 Rect GetBounds();
16 void ClearAlignmentToParent();
17 bool IsAlignedToParent();
18 rptr < GuiBoundsComposition > operator = (rptr < GuiBoundsComposition > value);
19 void SetBounds(Rect value);
20
21 Margin GetAlignmentToParent();
22 void SetAlignmentToParent(Margin value);
23 GuiGraphicsEvent_of_GuiEventArgs on_BoundsChanged();
24
25 };
26
27 /* **********************************************************************
28 GuiBoundsComposition
29 ********************************************************************** */
30
31 rptr < GuiBoundsComposition > GuiBoundsComposition::Create()
32 {
33 throw 0 ;
34 }
35
36 GuiGraphicsComposition :: ParentSizeAffection GuiBoundsComposition::GetAffectionFromParent()
37 {
38 throw 0 ;
39 }
40
41 Rect GuiBoundsComposition::GetPreferredBounds()
42 {
43 throw 0 ;
44 }
45
46 Rect GuiBoundsComposition::GetBounds()
47 {
48 throw 0 ;
49 }
50
51 void GuiBoundsComposition::ClearAlignmentToParent()
52 {
53 throw 0 ;
54 }
55
56 bool GuiBoundsComposition::IsAlignedToParent()
57 {
58 throw 0 ;
59 }
60
61 rptr < GuiBoundsComposition > GuiBoundsComposition:: operator = (rptr < GuiBoundsComposition > value)
62 {
63 throw 0 ;
64 }
65
66 void GuiBoundsComposition::SetBounds(Rect value)
67 {
68 throw 0 ;
69 }
70
71 Margin GuiBoundsComposition::GetAlignmentToParent()
72 {
73 throw 0 ;
74 }
75 void GuiBoundsComposition::SetAlignmentToParent(Margin value)
76 {
77 throw 0 ;
78 }
79
80 GuiGraphicsEvent_of_GuiEventArgs GuiBoundsComposition::on_BoundsChanged()
81 {
82 throw 0 ;
83 }
2 GuiBoundsComposition
3 ********************************************************************** */
4
5 class GACUI_API GuiBoundsComposition : public GuiGraphicsSite
6 {
7 public :
8
9 public :
10
11 static rptr < GuiBoundsComposition > Create();
12
13 GuiGraphicsComposition :: ParentSizeAffection GetAffectionFromParent();
14 Rect GetPreferredBounds();
15 Rect GetBounds();
16 void ClearAlignmentToParent();
17 bool IsAlignedToParent();
18 rptr < GuiBoundsComposition > operator = (rptr < GuiBoundsComposition > value);
19 void SetBounds(Rect value);
20
21 Margin GetAlignmentToParent();
22 void SetAlignmentToParent(Margin value);
23 GuiGraphicsEvent_of_GuiEventArgs on_BoundsChanged();
24
25 };
26
27 /* **********************************************************************
28 GuiBoundsComposition
29 ********************************************************************** */
30
31 rptr < GuiBoundsComposition > GuiBoundsComposition::Create()
32 {
33 throw 0 ;
34 }
35
36 GuiGraphicsComposition :: ParentSizeAffection GuiBoundsComposition::GetAffectionFromParent()
37 {
38 throw 0 ;
39 }
40
41 Rect GuiBoundsComposition::GetPreferredBounds()
42 {
43 throw 0 ;
44 }
45
46 Rect GuiBoundsComposition::GetBounds()
47 {
48 throw 0 ;
49 }
50
51 void GuiBoundsComposition::ClearAlignmentToParent()
52 {
53 throw 0 ;
54 }
55
56 bool GuiBoundsComposition::IsAlignedToParent()
57 {
58 throw 0 ;
59 }
60
61 rptr < GuiBoundsComposition > GuiBoundsComposition:: operator = (rptr < GuiBoundsComposition > value)
62 {
63 throw 0 ;
64 }
65
66 void GuiBoundsComposition::SetBounds(Rect value)
67 {
68 throw 0 ;
69 }
70
71 Margin GuiBoundsComposition::GetAlignmentToParent()
72 {
73 throw 0 ;
74 }
75 void GuiBoundsComposition::SetAlignmentToParent(Margin value)
76 {
77 throw 0 ;
78 }
79
80 GuiGraphicsEvent_of_GuiEventArgs GuiBoundsComposition::on_BoundsChanged()
81 {
82 throw 0 ;
83 }
dll接口的部分生成比较简单，因为类似int这样的类型可以直接使用，而不像反射一样还得给一个对象来告诉你这个是int。
之所要这两部分，是因为GacUI不仅允许用户直接操作某个控件，也需要同时允许界面使用XML描述，或者以后对脚本的支持。C++访问控件不需要反射，而XML和脚本则需要。XML描述界面是很重要的，因为这不仅可以用来支持皮肤、资源等高级抽象，还可以围绕XML开发一个跟Blend Expression（当然不可能有那么高级= =b）的GUI编辑器。
接下来会继续给这些函数生成实现。这部分完成之后，GacUI就真正可以通过dll的方法来运行了。一旦把功能都坐进了dll，那么实现类似visual studio那样的可以把界面插件分散在各个dll里面的编辑器框架，也消除了技术上的困难。