今天做好了Vczh Free Script 2.0的一個新插件，這個插件可以直接插入class并接管成員調用、構造函數和析構函數等調用。
一、在C++中插入一個類VczhClass和函數write、writeln、read和collect：
1 class VczhClass : public FsClass
2 {
3 protected:
4 public:
5 VczhClass(FsPlugin* Plugin):FsClass(Plugin,L"interpreter_debug")
6 {
7 }
8
9 FsePluginInvoke CallConstructor(int ClassID , FsObject* Parameters , int ParamCount , FsObject& ErrorMessage , FsObject& Result)
10 {
11 GetConsole()->Write(L"VczhClass is creating.\r\n");
12 AddExternalMember(ClassID,L"MethodA",0);
13 AddExternalMember(ClassID,L"MethodB",1);
14 AddExternalMember(ClassID,L"MethodC",2);
15 return fsSuccess;
16 }
17
18 FsePluginInvoke CallMember(int ClassID , int ExternalMemberID , FsObject* Parameters , int ParamCount , FsObject& ErrorMessage , FsObject& Result)
19 {
20 switch(GetMemberID(ExternalMemberID))
21 {
22 case 0:
23 GetConsole()->Write(L"VczhClass::MethodA is invoking.\r\n");
24 break;
25 case 1:
26 GetConsole()->Write(L"VczhClass::MethodB is invoking.\r\n");
27 break;
28 case 2:
29 GetConsole()->Write(L"VczhClass::MethodC is invoking.\r\n");
30 break;
31 }
32 return fsSuccess;
33 }
34
35 void CallDestructor(int ClassID)
36 {
37 GetConsole()->Write(L"VczhClass is destroying.\r\n");
38 }
39 };
40
41 class VczhConsole : public FsPlugin
42 {
43 protected:
44 FsObject FWrite;
45 FsObject FWriteLine;
46 FsObject FRead;
47 FsObject FCollect;
48 VczhClass* FVczhClass;
49
50 VUnicodeString Transform(const FsObject& Value)
51 {
52 return Value.GetReadableString().w_str();
53 }
54 public:
55 VczhConsole(FsEngine* Engine , VUnicodeString CodePath):FsPlugin(Engine,L"interpreter")
56 {
57 FWrite =Engine->CreateExternalResource();
58 FWriteLine =Engine->CreateExternalResource();
59 FRead =Engine->CreateExternalResource();
60 FCollect =Engine->CreateExternalResource();
61
62 GetEnvironment().SetFixedVariable(L"write",FWrite);
63 GetEnvironment().SetFixedVariable(L"writeln",FWriteLine);
64 GetEnvironment().SetFixedVariable(L"read",FRead);
65 GetEnvironment().SetFixedVariable(L"collect",FCollect);
66 GetEnvironment().SetVariable(L"apppath",Engine->CreateString(CodePath.Buffer()));
67 GetEnvironment().SetFixedVariable(L"vmpath",Engine->CreateString(GetConsole()->GetAppPath().Buffer()));
68
69 #ifdef _DEBUG
70 FVczhClass=new VczhClass(this);
71 GetEnvironment().SetFixedVariable(L"VczhClass",FVczhClass->GetCtor());
72 #else
73 FVczhClass=0;
74 #endif
75 }
76
77 ~VczhConsole()
78 {
79 if(FVczhClass)
80 {
81 delete FVczhClass;
82 }
83 }
84
85 FsePluginInvoke Invoke(int ExternalID , FsObject* Parameters , int ParamCount , FsObject& ErrorMessage , FsObject& Result)
86 {
87 if(ExternalID==FWrite.GetExternalID())
88 {
89 for(VInt i=0;i<ParamCount;i++)
90 {
91 GetConsole()->Write(Transform(Parameters[i]));
92 }
93 return fsSuccess;
94 }
95 else if(ExternalID==FWriteLine.GetExternalID())
96 {
97 for(VInt i=0;i<ParamCount;i++)
98 {
99 GetConsole()->Write(Transform(Parameters[i]));
100 }
101 GetConsole()->Write(L"\r\n");
102 return fsSuccess;
103 }
104 else if(ExternalID==FRead.GetExternalID())
105 {
106 for(VInt i=0;i<ParamCount;i++)
107 {
108 GetConsole()->Write(Transform(Parameters[i]));
109 }
110 VUnicodeString Read;
111 GetConsole()->Read(Read);
112 Result=GetOwnedEngine()->CreateString(Read.Buffer());
113 return fsSuccess;
114 }
115 else if(ExternalID==FCollect.GetExternalID())
116 {
117 int* Buffer=0;
118 int Count=GetOwnedEngine()->CollectGarbage(Buffer);
119 FsReleaseBuffer(Buffer);
120 return fsSuccess;
121 }
122 else
123 {
124 return fsGiveUp;
125 }
126 }
127 };
二、書寫測試用的腳本代碼：
1 func()
2 {
3 a=VczhClass.new();
4 a.MethodA();
5 a.MethodB();
6 a.MethodC();
7 }();
8 collect();
這里構造了一個VczhClass并調用了三個成員函數。結束之后，這種寫法保證a再也不可被訪問到，于是調用collect進行垃圾收集（垃圾收集是自動的，但是要觸發條件很難，所以給了個函數進行強制收集）的時候就可以把a手機掉。
三、運行結果：
1 VczhClass is creating.
2 VczhClass::MethodA is invoking.
3 VczhClass::MethodB is invoking.
4 VczhClass::MethodC is invoking.
5 VczhClass is destroying.
四、如果a的成員被保存起來了怎么辦呢？
1 b=null;
2 func()
3 {
4 a=VczhClass.new();
5 a.MethodA();
6 a.MethodB();
7 a.MethodC();
8 b=a.constructor;
9 }();
10 collect();
五、結果是因為b還能繼續使用，所以a就不會銷毀（垃圾收集器解決了這個問題）：
1 VczhClass is creating.
2 VczhClass::MethodA is invoking.
3 VczhClass::MethodB is invoking.
4 VczhClass::MethodC is invoking.
到了這里，一個直接往腳本中插入類的演示就結束了。接下來就是對這個插件進行測試，并且在相應的.NET接口上添加這樣的支持。
posted on 2008-05-28 22:50
陳梓瀚(vczh) 閱讀(1637)
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