新建一个单元文件,填写如下代码,然后保存为 ClassInfoUnit.pas,这里定义了一个结构,用来读取指定类的信息。
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- unit ClassInfoUnit;
- interface
- uses
- Classes, TypInfo;
- type
- { 存放类属性的动态数组 }
- PropInfoArray = array of PPropInfo;
- { 用法:首先声明该结构的变量,然后通过 Create 函数或 Target 属性指定要获取 }
- { 信息的类,然后就可以通过 public 中的属性或方法来获取该类的各种信息了 }
- TClassInfo = record { use TypInfo }
- private
- { 属性:要获取其运行时信息(RTTI)的类 }
- FTarget: TClass;
- { 属性:指向存放类信息的指针 }
- FTypeInfo: PTypeInfo;
- { 属性:指向存放类数据的指针 }
- FDataInfo: PTypeData;
- { 类属性(property)的个数 }
- FPropertyCount: Cardinal;
- { 类属性列表(数组) }
- FPropertyList: PropInfoArray;
- { 设置 FTarget }
- procedure SetTarget(aClass: TClass);
- { 读取 PropertyTypes[Index] }
- function GetPropTypes(Index: Integer): PTypeInfo;
- public
- { 构造函数,用来设置要获取其信息的对象 }
- procedure Create(aObj: TObject); overload;
- { 构造函数,用来设置要获取其信息的类 }
- procedure Create(aClass: TClass); overload;
- { 获取类的所有属性和事件 }
- function GetAllProperties: string;
- { 获取类的所有属性 }
- function GetPropList: string;
- { 获取类的所有事件 }
- function GetMethodList: string;
- { 指向类信息的指针 }
- property TypeInfo: PTypeInfo read FTypeInfo;
- { 指向类数据的指针 }
- property DataInfo: PTypeData read FDataInfo;
- { 属性:要获取其运行时信息(RTTI)的类 }
- property Target: TClass read FTarget write SetTarget;
- { 类的所有属性信息列表 }
- property PropertyList: PropInfoArray read FPropertyList;
- { 类的所有属性类型列表 }
- property PropertyTypes[Index: Integer]: PTypeInfo read GetPropTypes;
- { 类的属性总个数 }
- property PropertyCount: Cardinal read FPropertyCount;
- end;
- implementation
- { 构造函数 }
- procedure TClassInfo.Create(aObj: TObject);
- begin
- if aObj = nil then
- Create(nil)
- else
- Create(aObj.ClassType);
- end;
- { 构造函数 }
- procedure TClassInfo.Create(aClass: TClass);
- begin
- Target := aClass;
- end;
- { 私有:更改要操作的类 }
- procedure TClassInfo.SetTarget(aClass: TClass);
- begin
- if FTarget = aClass then
- Exit;
- FTarget := aClass;
- if Assigned(FTarget) then
- begin
- FTypeInfo := aClass.ClassInfo;
- FDataInfo := GetTypeData(FTypeInfo);
- FPropertyCount := FDataInfo.PropCount;
- SetLength(FPropertyList, FPropertyCount);
- GetPropInfos(FTypeInfo, PPropList(FPropertyList));
- end
- else
- begin
- FTypeInfo := nil;
- FDataInfo := nil;
- FPropertyCount := 0;
- SetLength(FPropertyList,0);
- end;
- end;
- { 私有:获取属性的类型信息 }
- function TClassInfo.GetPropTypes(Index: Integer): PTypeInfo;
- begin
- Result := nil;
- if FPropertyCount = 0 then
- Exit;
- Result := FPropertyList[Index].PropType^;
- end;
- { 获取所有属性和事件列表 }
- function TClassInfo.GetAllProperties: string;
- var
- I: Integer;
- Strs: TStringList;
- begin
- if FPropertyCount = 0 then
- Exit;
- Strs := TStringList.Create;
- try
- for I := 0 to PropertyCount - 1 do
- Strs.Add(PropertyList[I].Name);
- Result := Strs.Text;
- finally
- Strs.Free;
- end;
- end;
- { 获取属性列表 }
- function TClassInfo.GetPropList: string;
- var
- I: Integer;
- Strs: TStringList;
- begin
- if FPropertyCount = 0 then
- Exit;
- Strs := TStringList.Create;
- try
- for I := 0 to PropertyCount - 1 do
- begin
- if PropertyTypes[I].Kind <> tkMethod then
- Strs.Add(PropertyList[I].Name);
- end;
- Result := Strs.Text;
- finally
- Strs.Free;
- end;
- end;
- { 获取事件列表 }
- function TClassInfo.GetMethodList: string;
- var
- I: Integer;
- Strs: TStringList;
- begin
- if FPropertyCount = 0 then
- Exit;
- Strs := TStringList.Create;
- try
- for I := 0 to PropertyCount - 1 do
- begin
- if PropertyTypes[I].Kind = tkMethod then
- Strs.Add(PropertyList[I].Name)
- end;
- Result := Strs.Text;
- finally
- Strs.Free;
- end;
- end;
- end.
然后创建一个空白窗体,窗体上创建两个 TMemo(mmo1、mmo2)和两个 TButton(btn1、btn2),双击 btn1 和 btn2 ,使用如下代码进行测试(测试在程序运行时 TControl 和 TButton 的 published 属性和方法):
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- unit Form1Unit;
- interface
- uses
- Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
- Dialogs, StdCtrls, ExtCtrls;
- type
- TForm1 = class(TForm)
- mmo1: TMemo;
- mmo2: TMemo;
- btn1: TButton;
- btn2: TButton;
- procedure btn1Click(Sender: TObject);
- procedure btn2Click(Sender: TObject);
- private
- { Private declarations }
- public
- { Public declarations }
- end;
- var
- Form1: TForm1;
- implementation
- {$R *.dfm}
- uses
- ClassInfoUnit;
- { 获取 TControl 的运行时信息 }
- procedure TForm1.btn1Click(Sender: TObject);
- var
- CI: TClassInfo;
- begin
- Caption := ‘TControl‘;
- CI.Create(TControl);
- mmo1.Text := CI.GetPropList;
- mmo2.Text := CI.GetMethodList;
- end;
- { 获取 TButton 的运行时信息 }
- procedure TForm1.btn2Click(Sender: TObject);
- var
- CI: TClassInfo;
- begin
- Caption := ‘TButton‘;
- CI.Create(TButton);
- mmo1.Text := CI.GetPropList;
- mmo2.Text := CI.GetMethodList;
- end;
- end.
http://blog.csdn.net/stevenldj/article/details/7166455
时间: 2024-12-09 13:34:05