前两天从CSDN一个帖子上拷出来的,不记得帖子号了。 ==================================================== unit MainFrm;interfaceuses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls, DBClient, MidasCon, MConnect;type TMainForm = class(TForm) pnlTop: TPanel; pnlLeft: TPanel; lbBaseClassInfo: TListBox; spSplit: TSplitter; lblBaseClassInfo: TLabel; pnlRight: TPanel; lblClassProperties: TLabel; lbPropList: TListBox; lbSampClasses: TListBox; procedure FormCreate(Sender: TObject); procedure lbSampClassesClick(Sender: TObject); private { Private declarations } public { Public declarations } end;var MainForm: TMainForm;implementation uses TypInfo;{$R *.DFM}function CreateAClass(const AClassName: string): TObject; { This method illustrates how you can create a class from the class name. Note that this requires that you register the class using RegisterClasses() as show in the initialization method of this unit. } var C : TFormClass; SomeObject: TObject; begin C := TFormClass(FindClass(AClassName)); SomeObject := C.Create(nil); Result := SomeObject; end; procedure GetBaseClassInfo(AClass: TObject; AStrings: TStrings); { This method obtains some basic RTTI data from the given object and adds that information to the AStrings parameter. } var ClassTypeInfo: PTypeInfo; ClassTypeData: PTypeData; EnumName: String; begin ClassTypeInfo := AClass.ClassInfo; ClassTypeData := GetTypeData(ClassTypeInfo); with AStrings do begin Add(Format('Class Name: %s', [ClassTypeInfo.Name])); EnumName := GetEnumName(TypeInfo(TTypeKind), Integer(ClassTypeInfo.Kind)); Add(Format('Kind: %s', [EnumName])); Add(Format('Size: %d', [AClass.InstanceSize])); Add(Format('Defined in: %s.pas', [ClassTypeData.UnitName])); Add(Format('Num Properties: %d',[ClassTypeData.PropCount])); end; end;procedure GetClassAncestry(AClass: TObject; AStrings: TStrings); { This method retrieves the ancestry of a given object and adds the class names of the ancestry to the AStrings parameter. } var AncestorClass: TClass; begin AncestorClass := AClass.ClassParent; { Iterate through the Parent classes starting with Sender's Parent until the end of the ancestry is reached. } AStrings.Add('Class Ancestry'); while AncestorClass <> nil do begin AStrings.Add(Format(' %s',[AncestorClass.ClassName])); AncestorClass := AncestorClass.ClassParent; end; end; procedure GetClassProperties(AClass: TObject; AStrings: TStrings); { This method retrieves the property names and types for the given object and adds that information to the AStrings parameter. } var PropList: PPropList; ClassTypeInfo: PTypeInfo; ClassTypeData: PTypeData; i: integer; NumProps: Integer; begin ClassTypeInfo := AClass.ClassInfo; ClassTypeData := GetTypeData(ClassTypeInfo); if ClassTypeData.PropCount <> 0 then begin // allocate the memory needed to hold the references to the TPropInfo // structures on the number of properties. GetMem(PropList, SizeOf(PPropInfo) * ClassTypeData.PropCount); try // fill PropList with the pointer references to the TPropInfo structures GetPropInfos(AClass.ClassInfo, PropList); for i := 0 to ClassTypeData.PropCount - 1 do // filter out properties that are events ( method pointer properties) if not (PropList[i]^.PropType^.Kind = tkMethod) then AStrings.Add(Format('%s: %s', [PropList[i]^.Name, PropList[i]^.PropType^.Name])); // Now get properties that are events (method pointer properties) NumProps := GetPropList(AClass.ClassInfo, [tkMethod], PropList); if NumProps <> 0 then begin AStrings.Add(''); AStrings.Add(' EVENTS ================ '); AStrings.Add(''); end; // Fill the AStrings with the events. for i := 0 to NumProps - 1 do AStrings.Add(Format('%s: %s', [PropList[i]^.Name, PropList[i]^.PropType^.Name])); finally FreeMem(PropList, SizeOf(PPropInfo) * ClassTypeData.PropCount); end; end;end;procedure TMainForm.FormCreate(Sender: TObject); begin // Add some example classes to the list box. lbSampClasses.Items.Add('TApplication'); lbSampClasses.Items.Add('TButton'); lbSampClasses.Items.Add('TForm'); lbSampClasses.Items.Add('TListBox'); lbSampClasses.Items.Add('TPaintBox'); lbSampClasses.Items.Add('TMidasConnection'); lbSampClasses.Items.Add('TFindDialog'); lbSampClasses.Items.Add('TOpenDialog'); lbSampClasses.Items.Add('TTimer'); lbSampClasses.Items.Add('TComponent'); lbSampClasses.Items.Add('TGraphicControl'); end;procedure TMainForm.lbSampClassesClick(Sender: TObject); var SomeComp: TObject; begin lbBaseClassInfo.Items.Clear; lbPropList.Items.Clear; // Create an instance of the selected class. SomeComp := CreateAClass(lbSampClasses.Items[lbSampClasses.ItemIndex]); try GetBaseClassInfo(SomeComp, lbBaseClassInfo.Items); GetClassAncestry(SomeComp, lbBaseClassInfo.Items); GetClassProperties(SomeComp, lbPropList.Items); finally SomeComp.Free; end; end;initialization begin RegisterClasses([TApplication, TButton, TForm, TListBox, TPaintBox, TMidasConnection, TFindDialog, TOpenDialog, TTimer, TComponent, TGraphicControl]); end;end.
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unit MainFrm;interfaceuses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, ExtCtrls, DBClient, MidasCon, MConnect;type TMainForm = class(TForm)
pnlTop: TPanel;
pnlLeft: TPanel;
lbBaseClassInfo: TListBox;
spSplit: TSplitter;
lblBaseClassInfo: TLabel;
pnlRight: TPanel;
lblClassProperties: TLabel;
lbPropList: TListBox;
lbSampClasses: TListBox;
procedure FormCreate(Sender: TObject);
procedure lbSampClassesClick(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
MainForm: TMainForm;implementation
uses TypInfo;{$R *.DFM}function CreateAClass(const AClassName: string): TObject;
{ This method illustrates how you can create a class from the class name. Note
that this requires that you register the class using RegisterClasses() as
show in the initialization method of this unit. }
var
C : TFormClass;
SomeObject: TObject;
begin
C := TFormClass(FindClass(AClassName));
SomeObject := C.Create(nil);
Result := SomeObject;
end;
procedure GetBaseClassInfo(AClass: TObject; AStrings: TStrings);
{ This method obtains some basic RTTI data from the given object and adds that
information to the AStrings parameter. }
var
ClassTypeInfo: PTypeInfo;
ClassTypeData: PTypeData;
EnumName: String;
begin
ClassTypeInfo := AClass.ClassInfo;
ClassTypeData := GetTypeData(ClassTypeInfo);
with AStrings do
begin
Add(Format('Class Name: %s', [ClassTypeInfo.Name]));
EnumName := GetEnumName(TypeInfo(TTypeKind), Integer(ClassTypeInfo.Kind));
Add(Format('Kind: %s', [EnumName]));
Add(Format('Size: %d', [AClass.InstanceSize]));
Add(Format('Defined in: %s.pas', [ClassTypeData.UnitName]));
Add(Format('Num Properties: %d',[ClassTypeData.PropCount]));
end;
end;procedure GetClassAncestry(AClass: TObject; AStrings: TStrings);
{ This method retrieves the ancestry of a given object and adds the
class names of the ancestry to the AStrings parameter. }
var
AncestorClass: TClass;
begin
AncestorClass := AClass.ClassParent;
{ Iterate through the Parent classes starting with Sender's
Parent until the end of the ancestry is reached. }
AStrings.Add('Class Ancestry');
while AncestorClass <> nil do
begin
AStrings.Add(Format(' %s',[AncestorClass.ClassName]));
AncestorClass := AncestorClass.ClassParent;
end;
end;
procedure GetClassProperties(AClass: TObject; AStrings: TStrings);
{ This method retrieves the property names and types for the given object
and adds that information to the AStrings parameter. }
var
PropList: PPropList;
ClassTypeInfo: PTypeInfo;
ClassTypeData: PTypeData;
i: integer;
NumProps: Integer;
begin ClassTypeInfo := AClass.ClassInfo;
ClassTypeData := GetTypeData(ClassTypeInfo); if ClassTypeData.PropCount <> 0 then
begin
// allocate the memory needed to hold the references to the TPropInfo
// structures on the number of properties.
GetMem(PropList, SizeOf(PPropInfo) * ClassTypeData.PropCount);
try
// fill PropList with the pointer references to the TPropInfo structures
GetPropInfos(AClass.ClassInfo, PropList);
for i := 0 to ClassTypeData.PropCount - 1 do
// filter out properties that are events ( method pointer properties)
if not (PropList[i]^.PropType^.Kind = tkMethod) then
AStrings.Add(Format('%s: %s', [PropList[i]^.Name, PropList[i]^.PropType^.Name])); // Now get properties that are events (method pointer properties)
NumProps := GetPropList(AClass.ClassInfo, [tkMethod], PropList);
if NumProps <> 0 then begin
AStrings.Add('');
AStrings.Add(' EVENTS ================ ');
AStrings.Add('');
end;
// Fill the AStrings with the events.
for i := 0 to NumProps - 1 do
AStrings.Add(Format('%s: %s', [PropList[i]^.Name, PropList[i]^.PropType^.Name])); finally
FreeMem(PropList, SizeOf(PPropInfo) * ClassTypeData.PropCount);
end;
end;end;procedure TMainForm.FormCreate(Sender: TObject);
begin
// Add some example classes to the list box.
lbSampClasses.Items.Add('TApplication');
lbSampClasses.Items.Add('TButton');
lbSampClasses.Items.Add('TForm');
lbSampClasses.Items.Add('TListBox');
lbSampClasses.Items.Add('TPaintBox');
lbSampClasses.Items.Add('TMidasConnection');
lbSampClasses.Items.Add('TFindDialog');
lbSampClasses.Items.Add('TOpenDialog');
lbSampClasses.Items.Add('TTimer');
lbSampClasses.Items.Add('TComponent');
lbSampClasses.Items.Add('TGraphicControl');
end;procedure TMainForm.lbSampClassesClick(Sender: TObject);
var
SomeComp: TObject;
begin
lbBaseClassInfo.Items.Clear;
lbPropList.Items.Clear; // Create an instance of the selected class.
SomeComp := CreateAClass(lbSampClasses.Items[lbSampClasses.ItemIndex]);
try
GetBaseClassInfo(SomeComp, lbBaseClassInfo.Items);
GetClassAncestry(SomeComp, lbBaseClassInfo.Items);
GetClassProperties(SomeComp, lbPropList.Items);
finally
SomeComp.Free;
end;
end;initialization
begin
RegisterClasses([TApplication, TButton, TForm, TListBox, TPaintBox,
TMidasConnection, TFindDialog, TOpenDialog, TTimer, TComponent,
TGraphicControl]);
end;end.