动态创造的ComboBox控件，添加OnDrawItem事件是报错

2013-01-11

动态创建的ComboBox控件，添加OnDrawItem事件是报错[BCC32 Error] test.cpp(43): E2034 Cannot convert vo

动态创建的ComboBox控件，添加OnDrawItem事件是报错
[BCC32 Error] test.cpp(43): E2034 Cannot convert 'void (_fastcall * (_closure )(TWinControl *,int,TRect &,TOwnerDrawState))(TWinControl *,int,TRect &,TOwnerDrawState)' to 'TDrawItemEvent'
Full parser context
test.cpp(32): parsing: void _fastcall TForm1::Button1Click(TObject *)

请教一下，我动态的创建了一个ComboBox控件，添加了OnDrawItem事件，结果报错，找不到原因，Help
[解决办法]
TRect 加一个const 就好了

class TForm1 : public TForm
{
__published:// IDE-managed Components
    TComboBox *ComboBox1;
    void __fastcall ComboBox1DrawItem(TWinControl *Control, int Index,
          TRect &Rect, TOwnerDrawState State);
    void __fastcall myComboBox1DrawItem(TWinControl *Control, int Index,
          const TRect &Rect, TOwnerDrawState State);
    void __fastcall FormCreate(TObject *Sender);
private:// User declarations
TComboBox *ComboBox2;
public:// User declarations
    __fastcall TForm1(TComponent* Owner);
};

void __fastcall TForm1::myComboBox1DrawItem(TWinControl *Control, int Index,
const TRect &Rect, TOwnerDrawState State)
{
;
}
[解决办法]
VCL组件的事件处理函数，声明定义最好与事件的处理函数原型保持一致。

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动态创造的ComboBox控件，添加OnDrawItem事件是报错