ucreatesolidbrush.pas

来自「Delphi Win32核心API参考光盘源码 本书包含了常用的Windows」· PAS 代码 · 共 50 行

unit UCreateSolidBrush;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
  NewBrush: HBrush;   // the handle of the brush
  OldBrush: HBrush;   // the handle of the device context's original brush
  FormDC: HDC;        // the handle of the form device context
begin
  {create the brush}
  NewBrush := CreateSolidBrush(clGreen);

  {Get the form's device context}
  FormDC := GetDC(Form1.Handle);

  {Select the brush handle into the form's device context}
  OldBrush := SelectObject(FormDC, NewBrush);

  {fill a rectangle with the brush}
  FillRect(FormDC, Rect(10, 10, 170, 110), NewBrush);

  {clean up the memory}
  SelectObject(FormDC, OldBrush);
  DeleteObject(NewBrush);
end;

end.