(七)抓取图标(ICON)的窗体 创建一个新的Form3,保存为Capture3.pas。设置属性BorderIcons的四个属性为false. BorderStyle设为bsNone,FormStyle设为fsStayOnTop. 一个私有变量:fDragging:Boolean; 两个公共变量:fRect:TRect,fBmp:TBitmap;
unit Capture3;
interface
uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs;
type TForm3 = class(TForm) procedure FormCreate(Sender: TObject); procedure FormMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer); procedure FormMouseUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); procedure FormActivate(Sender: TObject); procedure FormDestroy(Sender: TObject); procedure FormPaint(Sender: TObject); private fDragging:Boolean; public fRect:TRect; fBmp:TBitmap; end;
var Form3: TForm3;
implementation
{$R *.dfm}
//创建一个新的自定义光标CURSOR_2,放在Capture3.res资源 //文件中.是32*32的白色矩形边框,用来指示抓图的范围. procedure TForm3.FormCreate(Sender: TObject); var aDC:HDC ; const crBox = -19; begin Screen.Cursors[crBox]:=LoadCursor(hInstance,''''CURSOR_2''''); Cursor := crBox; fBmp := TBitmap.Create ; fBmp.Width := Screen.Width ; fBmp.Height:= Screen.Height; aDC := GetDC(0); BitBlt(fBmp.Canvas.Handle,0,0,Screen.Width,Screen.Height,aDC,0,0,srcCopy); ReleaseDC(0,aDC); SetBounds(0,0,Screen.Width,Screen.Height); end;
procedure TForm3.FormMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); begin if mbLeft = Button then begin fDragging := true; SetRect(fRect,X,Y,X+32,Y+32); Canvas.DrawFocusRect(fRect); end; end;
procedure TForm3.FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer); begin if fDragging then begin Canvas.DrawFocusRect(fRect); fRect.Left := X ; fRect.Top := Y ; fRect.Right:= X+32; fRect.Bottom:=Y+32; Canvas.DrawFocusRect(fRect); end; end;
procedure TForm3.FormMouseUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); begin ModalResult:=mrOK; end;
procedure TForm3.FormActivate(Sender: TObject); const crHand=-18; begin Screen.Cursors[crHand]:=LoadCursor(hInstance,pChar(''''CURSOR_1'''')); Cursor:=crHand; end;
procedure TForm3.FormDestroy(Sender: TObject); begin fBmp.Free; Screen.Cursor := crDefault; end;
procedure TForm3.FormPaint(Sender: TObject); begin Canvas.Draw(0,0,fBmp); end;
end.
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