我尝试了下面的代码,但它无法正常工作...
LoadIconWithScaleDown
返回一个负错误代码。unit Unit1;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.ExtCtrls,
Vcl.StdCtrls;
type
TForm1 = class(TForm)
Image1: TImage;
procedure FormCreate(Sender: TObject);
procedure LoadResToImg(RID: String; const Img: TImage);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
{$R UserResources.res}
uses Winapi.CommCtrl;
procedure TForm1.LoadResToImg(RID: String; const Img: TImage);
var Ico: TIcon;
hI: HICON;
HR: HResult;
begin
Ico:= TIcon.Create;
HR:= LoadIconWithScaleDown(HInstance, PChar(RID), Img.Width, Img.Height, hI);
Ico.Handle:= hI;
Img.Picture.Bitmap.Assign(Ico);
Ico.Free;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
LoadResToImg('OFFLINE', Image1);
end;
end.
UserResources.rc
OFFLINE ICON "gray_button.ico"
ONLINE ICON "green_button.ico"
const
,但是字符串上却没有。应该是相反的! - Andreas RejbrandTImage
这样的对象即使没有const
修饰符,也是通过引用传递的吗? - Marus Gradinaruconst
时,编译器不需要更新引用计数。 - Andreas Rejbrand