Firemonkey和TDownloadUrl [英] Firemonkey and TDownloadUrl
问题描述
我有一个(Delphi XE2)VCL应用程序,其中包含对象TDownloadUrl(VCL.ExtActns)以检查多个网页,因此我想知道FireMonkey中是否存在等效的对象,因为我想利用此新功能的丰富功能平台。
I have an (Delphi XE2) VCL app containing an object TDownloadUrl (VCL.ExtActns) to check several webpages, so I wonder if there is an equivalent object in FireMonkey, 'cause I wanna take advantage of rich features from this new platform.
使用线程的Firemonkey应用程序演示将不胜感激。
A Firemonkey app demo using threads would appreciate. Thanks in advance.
推荐答案
FireMonkey尚不存在操作。
Actions don't exist yet with FireMonkey.
顺便说一句,您可以使用以下代码创建相同的行为:
BTW, you can create the same behavior with a code like this:
IdHTTP1: TIdHTTP;
...
procedure TForm2.MenuItem1Click(Sender: TObject);
const
FILENAME = 'C:\Users\Whiler\Desktop\test.htm';
URL = 'http://stackoverflow.com/questions/7491389/firemonkey-and-tdownloadurl';
var
// sSource: string;
fsSource: TFileStream;
begin
if FileExists(FILENAME) then
begin
fsSource := TFileStream.Create(FILENAME, fmOpenWrite);
end
else
begin
fsSource := TFileStream.Create(FILENAME, fmCreate);
end;
try
IdHTTP1.Get(URL, fsSource);
finally
fsSource.Free;
end;
// sSource := IdHTTP1.Get(URL);
end;
如果只需要内存中的源代码,则注释行可以替换其他行。
The commented lines can replace the others if you just need the source in memory...
如果要使用线程,可以按以下方式进行管理:
If you want to use a thread, you can manage it like this:
unit Unit2;
interface
uses
System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
FMX.Types, FMX.Controls, FMX.Forms, FMX.Dialogs, IdBaseComponent, IdComponent, IdTCPConnection, IdTCPClient, IdHTTP, FMX.Menus;
type
TDownloadThread = class(TThread)
private
idDownloader: TIdHTTP;
FFileName : string;
FURL : string;
protected
procedure Execute; override;
procedure Finished;
public
constructor Create(const sURL: string; const sFileName: string);
destructor Destroy; override;
end;
type
TForm2 = class(TForm)
MenuBar1: TMenuBar;
MenuItem1: TMenuItem;
procedure MenuItem1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form2: TForm2;
implementation
{$R *.fmx}
procedure TForm2.MenuItem1Click(Sender: TObject);
const
FILENAME = 'C:\Users\Whiler\Desktop\test.htm';
URL = 'http://stackoverflow.com/questions/7491389/firemonkey-and-tdownloadurl';
var
// sSource: string;
fsSource: TFileStream;
begin
TDownloadThread.Create(URL, FILENAME).Start;
end;
{ TDownloadThread }
constructor TDownloadThread.Create(const sURL, sFileName: string);
begin
inherited Create(true);
idDownloader := TIdHTTP.Create(nil);
FFileName := sFileName;
FURL := sURL;
FreeOnTerminate := True;
end;
destructor TDownloadThread.Destroy;
begin
idDownloader.Free;
inherited;
end;
procedure TDownloadThread.Execute;
var
// sSource: string;
fsSource: TFileStream;
begin
inherited;
if FileExists(FFileName) then
begin
fsSource := TFileStream.Create(FFileName, fmOpenWrite);
end
else
begin
fsSource := TFileStream.Create(FFileName, fmCreate);
end;
try
idDownloader.Get(FURL, fsSource);
finally
fsSource.Free;
end;
Synchronize(Finished);
end;
procedure TDownloadThread.Finished;
begin
// replace by whatever you need
ShowMessage(FURL + ' has been downloaded!');
end;
end.
这篇关于Firemonkey和TDownloadUrl的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!