TActionList有个标准动作TDownLoadURL，内部是使用的URLDownloadToFile，它下载文件时会定时产生OnDownloadProgress 事件，这样就可以用进度条显示：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47 |
uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, ExtActns, ActnList, StdCtrls, ComCtrls;type TForm1 = class(TForm) Button1: TButton; ActionList1: TActionList; ProgressBar1: TProgressBar; procedure
Button1Click(Sender: TObject); private { Private declarations } procedure
URL_OnDownloadProgress (Sender: TDownLoadURL; Progress, ProgressMax: Cardinal; StatusCode: TURLDownloadStatus; StatusText: String; var
Cancel: Boolean) ; public { Public declarations } end;var Form1: TForm1;implementation{$R *.dfm}procedure
Tform1.URL_OnDownloadProgress;begin ProgressBar1.Max:= ProgressMax; ProgressBar1.Position:= Progress;end;procedure
TForm1.Button1Click(Sender: TObject);begin with
TDownloadURL.Create(self) do try FileName := ‘logo.jpg‘; OnDownloadProgress := URL_OnDownloadProgress; ExecuteTarget(nil) ; finally Free; end; showMessage(‘OK‘); ProgressBar1.Max := 0;end; |
Delphi用TActionList下载文件,布布扣,bubuko.com
原文：http://www.cnblogs.com/evil39c/p/3773324.html
