unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, ComCtrls, StdCtrls, IdComponent, IdTCPConnection, IdTCPClient,
IdHTTP, IdBaseComponent, IdAntiFreezeBase, IdAntiFreeze,
IdThreadComponent, IdFTP;
type
TThread1 = class(TThread)
private
fCount, tstart, tlast: integer;
tURL, tFile, temFileName: string;
tResume: Boolean;
tStream: TFileStream;
protected
procedure Execute; override;
public
constructor create1(aURL, aFile, fileName: string; bResume: Boolean; Count,
start, last: integer);
procedure DownLodeFile(); //下載文件
end;
type
TForm1 = class(TForm)
IdAntiFreeze1: TIdAntiFreeze;
IdHTTP1: TIdHTTP;
Button1: TButton;
ProgressBar1: TProgressBar;
IdThreadComponent1: TIdThreadComponent;
Label1: TLabel;
Label2: TLabel;
Button2: TButton;
Button3: TButton;
ListBox1: TListBox;
Edit1: TEdit;
Edit2: TEdit;
Label3: TLabel;
Label4: TLabel;
procedure Button1Click(Sender: TObject);
procedure IdHTTP1WorkBegin(Sender: TObject; AWorkMode: TWorkMode;
const AWorkCountMax: Integer);
procedure IdHTTP1Work(Sender: TObject; AWorkMode: TWorkMode;
const AWorkCount: Integer);
procedure Button2Click(Sender: TObject);
procedure IdHTTP1Status(ASender: TObject; const AStatus: TIdStatus;
const AStatusText: string);
procedure Button3Click(Sender: TObject);
private
public
nn, aFileSize, avg: integer;
MyThread: array[1..10] of TThread;
procedure GetThread();
procedure AddFile();
function GetURLFileName(aURL: string): string;
function GetFileSize(aURL: string): integer;
end;
var
Form1: TForm1;
implementation
var
AbortTransfer: Boolean;
aURL, aFile: string;
tcount: integer; //檢查文件是否全部下載完畢
{$R *.dfm}
//get FileName
function TForm1.GetURLFileName(aURL: string): string;
var
i: integer;
s: string;
begin //返回下載地址的文件名
s := aURL;
i := Pos('/', s);
while i <> 0 do //去掉"/"前面的內容剩下的就是文件名了
begin
Delete(s, 1, i);
i := Pos('/', s);
end;
Result := s;
end;
//get FileSize
function TForm1.GetFileSize(aURL: string): integer;
var
FileSize: integer;
begin
IdHTTP1.Head(aURL);
FileSize := IdHTTP1.Response.ContentLength;
IdHTTP1.Disconnect;
Result := FileSize;
end;
//執行下載
procedure TForm1.Button1Click(Sender: TObject);
var
j: integer;
begin
tcount := 0;
Showmessage('OK!主線程在執行，獲得文件名並顯示在Edit2中');
aURL := Edit1.Text; //下載地址
aFile := GetURLFileName(Edit1.Text); //得到文件名
nn := StrToInt(Edit2.Text); //線程數
j := 1;
aFileSize := GetFileSize(aURL);
avg := trunc(aFileSize / nn);
begin
try
GetThread();
while j <= nn do
begin
MyThread[j].Resume; //喚醒線程
j := j + 1;
end;
except
Showmessage('創建線程失敗!');
Exit;
end;
end;
end;
//開始下載前,將ProgressBar1的最大值設置爲需要接收的數據大小.
procedure TForm1.IdHTTP1WorkBegin(Sender: TObject; AWorkMode: TWorkMode;
const AWorkCountMax: Integer);
begin
AbortTransfer := False;
ProgressBar1.Max := AWorkCountMax;
ProgressBar1.Min := 0;
ProgressBar1.Position := 0;
end;
//接收數據的時候,進度將在ProgressBar1顯示出來.
procedure TForm1.IdHTTP1Work(Sender: TObject; AWorkMode: TWorkMode;
const AWorkCount: Integer);
begin
if AbortTransfer then
begin
IdHTTP1.Disconnect; //中斷下載
end;
ProgressBar1.Position := AWorkCount;
//ProgressBar1.Position:=ProgressBar1.Position+AWorkCount; //*******顯示速度極快
Application.ProcessMessages;
//***********************************這樣使用不知道對不對
end;
//中斷下載
procedure TForm1.Button2Click(Sender: TObject);
begin
AbortTransfer := True;
IdHTTP1.Disconnect;
end;
//狀態顯示
procedure TForm1.IdHTTP1Status(ASender: TObject; const AStatus: TIdStatus;
const AStatusText: string);
begin
ListBox1.ItemIndex := ListBox1.Items.Add(AStatusText);
end;
//退出程序
procedure TForm1.Button3Click(Sender: TObject);
begin
application.Terminate;
end;
//循環產生線程
procedure TForm1.GetThread();
var
i: integer;
start: array[1..100] of integer;
last: array[1..100] of integer; //改用了數組，也可不用
fileName: string;
begin
i := 1;
while i <= nn do
begin
start[i] := avg * (i - 1);
last[i] := avg * i -1; //這裏原先是last:=avg*i;
if i = nn then
begin
last[i] := avg*i + aFileSize-avg*nn; //這裏原先是aFileSize
end;
fileName := aFile + IntToStr(i);
MyThread[i] := TThread1.create1(aURL, aFile, fileName, false, i, start[i],
last[i]);
i := i + 1;
end;
end;
procedure TForm1.AddFile(); //合併文件
var
mStream1, mStream2: TMemoryStream;
i: integer;
begin
i := 1;
mStream1 := TMemoryStream.Create;
mStream2 := TMemoryStream.Create;
mStream1.loadfromfile('設備工程進度管理前期規劃.doc' + '1');
while i < nn do
begin
mStream2.loadfromfile('設備工程進度管理前期規劃.doc' + IntToStr(i + 1));
mStream1.seek(mStream1.size, soFromBeginning);
mStream1.copyfrom(mStream2, mStream2.size);
mStream2.clear;
i := i + 1;
end;
mStream2.free;
mStream1.SaveToFile('設備工程進度管理前期規劃.doc');
mStream1.free;
//刪除臨時文件
i:=1;
while i <= nn do
begin
deletefile('設備工程進度管理前期規劃.doc' + IntToStr(i));
i := i + 1;
end;
Form1.ListBox1.ItemIndex := Form1.ListBox1.Items.Add('下在成功');
end;
//構造函數
constructor TThread1.create1(aURL, aFile, fileName: string; bResume: Boolean;
Count, start, last: integer);
begin
inherited create(true);
FreeOnTerminate := true;
tURL := aURL;
tFile := aFile;
fCount := Count;
tResume := bResume;
tstart := start;
tlast := last;
temFileName := fileName;
end;
//下載文件函數
procedure TThread1.DownLodeFile();
var
temhttp: TIdHTTP;
begin
temhttp := TIdHTTP.Create(nil);
temhttp.onWorkBegin := Form1.IdHTTP1WorkBegin;
temhttp.onwork := Form1.IdHTTP1work;
temhttp.onStatus := Form1.IdHTTP1Status;
Form1.IdAntiFreeze1.OnlyWhenIdle := False; //設置使程序有反應.
if FileExists(temFileName) then //如果文件已經存在
tStream := TFileStream.Create(temFileName, fmOpenWrite)
else
tStream := TFileStream.Create(temFileName, fmCreate);
if tResume then //續傳方式
begin
exit;
end
else //覆蓋或新建方式
begin
temhttp.Request.ContentRangeStart := tstart;
temhttp.Request.ContentRangeEnd := tlast;
end;
try
temhttp.Get(tURL, tStream); //開始下載
Form1.ListBox1.ItemIndex := Form1.ListBox1.Items.Add(temFileName +
'download');
finally
//tStream.Free;
freeandnil(tstream);
temhttp.Disconnect;
end;
end;
procedure TThread1.Execute;
begin
if Form1.Edit1.Text <> '' then
//synchronize(DownLodeFile)
DownLodeFile
else
exit;
inc(tcount);
if tcount = Form1.nn then //當tcount=nn時代表全部下載成功
begin
//Showmessage('全部下載成功!');
Form1.ListBox1.ItemIndex := Form1.ListBox1.Items.Add('正在合併刪除臨時文件');
Form1.AddFile;
end;
end;
end.