delphi多线程程序示例,与.net一样简单

demo:

(*----下面这个程序介绍了我们在使用线程及未使用线程二种情况下,运行该程序的反

应。当点UsedThread按钮时,则建立一个线程,这时我们可以在程序进行计算的同

时,改变窗体的尺寸及移动它。当按下NoUsedThread按钮时,不建立线程,我们会发

现在程序没有计算完之前根本不能做其它任何事情!

unit Unit1;

interface

uses

Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

Dialogs, StdCtrls, Buttons;

type

TForm1 = class(TForm)

UsedThread: TBitBtn;

NoUsedThread: TBitBtn;

procedure UsedThreadClick(Sender: TObject);

procedure NoUsedThreadClick(Sender: TObject);

private

{ Private declarations }

public

{ Public declarations }

end;

var

Form1: TForm1;

implementation

{$R *.dfm}

function MyThreadFunc(P:pointer):Longint;stdcall;

var

i:longint;

DC:HDC;

S:string;

begin

DC:=GetDC(Form1.Handle);

for i:=0 to 500000 do begin

S:=Inttostr(i);

Textout(DC,10,10,Pchar(S),length(S));

end;

ReleaseDC(Form1.Handle,DC);

end;

procedure TForm1.UsedThreadClick(Sender: TObject);

var

hThread:Thandle;//定义一个句柄

ThreadID:DWord;

begin

//创建线程,同时线程函数被调用

hthread:=CreateThread(nil,0,@MyThreadfunc,nil,0,ThreadID);

if hThread=0 then

messagebox(Handle,'Didn’tCreateaThread',nil,MB_OK);

end;

procedure TForm1.NoUsedThreadClick(Sender: TObject);

begin

MyThreadfunc(nil);

//没有创建线程时,直接调用线程函数

end;

end.