Delphi线程简单创建、挂起、激活与终止

unit Unit1;

unit Unit1;
interface

因为在做PingSwitch项目时发现在Ping交换机做循环的时候界面会死掉~老师说那要使用线程来做就不会~

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls,
Forms,
Dialogs, StdCtrls, Buttons;

因为不用涉及线程间的数据同步~所以就最简单实用的就足够了·····找了好多教程,都是很复杂的···看到个简单的,大家分享一下。

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls,
Forms,
Dialogs, StdCtrls;

type
TForm1 = class(TForm)
UsedThread: TBitBtn;
NoUsedThread: TBitBtn;
procedure UsedThreadClick(Sender: TObject);
procedure NoUsedThreadClick(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls,
Forms,
Dialogs, StdCtrls;

type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Button3: TButton;
Button4: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure Button4Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
hThread:Thandle;//定义一个句柄
ThreadID:DWord;
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.Button1Click(Sender: TObject);
begin
//创建线程,同时线程函数被调用
hthread:=CreateThread(nil,0,@MyThreadfunc,nil,0,ThreadID);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
SuspendThread(hThread); //挂起线程
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
ResumeThread(hThread); // 激活线程
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
TerminateThread(hThread,0); // 终止线程
end;

end.

type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Button3: TButton;
Button4: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure Button4Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
hThread:Thandle;//定义一个句柄
ThreadID:DWord;
end;

var
Form1: TForm1;

var
Form1: TForm1;

implementation

implementation

{$R *.dfm}

{$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;

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.Button1Click(Sender: TObject);
begin
//创建线程,同时线程函数被调用
hthread:=CreateThread(nil,0,@MyThreadfunc,nil,0,ThreadID);
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.Button2Click(Sender: TObject);
begin
SuspendThread(hThread); //挂起线程
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;

procedure TForm1.Button3Click(Sender: TObject);
begin
ResumeThread(hThread); // 激活线程
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
TerminateThread(hThread,0); // 终止线程
end;

end.

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