gaugep.pas

这是一个正式的项目工程

unit GaugeP;

interface

uses
  Classes, comctrls,Gauges;

type
  TGaugeThread = class(TThread)
  private
    Gauge      : TGauge;   // Reference to ProgressBar
    procedure InitGauge; // Setup ProgressBar
    procedure UpdateGauge; // Update ProgressBar
  protected
    procedure Execute; override; // Main thread execution
  published
    constructor CreateIt(PriorityLevel: cardinal;MHeight:Integer; GaugeBar : TGauge);
    destructor Destroy; override;
  end;
implementation

uses
 windows, SendCommand;

constructor TGaugeThread.CreateIt(PriorityLevel: cardinal; MHeight:Integer; GaugeBar : TGauge);
begin
  inherited Create(true);      // Create thread suspended
  Priority :=tpHigher;        //TThreadPriority(PriorityLevel); // Set Priority Level
  FreeOnTerminate := true;   // Thread Free Itself when terminated
  Gauge := GaugeBar;        // Set reference
  Synchronize(InitGauge); // Setup the ProgressBar
  Suspended := false;         // Continue the thread
end;

destructor TGaugeThread.Destroy;
begin
  PostMessage(frmSendCommand.Handle,wm_ThreadDoneMsg,self.ThreadID,0);
  inherited destroy;
end;


procedure TGaugeThread.Execute; // Main execution for thread
begin
  while not Terminated  do
  begin
    Synchronize(UpdateGauge); // Update ProgressBar, uses sychronize because ProgressBar is in another thread
                             // if Terminated is true, this loop exits prematurely so the thread will terminate
  end;
end;

procedure TGaugeThread.InitGauge(); // setup/initialize the ProgressBar
begin
  Gauge.MinValue := 0;       // minimum value for bar
  Gauge.MaxValue := MHeight; // maximum value for bar
                             // size will be used by each call to StepIt
  Gauge.Progress := 0;       // set position to begining
end;


procedure TGaugeThread.UpdateGauge; // Updates the ProgressBar
begin
  Gauge.Progress:=ThreadHeight;     // step the bar
end;


end.