tstripmonitorthreadunit.pas

DELPHI 下远程控制源码

unit TStripMonitorThreadUnit;

interface

uses
  IdTCPServer,IdGlobal,Classes,windows,Forms,SysUtils,Jpeg,Graphics,Variants,
   Types;

type
  TStripMonitorThread = class(TThread)
  private
    ThePriority    :integer; 
    TheStripHeight :integer; 
    TheImageType   :integer;
    ThePicPixFmt   :integer;
    TheImageQos    :integer;
    TheAThread     :TIdPeerThread;
    
    TheNewScrBmp   :TBitMap;  ////用于捕获当前屏幕的图象
    TheOldScrBmp   :TBitmap;  //缓存上次屏幕的图象，用于比较    
    
    TheVarChildBmp :TBitMap;  //变化的子区域1..n
    TheOldChildBmp :TBitmap;  //上次缓存中的变化的子区域1..n
    TheScrRect     :TRect;    //监视区域在屏幕中的矩形坐标
    isTheFirst     :Boolean;  //是第一次运行吗？不是则进行比较传输
    TheSendStream  :TMemoryStream;  //发送块的数据流
    Thejpg         :TJpegImage;     //jpeg格式压缩引擎
  protected
    procedure GetTargetBmp;
    Function  isSameTheBmp(TheNewBmp,TheOldBmp:TBitmap):Boolean;
    procedure Execute; override;
  public
    constructor Create(AThread:TIdPeerThread;ThisPriority,
                                     ThisStripHeight,ThisImageType,
                                        ThisPicPixFmt,ThisImageQoS:Integer);
    destructor  Destroy; override;
  end;

implementation

constructor TstripMonitorThread.Create(AThread:TIdPeerThread;ThisPriority,
                                     ThisStripHeight,ThisImageType,
                                        ThisPicPixFmt,ThisImageQoS:Integer);
begin
    inherited Create(true);
    FreeOnTerminate:=True;//主动释放，不是自动释放
    ThePriority    :=ThisPriority;   //设置线程的优先级
    TheStripHeight :=ThisStripHeight;//设置传输块的高度   
    TheImageType   :=ThisImageType;  //截屏的图象类型   bmp---jpg
    ThePicPixFmt   :=ThisPicPixFmt;   //转换的像素颜色位 1 2 4 8 16 24 32 
    TheImageQos    :=ThisImageQos;    //如果是jpg 格式，则为压缩比
    TheAThread     :=AThread;        
    //设置线程的优先级
    if ThePriority=1 then Priority:=tpIdle;
    if ThePriority=2 then Priority:=tpLowest;
    if ThePriority=3 then Priority:=tpLower;
    if ThePriority=4 then Priority:=tpNormal;
    if ThePriority=5 then Priority:=tpHigher;
    if ThePriority=6 then Priority:=tpHighest;
    if ThePriority=7 then Priority:=tpTimeCritical;
    Try
      TheOldScrBmp   :=TBitmap.Create;  //上次目标屏幕区域
      TheNewScrBmp   :=TBitMap.Create;  //当前目标屏幕区域
      TheVarChildBmp :=TBitMap.Create;  //变化的子区域1..120
      TheOldChildBmp :=TBitmap.Create;  //上次缓存中的变化的子区域1..120       
      Thejpg         :=TJpegImage.Create;//jpeg格式压缩引擎
      TheSendStream  :=TMemoryStream.Create; // 发送块数据流
    except
      Self.Terminate;
      exit;
    end;
    //屏幕矩形的设置                                                  
    TheScrRect.Left  :=0;                             
    TheScrRect.Right :=Screen.Width;                 
    TheScrRect.Top   :=0;                             
    TheScrRect.Bottom:=Screen.Height;	              
    //这为屏幕区域分块传输大小
    TheNewScrBmp.Width:=Screen.Width;   //用于捕获当前屏幕的图象
    TheNewScrBmp.Height:=Screen.Height;
    TheOldScrBmp.Width:=Screen.Width;   //缓存上次屏幕的图象，用于比较
    TheOldScrBmp.Height:=Screen.Height;
    
    TheVarChildBmp.Width:=80;   //获取局部的图形块用于传输
    TheVarChildBmp.Height:=TheStripHeight;
    TheOldChildBmp.Width:=80;   //获取局部的图形块用于比较
    TheOldChildBmp.Height:=TheStripHeight;

   if ThePicPixFmt=1 then TheNewScrBmp.PixelFormat:=pf1bit; 
   if ThePicPixFmt=2 then TheNewScrBmp.PixelFormat:=pf4bit;
   if ThePicPixFmt=3 then TheNewScrBmp.PixelFormat:=pf8bit;
   if ThePicPixFmt=4 then TheNewScrBmp.PixelFormat:=pf16bit;
   if ThePicPixFmt=5 then TheNewScrBmp.PixelFormat:=pf24bit;
   if ThePicPixFmt=6 then TheNewScrBmp.PixelFormat:=pf32bit;
   if ThePicPixFmt=7 then TheNewScrBmp.PixelFormat:=pf24bit;

   if TheImageType=1 then TheNewScrBmp.PixelFormat:=pf24bit;
   
   TheOldScrBmp.PixelFormat:=TheNewScrBmp.PixelFormat;
   TheVarChildBmp.PixelFormat:=TheNewScrBmp.PixelFormat;
   TheOldChildBmp.PixelFormat:=TheNewScrBmp.PixelFormat;                          
    
   Suspended      :=False;//立即执行

   isTheFirst:=True;//是第一次监视屏幕吗？
end;
procedure TStripMonitorThread.GetTargetBmp;
Var
   dc    : HDC;
   iII   : LongBool;   
begin    
   Dc:=GetDC(GetDesktopWindow);
   if Dc=Null then 
   begin
     TheAThread.Connection.Disconnect;
     self.Terminate;
     exit;
   end;
   Repeat	
	iII:=StretchBlt(TheNewScrBmp.Canvas.Handle, 0,0,TheNewScrBmp.Width,
	         TheNewScrBmp.Height,dc,0,0,
                 Screen.Width,Screen.Height,SRCCOPY);
   until iII=True; 
   ReleaseDC(GetDesktopWindow,Dc);     
end;
Function  TStripMonitorThread.isSameTheBmp(TheNewBmp,TheOldBmp:TBitmap):Boolean;
var
  i,j            : integer;
  OldP24,NewP24  : PInteger;  //24位颜色
  OldP16,NewP16  : PWordArray;
  OldP8,NewP8    : PByteArray;
  varCount       : integer;
begin
  if ThePicPixFmt=1 then//==================1位颜色================1
  begin
    TheNewBmp.PixelFormat:=pf8bit;
    TheOldBmp.PixelFormat:=pf8bit;  
    varCount:=0;
    For i:=0 to TheOldBmp.Height-1 do
    begin      
       OldP8:=TheOldBmp.ScanLine[i];//获取扫描线--old
       NewP8:=TheNewBmp.ScanLine[i];//获取扫描线--New
       For j:=0 to TheOldBmp.Width-1 do
       begin
          if OldP8[j]<>NewP8[j] then
                    VarCount:=VarCount+1;
          if VarCount>5 then 
          begin
            Result:=False;
            TheNewBmp.PixelFormat:=TheNewScrBmp.PixelFormat;
            TheNewBmp.PixelFormat:=TheNewBmp.PixelFormat;
            Exit;
          end;         
       end;
     end;
     //====================================恢复原来的像素颜色位格式
     TheNewBmp.PixelFormat:=TheNewScrBmp.PixelFormat;
     TheNewBmp.PixelFormat:=TheNewBmp.PixelFormat;
     Result:=True;
     Application.ProcessMessages;//如果不进行传递则休息一会
  end;
  if ThePicPixFmt=2 then//==================4位颜色================2
  begin
    TheNewBmp.PixelFormat:=pf8bit;
    TheOldBmp.PixelFormat:=pf8bit;  
    varCount:=0;
    For i:=0 to TheOldBmp.Height-1 do
    begin      
       OldP8:=TheOldBmp.ScanLine[i];//获取扫描线--old
       NewP8:=TheNewBmp.ScanLine[i];//获取扫描线--New
       For j:=0 to TheOldBmp.Width-1 do
       begin
          if OldP8[j]<>NewP8[j] then
                    VarCount:=VarCount+1;
          if VarCount>5 then 
          begin
            Result:=False;
            TheNewBmp.PixelFormat:=TheNewScrBmp.PixelFormat;
            TheNewBmp.PixelFormat:=TheNewBmp.PixelFormat;
            Exit;
          end;          
       end;
     end;
     //====================================恢复原来的像素颜色位格式
     TheNewBmp.PixelFormat:=TheNewScrBmp.PixelFormat;
     TheNewBmp.PixelFormat:=TheNewBmp.PixelFormat;
     Result:=True;
     Application.ProcessMessages;//如果不进行传递则休息一会
  end;
  if ThePicPixFmt=3 then//==================8位颜色==================3
  begin
    TheNewBmp.PixelFormat:=pf8bit;
    TheOldBmp.PixelFormat:=pf8bit;  
    varCount:=0;
    For i:=0 to TheOldBmp.Height-1 do
    begin      
       OldP8:=TheOldBmp.ScanLine[i];//获取扫描线--old
       NewP8:=TheNewBmp.ScanLine[i];//获取扫描线--New
       For j:=0 to TheOldBmp.Width-1 do
       begin
          if OldP8[j]<>NewP8[j] then
                    VarCount:=VarCount+1;
          if VarCount>5 then 
          begin
            Result:=False;
            TheNewBmp.PixelFormat:=TheNewScrBmp.PixelFormat;
            TheNewBmp.PixelFormat:=TheNewBmp.PixelFormat;
            Exit;
          end;          
       end;
     end;
     //====================================恢复原来的像素颜色位格式
     TheNewBmp.PixelFormat:=TheNewScrBmp.PixelFormat;
     TheNewBmp.PixelFormat:=TheNewBmp.PixelFormat;
     Result:=True;
     Application.ProcessMessages;//如果不进行传递则休息一会
  end;
  if ThePicPixFmt=4 then//==================16位颜色=================4
  begin
    TheNewBmp.PixelFormat:=pf16bit;
    TheOldBmp.PixelFormat:=pf16bit;  
    varCount:=0;
    For i:=0 to TheOldBmp.Height-1 do
    begin      
       OldP16:=TheOldBmp.ScanLine[i];//获取扫描线--old
       NewP16:=TheNewBmp.ScanLine[i];//获取扫描线--New
       For j:=0 to TheOldBmp.Width-1 do
       begin
          if OldP16[j]<>NewP16[j]then
                    VarCount:=VarCount+1;
          if VarCount>5 then 
          begin
            Result:=False;
            TheNewBmp.PixelFormat:=TheNewScrBmp.PixelFormat;
            TheNewBmp.PixelFormat:=TheNewBmp.PixelFormat;
            Exit;
          end;