procedure SaveScrToStream(); //屏幕截取函数
var winHWND :integer;
winDC:integer;
rect:TRect;
fBitmap:TBitmap;
begin
winHWND := GetDesktopWindow();
winDC := GetDC(winHWND);
fBitmap := TBitmap.create;
fBitmap.width := screen.Width;
fBitmap.height := screen.Height; BitBlt(fBitmap.canvas.handle, 0, 0, fBitmap.width, fBitmap.height, winDC, 0, 0, SRCCOPY);
fBitmap.SaveToFile('c:\aa.bmp');
fBitmap.PixelFormat :=pf8bit;
fBitmap.Free;
end;//连接要做的事
procedure TForm1.CS_Connect(Sender: TObject; Socket: TCustomWinSocket);
beginm.Position := 0;socket.SendStream(m);cs.OnDisconnect:=CS_DisConnect;
end;
//关闭
procedure TForm1.CS_DisConnect(Sender: TObject; Socket: TCustomWinSocket);
begin
(Sender as TClientSocket).socket.close;
end;
//点击按钮发送消息
procedure TForm1.Button1Click(Sender: TObject);begin
cs:= TClientSocket.Create(nil);
cs.Host:='192.168.0.21';
cs.Port:= 1234;
SaveScrToStream(); m.Free; m := tfilestream.Create('C:\aa.bmp',fmOpenRead ); cs.OnConnect:= CS_Connect;
cs.Open;
end;第一次在服务器端已经完整传过去了,第二次的时候出现External exception C0000008的错误
var winHWND :integer;
winDC:integer;
rect:TRect;
fBitmap:TBitmap;
begin
winHWND := GetDesktopWindow();
winDC := GetDC(winHWND);
fBitmap := TBitmap.create;
fBitmap.width := screen.Width;
fBitmap.height := screen.Height; BitBlt(fBitmap.canvas.handle, 0, 0, fBitmap.width, fBitmap.height, winDC, 0, 0, SRCCOPY);
fBitmap.SaveToFile('c:\aa.bmp');
fBitmap.PixelFormat :=pf8bit;
fBitmap.Free;
end;//连接要做的事
procedure TForm1.CS_Connect(Sender: TObject; Socket: TCustomWinSocket);
beginm.Position := 0;socket.SendStream(m);cs.OnDisconnect:=CS_DisConnect;
end;
//关闭
procedure TForm1.CS_DisConnect(Sender: TObject; Socket: TCustomWinSocket);
begin
(Sender as TClientSocket).socket.close;
end;
//点击按钮发送消息
procedure TForm1.Button1Click(Sender: TObject);begin
cs:= TClientSocket.Create(nil);
cs.Host:='192.168.0.21';
cs.Port:= 1234;
SaveScrToStream(); m.Free; m := tfilestream.Create('C:\aa.bmp',fmOpenRead ); cs.OnConnect:= CS_Connect;
cs.Open;
end;第一次在服务器端已经完整传过去了,第二次的时候出现External exception C0000008的错误
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, JPEG,ExtCtrls, ScktComp;
type
TForm1 = class(TForm)
ServerSocket1: TServerSocket;
procedure ServerSocket1ClientRead(Sender: TObject;Socket: TCustomWinSocket);
procedure FormCreate(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
private
procedure Cjt_GetScreen(var Mybmp: TBitmap; DrawCur: Boolean);
{自定义抓屏函数,DrawCur表示抓鼠标图像与否}
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
MyStream: TMemorystream;{内存流对象}
implementation
{$R *.DFM}
procedure TForm1.Cjt_GetScreen(var Mybmp: TBitmap; DrawCur: Boolean);
var
Cursorx, Cursory: integer;
dc: hdc;
Mycan: Tcanvas;
R: TRect;
DrawPos: TPoint;
MyCursor: TIcon;
hld: hwnd;
Threadld: dword;
mp: tpoint;
pIconInfo: TIconInfo;
begin
Mybmp := Tbitmap.Create; {建立BMPMAP }
Mycan := TCanvas.Create; {屏幕截取}
dc := GetWindowDC(0);
try
Mycan.Handle := dc;
R := Rect(0, 0, screen.Width, screen.Height);
Mybmp.Width := R.Right;
Mybmp.Height := R.Bottom;
Mybmp.Canvas.CopyRect(R, Mycan, R);
finally
releaseDC(0, DC);
end;
Mycan.Handle := 0;
Mycan.Free;
if DrawCur then {画上鼠标图象}
begin
GetCursorPos(DrawPos);
MyCursor := TIcon.Create;
getcursorpos(mp);
hld := WindowFromPoint(mp);
Threadld := GetWindowThreadProcessId(hld, nil);
AttachThreadInput(GetCurrentThreadId, Threadld, True);
MyCursor.Handle := Getcursor();
AttachThreadInput(GetCurrentThreadId, threadld, False);
GetIconInfo(Mycursor.Handle, pIconInfo);
cursorx := DrawPos.x - round(pIconInfo.xHotspot);
cursory := DrawPos.y - round(pIconInfo.yHotspot);
Mybmp.Canvas.Draw(cursorx, cursory, MyCursor); {画上鼠标}
DeleteObject(pIconInfo.hbmColor);{GetIconInfo 使用时创建了两个bitmap对象. 需要手工释放这两个对象}
DeleteObject(pIconInfo.hbmMask);{否则,调用他后,他会创建一个bitmap,多次调用会产生多个,直至资源耗尽}
Mycursor.ReleaseHandle; {释放数组内存}
MyCursor.Free; {释放鼠标指针}
end;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
ServerSocket1.Port := 3000; {端口}
ServerSocket1.Open; {Socket开始侦听}
end;
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
if ServerSocket1.Active then ServerSocket1.Close; {关闭Socket}
end;
procedure TForm1.ServerSocket1ClientRead(Sender: TObject;
Socket: TCustomWinSocket);
var
S, S1: string;
MyBmp: TBitmap;
Myjpg: TJpegimage;
begin
S := Socket.ReceiveText;
if S = 'cap' then {客户端发出抓屏幕指令}
begin
try
MyStream := TMemorystream.Create;{建立内存流}
MyBmp := TBitmap.Create;
Myjpg := TJpegimage.Create;
Cjt_GetScreen(MyBmp, True); {True表示抓鼠标图像}
Myjpg.Assign(MyBmp); {将BMP图象转成JPG格式,便于在互联网上传输}
Myjpg.CompressionQuality := 10; {JPG文件压缩百分比设置,数字越大图像越清晰,但数据也越大}
Myjpg.SaveToStream(MyStream); {将JPG图象写入流中}
Myjpg.free;
MyStream.Position := 0;{注意:必须添加此句}
s1 := inttostr(MyStream.size);{流的大小}
Socket.sendtext(s1); {发送流大小}
finally
MyBmp.free;
end;
end;
if s = 'ready' then {客户端已准备好接收图象}
begin
MyStream.Position := 0;
Socket.SendStream(MyStream); {将流发送出去}
end;
end;
end.上面是服务端,下面我们来写客户端程序。新建一个工程,添加Socket控件ClientSocket、图像显示控件Image、一个 Panel 、一个Edit、两个 Button和一个状态栏控件StatusBar1。注意:把Edit1和两个 Button放在Panel1上面。ClientSocket的属性跟ServerSocket差不多,不过多了一个Address属性,表示要连接的服务端IP地址。填上IP地址后点“连接”将与服务端程序建立连接,如果成功就可以进行通讯了。点击“抓屏”将发送字符给服务端。因为程序用到了JPEG图像单元,所以要在Uses中添加Jpeg.
全部代码如下:
unit Unit2{客户端};
interface
uses
Windows,Messages,SysUtils,Classes,Graphics,Controls,Forms,Dialogs,StdCtrls,ScktComp,ExtCtrls,Jpeg, ComCtrls;
type
TForm1 = class(TForm)
ClientSocket1: TClientSocket;
Image1: TImage;
StatusBar1: TStatusBar;
Panel1: TPanel;
Edit1: TEdit;
Button1: TButton;
Button2: TButton;
procedure Button1Click(Sender: TObject);
procedure ClientSocket1Connect(Sender: TObject;
Socket: TCustomWinSocket);
procedure Button2Click(Sender: TObject);
procedure ClientSocket1Error(Sender: TObject; Socket: TCustomWinSocket;
ErrorEvent: TErrorEvent; var ErrorCode: Integer);
procedure ClientSocket1Read(Sender: TObject; Socket: TCustomWinSocket);
procedure FormCreate(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure ClientSocket1Disconnect(Sender: TObject;
Socket: TCustomWinSocket);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
MySize: Longint;
MyStream: TMemorystream;{内存流对象}
implementation
{$R *.DFM}
procedure TForm1.FormCreate(Sender: TObject);
begin
{-------- 下面为设置窗口控件的外观属性 ------------- }
{注意:把Button1、Button2和Edit1放在Panel1上面}
Edit1.Text := '127.0.0.1';
Button1.Caption := '连接主机';
Button2.Caption := '抓屏幕';
Button2.Enabled := false;
Panel1.Align := alTop;
Image1.Align := alClient;
Image1.Stretch := True;
StatusBar1.Align:=alBottom;
StatusBar1.SimplePanel := True;
{----------------------------------------------- }
MyStream := TMemorystream.Create; {建立内存流对象}
MySize := 0; {初始化}
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
if not ClientSocket1.Active then
begin
ClientSocket1.Address := Edit1.Text; {远程IP地址}
ClientSocket1.Port := 3000; {Socket端口}
ClientSocket1.Open; {建立连接}
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
Clientsocket1.Socket.SendText('cap'); {发送指令通知服务端抓取屏幕图象}
Button2.Enabled := False;
end;
procedure TForm1.ClientSocket1Connect(Sender: TObject;
Socket: TCustomWinSocket);
begin
StatusBar1.SimpleText := '与主机' + ClientSocket1.Address + '成功建立连接!';
Button2.Enabled := True;
end;
procedure TForm1.ClientSocket1Error(Sender: TObject;
Socket: TCustomWinSocket; ErrorEvent: TErrorEvent;
var ErrorCode: Integer);
begin
Errorcode := 0; {不弹出出错窗口}
StatusBar1.SimpleText := '无法与主机' + ClientSocket1.Address + '建立连接!';
end;
procedure TForm1.ClientSocket1Disconnect(Sender: TObject;
Socket: TCustomWinSocket);
begin
StatusBar1.SimpleText := '与主机' + ClientSocket1.Address + '断开连接!';
Button2.Enabled := False;
end;
procedure TForm1.ClientSocket1Read(Sender: TObject;
Socket: TCustomWinSocket);
var
MyBuffer: array[0..10000] of byte; {设置接收缓冲区}
MyReceviceLength: integer;
S: string;
MyBmp: TBitmap;
MyJpg: TJpegimage;
begin
StatusBar1.SimpleText := '正在接收数据......';
if MySize = 0 then {MySize为服务端发送的字节数,如果为0表示为尚未开始图象接收}
begin
S := Socket.ReceiveText;
MySize := Strtoint(S); {设置需接收的字节数}
Clientsocket1.Socket.SendText('ready'); {发指令通知服务端开始发送图象}
end
else
begin {以下为图象数据接收部分}
MyReceviceLength := socket.ReceiveLength; {读出包长度}
StatusBar1.SimpleText := '正在接收数据,数据大小为:' + inttostr(MySize);
Socket.ReceiveBuf(MyBuffer, MyReceviceLength); {接收数据包并读入缓冲区内}
MyStream.Write(MyBuffer, MyReceviceLength); {将数据写入流中}
if MyStream.Size >= MySize then {如果流长度大于需接收的字节数,则接收完毕}
begin
MyStream.Position := 0;
MyBmp := tbitmap.Create;
MyJpg := tjpegimage.Create;
try
MyJpg.LoadFromStream(MyStream); {将流中的数据读至JPG图像对象中}
MyBmp.Assign(MyJpg); {将JPG转为BMP}
StatusBar1.SimpleText := '正在显示图像';
Image1.Picture.Bitmap.Assign(MyBmp); {分配给image1元件 }
finally {以下为清除工作 }
MyBmp.free;
MyJpg.free;
Button2.Enabled := true;
{ Socket.SendText('cap');添加此句即可连续抓屏 }
MyStream.Clear;
MySize := 0;
end;
end;
end;
end;
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
MyStream.Free; {释放内存流对象}
if ClientSocket1.Active then ClientSocket1.Close; {关闭Socket连接}
end;
end.
以上代码在D7中亲测通过,非常方便,一个字,爽------------------
你这种代码也就只能在局域网中用。CPU占用还要100%,才能得到每秒5帧的更新速率现在我做了一个 15fps 的,CPU只占40%
VC++.delphi
VB C# .NET远程屏幕监视
局域网屏幕监视
局域网桌面监视
屏幕监控
屏幕抓取
屏幕传输
屏幕截图
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