参考一下这段远程监控的客户端代码,ScreenCap为屏幕画面的截取functionunit ClnUnit;interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, NMUDP;type
TClient = class(TForm)
CUDP: TNMUDP;
procedure FormCreate(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure CUDPDataReceived(Sender: TComponent; NumberBytes: Integer;
FromIP: string; Port: Integer);
private
{ Private declarations }
procedure ScreenCap(LeftPos, TopPos,
RightPos, BottomPos: integer);
public
{ Public declarations }
end;var
Client: TClient;implementationconst BufSize = 2048; { 发送每一笔数据的缓冲区大小 }
var
BmpStream: TMemoryStream;
LeftSize: Longint; { 发送每一笔数据后剩余的字节数 }{$R *.dfm}procedure TClient.FormCreate(Sender: TObject);
begin
BmpStream := TMemoryStream.Create;
end;procedure TClient.FormClose(Sender: TObject; var Action: TCloseAction);
begin
BmpStream.Free;
end;procedure TClient.CUDPDataReceived(Sender: TComponent;
NumberBytes: Integer; FromIP: string; Port: Integer);
var
CtrlCode: array[0..29] of char;
Buf: array[0..BufSize - 1] of char;
TmpStr: string;
SendSize, LeftPos, TopPos, RightPos, BottomPos: integer;
begin
CUDP.ReadBuffer(CtrlCode, NumberBytes); { 读取控制码 }
if CtrlCode[0] + CtrlCode[1] + CtrlCode[2] + CtrlCode[3] = 'show' then
begin { 控制码前4位为“show”表示主控机发出了抓屏指令 }
if BmpStream.Size = 0 then { 没有数据可发,必须截屏生成数据 }
begin
TmpStr := StrPas(CtrlCode);
TmpStr := Copy(TmpStr, 5, Length(TmpStr) - 4);
LeftPos := StrToInt(Copy(TmpStr, 1, Pos(':', TmpStr) - 1));
TmpStr := Copy(TmpStr, Pos(':', TmpStr) + 1, Length(TmpStr)
- Pos(':', TmpStr));
TopPos := StrToInt(Copy(TmpStr, 1, Pos(':', TmpStr) - 1));
TmpStr := Copy(TmpStr, Pos(':', TmpStr) + 1, Length(TmpStr) -
Pos(':', TmpStr));
RightPos := StrToInt(Copy(TmpStr, 1, Pos(':', TmpStr) - 1));
BottomPos := StrToInt(Copy(TmpStr, Pos(':', TmpStr
) + 1, Length(TmpStr) - Pos(':', TmpStr)));
ScreenCap(LeftPos, TopPos, RightPos, BottomPos); {截取屏幕 }
end;
if LeftSize > BufSize then
SendSize := BufSize
else
SendSize := LeftSize;
BmpStream.ReadBuffer(Buf, SendSize);
LeftSize := LeftSize - SendSize;
if LeftSize = 0 then
BmpStream.Clear; { 清空流 }
CUDP.RemoteHost := FromIP; { FromIP为主控机IP地址 }
CUDP.SendBuffer(Buf, SendSize); { 将数据发到主控机的2222口 }
end;
end;procedure TClient.ScreenCap(LeftPos, TopPos,
RightPos, BottomPos: integer);
var
RectWidth, RectHeight: integer;
SourceDC, DestDC, Bhandle: integer;
Bitmap: TBitmap;
begin
RectWidth := RightPos - LeftPos;
RectHeight := BottomPos - TopPos;
SourceDC := CreateDC('DISPLAY', '', '', nil);
DestDC := CreateCompatibleDC(SourceDC);
Bhandle := CreateCompatibleBitmap(SourceDC,
RectWidth, RectHeight);
SelectObject(DestDC, Bhandle);
BitBlt(DestDC, 0, 0, RectWidth, RectHeight, SourceDC,
LeftPos, TopPos, SRCCOPY);
Bitmap := TBitmap.Create;
Bitmap.Handle := BHandle;
BitMap.SaveToStream(BmpStream);
BmpStream.Position := 0;
LeftSize := BmpStream.Size;
Bitmap.Free;
DeleteDC(DestDC);
ReleaseDC(Bhandle, SourceDC);
end;end.
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, NMUDP;type
TClient = class(TForm)
CUDP: TNMUDP;
procedure FormCreate(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure CUDPDataReceived(Sender: TComponent; NumberBytes: Integer;
FromIP: string; Port: Integer);
private
{ Private declarations }
procedure ScreenCap(LeftPos, TopPos,
RightPos, BottomPos: integer);
public
{ Public declarations }
end;var
Client: TClient;implementationconst BufSize = 2048; { 发送每一笔数据的缓冲区大小 }
var
BmpStream: TMemoryStream;
LeftSize: Longint; { 发送每一笔数据后剩余的字节数 }{$R *.dfm}procedure TClient.FormCreate(Sender: TObject);
begin
BmpStream := TMemoryStream.Create;
end;procedure TClient.FormClose(Sender: TObject; var Action: TCloseAction);
begin
BmpStream.Free;
end;procedure TClient.CUDPDataReceived(Sender: TComponent;
NumberBytes: Integer; FromIP: string; Port: Integer);
var
CtrlCode: array[0..29] of char;
Buf: array[0..BufSize - 1] of char;
TmpStr: string;
SendSize, LeftPos, TopPos, RightPos, BottomPos: integer;
begin
CUDP.ReadBuffer(CtrlCode, NumberBytes); { 读取控制码 }
if CtrlCode[0] + CtrlCode[1] + CtrlCode[2] + CtrlCode[3] = 'show' then
begin { 控制码前4位为“show”表示主控机发出了抓屏指令 }
if BmpStream.Size = 0 then { 没有数据可发,必须截屏生成数据 }
begin
TmpStr := StrPas(CtrlCode);
TmpStr := Copy(TmpStr, 5, Length(TmpStr) - 4);
LeftPos := StrToInt(Copy(TmpStr, 1, Pos(':', TmpStr) - 1));
TmpStr := Copy(TmpStr, Pos(':', TmpStr) + 1, Length(TmpStr)
- Pos(':', TmpStr));
TopPos := StrToInt(Copy(TmpStr, 1, Pos(':', TmpStr) - 1));
TmpStr := Copy(TmpStr, Pos(':', TmpStr) + 1, Length(TmpStr) -
Pos(':', TmpStr));
RightPos := StrToInt(Copy(TmpStr, 1, Pos(':', TmpStr) - 1));
BottomPos := StrToInt(Copy(TmpStr, Pos(':', TmpStr
) + 1, Length(TmpStr) - Pos(':', TmpStr)));
ScreenCap(LeftPos, TopPos, RightPos, BottomPos); {截取屏幕 }
end;
if LeftSize > BufSize then
SendSize := BufSize
else
SendSize := LeftSize;
BmpStream.ReadBuffer(Buf, SendSize);
LeftSize := LeftSize - SendSize;
if LeftSize = 0 then
BmpStream.Clear; { 清空流 }
CUDP.RemoteHost := FromIP; { FromIP为主控机IP地址 }
CUDP.SendBuffer(Buf, SendSize); { 将数据发到主控机的2222口 }
end;
end;procedure TClient.ScreenCap(LeftPos, TopPos,
RightPos, BottomPos: integer);
var
RectWidth, RectHeight: integer;
SourceDC, DestDC, Bhandle: integer;
Bitmap: TBitmap;
begin
RectWidth := RightPos - LeftPos;
RectHeight := BottomPos - TopPos;
SourceDC := CreateDC('DISPLAY', '', '', nil);
DestDC := CreateCompatibleDC(SourceDC);
Bhandle := CreateCompatibleBitmap(SourceDC,
RectWidth, RectHeight);
SelectObject(DestDC, Bhandle);
BitBlt(DestDC, 0, 0, RectWidth, RectHeight, SourceDC,
LeftPos, TopPos, SRCCOPY);
Bitmap := TBitmap.Create;
Bitmap.Handle := BHandle;
BitMap.SaveToStream(BmpStream);
BmpStream.Position := 0;
LeftSize := BmpStream.Size;
Bitmap.Free;
DeleteDC(DestDC);
ReleaseDC(Bhandle, SourceDC);
end;end.
var
DC : HDC;
ABitmap:TBitmap;
begin
DC := GetDC (GetDesktopWindow);
ABitmap:=TBitmap.Create;
try
ABitmap.Width := GetDeviceCaps (DC, HORZRES);
ABitmap.Height := GetDeviceCaps (DC, VERTRES);
BitBlt(ABitmap.Canvas.Handle, 0, 0, ABitmap.Width,
ABitmap.Height,DC, 0, 0, SRCCOPY);
finally
ReleaseDC (GetDesktopWindow, DC);
end;
Result:=ABitmap;
end;
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls, NMUDP;type
TServer = class(TForm)
SUDP: TNMUDP;
Panel1: TPanel;
Image1: TImage;
Panel2: TPanel;
Label1: TLabel;
Label2: TLabel;
Button1: TButton;
Edit1: TEdit;
Edit2: TEdit;
Button2: TButton;
Button3: TButton;
Timer1: TTimer;
procedure FormCreate(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure Button1Click(Sender: TObject);
procedure SUDPDataReceived(Sender: TComponent; NumberBytes: Integer;
FromIP: string; Port: Integer);
procedure Timer1Timer(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Server: TServer;implementationconst BufSize = 2048;var
RsltStream, TmpStream: TMemoryStream;{$R *.dfm}procedure TServer.FormCreate(Sender: TObject);
begin
RsltStream := TMemoryStream.Create;
TmpStream := TMemoryStream.Create;
end;procedure TServer.FormClose(Sender: TObject; var Action: TCloseAction);
begin
RsltStream.Free;
TmpStream.Free;
end;procedure TServer.Button1Click(Sender: TObject);
var
ReqCode: array[0..29] of char; ReqCodeStr: string;
begin
ReqCodeStr := 'show' + Edit1.Text;
StrpCopy(ReqCode, ReqCodeStr);
TmpStream.Clear;
RsltStream.Clear;
SUDP.RemoteHost := Edit2.Text;
SUDP.SendBuffer(ReqCode, 30);
end;procedure TServer.SUDPDataReceived(Sender: TComponent;
NumberBytes: Integer; FromIP: string; Port: Integer);
var
ReqCode: array[0..29] of char; ReqCodeStr: string;
begin
ReqCodeStr := 'show' + Edit1.text;
StrpCopy(ReqCode, ReqCodeStr);
SUDP.ReadStream(TmpStream);
RsltStream.CopyFrom(TmpStream, NumberBytes);
if NumberBytes < BufSize then { 数据已读完 }
begin
RsltStream.Position := 0;
Image1.Picture.Bitmap.LoadFromStream(RsltStream);
TmpStream.Clear;
RsltStream.Clear;
end
else
begin
TmpStream.Clear;
ReqCode := 'show';
SUDP.RemoteHost := Edit2.Text;
SUDP.SendBuffer(ReqCode, 30);
end;
end;procedure TServer.Timer1Timer(Sender: TObject);
begin
Button1.Click;
end;procedure TServer.Button2Click(Sender: TObject);
begin
Timer1.Enabled :=true;
end;procedure TServer.Button3Click(Sender: TObject);
begin
Timer1.Enabled :=false;
end;end.