unit1.~pas

视屏采集软件

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, IdBaseComponent, IdComponent, IdUDPBase, IdUDPClient,
  StdCtrls, Buttons,jpeg;

type
  TForm1 = class(TForm)
    Panel1: TPanel;
    BitBtn1: TBitBtn;
    BitBtn2: TBitBtn;
    IdUDPClient1: TIdUDPClient;
    procedure BitBtn1Click(Sender: TObject);
    procedure BitBtn2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
uses VFW;
var
CapWnd:THandle; //定义捕捉窗句柄
CapParms:TcaptureParms; //用于设置设备属性的结构变量
BMPINFO:TBitmapInfo; //BMP图像信息
{$R *.dfm}
function FrameCallBack(hWnd: HWND; lpVHdr: PVIDEOHDR): Cardinal;stdcall;
var
hd:Thandle;
jpg:TJpegImage;
memStream :TMemoryStream;
Bitmap:TBitmap;
begin //将数据显在Image，
Bitmap:=TBitmap.Create;
Bitmap.Width :=BMPINFO.bmiHeader.biWidth;
// New size of Bitmap
Bitmap.Height:=BMPINFO.bmiHeader.biHeight;
hd:= DrawDibOpen;
DrawDibDraw(hd,Bitmap.canvas.handle,0,0,BMPINFO.BmiHeader.biwidth,BMPINFO.bmiheader.biheight,@BMPINFO.bmiHeader,lpVHdr^.lpData,0,0,BMPINFO.bmiHeader.biWidth,BMPINFO.bmiHeader.biheight,0);
DrawDibClose(hd);
//发送数据
memStream := TMemoryStream.Create;
jpg := TJpegImage.Create; jpg.Assign(Bitmap);
jpg.CompressionQuality := 10;
//jpg压缩质量
jpg.JPEGNeeded;
jpg.Compress;
jpg.SaveToStream(memStream);
jpg.Free;
//因为UDP数据包有大小限制，这里如果超出部分，就没有传输，完全可以发几次发出去
Form1.IdUDPClient1.BroadcastEnabled:=true;//用广播功能
if memStream.Size>Form1.IdUDPClient1.BufferSize then
  //向192.168.0.X网段广播，端口 9001
  Form1.IdUDPClient1.SendBuffer('192.168.0.255',9001,memStream.Memory^,Form1.IdUDPClient1.BufferSize)
else
  Form1.IdUDPClient1.SendBuffer('192.168.0.255',9001,memStream.Memory^,memStream.Size);
  memStream.Free;
  Bitmap.Free;
end;
procedure TForm1.BitBtn1Click(Sender: TObject);
begin
CapWnd := capCreateCaptureWindow('我的窗口', WS_VISIBLE or WS_CHILD, 0, 0,panel1.Width, panel1.Height,panel1.handle, 0);
if CapWnd = 0 then exit; //定义帧捕捉回调函数
CapSetCallbackOnFrame(CapWnd,FrameCallBack);
CapParms.dwRequestMicroSecPerFrame:=1;
CapParms.fLimitEnabled:=FALSE;
CapParms.fCaptureAudio:=FALSE;
CapParms.fMCIControl:=FALSE;
CapParms.fYield:=TRUE;
CapParms.vKeyAbort:=VK_ESCAPE;
CapParms.fAbortLeftMouse:=False;
CapParms.fAbortRightMouse:=FALSE; //让设置生效
CapCaptureSetSetup(capWnd,@CapParms,sizeof(TCAPTUREPARMS));
CapPreviewRate(capWnd,33); //设置预览视频的频率
CapCaptureSequenceNoFile(capWnd); //如果要捕捉视频流，则要使用函数来指定不生成文件，不然会自动生成AVI文件 CapDriverConnect(CapWnd,0); //连接摄像头设备，第二个参数是个序号，当系统中装有多个显示驱动程序时，其值分别依次为0到总个数如果有多个摄像头，那么就是0->1->2
capGetVideoFormat(capWnd, @BMPINFO,sizeof(TBitmapInfo)); //取得视频图像数据头
CapPreviewScale(capWnd,TRUE); //是否缩放
CapOverlay(capWnd,true); //指定是否使用叠加模式，true为使用，否则为falseCapPreview(capWnd,true);

end;

procedure TForm1.BitBtn2Click(Sender: TObject);
begin
      capCaptureAbort(CapWnd); //停止捕捉
      capCaptureAbort(CapWnd); //停止捕捉 capDriverDisconnect(CapWnd); //将捕捉窗同驱动器断开
end;

end.