unit1.pas

用Delphi开发视频聊天室用Delphi开发视频聊天室

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Panel1: TPanel;
    Button1: TButton;
    Button2: TButton;
    IdUDPClient1: TIdUDPClient;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  CapWnd:THandle;         //定义捕获窗句柄
  CapParms:TcaptureParms; //用于设置设备属性的结构变量
  BMPINFO:TBitmapInfo;    //BMP图像信息
implementation

{$R *.dfm}
function  FrameCallBack(hWnd: HWND; lpVHdr: PVIDEOHDR): LongInt;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.Button1Click(Sender: TObject);
begin
      CapWnd := capCreateCaptureWindow('我的窗口',
            WS_VISIBLE or WS_CHILD,//窗口样式
            0,    //X坐标
            0,    //Y坐标
            panel1.Width,  //窗口宽
            panel1.Height, //窗口高
            panel1.handle, //窗口句柄
            0);    //通常为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); //如果要捕获视频流，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false
      CapPreview(capWnd,true);
end;


procedure TForm1.Button2Click(Sender: TObject);
begin
   capCaptureAbort(CapWnd); //停止捕获
   capDriverDisconnect(CapWnd); //将捕获窗同驱动器断开
end;

end.