Title: A simple way of p2p camera viewing (Via Windows API)
Question: Here is a way to connect to the webcam and share the movie ;).
The capture is firstly saved as a bitmap,then converted to jpeg and last sended to the client.
Answer:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, IdBaseComponent, IdComponent, IdTCPServer, IdTCPConnection,
IdTCPClient, IdMappedPortTCP, IdUDPBase,jpeg, IdUDPServer, IdUDPClient,IdSocketHandle,
IdAntiFreezeBase, IdAntiFreeze,vfw, ExtCtrls, Buttons;
type
TForm1 = class(TForm)
srv: TIdTCPServer;
IdAntiFreeze1: TIdAntiFreeze;
Timer1: TTimer;
SpeedButton1: TSpeedButton;
SpeedButton2: TSpeedButton;
procedure FormShow(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure srvExecute(AThread: TIdPeerThread);
procedure Timer1Timer(Sender: TObject);
procedure SpeedButton1Click(Sender: TObject);
procedure SpeedButton2Click(Sender: TObject);
private
{ Private declarations }
public
h:hwnd;
resim_verisi:array[0..50000] of char;
dosya:file of char;
boyut:longint;
kamera_kapat:boolean;
kamera_kapali:boolean;
kapat:boolean;
bilgi:BITMAPINFO;
procedure boskalinca(Sender: TObject; var Done: Boolean);
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormShow(Sender: TObject);
begin
kapat:=false;
kamera_kapat:=falsE;
if (FileExists('temp.avi')) then
DeleteFile('temp.avi');
{Grnt yakalma penceresini olutur}
h := capCreateCaptureWindow ('Kamera nizleme', WS_CHILD or WS_VISIBLE or WS_THICKFRAME ,
100,100,
160, 120,
Handle, 11011);
{h penceresini (oluturduumuz pencere) kameraya balayan fonksiyon}
capDriverConnect (h, 0); // 0 -means default driver.
{grntnn tutulaca yakalama animasyonu}
capFileSetCaptureFile(h, 'temp.avi') ;
{grntnn ayarlarn renen fonksiyon . Bit ilem resmi formatnda }
capGetVideoFormat(h, @bilgi,sizeof(bilgi));
{bilgi ye gre h penceresinin konumunu ve boyutunu ayarlayan fonksiyon}
SetWindowPos(h,HWND_TOP,0,0,bilgi.bmiHeader.biWidth,bilgi.bmiHeader.biHeight, SWP_SHOWWINDOW );
//capSetCallbackOnFrame(h,resimgonder);
{Tekli grnt yakalamay balatan fonksiyon}
capCaptureSingleFrameOpen(h);
// capSetCallbackOnYield(h,hazir);
assignfile(dosya,'temp.jpg');
{uygulamann bota kalnca altraca fonksiyon}
Application.OnIdle:=boskalinca;
end;
procedure TForm1.boskalinca(Sender: TObject; var Done: Boolean);
begin
end;
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
if(not kamera_kapat) then
capdriverdisconnect(h);
end;
procedure TForm1.srvExecute(AThread: TIdPeerThread);
var i:integer;
begin
i:=(AThread.Connection.ReadInteger(false));
/////////////////////
if i=0 then
begin
AThread.Connection.WriteBuffer(boyut,sizeof(longint),false);
AThread.Connection.WriteBuffer(resim_verisi,boyut,false);
end;
///////////////////
/////////////////////
if i=1 then
begin
kapat:=true;
end;
///////////////////
/////////////////////
if i=2 then
begin
kamera_kapali:=true;
capdriverdisconnect(h);
caption:='Kamera kapal';
end;
///////////////////
/////////////////////
if i=3 then
begin
capdriverconnect(h,0);
kamera_kapali:=false;
caption:='Kamera ak';
end;
///////////////////
end;
procedure TForm1.Timer1Timer(Sender: TObject);
var dib:tpicture;
jpg:tjpegimage;
begin
if not kamera_kapali then
begin
capcapturesingleframe(h);
capcapturesingleframeclose(h);
capfilesavedib(h,'temp.bmp');
capcapturesingleframeopen(h);
dib:=tpicture.Create;
jpg:=tjpegimage.Create;
dib.LoadFromFile('temp.bmp');
jpg.Assign(dib.Bitmap);
jpg.SaveToFile('temp.jpg');
reset(dosya);
Boyut:=FileSize(Dosya);
blockread(dosya,resim_verisi,sizeof(resim_verisi),boyut);
closefile(dosya);
jpg.Free;
dib.Free;
end;
if kapat then close;
end;
procedure TForm1.SpeedButton1Click(Sender: TObject);
begin
capcapturesingleframeclose(h);
capdlgvideoformat(h);
capGetVideoFormat(h, @bilgi,sizeof(bilgi));
{bilgi ye gre h penceresinin konumunu ve boyutunu ayarlayan fonksiyon}
SetWindowPos(h,HWND_TOP,0,0,bilgi.bmiHeader.biWidth,bilgi.bmiHeader.biHeight, SWP_SHOWWINDOW );
capcapturesingleframeopen(h);
end;
procedure TForm1.SpeedButton2Click(Sender: TObject);
begin
capcapturesingleframeclose(h);
capdlgvideosource(h);
capcapturesingleframeopen(h);
end;
end.