Как работать с web-камерой?

First of all, get the SDK at http://developer.logitech.comhttp://developer.logitech.com

After installation, open delphi and Import ActiveX Control VPortal2 from the list. Now, create a new form, and put a VideoPortal from the ActiveX panel and a button. In the uses, add VideoPortal

On the OnShow add:

VideoPortal1.PrepareControl('QCSDK',
  'HKEY_LOCAL_MACHINE\Software\JCS Programmation\QCSDK', 0);
VideoPortal1.EnableUIElements(UIELEMENT_STATUSBAR, 0, 0);
VideoPortal1.ConnectCamera2;
VideoPortal1.EnablePreview := 1;

On the ButtonClick add:

var
  BMP: TBitmap;
  JPG: TJpegImage;
  L: string;
begin
  F := 'Photos\test.jpg';
  VideoPortal1.StampBackgroundColor := clYellow;
  VideoPortal1.StampTextColor := clBlack;
  VideoPortal1.StampFontName := 'Arial';
  VideoPortal1.StampPointSize := 10;
  VideoPortal1.StampTransparentBackGround := 0;
  L := Format(' %s - %s ', [DateTimeToStr(Now), Num]);
  VideoPortal1.PictureToFile(0, 24, 'Temp.bmp', L);
  BMP := TBitmap.Create;
  JPG := TJpegImage.Create;
  BMP.LoadFromFile('Temp.bmp');
  JPG.CompressionQuality := 85;
  JPG.Assign(BMP);
  JPG.SaveToFile(F);
  BMP.Free;
  JPG.Free;
end;

It's all, run the application, you will see the image from the camera, click on the button to get a picture.

Here is a copy a VideoPortal.Pas (constants).

unit VideoPortal;
 
interface
// Copyright (c) 1996-2000 Logitech, Inc.  All Rights Reserved
// User Interface Element, codes used with EnableUIElement method
const
  UIELEMENT_640x480 = 0;
const
  UIELEMENT_320x240 = 1;
const
  UIELEMENT_PCSMART = 2;
const
  UIELEMENT_STATUSBAR = 3;
const
  UIELEMENT_UI = 4;
const
  UIELEMENT_CAMERA = 5;
const
  UIELEMENT_160x120 = 6;
 
  // Camera status codes, returned by CameraState property
const
  CAMERA_OK = 0;
const
  CAMERA_UNPLUGGED = 1;
const
  CAMERA_INUSE = 2;
const
  CAMERA_ERROR = 3;
const
  CAMERA_SUSPENDED = 4;
const
  CAMERA_DUAL_DETACHED = 5;
const
  CAMERA_UNKNOWNSTATUS = 10;
 
  // Movie Recording Modes, used with MovieRecordMode property
const
  SEQUENCECAPTURE_FPS_USERSPECIFIED = 1;
const
  SEQUENCECAPTURE_FPS_FASTASPOSSIBLE = 2;
const
  STEPCAPTURE_MANUALTRIGGERED = 3;
 
  // Movie Creation Flags, used with MovieCreateFlags property
const
  MOVIECREATEFLAGS_CREATENEW = 1;
const
  MOVIECREATEFLAGS_APPEND = 2;
 
  // Notification Codes
const
  NOTIFICATIONMSG_MOTION = 1;
const
  NOTIFICATIONMSG_MOVIERECORDERROR = 2;
const
  NOTIFICATIONMSG_CAMERADETACHED = 3;
const
  NOTIFICATIONMSG_CAMERAREATTACHED = 4;
const
  NOTIFICATIONMSG_IMAGESIZECHANGE = 5;
const
  NOTIFICATIONMSG_CAMERAPRECHANGE = 6;
const
  NOTIFICATIONMSG_CAMERACHANGEFAILED = 7;
const
  NOTIFICATIONMSG_POSTCAMERACHANGED = 8;
const
  NOTIFICATIONMSG_CAMERBUTTONCLICKED = 9;
const
  NOTIFICATIONMSG_VIDEOHOOK = 10;
const
  NOTIFICATIONMSG_SETTINGDLGCLOSED = 11;
const
  NOTIFICATIONMSG_QUERYPRECAMERAMODIFICATION = 12;
const
  NOTIFICATIONMSG_MOVIESIZE = 13;
 
  // Error codes used by NOTIFICATIONMSG_MOVIERECORDERROR notification:
const
  WRITEFAILURE_RECORDINGSTOPPED = 0;
const
  WRITEFAILURE_RECORDINGSTOPPED_FILECORRUPTANDDELETED = 1;
const
  WRITEFAILURE_CAMERA_UNPLUGGED = 2;
const
  WRITEFAILURE_CAMERA_SUSPENDED = 3;
 
  // Camera type codes, returned by GetCameraType method
const
  CAMERA_UNKNOWN = 0;
const
  CAMERA_QUICKCAM_VC = 1;
const
  CAMERA_QUICKCAM_QUICKCLIP = 2;
const
  CAMERA_QUICKCAM_PRO = 3;
const
  CAMERA_QUICKCAM_HOME = 4;
const
  CAMERA_QUICKCAM_PRO_B = 5;
const
  CAMERA_QUICKCAM_TEKCOM = 6;
const
  CAMERA_QUICKCAM_EXPRESS = 7;
const
  CAMERA_QUICKCAM_FROG = 8; // MIGHT CHANGE NAME BUT ENUM STAYS THE SAME
const
  CAMERA_QUICKCAM_EMERALD = 9; // MIGHT CHANGE NAME BUT ENUM STAYS THE SAME
 
  // Camera-specific property codes used by Set/GetCameraPropertyLong
const
  PROPERTY_ORIENTATION = 0;
const
  PROPERTY_BRIGHTNESSMODE = 1;
const
  PROPERTY_BRIGHTNESS = 2;
const
  PROPERTY_CONTRAST = 3;
const
  PROPERTY_COLORMODE = 4;
const
  PROPERTY_REDGAIN = 5;
const
  PROPERTY_BLUEGAIN = 6;
const
  PROPERTY_SATURATION = 7;
const
  PROPERTY_EXPOSURE = 8;
const
  PROPERTY_RESET = 9;
const
  PROPERTY_COMPRESSION = 10;
const
  PROPERTY_ANTIBLOOM = 11;
const
  PROPERTY_LOWLIGHTFILTER = 12;
const
  PROPERTY_IMAGEFIELD = 13;
const
  PROPERTY_HUE = 14;
const
  PROPERTY_PORT_TYPE = 15;
const
  PROPERTY_PICTSMART_MODE = 16;
const
  PROPERTY_PICTSMART_LIGHT = 17;
const
  PROPERTY_PICTSMART_LENS = 18;
const
  PROPERTY_MOTION_DETECTION_MODE = 19;
const
  PROPERTY_MOTION_SENSITIVITY = 20;
const
  PROPERTY_WHITELEVEL = 21;
const
  PROPERTY_AUTO_WHITELEVEL = 22;
const
  PROPERTY_ANALOGGAIN = 23;
const
  PROPERTY_AUTO_ANALOGGAIN = 24;
const
  PROPERTY_LOWLIGHTBOOST = 25;
const
  PROPERTY_COLORBOOST = 26;
const
  PROPERTY_ANTIFLICKER = 27;
const
  PROPERTY_OPTIMIZATION_SPEED_QUALITY = 28;
const
  PROPERTY_STREAM_HOOK = 29;
const
  PROPERTY_LED = 30;
 
const
  ADJUSTMENT_MANUAL = 0;
const
  ADJUSTMENT_AUTOMATIC = 1;
 
const
  ORIENTATIONMODE_NORMAL = 0;
const
  ORIENTATIONMODE_MIRRORED = 1;
const
  ORIENTATIONMODE_FLIPPED = 2;
const
  ORIENTATIONMODE_FLIPPED_AND_MIRRORED = 3;
 
const
  COMPRESSION_Q0 = 0;
const
  COMPRESSION_Q1 = 1;
const
  COMPRESSION_Q2 = 2;
 
const
  ANTIFLICKER_OFF = 0;
const
  ANTIFLICKER_50Hz = 1;
const
  ANTIFLICKER_60Hz = 2;
 
const
  OPTIMIZE_QUALITY = 0;
const
  OPTIMIZE_SPEED = 1;
 
const
  LED_OFF = 0;
const
  LED_ON = 1;
const
  LED_AUTO = 2;
const
  LED_MAX = 3;
 
const
  PICTSMART_LIGHTCORRECTION_NONE = 0;
const
  PICTSMART_LIGHTCORRECTION_COOLFLORESCENT = 1;
const
  PICTSMART_LIGHTCORRECTION_WARMFLORESCENT = 2;
const
  PICTSMART_LIGHTCORRECTION_OUTSIDE = 3;
const
  PICTSMART_LIGHTCORRECTION_TUNGSTEN = 4;
 
const
  PICTSMART_LENSCORRECTION_NORMAL = 0;
const
  PICTSMART_LENSCORRECTION_WIDEANGLE = 1;
const
  PICTSMART_LENSCORRECTION_TELEPHOTO = 2;
 
const
  CAMERADLG_GENERAL = 0;
const
  CAMERADLG_ADVANCED = 1;
 
implementation
end.
 
Example shows how to use the PictureToMemory method in the QuickCam SDK. 
 
type
  TMemoryStream = class(Classes.TMemoryStream);
 
var
  MS: TMemoryStream;
  lSize: LongInt;
  pBuffer: ^Byte;
 
begin
 
  MS := TMemoryStream.Create;
  bitmap1 := TBitmap.Create;
 
  try
    if VideoPortal1.PictureToMemory(0, 24, 0, lSize, '') = 1 then
    begin
      pBuffer := AllocMem(lSize);
      if VideoPortal1.PictureToMemory(0, 24, integer(pBuffer), lSize, '') = 1 then
      begin
        MS.SetPointer(pBuffer, lSize);
        bitmap1.loadfromstream(MS);
      end;
    end;
  finally
    MS.Free;
    FreeMem(pBuffer);
  end;
end;

Взято с Delphi Knowledge Base: https://www.baltsoft.com/