Delphi摄像头操作


		/*Title:Delphi摄像头操作
*Author:Insun
*Blog:http://yxmhero1989.blog.163.com
*From:www.4safer.com
*/
*
 
为了笔耕不辍，为了way out，为了Dota激情的时候不内疚，偶尔发发。
各种远控软件都有摄像头操作，其实编程起来没什么技术可言。
DELPHI一般直接使用MS的AVICAP32.DLL就可轻松的实现对摄像头编程，一般不喜欢TVideoCap控件。
首先常量定义和函数定义：
implementation
const WM_CAP_START = WM_USER;
const WM_CAP_STOP = WM_CAP_START + 68;
const WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;
const WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;
const WM_CAP_SAVEDIB = WM_CAP_START + 25;
const WM_CAP_GRAB_FRAME = WM_CAP_START + 60;
const WM_CAP_SEQUENCE = WM_CAP_START + 62;
const WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;
const WM_CAP_SEQUENCE_NOFILE =WM_CAP_START+  63 ;
const WM_CAP_SET_OVERLAY =WM_CAP_START+  51 ;
const WM_CAP_SET_PREVIEW =WM_CAP_START+  50 ;
const WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START +6;
const WM_CAP_SET_CALLBACK_ERROR=WM_CAP_START +2;
const WM_CAP_SET_CALLBACK_STATUSA= WM_CAP_START +3;
const WM_CAP_SET_CALLBACK_FRAME= WM_CAP_START +5;
const WM_CAP_SET_SCALE=WM_CAP_START+  53 ;
const WM_CAP_SET_PREVIEWRATE=WM_CAP_START+  52 ;
function capCreateCaptureWindowA(lpszWindowName : PCHAR;
dwStyle : longint;
x : integer;
y : integer;
nWidth : integer;
nHeight : integer;
ParentWin : HWND;
nId : integer): HWND;
STDCALL EXTERNAL AVICAP32.DLL;
{$R *.dfm}

打开Delphi，添加Panel1到Form1上，定义一个全局变量，var hWndC : THandle;


添加button1 ，caption为激活摄像头：
procedure TForm1.Button1Click(Sender: TObject);
begin
hWndC := capCreateCaptureWindowA(My Own Capture Window,
WS_CHILD or WS_VISIBLE ,
Panel1.Left,
Panel1.Top,
Panel1.Width,
Panel1.Height,
Form1.Handle,
0);
if hWndC <> 0 then
SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);
//SendMessage(hWndC, WM_CAP_SEQUENCE_NOFILE, 1, 0);
SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
end;

 
添加button2 ，caption为关闭摄像头：
procedure TForm1.Button2Click(Sender: TObject);
begin
if hWndC <> 0 then begin
SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
hWndC := 0;
end;
end;

 
添加button3 ，caption为保存为BMP图像：
procedure TForm1.Button3Click(Sender: TObject);
begin
if hWndC <> 0 then begin
SendMessage(hWndC,WM_CAP_SAVEDIB,0,longint(pchar(c:\test.bmp)));
end;
end;
添加button4 ，caption为开始录像：
procedure TForm1.Button4Click(Sender: TObject);
begin
if hWndC <> 0 then
begin
SendMessage(hWndC,WM_CAP_FILE_SET_CAPTURE_FILEA,0, Longint(pchar(c:\test.avi)));
SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
end;
end;

 
添加button5 ，caption为停止录像：
procedure TForm1.Button5Click(Sender: TObject);
begin
if hWndC <> 0 then begin
SendMessage(hWndC, WM_CAP_STOP, 0, 0);
end;
end;
添加button6，caption为退出：
procedure TForm1.Button6Click(Sender: TObject);
begin
close;
end;
 

 
可以添加MediaPlayer和opendialog控件
添加button7，caption为加载视频：
procedure TForm1.Button7Click(Sender: TObject);
begin
openDialog1.DefaultExt := avi;
openDialog1.Filter := avi files (*.avi)|*.avi;
if OpenDialog1.Execute  then
begin
 if (MediaPlayer1.DeviceID<>0) then
  begin
    if (MediaPlayer1.Mode=mpplaying) then MediaPlayer1.Stop;
  end;
 MediaPlayer1.FileName:=openDialog1.FileName;
 //MediaPlayer1.DisplayRect.Top:=panel2.Top;
 //MediaPlayer1.DisplayRect.Left:=panel2.left;
 //MediaPlayer1.DisplayRect.Right:=panel2.Height;
 //MediaPlayer1.DeviceType   :=dtAutoSelect;
 Mediaplayer1.Open;
 MediaPlayer1.Play;
 end;
end;
 
如果电脑没有摄像头，panel就会黑黑的，可以尝试安装SoftCam虚拟摄像头。