大家好,请各位高手提供一点例子,如何通过DELPHI使用摄相头进行拍照,并将获取的图象进行保存为JPEG文件?
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你的电脑有没有摄像头?看到别人用QQ玩视屏你会不会去想怎么实现的?
这里介绍使用DELPHI使用MS的AVICAP32.DLL就可轻松的实现对摄像头编程,
如果再加上你的网络编程水平,实现一个视屏聊天就不成什么问题了。
看看下面代码的代码: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‘;
简介:本文提供一段完整的delphi代码,实现利用摄像头进行拍照的功能。注意需要TVideoCap控件支持。procedure Tfrm1.Button2Click(Sender: TObject);
Var
jpeg: TJPEGImage;
bmp: TBitmap;
MyStm:TMemoryStream;
strfilename,strcard:String;
begin
inherited;
strfilename:=extractfilepath(Application.ExeName);
with DBEdit12.DataSource.DataSet do
begin
if not VideoCap1.SaveAsDIB then
begin
ShowMessage('拍摄照片失败');
Abort;
end;// bmp:= TBitmap.Create;
try
bmp.LoadFromFile(strfilename+ 'Capture.bmp' );
MyStm:=TMemoryStream.Create;
jpeg:= TJPEGImage.Create;
try
jpeg.Assign( bmp );
jpeg.compress;
jpeg.SaveTofile( strfilename+'Capture.jpg');
strfilename:=strfilename+'Capture.jpg';
jpeg.LoadFromFile(strfilename);
jpeg.SaveToStream(MyStm);
MyStm.Position:=0;
OpenQry(query1,'select count(1) as cnt from tb_photo where card_no='''+strcard+'''');//先查找是否有此卡号
OpenQry(pubqry,'select * from tb_photo where card_no='''+strcard+'''');//打开卡号数据表
{OpenQry是自定义打开数据表的函数
OpenQry(qry1:TQuery,ssql:String);
begin
with qry1 do
beign
if active then
close;
sql.clear;
sql.add(ssql);
try
open
catch
on E: Exception do ErrorDialog(E.Message, E.HelpContext);
end;//try
end;
end;
}
with query1 do
begin
if pubqry.Fields[0].AsInteger >0 then //先判断此卡号的图片是否存在,若存在,替换;否则,插入。
Edit
else
Insert; FieldByName('card_no').AsString :=strcard;
TBlobField(FieldByName('photo')).LoadFromStream(MyStm);
Post; //统一提交
end;//with
finally
MyStm.Free;
jpeg.free;
end; //try
finally
bmp.free;
end;//try
end;//with
end;
//请首先下载TVideoCap控件
这里介绍使用DELPHI使用MS的AVICAP32.DLL就可轻松的实现对摄像头编程,
如果再加上你的网络编程水平,实现一个视屏聊天就不成什么问题了。
看看下面代码的代码: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‘;上面的代码就是我们主要用到的一个函数和常量的定义。好了,打开你的Delphi,新建一个工程,将上面的定义加上吧。新建一个窗口,放个Panel上去,添加一个按钮,Caption设置为"开始"
这里需要定义一个全局变量,var hWndC : THandle;开始按钮代码如下:begin
hWndC := capCreateCaptureWindowA(‘My Own Capture Window‘,WS_CHILD or WS_VISIBLE ,Panel1.Left,Panel1.Top,Panel1.Width,Panel1.Height,Form1.Handle,0);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
begin
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_SET_OVERLAY, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
end;
按F9运行一下,怎么样,是不是可以看到摄像头的视屏了?那怎么停下来?再加个按钮caption设置成"停止"
代码如下:
if hWndC <> 0 then begin
SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
hWndC := 0;
end;视屏截到了,怎么把它给保存下来呢?下面按两种方式保存,一个是BMP静态图,一个是AVI动画。再放三个按钮到窗体上去,caption分别设置成"保存BMP"、"开始录像"、"停止录像"
三个按钮的代码分别如下://保存BMP
if hWndC <> 0 then begin
SendMessage(hWndC,WM_CAP_SAVEDIB,0,longint(pchar(‘c:\\test.bmp‘)));
end;//开始录像
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;//停止录像
if hWndC <> 0 then begin
SendMessage(hWndC, WM_CAP_STOP, 0, 0);
end;再运行看看吧。。可以保存几张图看看,也可以录成AVI以后慢慢欣赏。程序运行效果: [ 相关贴图 ]
http://yousoft.hi.com.cn/upload/forum/2004715161959.jpg完整的程序代码如下:unit Unit1;interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls;type
TForm1 = class(TForm)
Panel1: TPanel;
Button1: TButton;
Button2: TButton;
Button3: TButton;
Button4: TButton;
Button5: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure Button4Click(Sender: TObject);
procedure Button5Click(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
private
hWndC : THandle;
public
{ Public declarations }
end;var
Form1: TForm1;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‘;implementation{$R *.dfm}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);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
begin
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_SET_OVERLAY, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
end;end;procedure TForm1.Button2Click(Sender: TObject);
begin
if hWndC <> 0 then begin
SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
hWndC := 0;
end;
end;procedure TForm1.Button3Click(Sender: TObject);
begin
if hWndC <> 0 then begin
SendMessage(hWndC,WM_CAP_SAVEDIB,0,longint(pchar(‘c:\\test.bmp‘)));
end;
end;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;procedure TForm1.Button5Click(Sender: TObject);
begin
if hWndC <> 0 then begin
SendMessage(hWndC, WM_CAP_STOP, 0, 0);
end;
end;procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
if hWndC <> 0 then begin
SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
end;
end;end.如果电脑没有摄像头,但又想看看程序的效果,可以么?
呵呵,当然可以,找个虚拟摄像头不就搞定,大家可以试试SoftCam这个软件,它是一个名副其实的软件摄像机,
能模拟成为“真实的”摄像机,提醒一下各位,大家可不要用这个东东用在QQ,MSN等聊天软件上欺骗MM或GG啊。关于摄像头编程,大家也可以看看这组VCL组件:DSPack,DSPack是一套使用微软Direct Show和DirectX技术的类和组件,设计工作于DirectX 9,支持系统Win9X, ME, 2000和Windows XP。
好了,就介绍这些了,至于视屏聊天怎么实现,就看你的了,无非是按数据压缩传输给对方,显示出来,不过话又说回来,看似简单,实现起来还有些难度的。
如果用AVICAP,请找程序员大本营上面有全的代码