C#攝像頭實現拍照功能的簡單代碼示例

2009-11-20??來自：網上整理字體大小：【大中小】

·摘要：這里將介紹一個C#攝像頭實現拍照功能的簡單代碼示例，代碼雖然不短，但是基本上實現了相對應的功能，希望對大家有所幫助。

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????C#攝像頭實現拍照功能的簡單代碼示例

1.using?System;??

2.using?System.Runtime.InteropServices;??

3.using?System.Drawing;??

4.using?System.Drawing.Imaging;??

5.namespace?Video??

6.{??

7.///??

8.///?一個C#攝像頭控制類?

9.///??

10.publicclass?VideoWork??

11.{??

12.privateconstint?WM_USER?=?0x400;??

13.privateconstint?WS_CHILD?=?0x40000000;??

14.privateconstint?WS_VISIBLE?=?0x10000000;??

15.privateconstint?WM_CAP_START?=?WM_USER;??

16.privateconstint?WM_CAP_STOP?=?WM_CAP_START?+?68;??

17.privateconstint?WM_CAP_DRIVER_CONNECT?=?WM_CAP_START?+?10;??

18.privateconstint?WM_CAP_DRIVER_DISCONNECT?=?WM_CAP_START?+?11;??

19.privateconstint?WM_CAP_SAVEDIB?=?WM_CAP_START?+?25;??

20.privateconstint?WM_CAP_GRAB_FRAME?=?WM_CAP_START?+?60;??

21.privateconstint?WM_CAP_SEQUENCE?=?WM_CAP_START?+?62;??

22.privateconstint?WM_CAP_FILE_SET_CAPTURE_FILEA?=?WM_CAP_START?+?20;??

23.privateconstint?WM_CAP_SEQUENCE_NOFILE?=WM_CAP_START+?63;??

24.privateconstint?WM_CAP_SET_OVERLAY?=WM_CAP_START+?51;???

25.privateconstint?WM_CAP_SET_PREVIEW?=WM_CAP_START+?50;???

26.privateconstint?WM_CAP_SET_CALLBACK_VIDEOSTREAM?=?WM_CAP_START?+6;??

27.privateconstint?WM_CAP_SET_CALLBACK_ERROR=WM_CAP_START?+2;??

28.privateconstint?WM_CAP_SET_CALLBACK_STATUSA=?WM_CAP_START?+3;??

29.privateconstint?WM_CAP_SET_CALLBACK_FRAME=?WM_CAP_START?+5;??

30.privateconstint?WM_CAP_SET_SCALE=WM_CAP_START+?53;??

31.privateconstint?WM_CAP_SET_PREVIEWRATE=WM_CAP_START+?52;???

32.private?IntPtr?hWndC;??

33.privatebool?bWorkStart?=?false;??

34.private?IntPtr?mControlPtr;??

35.privateint?mWidth;??

36.privateint?mHeight;??

37.privateint?mLeft;??

38.privateint?mTop;??

39.

40.///??

41.///?初始化顯示圖像?

42.///??

43.///?控件的句柄?

44.///?開始顯示的左邊距?

45.///?開始顯示的上邊距?

46.///?要顯示的寬度?

47.///?要顯示的長度?

48.public?VideoWork(IntPtr?handle,?int?left,?int?top,?int?width,int?height)??

49.{??

50.mControlPtr?=?handle;??

51.mWidth?=?width;??

52.mHeight?=?height;??

53.mLeft?=?left;??

54.mTop?=?top;??

55.}??

56.[DllImport("avicap32.dll")]???

57.privatestaticextern?IntPtr?capCreateCaptureWindowA(byte[]?lpszWindowName,?int?dwStyle,?int?x,?int?y,?int?nWidth,?int?nHeight,?IntPtr?hWndParent,?int?nID);??

58.[DllImport("avicap32.dll")]??

59.privatestaticexternint?capGetVideoFormat(IntPtr?hWnd,?IntPtr?psVideoFormat,?int?wSize?);??

60.[DllImport("User32.dll")]???

61.privatestaticexternbool?SendMessage(IntPtr?hWnd,?int?wMsg,?int?wParam,?long?lParam);??

62.///??

63.///?開始顯示圖像?

64.///??

65.publicvoid?Start()??

66.{??

67.if?(bWorkStart)??

68.return;??

69.bWorkStart?=?true;??

70.byte[]?lpszName?=?newbyte[100];??

71.hWndC?=?capCreateCaptureWindowA(lpszName,WS_CHILD|WS_VISIBLE?,mLeft,mTop,mWidth,mHeight,mControlPtr,0);??

72.if?(hWndC.ToInt32()?!=?0)??

73.{??

74.SendMessage(hWndC,?WM_CAP_SET_CALLBACK_VIDEOSTREAM,?0,?0);??

75.SendMessage(hWndC,?WM_CAP_SET_CALLBACK_ERROR,?0,?0);??

76.SendMessage(hWndC,?WM_CAP_SET_CALLBACK_STATUSA,?0,?0);??

77.SendMessage(hWndC,?WM_CAP_DRIVER_CONNECT,?0,?0);??

78.SendMessage(hWndC,?WM_CAP_SET_SCALE,?1,?0);??

79.SendMessage(hWndC,?WM_CAP_SET_PREVIEWRATE,?66,?0);??

80.SendMessage(hWndC,?WM_CAP_SET_OVERLAY,?1,?0);??

81.SendMessage(hWndC,?WM_CAP_SET_PREVIEW,?1,?0);??

82.//Global.log.Write("SendMessage");?

83.}??

84.return;??

85.}??

86.///??

87.///?停止顯示?

88.///??

89.publicvoid?Stop()??

90.{??

91.SendMessage(hWndC,?WM_CAP_DRIVER_DISCONNECT,?0,?0);??

92.bWorkStart?=?false;??

93.}??

94.///??

95.///?抓圖?

96.///??

97.///?要保存bmp文件的路徑?

98.publicvoid?GrabImage(string?path)??

99.{??

100.IntPtr?hBmp?=?Marshal.StringToHGlobalAnsi(path);??

101.SendMessage(hWndC,WM_CAP_SAVEDIB,0,hBmp.ToInt64());??

102.}??

103.}??

104.}??

105.

106.//這是一個控制攝像頭進行拍照的類，我每次使用GrabImage抓圖都是225K的一張照片，我想請問如何才能讓我

107.//抓到的圖片小一些，我想控制在70K左右。不知怎么讓拍照的像素變小？

108.

109.if(this.Request.QueryString["filename"]!=null)??

110.{??

111.//獲取原圖片?

112.string?filename=this.Request.QueryString["filename"];??

113.Bitmap?bmpOld=new?Bitmap(this.Server.MapPath("p_w_picpaths/"?+?filename));??

114.//計算縮小比例?

115.double?d1;??

116.if(bmpOld.Height>bmpOld.Width)??

117.d1=(double)(MaxLength/(double)bmpOld.Width);??

118.else

119.d1=(double)(MaxLength/(double)bmpOld.Height);??

120.//產生縮圖?

121.Bitmap?bmpThumb=new?Bitmap(bmpOld,(int)(bmpOld.Width*d1),(int)(bmpOld.Height*d1));??

122.//清除緩沖?

123.Response.Clear();??

124.//生成圖片?

125.bmpThumb.Save(this.Response.OutputStream,ImageFormat.Jpeg);??

126.Response.End();??

127.//釋放資源?

128.bmpThumb.Dispose();??

129.bmpOld.Dispose();??

130.}?

????C#攝像頭實現拍照功能的簡單代碼示例就介紹到這里。

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轉載于:https://blog.51cto.com/3446502/1228106

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