C#摄像头实现拍照功能的简单代码示例
View Code
1 using System.Drawing;
2 using System.Drawing.Imaging;
3 using System;
4 using System.Runtime.InteropServices;
View Code
1 private const int WM_USER = 0x400;
2 private const int WS_CHILD = 0x40000000;
3 private const int WS_VISIBLE = 0x10000000;
4 private const int WM_CAP_START = WM_USER;
5 private const int WM_CAP_STOP = WM_CAP_START + 68;
6 private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;
7 private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;
8 private const int WM_CAP_SAVEDIB = WM_CAP_START + 25;
9 private const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60;
10 private const int WM_CAP_SEQUENCE = WM_CAP_START + 62;
11 private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;
12 private const int WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + 63;
13 private const int WM_CAP_SET_OVERLAY = WM_CAP_START + 51;
14 private const int WM_CAP_SET_PREVIEW = WM_CAP_START + 50;
15 private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6;
16 private const int WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2;
17 private const int WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START + 3;
18 private const int WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START + 5;
19 private const int WM_CAP_SET_SCALE = WM_CAP_START + 53;
20 private const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52;
21 private IntPtr hWndC;
22 private bool bStat = false;
23 private IntPtr mControlPtr;
24 private int mWidth;
25 private int mHeight;
26 private int mLeft;
27 private int mTop;
View Code
1 /// <summary>
2 /// 初始化摄像头
3 /// </summary>
4 /// <param name="handle">控件的句柄</param>
5 /// <param name="left">开始显示的左边距</param>
6 /// <param name="top">开始显示的上边距</param>
7 /// <param name="width">要显示的宽度</param>
8 /// <param name="height">要显示的长度</param>
9 public VideoClass(IntPtr handle, int left, int top, int width, int height)
10 {
11 mControlPtr = handle;
12 mWidth = width;
13 mHeight = height;
14 mLeft = left;
15 mTop = top;
16 }
View Code
1 [DllImport("avicap32.dll")]
2 private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
3
4 [DllImport("avicap32.dll")]
5 private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);
6
7 [DllImport("User32.dll")]
8 private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, long lParam);
9
10 [DllImport("avicap32.dll")]
11 public static extern bool capGetDriverDescriptionA(short wDriver, byte[] lpszName, int cbName, byte[] lpszVer, int cbVer);
View Code
1 /// <summary>
2 /// 开始显示图像
3 /// </summary>
4 public void Start()
5 {
6 if (bStat)
7 return;
8 bStat = true;
9 byte[] lpszName = new byte[100];
10
11 hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);
12
13 if (hWndC.ToInt32() != 0)
14 {
15 SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
16 SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
17 SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
18 SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
19 SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);
20 SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);
21 SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);
22 SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
23 }
24 return;
25 }
View Code
1 /// <summary>
2 /// 停止显示
3 /// </summary>
4 public void Stop()
5 {
6 SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
7 bStat = false;
8 }
9 /// <summary>
10 /// 抓图
11 /// </summary>
12 /// <param name="path">要保存bmp文件的路径</param>
13 public void GrabImage(string path)
14 {
15 IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
16 SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt64());
17 }
18 /// <summary>
19 /// 录像
20 /// </summary>
21 /// <param name="path">要保存avi文件的路径</param>
22 public void Kinescope(string path)
23 {
24 IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
25 SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt64());
26 SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
27 }
28 /// <summary>
29 /// 停止录像
30 /// </summary>
31 public void StopKinescope()
32 {
33 SendMessage(hWndC, WM_CAP_STOP, 0, 0);
34 }
