- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Runtime.InteropServices;
- namespace 操作摄像头
- {
- public class Camera
- {
- private const int WM_USER = 0x400;
- private const int WS_CHILD = 0x40000000;
- private const int WS_VISIBLE = 0x10000000;
- private const int WM_CAP_START = WM_USER;
- private const int WM_CAP_STOP = WM_CAP_START + 68;
- private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;
- private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;
- private const int WM_CAP_SAVEDIB = WM_CAP_START + 25;
- private const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60;
- private const int WM_CAP_SEQUENCE = WM_CAP_START + 62;
- private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;
- private const int WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + 63;
- private const int WM_CAP_SET_OVERLAY = WM_CAP_START + 51;
- private const int WM_CAP_SET_PREVIEW = WM_CAP_START + 50;
- private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6;
- private const int WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2;
- private const int WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START + 3;
- private const int WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START + 5;
- private const int WM_CAP_SET_SCALE = WM_CAP_START + 53;
- private const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52;
- private IntPtr hWndC;
- private bool bWorkStart = false;
- private IntPtr mControlPtr;
- //private int mWidth;
- private int mWidth;
- private int mHeight;
- private int mLeft;
- private int mTop;
- /// <summary>
- /// 初始化显示图像
- /// </summary>
- /// <param name="handle">控件的句柄</param>
- /// <param name="left">开始显示的左边距</param>
- /// <param name="top">开始显示的上边距</param>
- /// <param name="width">宽度</param>
- /// <param name="height">高度</param>
- public Camera(IntPtr handle, int left, int top, int width, int height)
- {
- this.mControlPtr = handle;
- this.mWidth = width;
- this.mHeight = height;
- this.mLeft = left;
- this.mTop = top;
- }
- [DllImport("avicap32.dll")]
- private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
- [DllImport("avicap32.dll")]
- private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);
- [DllImport("User32.dll")]
- private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);
- //该函数错误
- //private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, long lParam);
- /// <summary>
- /// 开始显示
- /// </summary>
- public void Start()
- {
- if (bWorkStart)
- return;
- bWorkStart = true;
- byte[] lpszName = new byte[100];
- hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);
- if (hWndC.ToInt32() != 0)
- {
- 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);
- return;
- }
- }
- /// <summary>
- /// 停止显示
- /// </summary>
- public void Stop()
- {
- SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
- bWorkStart = false;
- }
- /// <summary>
- /// 抓图
- /// </summary>
- /// <param name="path">路径</param>
- public void GrabImage(string path)
- {
- IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
- SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
- }
- }
- }
- //该片段来自于http://www.codesnippet.cn/detail/1808201513477.html
来源: http://www.codesnippet.cn/detail/1808201513477.html