视频API类摄像头代码,CSharp代码库,德仔网

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【CSharp】视频API类摄像头
作者:kunkun0921 / 发布于2015/1/26/ 1283

	using System;
	using System.Collections.Generic;
	using System.Text;
	using System.Runtime.InteropServices;
	using System.Drawing.Design
	;

	namespace QQClass
	{
	 public class VideoAPI //视频API类
	 {
	 // 视频API调用
	 [DllImport("avicap32.dll")]
	 public static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
	 [DllImport("avicap32.dll")]
	 public static extern bool capGetDriverDescriptionA(short wDriver, byte[] lpszName, int cbName, byte[] lpszVer, int cbVer);
	 [DllImport("User32.dll")]
	 public static extern bool SendMessage(IntPtr hWnd, int wMsg, bool wParam, int lParam);
	 [DllImport("User32.dll")]
	 public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, int lParam);

	 // 常量
	 public const int WM_USER = 0x400;
	 public const int WS_CHILD = 0x40000000;
	 public const int WS_VISIBLE = 0x10000000;
	 public const int SWP_NOMOVE = 0x2;
	 public const int SWP_NOZORDER = 0x4;
	 public const int WM_CAP_DRIVER_CONNECT = WM_USER + 10;
	 public const int WM_CAP_DRIVER_DISCONNECT = WM_USER + 11;
	 public const int WM_CAP_SET_CALLBACK_FRAME = WM_USER + 5;
	 public const int WM_CAP_SET_PREVIEW = WM_USER + 50;
	 public const int WM_CAP_SET_PREVIEWRATE = WM_USER + 52;
	 public const int WM_CAP_SET_VIDEOFORMAT = WM_USER + 45;
	 public const int WM_CAP_START = WM_USER;
	 public const int WM_CAP_SAVEDIB = WM_CAP_START + 25;
	 }
	
	 public class cVideo //视频类
	 {
	 private IntPtr lwndC; //保存无符号句柄
	 private IntPtr mControlPtr; //保存管理指示器
	 private int mWidth;
	 private int mHeight;

	 public cVideo(IntPtr handle, int width, int height)
	 {
	 mControlPtr = handle; //显示视频控件的句柄
	 mWidth = width; //视频宽度
	 mHeight = height; //视频高度
	 }
	 /// <summary>
	 /// 打开视频设备
	 /// </summary>
	 public void StartWebCam()
	 {
	 byte[] lpszName = new byte[100];
	 byte[] lpszVer = new byte[100];

	 VideoAPI.capGetDriverDescriptionA(0, lpszName, 100, lpszVer, 100);
	 this.lwndC = VideoAPI.capCreateCaptureWindowA(lpszName, VideoAPI.WS_CHILD | VideoAPI.WS_VISIBLE, 0, 0, mWidth, mHeight, mControlPtr, 0);

	 if (VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_CONNECT, 0, 0))
	 {
	 VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEWRATE, 100, 0);
	 VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEW, true, 0);
	 }
	 }
	 /// <summary>
	 /// 关闭视频设备
	 /// </summary>
	 public void CloseWebcam()
	 {
	 VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_DISCONNECT, 0, 0);
	 }

	 /// <summary>
	 /// 拍照
	 /// </summary>
	 /// <param name="path">要保存bmp文件的路径</param>
	 public void GrabImage(IntPtr hWndC, string path)
	 {
	 IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
	 VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
	 }
	 }

	
	}
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　视频API类　　摄像头　
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