3条回答
- qq_26763017 2015-04-13 13:47关注
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
namespace video
{
public class VideoWork
{
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 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 “> 要显示的宽度 </param> /// <param name= “height “> 要显示的长度 </param> public VideoWork(IntPtr handle, int left, int top, int width, int height) { mControlPtr = handle; mWidth = width; mHeight = height; mLeft = left; 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); // //这里特别注意,因为WinAPI中的long为32位,而C#中的long为64wei,所以需要将lParam该为int // [DllImport("User32.dll ")] private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam); /// <summary> /// 开始显示图像 /// </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); //Global.log.Write( “SendMessage “); } 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 “> 要保存bmp文件的路径 </param> public void GrabImage(string path) { IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt32()); } /// <summary> /// 录像 /// </summary> /// <param name="path">要保存avi文件的路径</param> public void Kinescope(string path) { IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt32()); SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0); } /// <summary> /// 停止录像 /// </summary> public void StopKinescope() { SendMessage(hWndC, WM_CAP_STOP, 0, 0); } }
}
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