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c# 怎么在form中通过摄像头拍照

发布时间： 2012-09-03 09:48:39 作者： rapoo

c# 如何在form中通过摄像头拍照
如题
请各路大侠指点迷津

[解决办法]
摄像头编程大全(源码)(c#)
C# 摄像头视频捕捉 (使用DirectX.Capture)
[解决办法]
貌似你要使用的DirectShow。
[解决办法]

C# code
using System;using System.Collections.Generic;using System.Text;using System.Runtime.InteropServices;namespace CamTest{    //参考AVICap技术    public class Cam    {        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 IntPtr mControlPtr;        private bool bWorkStart = false;        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 Cam(IntPtr handle, int left, int top, int width, int height)          {            mControlPtr = handle;            mWidth = width;            mHeight = height;            mLeft = left;            mTop = top;        }        // 创建捕捉窗口        //HWND VFWAPI capCreateCaptureWindow(        //      LPCSTR lpszWindowName，// 捕捉窗口名字        //      DWORD dwStyle，// 捕捉窗口的风格        //      int x，// 窗口左上角x轴坐标        //      int y，// 窗口左上角y轴坐标        //      int nWidth，// 窗口的宽度        //      int nHeight，// 窗口的高度        //      HWND HWnd，// 父窗口句柄        //      Int nID// 捕捉窗口的ID号        //);        //如果该函数调用成功 则函数返回窗口的句柄 否则函数返回NULL。        [DllImport("avicap32.dll")]        private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);    //      视频格式设置对话框    //    BOOL capDlgVideoFormat( hwnd ); // hwnd：捕捉窗口句柄    //视频格式设置对话框对于每一个捕捉驱动程序来说，是唯一的。而且，有些驱动程序不一定支持这一功能。应用程序可以通过检测CAPDRIVERCAPS结构的成员变量fHasDlgVideoFormat来判断驱动程序是否支持这一功能。        [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, IntPtr wParam, IntPtr 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, IntPtr.Zero, IntPtr.Zero);                SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, IntPtr.Zero, IntPtr.Zero);                SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, IntPtr.Zero, IntPtr.Zero);                SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, IntPtr.Zero, IntPtr.Zero);                SendMessage(hWndC, WM_CAP_SET_SCALE, (IntPtr)1, IntPtr.Zero);                SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, (IntPtr)66, IntPtr.Zero);                SendMessage(hWndC, WM_CAP_SET_OVERLAY, (IntPtr)1, IntPtr.Zero);                SendMessage(hWndC, WM_CAP_SET_PREVIEW, (IntPtr)1, IntPtr.Zero);            }            return;        }        /// <summary>        /// 停止显示图像        /// </summary>        public void Stop()        {            SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, IntPtr.Zero, IntPtr.Zero);            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);  //将System.String内容复制到非托管内存当中            SendMessage(hWndC, WM_CAP_SAVEDIB, IntPtr.Zero, hBmp);        }        ///<summary>        ///录像        ///</summary>        ///<param name="path">要保存avi文件的路径</param>        public void Kinescope(string path)        {            IntPtr hCap = Marshal.StringToHGlobalAnsi(path);            SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, IntPtr.Zero, hCap);            SendMessage(hWndC, WM_CAP_SEQUENCE, IntPtr.Zero, hCap);        }        ///<summary>        ///停止录像        ///</summary>        public void StopKinescope()        {            SendMessage(hWndC, WM_CAP_STOP, IntPtr.Zero, IntPtr.Zero);        }    }} 
 
[解决办法]
探讨
C# code
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace CamTest
{

    //参考AVICap技术
    public class Cam
    {
        p……

[解决办法]
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace CamTest
{

   //参考AVICap技术
   public class Cam
   {
       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 IntPtr mControlPtr;
       private bool bWorkStart = false;
       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 Cam(IntPtr handle, int left, int top, int width, int height) 
       {
           mControlPtr = handle;
           mWidth = width;
           mHeight = height;
           mLeft = left;
           mTop = top;
       }
       // 创建捕捉窗口
       //HWND VFWAPI capCreateCaptureWindow(
       //      LPCSTR lpszWindowName，// 捕捉窗口名字
       //      DWORD dwStyle，// 捕捉窗口的风格
       //      int x，// 窗口左上角x轴坐标
       //      int y，// 窗口左上角y轴坐标
       //      int nWidth，// 窗口的宽度
       //      int nHeight，// 窗口的高度
       //      HWND HWnd，// 父窗口句柄
       //      Int nID// 捕捉窗口的ID号
       //);
       //如果该函数调用成功 则函数返回窗口的句柄 否则函数返回NULL。
       [DllImport("avicap32.dll")]
       private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);

   //      视频格式设置对话框
   //    BOOL capDlgVideoFormat( hwnd ); // hwnd：捕捉窗口句柄
   //视频格式设置对话框对于每一个捕捉驱动程序来说，是唯一的。而且，有些驱动程序不一定支持这一功能。应用程序可以通过检测CAPDRIVERCAPS结构的成员变量fHasDlgVideoFormat来判断驱动程序是否支持这一功能。

       [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, IntPtr wParam, IntPtr 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, IntPtr.Zero, IntPtr.Zero);
               SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, IntPtr.Zero, IntPtr.Zero);
               SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, IntPtr.Zero, IntPtr.Zero);
               SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, IntPtr.Zero, IntPtr.Zero);
               SendMessage(hWndC, WM_CAP_SET_SCALE, (IntPtr)1, IntPtr.Zero);
               SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, (IntPtr)66, IntPtr.Zero);
               SendMessage(hWndC, WM_CAP_SET_OVERLAY, (IntPtr)1, IntPtr.Zero);
               SendMessage(hWndC, WM_CAP_SET_PREVIEW, (IntPtr)1, IntPtr.Zero);
           }
           return;
       }

       /// <summary>
       /// 停止显示图像
       /// </summary>
       public void Stop()
       {
           SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, IntPtr.Zero, IntPtr.Zero);
           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);  //将System.String内容复制到非托管内存当中
           SendMessage(hWndC, WM_CAP_SAVEDIB, IntPtr.Zero, hBmp);
       }

       ///<summary>
       ///录像
       ///</summary>
       ///<param name="path">要保存avi文件的路径</param>
       public void Kinescope(string path)
       {
           IntPtr hCap = Marshal.StringToHGlobalAnsi(path);
           SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, IntPtr.Zero, hCap);
           SendMessage(hWndC, WM_CAP_SEQUENCE, IntPtr.Zero, hCap);
       }

       ///<summary>
       ///停止录像
       ///</summary>
       public void StopKinescope()
       {
           SendMessage(hWndC, WM_CAP_STOP, IntPtr.Zero, IntPtr.Zero);
       }

   }
}


[解决办法]
去看下DirectShow技术
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