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   源码介绍

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网上很多代码调用摄像头，只能调用一次，那是程序内部处理写的有问题，我来给出一个全面的，绝对可用，放心下载

[DllImport("avicap32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern int capCreateCaptureWindowA([MarshalAs(UnmanagedType.VBByRefStr)]   ref   string lpszWindowName, int dwStyle, int x, int y, int nWidth, short nHeight, int hWndParent, int nID);
        [DllImport("avicap32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern bool capGetDriverDescriptionA(short wDriver, [MarshalAs(UnmanagedType.VBByRefStr)]   ref   string lpszName, int cbName, [MarshalAs(UnmanagedType.VBByRefStr)]   ref   string lpszVer, int cbVer);
        [DllImport("user32", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern bool DestroyWindow(int hndw);
        [DllImport("user32", EntryPoint = "SendMessageA", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern int SendMessage(int hwnd, int wMsg, int wParam, [MarshalAs(UnmanagedType.AsAny)]   object lParam);
        [DllImport("user32", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern int SetWindowPos(int hwnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);
        [DllImport("vfw32.dll")]
        public static extern string capVideoStreamCallback(int hwnd, videohdr_tag videohdr_tag);
        [DllImport("vicap32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern bool capSetCallbackOnFrame(int hwnd, string s);

private void OpenCapture()
        {          
            int intWidth = this.panel1.Width;
            int intHeight = this.panel1.Height;
            int intDevice = 0;
            string refDevice = intDevice.ToString();
            //创建视频窗口并得到句柄
            hHwnd = frmAdminPhoto.capCreateCaptureWindowA(ref   refDevice, 1342177280, 0, 0, 1024, 800, this.panel1.Handle.ToInt32(), 0);
            if (frmAdminPhoto.SendMessage(hHwnd, 0x40a, intDevice, 0) > 0)
            {
                frmAdminPhoto.SendMessage(this.hHwnd, 0x435, -1, 0);
                frmAdminPhoto.SendMessage(this.hHwnd, 0x434, 0x42, 0);
                frmAdminPhoto.SendMessage(this.hHwnd, 0x432, -1, 0);
                frmAdminPhoto.SetWindowPos(this.hHwnd, 1, 0, 0, intWidth, intHeight, 6);
            }
            else
            {
                frmAdminPhoto.DestroyWindow(this.hHwnd);
            }
        }