如何获取视频流

Xanl 2013-11-05 12:47:18

网上看到一段摄像的程序
发下：





 const short WM_CAP = 1024;

        const int WM_CAP_DRIVER_CONNECT = WM_CAP + 10;

        const int WM_CAP_DRIVER_DISCONNECT = WM_CAP + 11;

        const int WM_CAP_EDIT_COPY = WM_CAP + 30;

        const int WM_CAP_SET_PREVIEW = WM_CAP + 50;

        const int WM_CAP_SET_PREVIEWRATE = WM_CAP + 52;

        const int WM_CAP_SET_SCALE = WM_CAP + 53;

        const int WS_CHILD = 1073741824;

        const int WS_VISIBLE = 268435456;

        const short SWP_NOMOVE = 2;

        const short SWP_NOSIZE = 1;

        const short SWP_NOZORDER = 4;

        const short HWND_BOTTOM = 1;

        int iDevice = 0;

        int hHwnd;

        [System.Runtime.InteropServices.DllImport("user32", EntryPoint = "SendMessageA")]

        static extern int SendMessage(int hwnd, int wMsg, int wParam, [MarshalAs(UnmanagedType.AsAny)] 

            object lParam);

        [System.Runtime.InteropServices.DllImport("user32", EntryPoint = "SetWindowPos")]

        static extern int SetWindowPos(int hwnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);

        [System.Runtime.InteropServices.DllImport("user32")]

        static extern bool DestroyWindow(int hndw);

        [System.Runtime.InteropServices.DllImport("avicap32.dll")]

        static extern int capCreateCaptureWindowA(string lpszWindowName, int dwStyle, int x, int y, int nWidth, short nHeight, int hWndParent, int nID);

        [System.Runtime.InteropServices.DllImport("avicap32.dll")]

        static extern bool capGetDriverDescriptionA(short wDriver, string lpszName, int cbName, string lpszVer, int cbVer);

        

        private void OpenPreviewWindow()

        {

            int iHeight = 320;

            int iWidth = 200;

            

            hHwnd = capCreateCaptureWindowA(iDevice.ToString(), (WS_VISIBLE | WS_CHILD), 0, 0, 640, 480, picCapture.Handle.ToInt32(), 0);

            

            if (SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0) == 1)

            {

                SendMessage(hHwnd, WM_CAP_SET_SCALE, 1, 0);

                

                SendMessage(hHwnd, WM_CAP_SET_PREVIEWRATE, 66, 0);



                essage(hHwnd, WM_CAP_SET_PREVIEW, 1, 0);

                 

                SetWindowPos(hHwnd, HWND_BOTTOM, 0, 0, iWidth, iHeight, (SWP_NOMOVE | SWP_NOZORDER));

            }

            else

            {

                

                DestroyWindow(hHwnd);

            }

        }

        private void ClosePreviewWindow()

        {

            

            SendMessage(hHwnd, WM_CAP_DRIVER_DISCONNECT, iDevice, 0);

            

            DestroyWindow(hHwnd);

        }





        private void button1_Click(object sender, EventArgs e)

        {

            iDevice = int.Parse(device_number_textBox.Text);

            OpenPreviewWindow();

        }

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如何获取其中的视频流啊，这几个API都看遍了没有啊，

或者说是用其他API调用？？