我有一个用于IP摄像机的SDK,负责开始接收流的功能需要将IntPtr传递给Window,该窗口将用于显示流。在WPF中,我只能在while窗口上显示图像,因为只有窗口在WPF中具有Handle。我试图打开新窗口并将内容复制到主窗口中的某些控件中,但没有取得很大的成功。是否有任何选择,例如使虚拟IntPtr并以某种方式从中获取图像/流?
[DllImport("dhnetsdk.dll")]
public static extern IntPtr CLIENT_StartRealPlay(IntPtr lLoginID, int nChannelID, IntPtr hWnd, EM_RealPlayType rType, fRealDataCallBackEx cbRealData, fRealPlayDisConnectCallBack cbDisconnect, IntPtr dwUser, uint dwWaitTime);
您可以使用System.Windows.Media.Imaging.WriteableBitmap
并将其IntPtr句柄传递给相机的SDK调用。
这里是一个例子:
private void VideoSampleReady(byte[] sample, uint width, uint height, int stride, WriteableBitmap wBmp, System.Windows.Controls.Image dst)
{
if (sample != null && sample.Length > 0)
{
this.Dispatcher.BeginInvoke(new Action(() =>
{
if (wBmp == null || wBmp.Width != width || wBmp.Height != height)
{
wBmp = new WriteableBitmap(
(int)width,
(int)height,
96,
96,
PixelFormats.Bgr24,
null);
dst.Source = wBmp;
}
// Reserve the back buffer for updates.
wBmp.Lock();
Marshal.Copy(sample, 0, wBmp.BackBuffer, sample.Length);
// Specify the area of the bitmap that changed.
wBmp.AddDirtyRect(new Int32Rect(0, 0, (int)width, (int)height));
// Release the back buffer and make it available for display.
wBmp.Unlock();
}), System.Windows.Threading.DispatcherPriority.Normal);
}
}