CAD——生成图片

dukeyongwang

 在『Kean』的BlockView.NET中有生成图片的功能，拷贝一个View,然后调用RenderToImage()方法，可是为什么总是提示【对象的当前状态使该操作无效】，请大家帮帮忙？

  private void OutputImageMenuItem_Click(object sender, EventArgs e)
    {
      // pick the place where o output the image type
      Autodesk.AutoCAD.Windows.SaveFileDialog dialog = new Autodesk.AutoCAD.Windows.SaveFileDialog("RenderToImage", null, "jpg;png;tif;bmp", "BlockViewSnapshotBrowseDialog", Autodesk.AutoCAD.Windows.SaveFileDialog.SaveFileDialogFlags.AllowAnyExtension);
      // if all is ok?
      if (DialogResult.OK == dialog.ShowDialog())
      {
        // create an offscreen device
        using (Device device = new Device())
        {
          // get the size of the GS view
          Size size = mPreviewCtrl.ClientRectangle.Size;
          // resize the device to this
          device.OnSize(size);
          device.BackgroundColor = Color.Black;
          device.SetLogicalPalette(GSUtil.MyAcadColorMs);
          device.OnRealizeBackgroundPalette();
          device.OnRealizeForegroundPalette();
         
          // make a copy of the gs view
          using (Autodesk.AutoCAD.GraphicsSystem.View view = mPreviewCtrl.mpView.Clone(true, true))
          {
            try
            {
              // add it to the device
              device.Add(view);
              // now render the image to a bitmap
              using (System.Drawing.Bitmap bitmap = view.RenderToImage())
              {
                // now save it out!!
                bitmap.Save(dialog.Filename);
              }
            }
            finally
            {
              // do a clear up
              device.EraseAll();
            }
          }
        }
      }
    }

雪山飞狐_lzh

        public Bitmap GetImage()
        {
            return m_Device.GetSnapshot(m_View.Viewport);
        }

dukeyongwang

真的可以实现生成图片。

我在这里提供第二种方法：

  调用WINAPI中的BitBlt()截屏方法，也可以实现。实现的效果一样。不过还是弧哥的方法简单，明了。