ArcGIS-导出为栅格地图

导出为栅格地图，

            if (m_Map == null) return;

            IExport pExport = null;
            switch (m_Index)
            {
                case 1:
                    pExport = new ExportBMPClass();
                    break;

                case 2:
                    pExport = new ExportGIFClass();
                    break;

                case 3:
                    pExport = new ExportJPEGClass();
                    break;

                case 4:
                    pExport = new ExportPNGClass();
                    break;

                case 5:
                    pExport = new ExportTIFFClass();
                    break;
            }
            // 分辨率
            int iResolution = trackBar.Value;

            tagRECT exportRect = new tagRECT();
            exportRect.left = 0;
            exportRect.top = 0;
            exportRect.right = 1024;
            exportRect.bottom = 768;

            // 定义输出图片的大小
            IEnvelope pPixelBoundsEnv = new EnvelopeClass();
            pPixelBoundsEnv.PutCoords(exportRect.left, exportRect.top, exportRect.right, exportRect.bottom);

            pExport.ExportFileName = m_strFileName;
            pExport.Resolution = iResolution;
            pExport.PixelBounds = pPixelBoundsEnv;

            IActiveView pActiveView = m_Map as IActiveView;
            int hDC = pExport.StartExporting();
            pActiveView.Output(hDC, iResolution, ref exportRect, pActiveView.FullExtent, null);
            pExport.FinishExporting();
            pExport.Cleanup();