Engine中如何输出地图为图片？

 

public System.Boolean CreateJPEGHiResolutionFromActiveView(ESRI.ArcGIS.Carto.IActiveView activeView, System.String pathFileName) 

{ 

//parameter check 

if (activeView == null || !(pathFileName.EndsWith(.jpg))) 

{ 

return false; 

} 

ESRI.ArcGIS.Output.IExport export = new ESRI.ArcGIS.Output.ExportJPEGClass(); 

export.ExportFileName = pathFileName; 



// Because we are exporting to a resolution that differs from screen 

// resolution, we should assign the two values to variables for use 

// in our sizing calculations 

System.Int32 screenResolution = 96; 

System.Int32 outputResolution = 600; 



export.Resolution = outputResolution; 



ESRI.ArcGIS.esriSystem.tagRECT exportRECT; // This is a structure 



exportRECT.left = 0; 

exportRECT.top = 0; 

exportRECT.right = activeView.ExportFrame.right * (outputResolution / screenResolution); 

exportRECT.bottom = activeView.ExportFrame.bottom * (outputResolution / screenResolution); 



// Set up the PixelBounds envelope to match the exportRECT 

ESRI.ArcGIS.Geometry.IEnvelope envelope = new ESRI.ArcGIS.Geometry.EnvelopeClass(); 

envelope.PutCoords(exportRECT.left, exportRECT.top, exportRECT.right, exportRECT.bottom); 

export.PixelBounds = envelope; 



System.Int32 hDC = export.StartExporting(); 



activeView.Output(hDC, (System.Int16)export.Resolution, ref exportRECT, null, null); // Explicit Cast and ''ref'' keyword needed 

export.FinishExporting(); 

export.Cleanup(); 



return true; 

}