// ArcGIS Snippet Title:
// Create JPEG from ActiveView
//
// Long Description:
// Creates a .jpg (JPEG) file from IActiveView. Default values of 96 DPI are used for the image creation.
//
// Add the following references to the project:
// ESRI.ArcGIS.Carto
// ESRI.ArcGIS.Display
// ESRI.ArcGIS.Geometry
// ESRI.ArcGIS.Output
// ESRI.ArcGIS.System
//
// Intended ArcGIS Products for this snippet:
// ArcGIS Desktop (ArcEditor, ArcInfo, ArcView)
// ArcGIS Engine
// ArcGIS Server
//
// Applicable ArcGIS Product Versions:
// 9.2
// 9.3
// 9.3.1
// 10.0
//
// Required ArcGIS Extensions:
// (NONE)
//
// Notes:
// This snippet is intended to be inserted at the base level of a Class.
// It is not intended to be nested within an existing Method.
//
///<summary>Creates a .jpg (JPEG) file from IActiveView. Default values of 96 DPI are used for the image creation.</summary>
///
///<param name="activeView">An IActiveView interface</param>
///<param name="pathFileName">A System.String that the path and filename of the JPEG you want to create. Example: "C:\temp\test.jpg"</param>
///
///<returns>A System.Boolean indicating the success</returns>
///
///<remarks></remarks>
private bool CreateJPEGFromActiveView(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;
// Microsoft Windows default DPI resolution
export.Resolution = 300;
ESRI.ArcGIS.esriSystem.tagRECT exportRECT = activeView.ExportFrame;
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);
// Finish writing the export file and cleanup any intermediate files
export.FinishExporting();
export.Cleanup();
MessageBox.Show("已将地图导出为jpg格式图片");
return(true);
}
// ArcGIS Snippet Title:
// Create JPEG (hi-resolution) from ActiveView
//
// Long Description:
// Creates a .jpg (JPEG) file from IActiveView using a high resolution exporting option. Default values of 96 DPI are overwritten to 300 used for the image creation.
//
// Add the following references to the project:
// ESRI.ArcGIS.Carto
// ESRI.ArcGIS.Display
// ESRI.ArcGIS.Geometry
// ESRI.ArcGIS.Output
//
// Intended ArcGIS Products for this snippet:
// ArcGIS Desktop (ArcEditor, ArcInfo, ArcView)
// ArcGIS Engine
// ArcGIS Server
//
// Applicable ArcGIS Product Versions:
// 9.2
// 9.3
// 9.3.1
// 10.0
//
// Required ArcGIS Extensions:
// (NONE)
//
// Notes:
// This snippet is intended to be inserted at the base level of a Class.
// It is not intended to be nested within an existing Method.
//
///<summary>Creates a .jpg (JPEG) file from the ActiveView using a high resolution exporting option. Default values of 96 DPI are overwritten to 300 used for the image creation.</summary>
///
///<param name="activeView">An IActiveView interface</param>
///<param name="pathFileName">A System.String that the path and filename of the JPEG you want to create. Example: "C:\temp\hiResolutionTest.jpg"</param>
///
///<returns>A System.Boolean indicating the success</returns>
///
///<remarks></remarks>
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 = 300;
export.Resolution = outputResolution;
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);
}
