Provides access to the Image Type Interface.
When To Use
Use IImageType to set the image format and the return type for MapServer output images. MapServer output images are created using ExportMapImage on IMapServer2 and the following methods on IMapServerLayout: ExportLayout, ExportLegend, ExportNorthArrow and ExportScaleBar.
Members
| Name | Description | |
|---|---|---|
 |
Format | The image format. |
|
ReturnType | The return type. |
IImageType.Format Property
The image format.
Public Property Format As esriImageFormat
public esriImageFormat Format {get; set;}
Remarks
Supported image formats include: BMP, JPG, DIB, TIFF, PNG, PNG24, PNG32, EMF, PS, PDF, GIF, SVG and SVGZ. When a PNG24 image is requested from MapServer and in the same request specifies a transparent color, a 32-bit PNG is returned in order to support the transparency. The transparency is within the alpha channel and only supports only binary transparency.
However PNG32 image format supports with full alpha channel transparency. PNG32 maintains transparency in the image that is set on the layer in the source map. To find out what image formats are supported by a map service, use the IMapServer2::ServiceConfigurationInfoproperty.
IImageType pImgType = new ImageType();
pImgType.Format = esriImagePNG32;
IImageType.ReturnType Property
The return type.
Public Property ReturnType As esriImageReturnType
public esriImageReturnType ReturnType {get; set;}
Remarks
ReturnType includes URL and MimeData. If URL is specified the image is stored as a file at the specified location (Physical Output Directory) and can be accessed by internet clients through the Virtual Output Directory. If MIME is specified a stream of bytes is returned to the client.
Classes that implement IImageType
| Classes | Description |
|---|---|
| ImageType | The Image Type coclass contains information about the type of image to be generated. |
Remarks
Supported image formats include: PNG32, PNG24, PNG, JPG, GIF, BMP, DIB, TIFF, EMF, PS, PDF, AI, SVG and SVGZ. Please note that optimized MapServices do not support the Adobe Illustrator (AI) format. However they additionally support the PNG32 image format with full alpha channel transparency support. ReturnType includes URL and MimeData. If URL is specified the image is stored as a file at the specified location (Physical Output Directory) and can be accessed by internet clients through the Virtual Output Directory. If MIME is specified a stream of bytes is returned to the client.