QGIS-2.8-PyQGISDeveloperCookbook-en(13)

时间：2026-01-17 来源：未知

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为开发人员准备的文档,涵盖QGIS的多种功能实现和代码。

Similarlytovectorlayers,rasterlayerscanbeloadedusingtheaddRasterLayerfunctionoftheQgisInterface:

Thiscreatesanewlayerandaddsittothemaplayerregistry(makingitappearinthelayerlist)inonestep.

RasterlayerscanalsobecreatedfromaWCSservice.

detailedURIsettingscanbefoundinproviderdocumentation

AlternativelyyoucanloadarasterlayerfromWMSserver.Howevercurrentlyit’snotpossibletoaccessGetCa-

pabilitiesresponsefromAPI—youhaveto

knowwhatlayersyouwant

3.3MapLayerRegistry

Ifyouwouldliketousetheopenedlayersforrendering,donotforgettoaddthemtomaplayerregistry.Themap

layerregistrytakesownershipoflayersandtheycanbelateraccessedfromanypartoftheapplicationby

their

uniqueID.Whenthelayerisremovedfrommaplayerregistry,itgetsdeleted,too.

Addingalayertotheregistry

Layersaredestroyedautomaticallyonexit,howeverifyouwanttodeletethelayer

explicitly,use

Foralistofloadedlayersandlayerids,use

TODO:Moreaboutmaplayerregistry?

QGIS-2.8-PyQGISDeveloperCookbook-en(13).doc 将本文的Word文档下载到电脑，方便复制、编辑、收藏和打印

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