[QGIS-Developer] how to add mbtiles data

[weskerjiang at sina.cn]

I'm creating an standalone application with QGIS 3.0,I want to add mbtiles data,I use 
QgsRasterLayer *layer = new QgsRasterLayer(filePath,fileName,"gdal");
but layer->isValid()    is  false,the error has two messages
1.Cannot open GDAL dataset, "c:\XXXXXX\*.mbtiles" not recognized as a supported file format.
2.Provider is not valid(provider:gdal)

so what's wrong with it

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