Basics: Automatic use of a CRS for new layers

You are creating your own layers in QGIS through Python? Good job.

But everytime you do that QGIS punches you in the face with a prompt to select the coordinate-reference-system you want for the new layer.

To get rid of all that you need tell QGIS that you don't want that...easy right.

First you create a settings-variable. And because QGIS ist awesome you just use the PyQt4-Class QSettings. Then you set the value of "/Projections/defaultBehaviour" to whatever you need. There are three possibilities:

• "useGlobal" (use a preset CRS everytime)
• "useProject" (use the Project-CRS)
• "prompt" (use the stupid prompt thingy)

 'set new Layers to use the Project-CRS'  
 def enableUseOfGlobalCrs(self):  
     self.s = QSettings()  
     self.oldValidation = self.s.value("/Projections/defaultBehaviour").toString()
     self.s.setValue( "/Projections/defaultBehaviour", "useProject" )  

 'enable old settings again' 
 def disableUseOfGlobalCrs(self):  
     self.s.setValue( "/Projections/defaultBehaviour", self.oldValidation )  

Done.