QGIS » QGIS Application

May be, add a test before the line 78 in the qgscompoundcolorwidget.cpp and add the default color scheme if there is no scheme in the list
if (schemeList.empty()) {
QgsApplication::colorSchemeRegistry()->addDefaultSchemes();
schemeList=QgsApplication::colorSchemeRegistry()->schemes( QgsColorScheme::ShowInColorDialog );
}

Vincent Cloarec wrote:

When QgsApplication is not instanciate and the member mColorSchemeRegistry is empty, a crash appear when calling schemelist.at() (line 78 in qgscompoundcolorwidget.cpp). A way to avoid the crash is to add a color scheme to the registry before instantiate QgsCompoundColorWidget, but may be it would be nicer to avoid the crash even the registry is empty.

Hi, do you try to use QgsCompoundColorWidget from plugin or how can I replicate the issue?

Peter Petrik wrote:

Hi, do you try to use QgsCompoundColorWidget from plugin or how can I replicate the issue?

Hello,

I am developing a standalone application which is using QGis API. I have a dialog which is using the QgsRendererPropertiesDialog class. In this widget, when the QgsCompoundColorWidget class is construct, the program crash unless if i had a color scheme to the registry before instantiate QgsCompoundColorWidget class :

QgsApplication::colorSchemeRegistry()->addDefaultSchemes();

A simple example, in a context with QgsApplication is not instantiate :

QgsApplication::colorSchemeRegistry()->addDefaultSchemes(); <-- Whith this line, the QgsCompoundColorWidget class is instantiate and works, without this line, there is a crash.
QgsCompoundColorWidget* w=new QgsCompoundColorWidget();
w->show();