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<p class="MsoNormal">Hi (again) !<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I figured out (after 2 days of research !) that in a standalone app, to be able to open a custom layer form when identifying a feature, I have to implement a specific QgsPythonRunner child class (code below).<o:p></o:p></p>
<p class="MsoNormal">And then I have to set the QgsPythonRunner.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The problem is that I can’t get <b><span style="font-family:"Courier New"">evalCommand()</span></b> to work because the variable
<b><span style="font-family:"Courier New"">result</span></b> is a C++ reference, and python can’t deal with it, can it ?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Maybe there is a workaround I didn’t think through, or there is a need to pass
<b><span style="font-family:"Courier New"">result </span></b>as a return value ?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks !<o:p></o:p></p>
<p class="MsoNormal">BR<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">class PythonRunnerStandalone(QgsPythonRunner):<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> def __init__(self):<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> super().__init__()<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> def runCommand(self, command, messageOnError):<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> try:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> exec(command, globals())<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> return True<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> except Exception as e:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> if messageOnError == "":<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> print("Error with command:\n")<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> else:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> print(messageOnError + "\n")<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> print(command)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> print("Catched exception:\n", e)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> return False<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> def evalCommand(self, command, result):<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> try:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> result = eval(command)
<b># problem here<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> return True<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> except Exception as e:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> print("Error with command:\n")<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> print(command)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> print("Catched exception:\n", e)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> return False<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">qgis.core.QgsPythonRunner.setInstance(PythonRunnerStandalone())<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In QGIS source code qgis-latest/qgis-3.8.2/src/gui/qgsattributeform.cpp lines 1610-1625:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> QString numArgs;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> // Check for eval result<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> if ( QgsPythonRunner::eval( QStringLiteral( "len(inspect.getargspec(%1)[0])" ).arg( initFunction ), numArgs ) )
<b>// Here numArgs is passed as reference to my python implementation</b><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">[…]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> if ( numArgs == QLatin1String( "3" ) )
<b>// always fails here<o:p></o:p></b></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:FR">Jacky Volpes<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:FR">HR Team pour la Société du Canal de Provence | 2SI - QGIS<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:FR">Le Tholonet, CS70064<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:FR"><a href="mailto:jacky.volpes-ext@canal-de-provence.com">jacky.volpes-ext@canal-de-provence.com</a>
<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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