Tjank you Nyall, i have already been able to build C++ QGIS , the only thing i can't do right now is get a new plugin to be registered within the UI. It has become a secret art like magic to do this.
I am bemoaning the lack of user guidance here. I will write one once i get through this. I plan to put at least one example code on how to generate a stub plugin. I cleaned all the compile errors, and there an obscure message on some fumction that i don't even have in my plugin that is coming up during compile. I am compiling only my plugin separately. I used a simple UI (i am not new to UI's in C++ as i have done several more complex ones before. Thank you for your kindness though. And i will touch base more. Blessings and Happy All Hallows Eve. On Sun, Oct 27, 2019, 12:52 PM Nyall Dawson <[email protected]> wrote: > On Sun, 27 Oct 2019 at 11:27, Maaza Mekuria <[email protected]> wrote: > > > > Nyall , Thank you for your response. > > I heard that argument before and replied by saying that i had tried > Python and the program was too slow for the application i was working on > (data structures and storage) and that was my main reason to use C++. But > i was told that i need to learn more Python and be a better programmer etc > ... > > > > I felt i was completely ignored. At that time i was able to do it on > my own becuase there was a lot more private activity. I think now QGIS has > almost become corporate and there is some hesitation to share information > (not knowledge) unless a transaction happens. > > In complete honesty, you're totally misreading the situation. There's > nothing malicious or hidden going on here at all. It's entirely the > fact that c++ plugins, especially on windows, are a PITA to develop > and a totally lottery as to whether they'll work. The only assistance > the project is **able** to provide has already been provided -- "avoid > c++ plugins"! > > My personal thoughts: I would LOVE nothing more than to be able to > help people like yourself with problems like this, and donate 3-4 > hours of my time to helping you fix your local Windows build and get > things working for you. (There's absolutely no sarcasm here, I really > mean that). I wish society was structured in such a way as to make > this possible. But the world just doesn't work that way, and there's > **nothing** that the QGIS project or the people involved with it can > do to change that. So your only options here are: > 1. ask for help, which you've already done, and unfortunately no-one > has an answer for you. Maybe you could "widen the net" and try asking > on other channels outside of this mailing list and stackexchange, and > hopefully find someone who has previously solved this problem. > 2. (as Jürgen stated) push through and find the solution for yourself > -- the source is all available and obviously have some development > skills to help here. > 3. follow the (unfortunate? unfair?) process society has evolved to > get others to do work for you, and pay someone to find a solution to > your build issue. > > Nyall > > > > > > In my opinion this has become a barrier to innovate. > > > > Thank you again, > > > > . > > > > On Sat, Oct 26, 2019, 2:35 PM Nyall Dawson <[email protected]> > wrote: > >> > >> On Sun, 27 Oct 2019 at 09:01, Maaza Mekuria <[email protected]> > wrote: > >> > > >> > Thank you Etienne. I did just what you suggested. But did not het > anywhere. I still get the same error message. > >> > > >> > My question did not get resolved and only for lack of information i > can't move forward with the upgrade. > >> > What i think has happened is that QGIS leadership has chosen to > control the access gates to "ousiders" who want to program in C++ and > related functiions in producing plugins by controlling how plugins are > registered. > >> > > >> > It is a pity that I can't upgrade this plugin for lack of information. > >> > > >> > In the past i have donated money and willing to donate time and > money. Whay is there so much secrecy on the basic C++ plugin > initialization and registry? It does not make for a good and inclusive > policy. > >> > >> There's no conspiracy here -- rather, c++ plugins have always been > >> horrible to build, deploy and debug (especially on Windows). Over time > >> the core project recognised this, realised it was a bad situation for > >> developers like yourself, and started encouraging people to completely > >> avoid using c++ plugins and move to Python wherever possible. > >> > >> I strongly suspect that the reason no-one has answered your question > >> is just because no-one **knows** the answer! (I certainly don't -- I > >> saw your earlier thread, and the only advice I was able to offer at > >> the time was what Etienne had already suggested). > >> > >> Nyall > >> > >> > >> > > >> > Thank for your help anyway. > >> > > >> > > >> > On Sun, Sep 15, 2019, 9:11 PM Etienne Trimaille < > [email protected]> wrote: > >> >> > >> >> Hi, > >> >> > >> >> I can't really answer your question but you should use > https://qgis.org/api/classQgsMapLayerComboBox.html instead of creating > your own combobox. (if possible). > >> >> > >> >> Etienne > >> >> > >> >> Le dim. 15 sept. 2019 à 10:11, Maaza Mekuria <[email protected]> > a écrit : > >> >>> > >> >>> QGIS Layer List upgrade to V3 C++ plugin - Geographic Information > Systems Stack Exchange <style>body,.top-bar{margin-top:1.9em}</style> > >> >>> > >> >>> I was upgrading a c++ plugin that I had used in the past and almost > eliminated all the the usual compiler errors due to version changes > according for the current version (3.6). The plugin used to collect current > map canvas layers in a combo list box for selection. I am getting two > errors that I can't figure out what to do with. This code compiled without > problem pre-2.0. > >> >>> > >> >>> The first happens to be about QGSMapLayer that can't be > instantiated because it is turned as an abstract class and I am getting an > error [Severity Code Description Project File Line Source Suppression State > Error C2259 'QgsMapLayer': cannot instantiate abstract class > tarjan_sccplugin C:\OSGeo4W64\apps\Qt5\include\QtCore\qlist.h 214 Build ] > >> >>> > >> >>> This is portion of the code generating the error. Where > cmbNetSourceLayer is a combo-box . > >> >>> > >> >>> void tarjan_sccGui::populateLayers( QString const& url ) { > cmbNetSourceLayer->clear(); > >> >>> > >> >>> QString layerName; QString layerType; > >> >>> > >> >>> // fill list of layers > >> >>> QMap<QString, QgsMapLayer*> mapLayers = > QgsProject::instance()->mapLayers(); > >> >>> QMap<QString, QgsMapLayer*>::iterator layer_it = mapLayers.begin(); > >> >>> > >> >>> for (; layer_it != mapLayers.end(); ++layer_it) > >> >>> { > >> >>> QgsVectorLayer* vl = > dynamic_cast<QgsVectorLayer*>(layer_it.value()); > >> >>> if (!vl) > >> >>> continue; > >> >>> else > >> >>> > >> >>> cmbNetSourceLayer->addItem(vl->name() ); > >> >>> } > >> >>> > >> >>> The second error appears to be in explicit declaration for the > plugin. Something has changed in how the plugins are initiated. [Severity > Code Description Project File Line Source Suppression State Error (active) > invalid explicit instantiation declaration tarjan_sccplugin > d:\GIS\v3\Quantum-GIS\src\core\qgsoptionalexpression.h 82 IntelliSense ] > >> >>> > >> >>> No idea what must be done to overcome this error. The cited module > appears to be an optional data module. > >> >>> > >> >>> > >> >>> Any help is appreciated. > >> >>> > >> >>> _______________________________________________ > >> >>> QGIS-Developer mailing list > >> >>> [email protected] > >> >>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > >> >>> Unsubscribe: > https://lists.osgeo.org/mailman/listinfo/qgis-developer > >> > > >> > _______________________________________________ > >> > QGIS-Developer mailing list > >> > [email protected] > >> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > >> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer >
_______________________________________________ QGIS-Developer mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
