Qt Pluggin issue
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Hello,
I have a question regarding Qt Pluggin.
I am doing a little audio application which plays sounds (and other stuff) from instruments.
I have an abstract class Instrument and the instruments subclass this Instrument class for exemple Piano, etc ...
I want to make some of these instruments available as plugins. For example I created Violon.dll as Qt Plugin when I do a new Violin in my code its working fine.
However, if after the release of the binary, I want to create another instrument lets say Cello, I won't be able to write the piece of code with Instrument* instrument = new Cello.
How could I make that working if I don't know before the release, the instruments I will create after the release of the binary?
Cheers, -
For example, here is a piece of code I found...
@QObject *plugin = pluginLoader.instance();
if (plugin) {
myInstrument = qobject_cast<Instrument *>(plugin);@The only issue I have is that I have a menu in the GUI which is showing all the instruments available. I can dynamically add the new instrument names to this list using myInstrument->getName() but can I say if you click on "Cello" in the menu it creates a Cello, etc ... Cause to do myInstrument->getName() you already have an instance of an implemented Instrument... It's messy for me :(
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Can this work :
You create an instance of all the instrument pluggins to have access to their name and load the names in the GUI menu.
@foreach (QString fileName, pluginsDir.entryList(QDir::Files)) {
QPluginLoader pluginLoader(pluginsDir.absoluteFilePath(fileName));
QObject *plugin = pluginLoader.instance();
if (plugin) {
myInstrument = qobject_cast<Instrument *>(plugin);
if (myInstrument)
return true;
}
}
@Then call createInstrument(QString name):
@void createInstrument(QString name){
// assuming the instrumentName is the same as the dll file name
QPluginLoader pluginLoader(pluginsDir.absoluteFilePath(name));
QObject *plugin = pluginLoader.instance();
if (plugin) {
myInstrument = qobject_cast<Instrument *>(plugin);@}
Should this work?
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Hi,
Did you take a look at the "Plug and Paint" example ? It seems to fit your use case
Hope it helps
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Hello SGaist,
Didn't have a look at that particular exemple.
Thank you very much,
Cheers
