[Kde-bindings] Using Signals/Slots with String argument

[Mat Arge]

What I acutally want to achieve, is to change the UI from a different thread. 
According to the www, executing code in the UI thread can either be achieved 
via QMetaObject.InvokeMethod (see my other message to the list today) or via a 
signal/slot combination and so far I haven't managed to make either of them 
work in Qyoto.

cheers
Mat

On Tuesday 29. October 2013 05:42:01 Dimitar Dobrev wrote:
>     Hello, Mat,
> 
>     I don't know if adding slots as string has ever worked (it's not me who
> authored that part), I've never tried it. But let me ask you, why do you
> need it? Why don't you simply use the events that wrap signals? In your
> case that would be:
> 
>        dialogB1.Clicked += OnDialogIntClicked;
> 
> 
>     About custom signals, it's analogous: I haven't tried them (and
> therefore I don't know if they've ever worked) but you can simply use
> Mono/.NET events instead.
> 
>     Regards,
>     Dimitar
> 
> 
> 
> 
> On Tuesday, October 29, 2013 2:32 PM, Mat Arge <argemat1010 at gmail.com>
> wrote:
> 
> Hy!
> 
> I am unable to use signals/slots which use String as an argument. I created
> the code below to watch the value of a QInputDialog, If I set its InputMode
> to IntINput, everything works fine. But if I use the TextInput InputMode I
> get the error message
> QSignalSpy: No such signal: 'textValueChanged(string)'
> 
> Even worse, if I try to define my own signal MySignal which uses a string
> argument, once I emit it I first get the error
> 
> Cannot handle 'string' as slot argument
> 
> promptly followed by a stacktrace, followed by a native stacktrace:
> Stacktrace:
> 
>   at (wrapper managed-to-native) QtCore.SignalInvocation.SignalEmit
> (string,string,intptr,intptr,int) <0xffffffff>
>   at QtCore.SignalInvocation.Invoke
> (System.Runtime.Remoting.Messaging.IMessage) <0x002af>
>   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke
> (System.Runtime.Remoting.Proxies.RealProxy,System.Runtime.Remoting.Messaging
> .IMessage,System.Exception&,object[]&) <0x003e3>
>   at (wrapper runtime-invoke)
> <Module>.runtime_invoke_object_object_object_Exception&_object[]&
> (object,intptr,intptr,intptr) <0xffffffff>
>   at (wrapper managed-to-native)
> object.__icall_wrapper_mono_remoting_wrapper (intptr,intptr) <0xffffffff>
>   at (wrapper remoting-invoke) IMySignals.MySignal (string) <0xffffffff>
>   at Dialog.<Dialog>m__1 () <0x000d2>
>   at (wrapper runtime-invoke) object.runtime_invoke_void__this__
> (object,intptr,intptr,intptr) <0xffffffff>
>   at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke
> (System.Reflection.MonoMethod,object,object[],System.Exception&)
> <0xffffffff> at System.Reflection.MonoMethod.Invoke
> (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],Sys
> tem.Globalization.CultureInfo) <0x0013f>
>   at System.Reflection.MethodBase.Invoke (object,object[]) <0x00022>
>   at System.Delegate.DynamicInvokeImpl (object[]) <0x001bf>
>   at System.MulticastDelegate.DynamicInvokeImpl (object[]) <0x00033>
>   at System.Delegate.DynamicInvoke (object[]) <0x00016>
>   at QtCore.SmokeInvocation.InvokeDelegate (System.Delegate,intptr)
> <0x000bf> at (wrapper native-to-managed)
> QtCore.SmokeInvocation.InvokeDelegate (System.Delegate,intptr) <0xffffffff>
>   at (wrapper managed-to-native) QtCore.SmokeInvocation.CallSmokeMethod
> (intptr,int,intptr,intptr,int,intptr) <0xffffffff>
>   at QtCore.SmokeInvocation.Invoke (string,string,System.Type,bool,object[])
> <0x00277>
>   at QtGui.QApplication.Exec () <0x00047>
>   at Dialog.Main (string[]) <0x00047>
>   at (wrapper runtime-invoke) <Module>.runtime_invoke_int_object
> (object,intptr,intptr,intptr) <0xffffffff>
> 
> Native stacktrace:
> 
>         mono() [0x80e903d]
>         linux-gate.so.1(__kernel_rt_sigreturn+0) [0xb772b410]
> ...
> 
> Here is my sample code:
> 
> using System;
> using QtCore;
> using QtGui;
> 
> public class Dialog : QWidget
> {
>   int width = 250;
>   int height = 200;
> 
> 
>   public Dialog()
>   {
>     WindowTitle = "Input test";
> 
>     Resize(width, height);
> 
>     var vbox = new QVBoxLayout(this);
>     QPushButton quit = new QPushButton("Quit");
>     Connect(quit, SIGNAL("clicked()"), () => QCoreApplication.Quit());
>     vbox.AddWidget(quit);
>    
>     QPushButton dialogB1 = new QPushButton("Dialog Int");
>     Connect(dialogB1, SIGNAL("clicked()"), this,
> SLOT("OnDialogIntClicked()"));
>     vbox.AddWidget(dialogB1);
> 
>     QPushButton dialogB2 = new QPushButton("Dialog Text");
>     Connect(dialogB2, SIGNAL("clicked()"), this,
> SLOT("OnDialogTextClicked()"));
>     vbox.AddWidget(dialogB2);
>  
>     QPushButton mySig = new QPushButton("MySignal");
>     Connect(mySig, SIGNAL("clicked()"), () => {Emit.MySignal("Signal emitted
> at "+DateTime.Now);});
>     vbox.AddWidget(mySig);
>    
>     Show();
>    }
> 
>   [Q_SLOT]
>     public void OnDialogIntClicked()
>     {
>       var dialog = new QInputDialog(this);
>       dialog.inputMode = QInputDialog.InputMode.IntInput;
>       dialog.Open();
>             Connect(dialog, SIGNAL("intValueChanged(int)"), (int i) =>
> {Console.WriteLine("New Int value: '{0}'", i);});
>     }
> 
>   [Q_SLOT]
>     public void OnDialogTextClicked()
>     {
>       var dialog = new QInputDialog(this);
>       dialog.inputMode = QInputDialog.InputMode.TextInput;
>       dialog.Open();
>       Connect(dialog, SIGNAL("textValueChanged(string)"), (string s) =>
> {Console.WriteLine("New Text value: '{0}'", s);});
>     }
>  
>   protected new IMySignals Emit {
>     get {
>       return (IMySignals) Q_EMIT;
>     }
>   }
> 
> 
>    [STAThread]
>      public static int Main(string[] args)
>      {
>        new QApplication(args);
>        var app = new Dialog();
>        return QApplication.Exec();
>      }
> }
> 
> public interface IMySignals : IQWidgetSignals {
>         [Q_SIGNAL("mySignal(string)")]
>         void MySignal(string val);
> }
> 
> 
> cheers
> Mat
> _______________________________________________
> Kde-bindings mailing list
> Kde-bindings at kde.org
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