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

[Dimitar Dobrev]

    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[],System.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
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