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

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List: kde-bindings
Subject: Re: [Kde-bindings] Using Signals/Slots with String argument
From: Dimitar Dobrev <dpldobrev () yahoo ! com>
Date: 2013-10-29 12:51:24
Message-ID: 1383051084.11665.YahooMailNeo () web122404 ! mail ! ne1 ! yahoo ! com
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    You can use QtCoreApplication.Invoke. About InvokeMethod 

On Tuesday, October 29, 2013 2:46 PM, Mat Arge <argemat1010@gmail.com> wrote:

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@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@kde.org
> https://mail.kde.org/mailman/listinfo/kde-bindings

_______________________________________________
Kde-bindings mailing list
Kde-bindings@kde.org
https://mail.kde.org/mailman/listinfo/kde-bindings

and slots as strings, I will only make sure they work with in the new Qyoto version.

    Dimitar

[Attachment #5 (text/html)]

<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica \
Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt">&nbsp;&nbsp;&nbsp; You can use QtCoreApplication.Invoke. About InvokeMethod \
<div style="display: block;" class="yahoo_quoted"> <div style="font-family: \
HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> \
<div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, \
sans-serif; font-size: 12pt;"> <div dir="ltr"> On Tuesday, October \
29, 2013 2:46 PM, Mat Arge &lt;argemat1010@gmail.com&gt; wrote: </div> <div \
class="y_msg_container">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 <div class="yqt6454186082" id="yqtfd98996"> On \
Tuesday 29. October 2013 05:42:01 Dimitar Dobrev wrote: &gt;&nbsp; &nbsp; \
Hello, Mat, &gt; &gt;&nbsp; &nbsp; I don't know if adding \
slots as string has ever worked (it's not me who &gt; authored that part), I've \
never tried it. But let me ask you, why do you &gt; need it? Why don't you \
simply use the events that wrap signals? In your &gt; case that would be: &gt; &gt;&nbsp; &nbsp; &nbsp; &nbsp; dialogB1.Clicked += \
OnDialogIntClicked; &gt; &gt; &gt;&nbsp; \
&nbsp; About custom signals, it's analogous: I haven't tried them (and &gt; \
therefore I don't know if they've ever worked) but you can simply use &gt; \
Mono/.NET events instead. &gt; &gt;&nbsp; &nbsp; Regards, &gt;&nbsp; &nbsp; Dimitar &gt; &gt; &gt; &gt; &gt; On Tuesday, October 29, 2013 2:32 \
PM, Mat Arge &lt;<a shape="rect" ymailto="mailto:argemat1010@gmail.com" \
href="mailto:argemat1010@gmail.com">argemat1010@gmail.com</a>&gt; &gt; \
wrote: &gt; &gt; Hy! &gt; &gt; I am unable to use signals/slots which use String as an argument. I \
created &gt; the code below to watch the value of a QInputDialog, If I set its \
InputMode &gt; to IntINput, everything works fine. But if I use the TextInput \
InputMode I &gt; get the error message &gt; QSignalSpy: No \
such signal: 'textValueChanged(string)' &gt; &gt; Even worse, \
if I try to define my own signal MySignal which uses a string &gt; argument, \
once I emit it I first get the error &gt; &gt; Cannot handle \
'string' as slot argument &gt; &gt; promptly followed by a \
stacktrace, followed by a native stacktrace: &gt; Stacktrace: &gt; &gt;&nbsp; at (wrapper managed-to-native) \
QtCore.SignalInvocation.SignalEmit &gt; (string,string,intptr,intptr,int) \
&lt;0xffffffff&gt; &gt;&nbsp; at QtCore.SignalInvocation.Invoke &gt; (System.Runtime.Remoting.Messaging.IMessage) &lt;0x002af&gt; &gt;&nbsp; at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke &gt; (System.Runtime.Remoting.Proxies.RealProxy,System.Runtime.Remoting.Messaging &gt; .IMessage,System.Exception&amp;,object[]&amp;) &lt;0x003e3&gt; &gt;&nbsp; at (wrapper runtime-invoke) &gt; \
&lt;Module&gt;.runtime_invoke_object_object_object_Exception&amp;_object[]&amp; &gt; (object,intptr,intptr,intptr) &lt;0xffffffff&gt; &gt;&nbsp; \
at (wrapper managed-to-native) &gt; \
object.__icall_wrapper_mono_remoting_wrapper (intptr,intptr) &lt;0xffffffff&gt; &gt;&nbsp; at (wrapper remoting-invoke) IMySignals.MySignal (string) \
&lt;0xffffffff&gt; &gt;&nbsp; at Dialog.&lt;Dialog&gt;m__1 () \
&lt;0x000d2&gt; &gt;&nbsp; at (wrapper runtime-invoke) \
object.runtime_invoke_void__this__ &gt; (object,intptr,intptr,intptr) \
&lt;0xffffffff&gt; &gt;&nbsp; at (wrapper managed-to-native) \
System.Reflection.MonoMethod.InternalInvoke &gt; \
(System.Reflection.MonoMethod,object,object[],System.Exception&amp;) &gt; \
&lt;0xffffffff&gt; at System.Reflection.MonoMethod.Invoke &gt; \
(object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],Sys &gt; tem.Globalization.CultureInfo) &lt;0x0013f&gt; &gt;&nbsp; at \
System.Reflection.MethodBase.Invoke (object,object[]) &lt;0x00022&gt; &gt;&nbsp; at System.Delegate.DynamicInvokeImpl (object[]) &lt;0x001bf&gt; &gt;&nbsp; at System.MulticastDelegate.DynamicInvokeImpl (object[]) \
&lt;0x00033&gt; &gt;&nbsp; at System.Delegate.DynamicInvoke (object[]) \
&lt;0x00016&gt; &gt;&nbsp; at QtCore.SmokeInvocation.InvokeDelegate \
(System.Delegate,intptr) &gt; &lt;0x000bf&gt; at (wrapper native-to-managed) &gt; QtCore.SmokeInvocation.InvokeDelegate (System.Delegate,intptr) \
&lt;0xffffffff&gt; &gt;&nbsp; at (wrapper managed-to-native) \
QtCore.SmokeInvocation.CallSmokeMethod &gt; \
(intptr,int,intptr,intptr,int,intptr) &lt;0xffffffff&gt; &gt;&nbsp; at \
QtCore.SmokeInvocation.Invoke (string,string,System.Type,bool,object[]) &gt; \
&lt;0x00277&gt; &gt;&nbsp; at QtGui.QApplication.Exec () &lt;0x00047&gt; &gt;&nbsp; at Dialog.Main (string[]) &lt;0x00047&gt; &gt;&nbsp; \
at (wrapper runtime-invoke) &lt;Module&gt;.runtime_invoke_int_object &gt; \
(object,intptr,intptr,intptr) &lt;0xffffffff&gt; &gt; &gt; \
Native stacktrace: &gt; &gt;&nbsp; &nbsp; &nbsp; &nbsp; \
mono() [0x80e903d] &gt;&nbsp; &nbsp; &nbsp; &nbsp; \
linux-gate.so.1(__kernel_rt_sigreturn+0) [0xb772b410] &gt; ... &gt; &gt; Here is my sample code: &gt; &gt; using System; &gt; using QtCore; &gt; using \
QtGui; &gt; &gt; public class Dialog : QWidget &gt; { &gt;&nbsp; int width = 250; &gt;&nbsp; \
int height = 200; &gt; &gt; &gt;&nbsp; \
public Dialog() &gt;&nbsp; { &gt;&nbsp; &nbsp; WindowTitle = \
"Input test"; &gt; &gt;&nbsp; &nbsp; Resize(width, \
height); &gt; &gt;&nbsp; &nbsp; var vbox = new \
QVBoxLayout(this); &gt;&nbsp; &nbsp; QPushButton quit = new \
QPushButton("Quit"); &gt;&nbsp; &nbsp; Connect(quit, SIGNAL("clicked()"), () \
=&gt; QCoreApplication.Quit()); &gt;&nbsp; &nbsp; vbox.AddWidget(quit); &gt;&nbsp; &nbsp; &gt;&nbsp; &nbsp; QPushButton dialogB1 = new \
QPushButton("Dialog Int"); &gt;&nbsp; &nbsp; Connect(dialogB1, \
SIGNAL("clicked()"), this, &gt; SLOT("OnDialogIntClicked()")); &gt;&nbsp; &nbsp; vbox.AddWidget(dialogB1); &gt; &gt;&nbsp; &nbsp; QPushButton dialogB2 = new QPushButton("Dialog Text"); &gt;&nbsp; &nbsp; Connect(dialogB2, SIGNAL("clicked()"), this, &gt; SLOT("OnDialogTextClicked()")); &gt;&nbsp; &nbsp; \
vbox.AddWidget(dialogB2); &gt;&nbsp; &gt;&nbsp; &nbsp; \
QPushButton mySig = new QPushButton("MySignal"); &gt;&nbsp; &nbsp; \
Connect(mySig, SIGNAL("clicked()"), () =&gt; {Emit.MySignal("Signal emitted &gt; at "+DateTime.Now);}); &gt;&nbsp; &nbsp; \
vbox.AddWidget(mySig); &gt;&nbsp; &nbsp; &gt;&nbsp; &nbsp; \
Show(); &gt;&nbsp; &nbsp; } &gt; &gt;&nbsp; \
[Q_SLOT] &gt;&nbsp; &nbsp; public void OnDialogIntClicked() &gt;&nbsp; &nbsp; { &gt;&nbsp; &nbsp; &nbsp; var dialog = new \
QInputDialog(this); &gt;&nbsp; &nbsp; &nbsp; dialog.inputMode = \
QInputDialog.InputMode.IntInput; &gt;&nbsp; &nbsp; &nbsp; dialog.Open(); &gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Connect(dialog, \
SIGNAL("intValueChanged(int)"), (int i) =&gt; &gt; {Console.WriteLine("New Int \
value: '{0}'", i);}); &gt;&nbsp; &nbsp; } &gt; &gt;&nbsp; [Q_SLOT] &gt;&nbsp; &nbsp; public void \
OnDialogTextClicked() &gt;&nbsp; &nbsp; { &gt;&nbsp; &nbsp; \
&nbsp; var dialog = new QInputDialog(this); &gt;&nbsp; &nbsp; &nbsp; \
dialog.inputMode = QInputDialog.InputMode.TextInput; &gt;&nbsp; &nbsp; &nbsp; \
dialog.Open(); &gt;&nbsp; &nbsp; &nbsp; Connect(dialog, \
SIGNAL("textValueChanged(string)"), (string s) =&gt; &gt; \
{Console.WriteLine("New Text value: '{0}'", s);}); &gt;&nbsp; &nbsp; } &gt;&nbsp; &gt;&nbsp; protected new IMySignals Emit { &gt;&nbsp; &nbsp; get { &gt;&nbsp; &nbsp; &nbsp; return \
(IMySignals) Q_EMIT; &gt;&nbsp; &nbsp; } &gt;&nbsp; } &gt; &gt; &gt;&nbsp; &nbsp; [STAThread] &gt;&nbsp; &nbsp; &nbsp; public static int Main(string[] args) &gt;&nbsp; &nbsp; &nbsp; { &gt;&nbsp; &nbsp; &nbsp; &nbsp; new \
QApplication(args); &gt;&nbsp; &nbsp; &nbsp; &nbsp; var app = new Dialog(); &gt;&nbsp; &nbsp; &nbsp; &nbsp; return QApplication.Exec(); &gt;&nbsp; &nbsp; &nbsp; } &gt; } &gt; &gt; public interface IMySignals : IQWidgetSignals { &gt;&nbsp; \
&nbsp; &nbsp; &nbsp; [Q_SIGNAL("mySignal(string)")] &gt;&nbsp; &nbsp; &nbsp; \
&nbsp; void MySignal(string val); &gt; } &gt; &gt; &gt; cheers &gt; Mat &gt; \
_______________________________________________ &gt; Kde-bindings mailing \
list &gt; <a shape="rect" ymailto="mailto:Kde-bindings@kde.org" \
href="mailto:Kde-bindings@kde.org">Kde-bindings@kde.org</a> &gt; <a \
shape="rect" href="https://mail.kde.org/mailman/listinfo/kde-bindings" \
target="_blank">https://mail.kde.org/mailman/listinfo/kde-bindings</a> </div> <div class="yqt6454186082" \
id="yqtfd28258">_______________________________________________ Kde-bindings \
mailing list <a shape="rect" ymailto="mailto:Kde-bindings@kde.org" \
href="mailto:Kde-bindings@kde.org">Kde-bindings@kde.org</a> <a shape="rect" \
href="https://mail.kde.org/mailman/listinfo/kde-bindings" \
target="_blank">https://mail.kde.org/mailman/listinfo/kde-bindings</a> </div> </div> </div> </div> </div> and slots as strings, I will only make \
sure they work with in the new Qyoto version. &nbsp;&nbsp;&nbsp; \
Dimitar </div></body></html>

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