Segmentation error in Vala - gtk

Please, tell me what the problem is. After receiving the input field from the Glade file and attempting to use it, a segmentation error is caused.
namespace MyApp {
class MyAppClass : Object {
Entry myAppEntry;
public MyAppClass () {
Builder builder = new Builder.from_file("myApp.ui");
myAppEntry = builder.get_object("myAppEntry") as Entry;
}
public void button_click(){
stdout.write(myAppEntry.get_text().data); //There is a segmentation error
}
}
}

Related

How to use interface MyCssResource in Utility class (GWT/ GWTP)?

I have
public interface MyResource extends ClientBundle{
#NotStrict
#Source("/myResource.css")
MyCssResource css();
}
public interface MyCssResource extends CssResource {
String gridEvenRow();
String gridOddRow();
.... more styling here....
}
in TestView.java
#UiField MyResource res;
#Inject
public TestView(final Binder binder) {
widget = binder.createAndBindUi(this);
res.css().ensureInjected();
}
In TestPresenter.java, I can style Grid without any problem.
for (int i = 1; i < myGrid.getRowCount(); i++) {
if((i%2) == 0){
myGrid.getRowFormatter().addStyleName(i, getView().getRes().css().gridEvenRow());
}
else{
myGrid.getRowFormatter().addStyleName(i, getView().getRes().css().gridOddRow());
}
}
But I don't want to repeat this code every time I initialize a Grid. So I want to put this code into a Utility class so that I can use it by just 1 line of code. Utility.formatGridOddEvenRow(myGrid);
Here is code in Utility
public class Utility {
public static MyResource res;
public Utility(){
res.css().ensureInjected();
}
public static void formatGridOddEvenRow(Grid grid){
for (int i = 1; i < grid.getRowCount(); i++) {
if((i%2) == 0){
grid.getRowFormatter().addStyleName(i, res.css().gridEvenRow());
}
else{
grid.getRowFormatter().addStyleName(i, res.css().gridOddRow());
}
}
}
}
However, it got run-time error [ERROR] - Uncaught exception escaped ? or some kind of error i don't know.
so, How to use interface MyCssResource in Utility class (GWT/ GWTP)?
public static final MyResource res=GWT.create(MyResource.class)
static{res.css().ensureInjected()}
add this code anywhere and use it. if you give all of your code, may be more helpfull.
I Hope constructor is not called can you check place an alert and see is ensureInjected() is called.
As per Java Static method calling doesn't need object creation. so Utility Object is not created so constructor will not be called.
For GWT CssResources it is must ensureInjected() called before applying the css.

How do I manage console output in a long running Eclipse plug-in?

I have written an Eclipse plugin that works. What happens, though, is that during the run, no console output is displayed. Only when the process is finished does the output show up in the console. Below is my handler, which appears as an extension point of type org.eclipse.ui.commands:
public class MyHandler extends AbstractHandler {
#Override
public Object execute(ExecutionEvent event) throws ExecutionException {
...
MessageConsoleStream out = myConsole.newMessageStream();
...
IConsoleView view = (IConsoleView) page.showView(id);
view.display(myConsole);
...
out.println("output that only shows up at the end");
myConsole.activate();
...
// Slow process
...
out.println("everything is done");
return null;
}
}
So while the process runs, nothing in the console. Then at the end, both output lines pop into view.
I'm obviously doing the console thing incorrectly, but I haven't found any good examples, nor has my experimentation proven very fruitful. Please advise.
You could consider using a ProgressMonitor (possibly with cancelation in case the user wants to abort), so that the user can see that there is something going on.
This worked:
public class Merge extends AbstractHandler {
private static MessageConsole myConsole = null;
private static ExecutionEvent event = null;
#Override
public Object execute(ExecutionEvent event) throws ExecutionException {
Merge.event = event;
//same idea as original post and other examples where it makes new or finds existing
myConsole = makeConsole(Merge.event);
Job job = new Job("My Job Name"){
#Override
protected IStatus run(IProgressMonitor monitor){
...
if (blah) {
MessageConsoleStream out = myConsole.newMessageStream();
out.println("output show up right away");
...
// Slow process
...
out.println("everything is done");
} else {
MessageDialog.openInformation(HandlerUtil.getActiveShell(Merge.event), "Information", "Please select valid file");
}
monitor.done();
return Status.OK_STATUS;
}
};
job.setUser(true);
job.schedule();
return null;
}
...
}
Maybe you can call out.flush() after every out.print...

Problem on aboutBox() in java

I'm developing a javadesktop application in Netbeans 6.9 and everything is perfect but...it gives me an error on this :
#Action
public void showAboutBox()
{
if (aboutBox == null) {
JFrame mainFrame = Mp4App.getApplication().getMainFrame();
aboutBox = new mp4AboutBox(mainFrame);
aboutBox.setLocationRelativeTo(mainFrame);
}
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
and this is the error :
Compiling 1 source file to Q:\Mp3 App\mp4-beta\mp4\build\classes
Q:\Mp3 App\mp4-beta\mp4\src\mp4\Mp4View.java:223: cannot find symbol
symbol : class mp4AboutBox
location: class mp4.Mp4View
aboutBox = new mp4AboutBox(mainFrame);
1 error
Q:\Mp3 App\mp4-beta\mp4\nbproject\build-impl.xml:603:
The following error occurred while executing this line:
Q:\Mp3 App\mp4-beta\mp4\nbproject\build-impl.xml:284: Compile failed; see the compiler error output for details.
BUILD FAILED (total time: 8 seconds)
the real problem is that this is the code generated from netbeans...also if you create a new Project->java->Destop Application and you leave it there without adding nothing,it gives always me the same problem... what to do ????????????
netbeans version: 6.9.1
jdk version: 7
O.S : Windows 7 32 bit
You shouldn't create your GUI using Netbeans because it generates unreadable code. The Swing-Package is pretty straight forward, so you should use it.
To the Error: Do you have a mp4AboutBox-class and what is in it?
You might be missing an import. Provide your imports in that file.
I had a similar question that I got the solution to by re-installing netbeans 6.9.1.
This is the solution I came up with from that:
TestProject class:
import org.jdesktop.application.Application;
import org.jdesktop.application.SingleFrameApplication;
public class TestProject extends SingleFrameApplication {
#Override protected void startup() {
show(new AppView(this));
}
#Override protected void configureWindow(java.awt.Window root) { }
public static TestProject getApplication() {
return Application.getInstance(TestProject.class);
}
public static void main(String[] args) {
launch(TestProject.class, args);
}
}
AppView JFrame:
import org.jdesktop.application.FrameView;
import org.jdesktop.application.SingleFrameApplication;
public class AppView extends FrameView {
public AppView(SingleFrameApplication app) {
super(app);
JFrame mainFrame = TestProject.getApplication().getMainFrame();
AboutBox newAboutBox = new AboutBox();
newAboutBox.setLocationRelativeTo(mainFrame);
TestProject.getApplication().show(newAboutBox);
}
}

Error with Invoke method in a domainservice class

i'm new with silverlight/ria and i have a problem wath i don't understand.
I have the following code in my domain services class
[EnableClientAccess()]
[KnownType(typeof(ModeleEmailEa))]
[KnownType(typeof(ModeleSmsEa))]
public class EAEMailDomainService : DomainService
{
#region ModeleEnvoiEa CRUD
[Query()]
public IQueryable<ModeleEnvoiEa> SelectAllModeleEnvoiEa()
{
ModeleEnvoiEaSrv modeleService = new ModeleEnvoiEaSrv();
return modeleService.GetList<ModeleEnvoiEa>();
}
[Update]
public void UpdateModeleEnvoiEa(ModeleEnvoiEa modele)
{
ModeleEnvoiEaSrv modeleService = new ModeleEnvoiEaSrv();
modeleService.Update(modele);
}
[Insert]
public void InsertModeleEnvoiEa(ModeleEnvoiEa modele)
{
ModeleEnvoiEaSrv modeleService = new ModeleEnvoiEaSrv();
modeleService.Insert(modele);
}
[Delete]
public void DeleteModeleEnvoiEa(ModeleEnvoiEa modele)
{
ModeleEnvoiEaSrv modeleService = new ModeleEnvoiEaSrv();
modeleService.Delete(modele);
}
[Invoke]
public void Test(int valeur)
{
//Do something
}
#endregion
And this code in my Silverlight application
Context.Test(2, action =>
{
// Do something
}, null);
The function SelectAll, Update, Delete , Insert work's fine but the 'Test' function generated the following error:
an attempt was made to load a program
with an incorrect format
any ideas ?
I have found that if i write the function invocation like this it's works
Context.Test(2,new System.Action<InvokeOperation<Int>>(ModeleEnvoiEa_Completed),null);
}
void ModeleEnvoiEa_Completed(InvokeOperation invoke)
{
// Do something
}
but if i use a lambda expression like this, i have an error, why ?
Context.Test(2, action =>
{
// This code generate an error
// an attempt was made to load a program with an incorrect format
}, null);

How to use gtk/glade in vala

I'm trying to make a simple app with glade/gtk/vala. So far I have this:
using Gtk;
class HelloWorldApp : GLib.Object {
const string UI = "test.glade";
public Window main_window;
[CCode (instance_pos = -1)]
public void on_btn_hello_clicked(Button source) {
stdout.printf("Hello, world");
}
construct {
Builder builder = new Builder();
builder.add_from_file(UI);
main_window = builder.get_object("window1") as Window;
main_window.destroy.connect(Gtk.main_quit);
builder.connect_signals(this);
}
}
class HelloWorld : GLib.Object {
public static int main(string[] args) {
Gtk.init (ref args);
HelloWorldApp h = new HelloWorldApp();
h.main_window.show_all();
Gtk.main();
return 0;
}
}
When I run this it outputs:
(helloworld:22641): Gtk-WARNING **: Could not find signal handler 'on_btn_hello_clicked'
but otherwise runs fine apart from the handler not being called
What am I doing wrong?
You are doing one or more of the following three things wrong:
When you compile a program using Gtk.Builder, you have to add --pkg gmodule-2.0 to your valac command line. (link)
When you place your signal handlers inside a class and/or namespace, you have to add the class and/or namespace name to the handler name in Glade, so you should be connecting to hello_world_app_on_btn_hello_clicked. (link)
If you are on Windows, you also have to add [CCode (cname="G_MODULE_EXPORT on_btn_hello_clicked")]. (link)
the live.gnome.org has all those informations, including the Windows quirks: http://live.gnome.org/Vala/GTKSample#Loading_User_Interface_from_XML_File