hello,
I tried to reproduce an example of program (from the magazine
"programmez", in french), using GWT, but there is an execution error,
which I cannot understand, but I know which lines are involved.
the program deals with a list of pictures; which are displayed.There
is a button "add" which allows to add a new picture, by entering its
name, its url.
the sample pictures are well displayed, but the error comes when I
want to add a new picture; the dialog box stays displayed a few
seconds and there is an error which makes the program stop.
the error is : "Invalid memory access of location 00000010
eip=95d4e77b".
here is the code.
there are 3 classes : Miniature (which concern each picture),
Formulaire (which manages the addition of picture), and test!1, the
main classe.
nothing really complicated.
Miniature
******************************************************************
package test.client;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.VerticalPanel;
public class Miniature extends Composite {
VerticalPanel panel;
Image miniature;
Label label;
public Miniature(String url, String titre){
miniature=new Image (url);
label=new Label(titre);
label.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);
panel = new VerticalPanel();
panel.add(miniature);
panel.add(label);
initWidget(panel);
setHeight("80px");
setWidth("80px");
setStyleName("miniature-float");
}
}
******************************************************************
Formulaire
******************************************************************
package test.client;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.*;
public class Formulaire extends DialogBox {
public TextBox saisieUrl = new TextBox();
public TextBox saisieTitre = new TextBox();
public Formulaire() {
super();
setText("Ajouter une nouvelle image");
Grid grid=new Grid(3,2);
grid.setWidget(0, 0, new Label("Url"));
grid.setWidget(0, 1, saisieUrl);
grid.setWidget(1, 0, new Label("Titre"));
grid.setWidget(1, 1, saisieTitre);
Button boutonAjouter = new Button("Ajouter");
grid.setWidget(2, 1, boutonAjouter);
boutonAjouter.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
Formulaire.this.hide();
}
});
add(grid);
center();
}
}
******************************************************************
test_1
******************************************************************
package test.client;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyUpEvent;
import com.google.gwt.event.dom.client.KeyUpHandler;
import com.google.gwt.event.logical.shared.CloseEvent;
import com.google.gwt.event.logical.shared.CloseHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.DialogBox;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.VerticalPanel;
/**
* Entry point classes define <code>onModuleLoad()</code>.
*/
public class Test_1 implements EntryPoint, ClickHandler,
CloseHandler<PopupPanel> {
private FlowPanel liste;
private Button boutonAjouter;
/**
* This is the entry point method.
*/
public void onModuleLoad() {
VerticalPanel verticalPanel = new VerticalPanel();
liste = new FlowPanel();
liste.add(new
Miniature("http://www.programmez.com/img/magazines/
couverture_119.jpg", "Mai 2009"));
liste.add(new
Miniature("http://www.programmez.com/img/magazines/
couverture_120.jpg", "Juin 2009"));
boutonAjouter = new Button("Ajouter");
boutonAjouter.addClickHandler(this);
verticalPanel.add(liste);
verticalPanel.add(boutonAjouter);
RootPanel.get().add(verticalPanel);
}
public void onClick(ClickEvent event){
if (event.getSource()==boutonAjouter){
//liste.add(new
Miniature("http://www.programmez.com/img/magazines/
couverture_121.jpg", "Juillet 2009"));
Formulaire fenetreAjout = new Formulaire();
fenetreAjout.addCloseHandler(this);
fenetreAjout.show();
}
}
public void onClose(CloseEvent<PopupPanel> event){
Formulaire fenetreAjout = (Formulaire) event.getTarget();
if (fenetreAjout != null){
String url=fenetreAjout.saisieUrl.getText();
String titre=fenetreAjout.saisieTitre.getText();
if (url.length() != 0){
liste.add(new Miniature(url, titre));
}
}
}
}
******************************************************************
the error comes from the method onClick in the previous class, because
if I replace the lines in this method by the commented one, the error
is no more here (but the comportment of the method is changed).
I use eclipse 3.5, I downloaded GWT via the update site (so the
version is the last one), and in macosx the java version is 6 which
support the 64 bit processors.
can you help me?
or tell me that the program has no bugs?
olivier.
--
You received this message because you are subscribed to the Google Groups
"Google Web Toolkit" group.
To post to this group, send email to google-web-tool...@googlegroups.com.
To unsubscribe from this group, send email to
google-web-toolkit+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-web-toolkit?hl=.
