Well, I'm trying to loading the echoplugin, inculded in the Qt's 4.6.0 package from my application but i can't done it. I'm compiling on Windows with Visual Studio and VS Add-in, all projects works fine, and if i compile the Echoplugin example, it loads the plugin fine, but my application can't do it.

Here is the function:

Qt Code: 
  1. Programa::Programa(QWidget *parent, Qt::WFlags flags) : QMainWindow(parent, flags)
  2. {
  3.      ui.setupUi(this);
  4.      QDir pluginsDir(qApp->applicationDirPath());
  5.      pluginsDir.cd("plugins");
  6.      foreach (QString fileName,pluginsDir.entryList(QDir::Files))
  7.      { 
  8.           QPluginLoader pluginLoader(pluginsDir.absoluteFilePath(fileName));
  9.           QObject *plugin = pluginLoader.instance();
  10.  
  11.           if (plugin)
  12.           {
  13.                QMessageBox::information(this,"xD","Plugin cargado!!! :D");
  14.           }
  15.           else
  16.           {
  17.                QMessageBox::information(this,"xD",pluginLoader.errorString());
  18.           }
  19.      }
  20.  
  21.      return;
  22. }
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QPluginLoader::instance() returns always null, and the QPluginLoader::errorString() returns "Unknown Error". I think that the code isn't the problem, so i suspect that error could be in the project configuration. ?

Thanks in advance