[Qt-interest] problem about creating library

[程梁]

Hi, all! I tried to create a library with Qt but I can't run. There is no
compile error although.
There is my code:

/ --- test.pro
|
ui ---- ui.pro
| | -- mainwindow.h
| | -- mainwindow.cpp
| | -- ui_global.h
|
app ----- app.pro
| --- main.cpp

test.pro

   1.  TEMPLATE = subdirs
   2.  CONFIG += ordered
   3.  SUBDIRS += ui app

app.pro

   1.  TARGET = test
   2.  TEMPLATE = app
   3.  CONFIG += debug
   4.  SOURCES += main.cpp
   5.  LIBS += E:/documents/test/app/lib/ui.dll
   6.  INCLUDEPATH += ../ui

main.cpp

   1.  // Since this is a library, I think I should use it just like QtGui
   and so on, so I include necessary head files and create an instance as usual
   2.  #include <QtGui/QApplication>
   3.  #include "mainwindow.h"
   4.
   5.  int main(int argc, char *argv[])
   6.  {
   7.  QApplication <http://doc.qt.nokia.com/latest/qapplication.html> a(argc,
   argv);
   8.  MainWindow win;
   9.  win.show();
   10.  return a.exec();
   11.  }

ui.pro

   1.  # also I should edit this file in order to generate a library instead
   of a plugin
   2.  TARGET = ui
   3.  TEMPLATE = lib
   4.  DEFINES += UI_LIBRARY
   5.  CONFIG += debug
   6.  SOURCES += mainwindow.cpp
   7.  HEADERS += mainwindow.h \
   8.  ui_global.h
   9.  FORMS += mainwindow.ui
   10.  DESTDIR = ../app/lib

ui_global.h

   1.  #ifndef UI_GLOBAL_H
   2.  #define UI_GLOBAL_H
   3.
   4.  #include <QtCore/qglobal.h>
   5.
   6.  #if defined(UI_LIBRARY)
   7.  # define UISHARED_EXPORT Q_DECL_EXPORT
   8.  #else
   9.  # define UISHARED_EXPORT Q_DECL_IMPORT
   10.  #endif
   11.
   12.  #endif // UI_GLOBAL_H

mainwindow.h

   1.  // OK, this is almost what QtCreator generated for me
   2.  #ifndef MAINWINDOW_H
   3.  #define MAINWINDOW_H
   4.
   5.  #include <QMainWindow>
   6.  #include "ui_global.h"
   7.
   8.  namespace Ui {
   9.  class MainWindow;
   10.  }
   11.
   12.  class UISHARED_EXPORT MainWindow : public
QMainWindow<http://doc.qt.nokia.com/latest/qmainwindow.html>
   {
   13.  Q_OBJECT
   14.  public:
   15.  MainWindow(QWidget
<http://doc.qt.nokia.com/latest/qwidget.html> *parent
   = 0);
   16.  ~MainWindow();
   17.  protected:
   18.  void changeEvent(QEvent <http://doc.qt.nokia.com/latest/qevent.html>
   *e);
   19.  private:
   20.  Ui::MainWindow *ui;
   21.  };
   22.
   23.  #endif // MAINWINDOW_H

I ignored cpp and ui files since they are all just like what QtCreator
generated for me.

I tried to check test.exe by Dependency Walker and it shows the ui.dll. Then
I copied
this dll to the same directory of test.exe neither I run from QtCreator nor
double click
can run it. In QtCreator it gives me exit code -1073741819

Some one told me I should have a ui.lib with ui.dll but I really don't. What
should I do?

-- 
Cheng Liang
from: chengliang.soft at gmail.com
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