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Running build steps for project Dialog...
Starting: C:/Qt/2010.02/mingw/bin/mingw32-make.exe clean -w 
mingw32-make: Entering directory `C:/Documents and Settings/Administrator/My Documents/ddd/Signal/LayOut/Dialog'
C:/Qt/2010.02/mingw/bin/mingw32-make -f Makefile.Debug clean
mingw32-make[1]: Entering directory `C:/Documents and Settings/Administrator/My Documents/ddd/Signal/LayOut/Dialog'
del debug\moc_mainwindow.cpp debug\moc_finddialog.cpp
del ui_mainwindow.h
del debug\main.o debug\mainwindow.o debug\finddialog.o debug\moc_mainwindow.o debug\moc_finddialog.o
mingw32-make[1]: Leaving directory `C:/Documents and Settings/Administrator/My Documents/ddd/Signal/LayOut/Dialog'
C:/Qt/2010.02/mingw/bin/mingw32-make -f Makefile.Release clean
找不到 C:\Documents and Settings\Administrator\My Documents\ddd\Signal\LayOut\Dialog\debug\moc_mainwindow.cpp
找不到 C:\Documents and Settings\Administrator\My Documents\ddd\Signal\LayOut\Dialog\debug\main.o
mingw32-make[1]: Entering directory `C:/Documents and Settings/Administrator/My Documents/ddd/Signal/LayOut/Dialog'
del release\moc_mainwindow.cpp release\moc_finddialog.cpp
del ui_mainwindow.h
del release\main.o release\mainwindow.o release\finddialog.o release\moc_mainwindow.o release\moc_finddialog.o
mingw32-make[1]: Leaving directory `C:/Documents and Settings/Administrator/My Documents/ddd/Signal/LayOut/Dialog'
mingw32-make: Leaving directory `C:/Documents and Settings/Administrator/My Documents/ddd/Signal/LayOut/Dialog'
找不到 C:\Documents and Settings\Administrator\My Documents\ddd\Signal\LayOut\Dialog\release\moc_mainwindow.cpp
找不到 C:\Documents and Settings\Administrator\My Documents\ddd\Signal\LayOut\Dialog\ui_mainwindow.h
找不到 C:\Documents and Settings\Administrator\My Documents\ddd\Signal\LayOut\Dialog\release\main.o
Exited with code 0.
Starting: c:/qt/2010.02/qt/bin/qmake.exe C:/Documents and Settings/Administrator/My Documents/ddd/Signal/LayOut/Dialog/Dialog.pro -spec win32-g++ -r 
Exited with code 0.
Starting: C:/Qt/2010.02/mingw/bin/mingw32-make.exe -w 
mingw32-make: Entering directory `C:/Documents and Settings/Administrator/My Documents/ddd/Signal/LayOut/Dialog'
C:/Qt/2010.02/mingw/bin/mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `C:/Documents and Settings/Administrator/My Documents/ddd/Signal/LayOut/Dialog'
c:\Qt\2010.02\qt\bin\uic.exe mainwindow.ui -o ui_mainwindow.h
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"c:\Qt\2010.02\qt\include\QtCore" -I"c:\Qt\2010.02\qt\include\QtGui" -I"c:\Qt\2010.02\qt\include" -I"c:\Qt\2010.02\qt\include\ActiveQt" -I"debug" -I"." -I"c:\Qt\2010.02\qt\mkspecs\win32-g++" -o debug\main.o main.cpp
c:\Qt\2010.02\qt\include/QtGui/../../src/gui/kernel/qwidget.h: In function 'int qMain(int, char**)':
c:\Qt\2010.02\qt\include/QtGui/../../src/gui/kernel/qwidget.h:485: error: 'void QWidget::show()' is inaccessible
main.cpp:9: error: within this context
main.cpp:9: error: 'QWidget' is not an accessible base of 'FindDialog'
mingw32-make[1]: Leaving directory `C:/Documents and Settings/Administrator/My Documents/ddd/Signal/LayOut/Dialog'
mingw32-make: Leaving directory `C:/Documents and Settings/Administrator/My Documents/ddd/Signal/LayOut/Dialog'
mingw32-make[1]: *** [debug/main.o] Error 1
mingw32-make: *** [debug] Error 2
Exited with code 2.
Error while building project Dialog
When executing build step 'Make' --------------------编程问答-------------------- 设置Path环境变量就可以了 --------------------编程问答-------------------- 文件夹不要有空格。 --------------------编程问答--------------------
环境配置检查下，没问题，按楼上的方法试试。。。

补充：移动开发 ,  Qt