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#include <QApplication>
#include <QDialog>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QDialog D;
	
	app.setActiveWindow( &D );
    D.show();
    return app.exec();
}

Build Log

--------------------Configuration: 112 - Win32 Debug--------------------

Command Lines
Creating temporary file "C:\DOCUME~1\dov\LOCALS~1\Temp\RSPA5.tmp" with contents
[
/nologo /MLd /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /FR"Debug/" /Fp"Debug/112.pch" /YX /Fo"Debug/" /Fd"Debug/" /FD /GZ  /c 
"C:\Projects\112\main.cpp"
]
Creating command line "cl.exe @C:\DOCUME~1\dov\LOCALS~1\Temp\RSPA5.tmp" 
Creating temporary file "C:\DOCUME~1\dov\LOCALS~1\Temp\RSPA6.tmp" with contents
[
kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib  kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /incremental:yes /pdb:"Debug/112.pdb" /debug /machine:I386 /out:"Debug/112.exe" /pdbtype:sept 
.\Debug\main.obj
]
Creating command line "link.exe @C:\DOCUME~1\dov\LOCALS~1\Temp\RSPA6.tmp"
Compiling...
main.cpp
Linking...
main.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall QApplication::~QApplication(void)" (__imp_??1QApplication@@UAE@XZ)
main.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall QDialog::~QDialog(void)" (__imp_??1QDialog@@UAE@XZ)
main.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: static int __cdecl QApplication::exec(void)" (__imp_?exec@QApplication@@SAHXZ)
main.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: void __thiscall QWidget::show(void)" (__imp_?show@QWidget@@QAEXXZ)
main.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: static void __cdecl QApplication::setActiveWindow(class QWidget *)" (__imp_?setActiveWindow@QApplication@@SAXPAVQWidget@@@Z)
main.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall QDialog::QDialog(class QWidget *,class QFlags)" (__imp_??0QDialog@@QAE@PAVQWidget@@V?$QFlags@W4WindowType@Qt@@@@@Z)
main.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall QApplication::QApplication(int &,char * *)" (__imp_??0QApplication@@QAE@AAHPAPAD@Z)
Debug/112.exe : fatal error LNK1120: 7 unresolved externals
Error executing link.exe.
Output Window
Creating command line "bscmake.exe /nologo /o"Debug/112.bsc"  .\Debug\main.sbr"
Output Window


Results
112.exe - 8 error(s), 0 warning(s)