关于duilib的编译问题

[u010269599]

昨天配置好环境的，程序能编译通过运行，今天就不行了，相同的代码，电脑都没关过，一点变动都没有。。。。
错误为：1>MSVCRTD.lib(crtexe.obj) : error LNK2019: 无法解析的外部符号 _main，该符号在函数 ___tmainCRTStartup 中被引用

代码如下
#pragma once
#include <UIlib.h>
using namespace DuiLib;

#ifdef _DEBUG
# ifdef _UNICODE
# pragma comment(lib, "DuiLib_ud.lib")
# else
# pragma comment(lib, "DuiLib_d.lib")
# endif
#else
# ifdef _UNICODE
# pragma comment(lib, "DuiLib_u.lib")
# else
# pragma comment(lib, "DuiLib.lib")
# endif
#endif

class CDuiFrameWnd : public CWindowWnd, public INotifyUI
{
public:
virtual LPCTSTR GetWindowClassName() const { return _T("DUIMainFrame"); }
virtual void Notify(TNotifyUI& msg) {}

virtual LRESULT HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
LRESULT lRes = 0;

if( uMsg == WM_CREATE )
{
CControlUI *pWnd = new CButtonUI;
pWnd->SetText(_T("Hello World")); // 设置文字
pWnd->SetBkColor(0xFF00FF00); // 设置背景色

m_PaintManager.Init(m_hWnd);
m_PaintManager.AttachDialog(pWnd);
return lRes;
}

if( m_PaintManager.MessageHandler(uMsg, wParam, lParam, lRes) )
{
return lRes;
}

return __super::HandleMessage(uMsg, wParam, lParam);
}

protected:
CPaintManagerUI m_PaintManager;
};

int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
{
CPaintManagerUI::SetInstance(hInstance);

CDuiFrameWnd duiFrame;
duiFrame.Create(NULL, _T("DUIWnd"), UI_WNDSTYLE_FRAME, WS_EX_WINDOWEDGE);
duiFrame.ShowModal();
return 0;
}