TANDARDSDK_500(ARMV4I)平台下的错误

[xccpp]

这是MFC程序在Win32平台下能正常运行，但是换到TANDARDSDK_500(ARMV4I)平台下出现如下三个错误：

错误 3 error C2065: 'WM_ICONERASEBKGND' : undeclared identifier
错误 8 error C2039: 'OnHelp' : is not a member of 'CWinApp'
错误 9 error C2065: 'OnHelp' : undeclared identifier

以下是出错程序的部分代码：
void CTry008Dlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // 用于绘制的设备上下文

SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

// 使图标在工作矩形中居中
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;

// 绘制图标
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}


BEGIN_MESSAGE_MAP(CTry008App, CWinApp)
ON_COMMAND(ID_HELP, &CWinApp::OnHelp)
END_MESSAGE_MAP()

请高手指点。谢谢