DirectX9 ID3DXFont DrawText Problem.

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My game using DirectX 9.

Code
------------------------------------------
HRESULT CD3DFontX::DrawText( FLOAT x, FLOAT y, DWORD dwColor, const
TCHAR* strText, DWORD dwFlags )
{
if( m_pd3dxFont && strText )
{
RECT rectText;
ZeroMemory ( &rectText, sizeof(RECT) );
rectText.left = (LONG)x;
rectText.top = (LONG)y;

//size_t nlen = wcslen(wszText);
size_t nlen = strlen(strText);
if ( nlen!=0 )
{
m_pd3dxFont->DrawTextA ( NULL, strText, nlen, &rectText,
DT_SINGLELINE|DT_EXPANDTABS|DT_CALCRECT, dwColor ); //DT_NOPREFIX
m_pd3dxFont->DrawTextA ( NULL, strText, nlen, &rectText,
DT_SINGLELINE|DT_EXPANDTABS|DT_NOCLIP, dwColor ); //DT_NOPREFIX
}
}
return S_OK;
}
------------------------------------------

This code work fine (english, japanese, traditional chinese).

But [codepage 874(Thailand) / character set(THAI_CHARSET)/
Font(Tahoma/CordiaUPC)] program crash at DrawTextA

DirectX 9 Sample (CustomUI) also crash when using font Tahoma or
CordiaUPC (Thai IME).

Have any solution?
--
Sorry for my poor english

.

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