I have an old application written by someone else that works fine on Windows XP. However when exactly the same code is run on Windows 7, the text displayed is offset by 1 character. For example "Category" becomes "B'sdfnqx".

The code is below and it is the DrawText function causing the problem. Any ideas why this might be?

Code :
OGLFontClass::OGLFontClass()
{
    m_id = -1;
}
 
OGLFontClass::~OGLFontClass()
{
    Clear();
}
 
void OGLFontClass::Clear()
{
    if( m_id != -1 )
    {
        glDeleteLists(m_id,255);
        m_id = -1;
    }
}
 
void OGLFontClass::Initialise(CString fontname, int size, HDC hDC)
{
    m_HDC = hDC;
    m_id = glGenLists(255);
    ::DeleteObject( m_FONT );
 
    m_FONT = CreateFont(    -size,              // Height Of Font ( NEW )
                            0,              // Width Of Font
                            0,              // Angle Of Escapement
                            0,              // Orientation Angle
                            FW_NORMAL,          // Font Weight
                            FALSE,              // Italic
                            FALSE,              // Underline
                            FALSE,              // Strikeout
                            ANSI_CHARSET,           // Character Set Identifier
                            OUT_TT_PRECIS,          // Output Precision
                            CLIP_DEFAULT_PRECIS,        // Clipping Precision
                            ANTIALIASED_QUALITY,        // Output Quality
                            FF_DONTCARE|DEFAULT_PITCH,  // Family And Pitch
                            fontname);          // Font Name
 
    HFONT oldfont = (HFONT)SelectObject(hDC, m_FONT);       // Selects The Font We Want
    wglUseFontBitmaps(hDC, 0, 255, m_id );          // Builds 96 Characters Starting At Character 32
    ::SelectObject( hDC, oldfont );
}
 
void OGLFontClass::DrawText(int x, int y, int r, int g, int b, CString text)
{
    glMatrixMode(GL_PROJECTION);
 
    glPushMatrix();
    glLoadIdentity();// Reset The View
 
    HWND hWnd = ::WindowFromDC(wglGetCurrentDC() );
 
    RECT rc;
    ::GetClientRect( hWnd, &rc );
 
    int CX = rc.right;//::GetSystemMetrics( SM_CXSCREEN );
    int CY = rc.bottom;//::GetSystemMetrics( SM_CYSCREEN );
 
    gluOrtho2D (0,::GetSystemMetrics(SM_CXSCREEN),::GetSystemMetrics(SM_CYSCREEN), 0);
 
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity();
 
    glColor3ub(r,g,b);  
 
    glRasterPos2d( x, y );   // had to do this to get the text to line up where i want it
 
    //glDisable(GL_TEXTURE_2D);
 
    glPushAttrib(GL_LIST_BIT);      // Pushes The Display List Bits     ( NEW )
    glListBase(m_id);               // Sets The Base Character to 32    ( NEW )
 
    unsigned char* szTemp = new unsigned char[text.GetLength()+1];
    strcpy((char*)szTemp, text);
 
    glCallLists(strlen((char*)szTemp), GL_UNSIGNED_BYTE, szTemp);   // Draws The Display List Text  ( NEW )
 
    delete[] szTemp;
 
    glPopAttrib();                      // Pops The Display List Bits   ( NEW )
 
    glPopMatrix();
 
    glMatrixMode(GL_PROJECTION);
 
    glPopMatrix();
 
    glMatrixMode(GL_MODELVIEW);
}
 
CSize OGLFontClass::GetTextExtent(CString text, float fFactor)
{
    SIZE sz;
    HFONT oldfont = (HFONT) SelectObject(m_HDC, m_FONT);
    GetTextExtentPoint32(m_HDC,text,strlen(text),&sz);
 
    SelectObject(m_HDC, oldfont);
 
    sz.cx *= 0.2;
    sz.cy *= 0.2;
 
    return sz;
}