Taskbar Preview

HWND H;
H=FindWindow("Shell_TrayWnd",NULL); //находим хандл окна таскбара
ShowWindow(H, SW_HIDE);//делаем его невидимым

    ::Graphics::TBitmap * bmp = new ::Graphics::TBitmap;
    bmp->PixelFormat = pf32bit;
 
    Gdiplus::Graphics g(bmp->Canvas->Handle);
    g.SetPageUnit(UnitPixel);
    RectF bounds(0, 0, Form1->Width, Form1->Height);
 
    Gdiplus::LinearGradientBrush brush(bounds, Color(100, 0, 0, 0), Color(255, 0, 0, 0), Gdiplus::LinearGradientModeHorizontal);
    g.SetSmoothingMode(SmoothingModeAntiAlias);
    g.SetInterpolationMode(InterpolationModeHighQualityBicubic);
 
    StringFormat format;
    format.SetAlignment(StringAlignmentCenter);
    format.SetLineAlignment(StringAlignmentCenter);
    Font font(L"Segoe UI Light", 72, FontStyleBold);
 
    wchar_t * Time = Now().TimeString().t_str();
    g.DrawString(Time, -1, &font, bounds, &format, &brush);
 
    DWORD DEnable = DWMNCRP_ENABLED;
 
    if (S_OK != DwmSetWindowAttribute(Form1->Handle, DWMWA_FORCE_ICONIC_REPRESENTATION, &DEnable, sizeof(DEnable))) {
        MessageBox(0, L"Error1", 0, 0);
        exit(0);
    }
 
    if (S_OK != DwmSetWindowAttribute(Form1->Handle, DWMWA_HAS_ICONIC_BITMAP, &DEnable, sizeof(DEnable))) {
        MessageBox(0, L"Error2", 0, 0);
        exit(0);
    }
 
    if (S_OK != DwmSetIconicThumbnail(Form1->Handle, bmp->Handle, DWM_SIT_DISPLAYFRAME)) { // вот эта
        MessageBox(0, L"Error3", 0, 0); 
        exit(0);
    }
 
    delete bmp;