TextOut() 似乎没有显示代理 UNICODE 对

Question

我试图使用TextOut()展示U+1D400(代理对H = 0xD835 L = 0xDC00)，但无济于事。为什么?

案例WM_PAINT:

    PAINTSTRUCT ps;
    BeginPaint(hwnd, &ps);
    int iLogPixelsY;
    iLogPixelsY = GetDeviceCaps(ps.hdc, LOGPIXELSY);
    LOGFONT lf;
    int iPts;
    iPts = 11;
    memset(&lf, 0, sizeof(LOGFONT));
    lf.lfHeight = -iPts * iLogPixelsY / 72;
    lf.lfOutPrecision = OUT_TT_ONLY_PRECIS;
    wcscpy_s(lf.lfFaceName, L"Cambria Math");
    HFONT hFont;
    hFont = CreateFontIndirect(&lf);
    hFont = (HFONT)SelectObject(ps.hdc, hFont);
    wchar_t tx[2];
    tx[0] = 0xD835;
    tx[1] = 0xDC00;
    TextOut(ps.hdc, 10, 100, tx, 1); 
    DeleteObject(SelectObject(ps.hdc, hFont));
    EndPaint(hwnd, &ps);
    break;

Answer 1

您正在调用TextOut指定字符串长度为1，但根据本文档，您应该传递2，因为它是一个代理对。