directwrite - IDWriteTextFormat::SetTextAlignment 不适用于 DWRITE_TEXT_ALIGNMENT_JUSTIFIED

Question

IDWriteTextFormat::SetTextAlignment 用于在 DirectWrite 中对齐文本，它采用 DWRITE_TEXT_ALIGNMENT 类型的参数

enum DWRITE_TEXT_ALIGNMENT {
  DWRITE_TEXT_ALIGNMENT_LEADING,
  DWRITE_TEXT_ALIGNMENT_TRAILING,
  DWRITE_TEXT_ALIGNMENT_CENTER,
  DWRITE_TEXT_ALIGNMENT_JUSTIFIED 
};

前 3 个类型都工作正常，但最后一个 DWRITE_TEXT_ALIGNMENT_JUSTIFIED 不起作用，当我尝试设置它时，出现无效参数错误

HRESULT hr = g_pTextFormat->SetTextAlignment(DWRITE_TEXT_ALIGNMENT_JUSTIFIED);
if(FAILED(hr))
{
    MessageBox(NULL, L"Center text failed!", L"Error", 0);
    return;
}

这似乎不是一个有效的论点，为什么？有人遇到同样的问题吗？

Answer 1

从Microsoft DirectX论坛得到答案，是因为，这个flag不支持Win7，但SDK文档中没有指出。 http://xboxforums.create.msdn.com/forums/p/108456/640004.aspx#640004