调用GetFontData返回GDI_ERROR，是什么原因啊？（附调用代码）

[keeneyes]

CWnd * cwnd = AfxGetMainWnd();
CDC *PDC = cwnd->GetDC();
DWORD tag = MAKETABLENAME( 't','t','c','f');
DWORD size = PDC->GetFontData(tag, 0, NULL, 0);
if(size == GDI_ERROR)
unsigned long err = GetLastError();

窗口的字体换了好几种，TTF和TTC格式的字体都试过，size都是等于GDI_ERROR，
但GetLastError返回的错误码err为0。各位遇到过这种情况吗？应该怎么修改呢？

[keeneyes]

没人知道吗？

[jixingzhong]

the function returns the size of the buffer required for the font data specified in the dwTable parameter， while the 3rd parameter is NULL.

[jixingzhong]

GetLastError返回的错误码err为0

GetLastError returns 0 means that, the operation completed successfully.

[keeneyes]

to：jixingzhong(瞌睡虫·星辰)
难道是DWORD tag = MAKETABLENAME( 't','t','c','f');这句话有问题？
MAKETABLENAME宏的定义如下：
#define MAKETABLENAME(ch1, ch2, ch3, ch4) ((((DWORD)(ch4)) << 24) | (((DWORD)(ch3)) << 16) | (((DWORD)(ch2)) << 8) | ((DWORD)(ch1)))

[zfyccpp]

我也遇到了，
我代码的原因是LOGFONT的CHARSET没有设置正确。

[jacknes009]

study

[spofmy]

学习了