DirectWrite: CreateFontFaceFromHDC() failed

[hjroyal]

1. Environment :

• OS: [Windows11]
• backend: [PyQt5 5.11.5]
• magicgui version [0.8.3]
• python 3.11.5

2. Problem: I followed the tutorial on the official website and tried to run the following example code to get an error.

DirectWrite: CreateFontFaceFromHDC() failed (指示输入文件 (例如字体文件) 中的错误。) for QFontDef(Family="MS Sans Serif", pointsize=12, pixelsize=16, styleHint=5, weight=400, stretch=100, hintingPreference=0) LOGFONT("MS Sans Serif", lfWidth=0, lfHeight=-16) dpi=96

# test.py

import matplotlib.pyplot as plt
import numpy as np
from matplotlib.backends.backend_qt5agg import FigureCanvas

from magicgui import magicgui

x = np.linspace(0, 5, 256)
y = np.linspace(0, 5, 256)[:, np.newaxis]
data = np.sin(x) ** 10 + np.cos(10 + y * x) * np.cos(x)

mpl_fig = plt.figure()
ax = mpl_fig.add_subplot(111)
(line,) = ax.plot(data[123])  # linescan through the middle of the image


@magicgui(position={"widget_type": "Slider", "max": 255}, auto_call=True)
def f(position: int):
    """Function demonstrating magicgui combined with matplotlib."""
    line.set_ydata(data[position])
    line.figure.canvas.draw()


# rather than using the Container.append (`f.append`) ...
# grab the native layout and add the QWidget to it
f.native.layout().addWidget(FigureCanvas(mpl_fig))

f.show(run=True)

3. Actions: pip install magicgui pip install PyQt5 run test.py

[tlambert03]

hi @hjroyal, it's hard to tell what this issue is. is this a bug report? if so, please tell me what code you ran to get this error, and if that DirectWrite line is an exception you received, please give the full traceback

[hjroyal]

Yes. Thank you for your reply. I updated my question and I guess it's a Windows 11 problem.

[tlambert03]

thank you. Ultimately, this is likely to be a broader Qt problem for you, and not a magicgui issue. However, if you can give me the full error message, including the traceback (i.e. NOT just the bit including DirectWrite: CreateFontFaceFromHDC() ... but rather the entire error message, including file names and line numbers) I might be help a bit more

[hanjinliu]

@hjroyal I think it's a windows x Qt issue. It's not an error but a log output by Qt at C++ level.

[tlambert03]

It's not an error but a log output by Qt at C++ level.

ahh, is that true @hjroyal? Does the example otherwise work? You're just seeing this printed to your console?

[yinsel]

It's not an error but a log output by Qt at C++ level.

ahh, is that true @hjroyal? Does the example otherwise work? You're just seeing this printed to your console?

How to block this output, otherwise the application will become unsightly

[tlambert03]

How to block this output, otherwise the application will become unsightly

I'm not entirely sure, and it's hard to test because I can't reproduce it. But this is ultimately a Qt issue, and not a magicgui issue. So, if Qt is unable to fonts somehow in your system you would need to solve this at a lower level. The most useful thing you could do is reduce this to a bare minimum example, so we can determine what exactly is calling CreateFontFaceFromHDC ... it's not magicgui. it might be matplotlib? it might be lower down in Qt C++ layer?

[yinsel]

如何阻止此输出，否则应用程序将变得难看

我不完全确定，而且很难测试，因为我无法重现它。但这最终是一个 Qt 问题，而不是一个 magicgui 问题。因此，如果 Qt 无法以某种方式在您的系统中使用字体，您将需要在较低级别解决这个问题。你能做的最有用的事情是将其简化为一个最少的示例，这样我们就可以确定到底是什么在调用 ...它不是 magicgui。可能是 matplotlib？它可能在 Qt C++ 层的较低位置？CreateFontFaceFromHDC

No, I am using the simplest example in the document

[tlambert03]

i'm sorry I can't read that. can you please paste the exact code you're running, and the exact output you're seeing?