我正在编写一个应用程序,其结果是pdf文件,其中包含一些带有unicode字符的文本。在GAE devserver上它运行良好,但在部署后它无法导入字体文件(在add_font()(pyfpdf)之后崩溃)。
代码是:
# -*- coding: utf-8 -*-
def fun1():
from gluon.contrib.pyfpdf import FPDF, HTMLMixin
class MyFPDF(FPDF, HTMLMixin):
pass
pdf =MyFPDF()
pdf.add_font('DejaVu', '', 'DejaVuSansCondensed.ttf', uni=True)
pdf.add_page()
pdf.set_font('DejaVu','',16)
pdf.write(10,'test-ąśł')
response.headers['Content-Type']='application/pdf'
return pdf.output(dest='S')
字体文件(首次在web2py服务器上运行后生成DejaVuSansCondensed.pkl文件...)是/ gluon / contrib / fpdf / font。我没有添加任何东西到routers.py(我使用基于模式的系统)也app.yaml没有改变。我明白了:
In FILE: /base/data/home/apps/s~myapp/web2py-04.369240954601780983/applications/app3/controllers/default.py
Traceback (most recent call last):
File "/base/data/home/apps/s~myapp/web2py-04.369240954601780983/gluon/restricted.py", line 212, in restricted
exec ccode in environment
File "/base/data/home/apps/s~myapp/web2py-04.369240954601780983/applications/app3/controllers/default.py", line 674, in <module>
File "/base/data/home/apps/s~myapp/web2py-04.369240954601780983/gluon/globals.py", line 194, in <lambda>
self._caller = lambda f: f()
File "/base/data/home/apps/s~myapp/web2py-04.369240954601780983/applications/app3/controllers/default.py", line 493, in fun1
pdf.add_font('DejaVu', '', 'DejaVuSansCondensed.ttf', uni=True)
File "/base/data/home/apps/s~myapp/web2py-04.369240954601780983/gluon/contrib/fpdf/fpdf.py", line 432, in add_font
font_dict = pickle.load(fh)
File "/base/data/home/runtimes/python27p/python27_dist/lib/python2.7/pickle.py", line 1378, in load
return Unpickler(file).load()
File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/pickle.py", line 858, in load
dispatch[key](self)
File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/pickle.py", line 966, in load_string
raise ValueError, "insecure string pickle"
ValueError: insecure string pickle
正如我在当地(web2py / rocket和gae)所说,它运作良好。部署后,只有这样的工作:
pdf =MyFPDF()
pdf.add_page()
pdf.set_font('Arial','',16)
pdf.write(10,'testąśł')
但没有“不寻常”的角色......
最好的解决方案是添加我的字体文件(如DejaVu),但基本上我需要任何字体的unicode字符...也许是一些“半解决方案”使用“通用GAE unicode”字体...如果它存在这样的事情......
答案 0 :(得分:0)
感谢Tim的建议!
我发现some solution ......这不是最好的,但它有效......
问题在于使用GAE上的pickle。最好的解决方案(可能)是重载/重写add_font()
函数,GAE以这种方式写入数据存储区而不是文件系统。仍然会出现Additionaly ValueError: insecure string pickle
错误,我根据this尝试了b64编码。但我仍然得到错误。所以我的解决方案是使用注释掉/删除的部分重载add_font()
函数:
if os.path.exists(unifilename):
fh = open(unifilename)
try:
font_dict = pickle.load(fh)
finally:
fh.close()
else:
和
try:
fh = open(unifilename, "w")
pickle.dump(font_dict, fh)
fh.close()
except IOError, e:
if not e.errno == errno.EACCES:
raise # Not a permission error.
因此,这个函数每次都计算得更多,而不仅仅是从泡菜中读取数据......但它适用于GAE。