symbols

问题 I made a program which make a HUD over a video, getting info from sensors and plotting the results on the video frames, refreshing every frame, and for representing degrees (inclination) I need to plot a degree symbol, but what I get it's 2 symbols ("??") in the video show. I search through this site and others too. I can't do it!!!! please, I don't know what to do, it's just that little thing that I can't do it. This is the beginning of my program: import cv2 from random import * import

问题 i'm looking in a way to make a really basic wysiwyg such as when a user lick the button, it insert the symbol ♂ ( ♂) It is working but there is two problem : 1 - Only the unicode characters are inserted, they are not converted into symbol ( ♂) 2- If you have time, is there a simple way to insert the symbol where the "text cursor"is and not at the end of the content of the textarea ? Thanks for your help http://jsfiddle.net/cdjEr/3/ 回答1: ♂ is an HTML escape code. It is only processed in HTML

问题 I'm trying to compile my app through Xcode, everything has always worked, but suddenly today I return this error that makes the build fail. I attach the complete log of the error. Thanks for your help. Undefined symbols for architecture arm64: "_chkstk_darwin", referenced from: PTArchiveWriter::write(std::1::basic_string<char, std::1::char_traits<char>, std::1::allocator<char> > const&, std::1::basic_istream<char, std::1::char_traits<char> >&, std::1::basic_string<char, std::1::char_traits

问题 I'm trying to compile my app through Xcode, everything has always worked, but suddenly today I return this error that makes the build fail. I attach the complete log of the error. Thanks for your help. Undefined symbols for architecture arm64: "_chkstk_darwin", referenced from: PTArchiveWriter::write(std::1::basic_string<char, std::1::char_traits<char>, std::1::allocator<char> > const&, std::1::basic_istream<char, std::1::char_traits<char> >&, std::1::basic_string<char, std::1::char_traits

问题 Given these two evals which only change Module::FOO() and FOO() . # Symbols imported, and used locally. eval qq[ package Foo$num; Module->import(); my \$result = Module::FOO() * Module::FOO(); ] or die $@; # Symbols imported, not used locally referencing parent symbol. eval qq[ package Foo$num; Module->import(); my \$result = FOO() * FOO(); ] or die $@; why would the top block take up substantially less space? The script and output are reproduced below, Script package Module { use v5.30; use

问题 Given these two evals which only change Module::FOO() and FOO() . # Symbols imported, and used locally. eval qq[ package Foo$num; Module->import(); my \$result = Module::FOO() * Module::FOO(); ] or die $@; # Symbols imported, not used locally referencing parent symbol. eval qq[ package Foo$num; Module->import(); my \$result = FOO() * FOO(); ] or die $@; why would the top block take up substantially less space? The script and output are reproduced below, Script package Module { use v5.30; use

问题 I'm wondering if there is a standard way, if we are pronouncing typographical symbols out loud, for reading the << and >> symbols? This comes up for me when teaching first-time C++ students and discussing/fixing exactly what symbols need to be written in particular places. The best answer should not be names such as "bitwise shift" or "insertion", because those refer to more specific C++ operators, as opposed to the context-free symbol itself (which is what we want here). In that sense, this

问题 I'm working on a cross-platform c++/qt project with a plugin system, we are using so files on linux and dll on windows. We are using gcc on Linux and Visual Studio 2010 on Windows through cmake. The problem is our plugins sometimes need to call a function from the application source code, which is working fine on Linux with gcc by just including the header files. But on Visual Studio, we got unresolved external symbol errors. Is it because so and dll files works differently? thank you. 回答1:

问题 I think about switching to DB access library that uses DSN connection - connect("mysql://login:password@database?options"). DSN uses @ as a separator. Does it mean that the password cannot contain @ symbol? Is there other restrictions? 回答1: Any special characters can be tricky with DSNs, particularly if the language / platform escaping or special character rules decide to intervene. For Pear style DSNs, which I suppose you are using, it should be safe to use URL encoding to protect special

问题 I am quite experienced with Python, but recently, when I was looking at the solutions for the codility sample tests I encountered the operators -= , += , ^= and I am unable to figure out what they do. Perhaps could anyone explain the context in which they are used? 回答1: As almost any modern language, python has Assignment Operators so they can use them every time you want to assign a value to a variable after doing some arithmetic or logical operation, both (assignment and operation)are