opencvCar | # # BeisheAndroid 是一个手机端的app # # Bishe 是电脑服务端程序 # # lanya | Wrapper library
kandi X-RAY | opencvCar Summary
kandi X-RAY | opencvCar Summary
##BeisheAndroid 是一个手机端的app ##Bishe 是电脑服务端程序 ##lanya 是stem32上运行的程序. 1.QT5.5 for Android (windows)版。. 2.Java Platform (JDK) 7u45 下载地址: 找到jdk-7u45-windows-i586.exe下载。. 下完安装。 安装会让你选择安装路径,希望使用默认的。安装完成你会发现在安装目录里有个2个文件夹。 注意我的安装目录为默认的c:\program files\java 接下来设置环境变量:我的电脑-系统属性-高级,中找到“环境变量”点击新建即可。注意变量值都是以分号为间隔的。 我们新建系统变量ClassPath,填入C:\Program Files\Java\jdk1.7.0_45\bin然后点确定。 同样方法再建立一个JAVA_HOME,值为C:\Program Files\Java\jdk1.7.0_45 然后确定。 再找到Path环境变量,加入qt的安装路径。如果这个变量值中有其他的值,要在我们添 加的路径前加个英文态分号哦!;D:\Qt\Qt5.2.0\5.2.0\mingw48_32\bin。如果没有别的值就不要加了 。我把qt for android版的qt安装在了D盘。. 3.adt-bundle-windows-x86-20131030(也就是安卓的JDK) 下载地址找到下图所示的标志,点击,接着会弹出一个页面,你点击同意后,选择32位的下载即可。 下载完成后是个压缩包,你需要解压。 我解压到了F盘,自己建立的android文件夹中了。你也可以跟我学,也在f盘建立一个andr oid文件夹。这样你就可以完全复制我的变量值了。F:\android\adt-bundle-windows-x86-2 0131030\sdk\tools填入PATH环境变量中。主要在路径前加个英文的分号哦。如下图 接着找到SDK Manager。exe运行。打开后,它会自动检查更新,时间不短。. 4.android-ndk-r9b-windows-x86 下载地址:下载解压。我还是在F盘的android文件夹里哦。 新建androidNDKHOST环境变量 值为F:\android\android-ndk-r9b-windows-x86\android-ndk-r9b. 打开android 版 QT 选择浏览进行路径的配置。然后点击启动Android AVD管理器。添加一个虚拟手机即可。接着等待一会会在列表中显示了。 我列表中显示的是名称1. 看看你的列表旁的添加按钮能不能用,如果能用,你直接点添加给个设备名字也行。 然后建立个android的项目。我建立的是QUICK项目建立过程中会让你选一个环镜。 接着就是运行了。点调试按钮。如果环境你选的不对,就会出现运行错误。在模拟器界面中找到你的项目名,图标为小安卓机器人。 点击它运行运行结果。.
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Trending Discussions on Wrapper
QUESTION
For pure educational and curiosity purposes, I am trying to create an element-wrapper object that allows me to tack-on my own properties and methods to an element. The behavior I'm trying to simulate is basically this:
...ANSWER
Answered 2022-Mar-31 at 21:53I haven't test this, but maybe something like this:
QUESTION
I'm trying to define a decorator in order to execute a class method, try it first and, if an error is detected, raise it mentioning the method in which failed, so as to the user could see in which method is the error.
Here I show a MRE (Minimal, Reproducible Example) of my code.
...ANSWER
Answered 2022-Feb-22 at 17:59For decorators with parameters, you need one more level of nesting:
QUESTION
I built a C++ shared library, that exports functions for constructing, destructing and interacting with an implemented class. I want to write a wrapper class in Python, which loads the compiled .dll and wraps all the functions as a class using ctypes
.
How do I wrap the destructor function of the C++ class safely so it will be called in any case (Normal Garbage Collection, Exceptions etc) ?
...ANSWER
Answered 2022-Feb-11 at 10:50As per Python's data model doc:
Objects are never explicitly destroyed; however, when they become unreachable they may be garbage-collected. An implementation is allowed to postpone garbage collection or omit it altogether...
...
Some objects contain references to “external” resources such as open files or windows. It is understood that these resources are freed when the object is garbage-collected, but since garbage collection is not guaranteed to happen, such objects also provide an explicit way to release the external resource, usually a close() method. Programs are strongly recommended to explicitly close such objects. The
try…finally
statement and thewith
statement provide convenient ways to do this.
So even if in most cases __del__
method of an object is being called by GC, it is not guaranteed. with
statement (from PEP 343) on the other hand guarantees that if __enter__
method of the object succeeded, then __exit__
method will be called at the end of the statement, both in case of normal execution and in case of exception. (More detailed in this question)
An example could be as below, with the usage of "object-closing" context manager from PEP 343 examples, and a wrapper class with close
method which calls native object's destructor:
QUESTION
I have functions that takes an integer as input and also output an integer. I need to write a decorator to wrap them.
The decorator will save a tuple with two numbers: the average of the inputs and the average of the outputs. For every call to that kind of function, the averages will be printed.
I'm not really sure about the way. I tried this, but it just returns the same input and output of the current function call, how can I calculate the average of all the inputs and outputs till now? or else how do I keep the args amount for the next call to decorator?
...ANSWER
Answered 2022-Jan-01 at 22:34from functools import wraps
def dec(func):
@wraps(func)
def wrap(*args):
wrap.counter += 1
wrap.sum_inputs += int(*args)
wrap.sum_outputs += func(*args)
avg_input = wrap.sum_inputs / wrap.counter
avg_output = wrap.sum_outputs / wrap.counter
print("Average of inputs ", avg_input)
print("Average of outputs ", avg_output)
return func(*args)
wrap.counter = 0
wrap.sum_inputs = 0
wrap.sum_outputs = 0
return wrap
QUESTION
My goal here is to wrap an API function so that the wrapper has the same arguments as the API function and then also has one additional final parameter. The API function is very generic so the wrapper needs to take the types and parameters from this inside function.
My reasoning is that I need to enhance the API function with additional optional arguments. For another developer using this wrapper function, it would be an awful experience to have this optional argument as the first argument.
My current attempt is as follows:
...ANSWER
Answered 2021-Dec-31 at 21:36In argument lists of functions the spread must come after other arguments. However, the same is not true for tuple types.
That means you could declare args
like:
QUESTION
I read about wrappers and would like to use it for plotting. I wanted to have a wrapper function that creates and saves figure in my plot functions. However I get the error shown below. Here is my code:
...ANSWER
Answered 2021-Dec-09 at 15:58I would just declare your fig
as an attribute to your plotting
class and just pass x
and y
to your wrapper.
See code below:
QUESTION
Why does the below code print error msg
instead of ABC\nerror msg
?
ANSWER
Answered 2021-Nov-25 at 12:47Forget the Exception class for now. Consider this:
QUESTION
I want to write a wrapper for calling CPU-demanding functions in asyncio.
I want it to be used like this:
...ANSWER
Answered 2021-Nov-17 at 14:54Maybe the original function and the wrapped one not having the same id is the problem?
In a way, yes. Before the function is sent to the target process it's pickled, which fails in your case, because the func
object in the decorator's scope is different from the fact
object in your main module, after rebinding by the decorator.
Look at this and this question for some background.
Based on these answers I created an example on how what you want can be achieved.
The trick is to create a picklable "runner" function, that the target process can use to look up your orginal function from some sort of registry (e.g. a dict...) and run it. This is of course just an example. You will probably not want to create your ProcessPoolExecutor
in the decorator.
QUESTION
I am attempting to port C code from one platform to another and remove dependencies.
There is a debug function called dbg_out
which prints out like printf()
.
The prototype is void dbg_out(int dbgMask, const char *pFormat, ...);
Here is an example call : dbg_out((5, "SerialDriver : (%04x-%08lx) \n", id, sn));
I would like to map this function to a normal printf()
call but having some issues.
I have attempted this so far
...ANSWER
Answered 2021-Oct-29 at 14:51You need use vprintf
instead, to be able to use unknown arguments
QUESTION
I'm recently reading some source code in cBLAS, and something make me unclear. In many functions, a .c file calls Fortran Wrapper instead of writing the codes directly in the C file, like the following file:
...ANSWER
Answered 2021-Oct-18 at 20:07"What I wanna ask is actually why there is a need for a intermediate wrapper, why not write it in C?"
The whole CBLAS is a wrapper to BLAS. BLAS is defined using a reference Fortran implementation and a Fortran API. BLAS can be implemented in C or assembly, but the API is set to be Fortran.
Therefore the CBLAS does not actually contain the whole functionality. The functionality is in whatever BLAS implementation you install. The very common reference implementation is written in Fortran, but it is not the fastest one.
However, you probably could call the sdsdot
function (in whichever language it is actually implemented) directly from C cblas_sdsdot
. The author of CBLAS chose to implement a Fortran intermediate subroutine sdsdotsub
. I do not have an answer why that is necessary right now. The difference is very small, really just changing a function to a subroutine.
As @jxh correctly comments, there is a larger risk of ABI incompatibility in calling a function vs calling a subroutine (similar to a void function).
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