需要帮助将java转换为c ++ [英] need help converting java to c++
问题描述
你好，
i有一个java应用程序，用于构建特定文件格式的xml
，反之亦然。
我已经被要求将其转换为c ++，但我不是c ++的专家，
实际上我只是初学者你可以说。
i虽然有几个问题：
1-是否有任何等同于java'的流
类（ByteArrayInputStream，InputStreamRedare，Dat aInputStream ..）
2-如何打开一个在c ++中的字节（char）数组上流，以便
将其作为文本读取。我有一个字节数组，我需要从中删除一些字节
然后将其传递给文本流。
3-我知道字符串以''\结尾0''c ++中的空字符。
fil我要解析，xml-to-be-elements用''\0''分隔，怎么可以
i将读取的文本拆分为字符串，使用''\0''作为我的分隔符，而不是让b / b混淆c ++。
4-最重要的：如何解析和用c ++构造xml，
那里有api for which以及在哪里找到它？
5-最后一个坚果不是最不重要的，因为我的目标是Windows，它会是什么？ />
更好地使用非托管Visual C ++。它是否有类型我需要b $ b寻找，并且它能否轻松完成任务？
哦，我使用g ++ for windows。
谢谢
问候
hello,
i have a java app that constructs an xml from a specific file format
and vice versa.
i''ve been asked to convert it to c++, but im not an expert in c++,
actually im mere beginner you can say.
i got a couple of questions though:
1- is there any equivalent to java''s Stream
classes(ByteArrayInputStream,InputStreamRedare,Dat aInputStream ..)
2- how to open a stream on a byte ( char) array in c++ in order to
read it as text. i have a byte array i need to strip off some bytes
from and then pass it to a text stream.
3- i know strings are ended in ''\0'' the null character in c++.in the
fil i want to parse, xml-to-be-elements are separated by ''\0'', how can
i split the read text into strings using ''\0'' as my delimiter without
confusing c++.
4- the most important : how to parse and construct xml in c++, is
there any api for that and where to find it?
5- last nut not least , since im targetting Windows , would it be
better to use unmanaged Visual C++ . does it have the types i am
looking for,and does it make it easy to accomplish the task ?
oh and i use g++ for windows.
Thanks
regards
推荐答案
2月13日12:17，史蒂文宏基" < dudest ... @ gmail.comwrote：
On 13 Feb., 12:17, "steven acer" <dudest...@gmail.comwrote:
hello，
i有一个java应用程序，它从特定的文件格式构造一个xml
反之亦然。
我被要求将其转换为c ++，但我不是c ++专家，
其实我是你可以说只是初学者。
hello,
i have a java app that constructs an xml from a specific file format
and vice versa.
i''ve been asked to convert it to c++, but im not an expert in c++,
actually im mere beginner you can say.
我不确定这是一个公平的第一工作。
I am not sure that is a fair "first" job.
i虽然有几个问题：
1-有没有相当于java'的流
类（ByteArrayInputStream，InputStreamRedare，Dat aInputStream ..）
i got a couple of questions though:
1- is there any equivalent to java''s Stream
classes(ByteArrayInputStream,InputStreamRedare,Dat aInputStream ..)
是。对于格式化的IO，您可能需要std :: ofstream。对于
unformatted / binary，你可以使用streambuffer或C文件
iosystem。你最好研究一下。
Yes. For formatted IO you probably need an std::ofstream. For
unformatted/binary, you could use a streambuffer or the C file
iosystem. You better study that.
2-如何在c ++中打开字节（char）数组上的流，以便
读取它作为文字。我有一个字节数组，我需要从中删除一些字节
然后将其传递给文本流。
2- how to open a stream on a byte ( char) array in c++ in order to
read it as text. i have a byte array i need to strip off some bytes
from and then pass it to a text stream.
您应该阅读文档，并在此处的
问题中更具体。这并不困难，但如果没有更多的知识，我们就无法回答。
You should read the documentation and be more specific in your
question here. It''s not difficult, but we can''t answer without more
knowledge of your problem.
3-我知道字符串在''\ 0'中以c ++中的空字符结尾。
3- i know strings are ended in ''\0'' the null character in c++.
实际上这是假的。 C字符串以null结尾，C ++字符串
不是。
That is false, actually. C strings are null-terminated, C++ strings
are not.
我希望解析
fil，xml-to-be-elements由''\0''分隔，如何使用''\ 0''作为我的分隔符将读取的文本拆分为字符串，而不会使用b ++混淆c / b
。
in the
fil i want to parse, xml-to-be-elements are separated by ''\0'', how can
i split the read text into strings using ''\0'' as my delimiter without
confusing c++.
这又取决于你的要求。
This again depends on your requirements.
4-最重要的：如何解析和构建在c ++中的xml是
那里有api for which以及在哪里找到它？
4- the most important : how to parse and construct xml in c++, is
there any api for that and where to find it?
C ++有几个不错的xml解析器。一个简短的谷歌应该给你一个候选人
。选择一个可能更多是一个政治决定
由贵公司制作。
There are several nice xml-parsers for C++. A short google should give
you a candidate. Choosing one probably is more of a political decision
to be made by your company.
5-最后一个坚果不是最小的，因为我的目标Windows，使用非托管Visual C ++会更好吗？
。它是否有类型我要求b $ b寻找，并且它能否轻松完成任务？
哦，我使用g ++ for windows。
5- last nut not least , since im targetting Windows , would it be
better to use unmanaged Visual C++ . does it have the types i am
looking for,and does it make it easy to accomplish the task ?
oh and i use g++ for windows.
只有一个C ++ - 即我们在这个
新闻组中讨论的语言。微软已经创建了一种新语言，它可以用于某些原因调用托管C ++，但它不是C ++。 托管C ++可能
可能是编程的好语言，但它不能用于移植到C ++的
。
/ Peter
There is only one C++ - namely the language we discuss in this
newsgroup. Microsoft has created a new language which they for some
reason call "managed C++", but it is not C++. "Managed C++" might
likely be a fine language for programming, but it can''t be used for
porting to C++.
/Peter
On Tue，2007年2月13日04:00:26 -0800，peter koch写道：
On Tue, 13 Feb 2007 04:00:26 -0800, peter koch wrote:
2月13日12:17，steven acer写道：
On 13 Feb., 12:17, "steven acer" wrote:
> hello，
我有一个java应用程序，它从特定的文件格式构建一个xml，反之亦然。
实际上我只是初学者，你可以说。
>hello,
i have a java app that constructs an xml from a specific file format
and vice versa.
i''ve been asked to convert it to c++, but im not an expert in c++,
actually im mere beginner you can say.
我不确定这是一个公平的第一工作。
I am not sure that is a fair "first" job.
>我有几个问题：
1-是否有任何等同于java'的Stream
类（ByteArrayInputStream， InputStreamRedare，Da taInputStream ..）
>i got a couple of questions though:
1- is there any equivalent to java''s Stream
classes(ByteArrayInputStream,InputStreamRedare,Da taInputStream ..)
是的。对于格式化的IO，您可能需要std :: ofstream。
Yes. For formatted IO you probably need an std::ofstream.
（你的意思是std :: ifstream吗？）
(did you mean std::ifstream ?)
对于无格式/二进制，你可以使用streambuffer或C文件
iosystem。你最好研究一下。
For unformatted/binary, you could use a streambuffer or the C file
iosystem. You better study that.
更容易使用其中一个std :: ifstream :: get（）函数，或者更好
std :: ifstream :: read （）;但您可能不需要使用未格式化的输入 - 请参阅
以下。
Easier to use one of the std::ifstream::get() functions, or better
std::ifstream::read(); but you may not need to use unformatted input - see
below.
> 2- how在c ++中打开字节（char）数组上的流，以便将其作为文本读取。我有一个字节数组，我需要从中删除一些字节，然后将其传递给文本流。
>2- how to open a stream on a byte ( char) array in c++ in order to
read it as text. i have a byte array i need to strip off some bytes
from and then pass it to a text stream.
您应该阅读文档，并在此处的
问题中更具体。这并不困难，但如果没有更多的知识，我们就无法回答。
You should read the documentation and be more specific in your
question here. It''s not difficult, but we can''t answer without more
knowledge of your problem.
> 3- i知道字符串以''\ 0''结尾于c ++中的空字符。
>3- i know strings are ended in ''\0'' the null character in c++.
实际上这是假的。 C字符串以null结尾，C ++字符串
不是。
That is false, actually. C strings are null-terminated, C++ strings
are not.
更确切地说：C ++字符串类std :: string可能不是使用以null结尾的字符数组实现的
（标准没有
需要这个。）
To be more precise: the C++ string class std::string is probably not
implemented using null-terminated character arrays (the standard does not
require this).
>在
fil我想要解析，xml-to-be-elements由''\ 0'分隔，怎么可以把读取文本分成字符串使用''\ 0''作为我的分隔符而不会混淆C ++。
>in the
fil i want to parse, xml-to-be-elements are separated by ''\0'', how can
i split the read text into strings using ''\0'' as my delimiter without
confusing c++.
也许您可以使用std :: getline（）指定''\0''作为分隔符来阅读
你的xml元素直接进入std :: string'。你不会混淆C ++那种方式，你不必乱用内存管理，你的
元素最终会得到很好的C ++风格的字符串。
/.../
-
Lionel B
Perhaps you could use std::getline() specifying ''\0'' as delimiter to read
your xml elements straight into std::string''s. You won''t confuse C++ that
way, you won''t have to mess around with memory management and your
elements end up in nice C++-style strings.
/.../
--
Lionel B
2月13日13:48，Lionel B< m ... @ privacy.netwrote：
On 13 Feb., 13:48, Lionel B <m...@privacy.netwrote:
2007年2月13日星期二04:00:26 - 0800，peter koch写道：
On Tue, 13 Feb 2007 04:00:26 -0800, peter koch wrote:
2月13日12:17，steven acer写道：
On 13 Feb., 12:17, "steven acer" wrote:
[snip]
[snip]
是。对于格式化的IO，您可能需要std :: ofstream。
Yes. For formatted IO you probably need an std::ofstream.
（你的意思是std :: ifstream？）
(did you mean std::ifstream ?)
是的。
Yup.
>
>
对于未格式化/二进制，您可以使用streambuffer或C文件
iosystem。你最好研究一下。
For unformatted/binary, you could use a streambuffer or the C file
iosystem. You better study that.
更容易使用其中一个std :: ifstream :: get（）函数，或者更好
std :: ifstream :: read （）;但您可能不需要使用未格式化的输入 - 请参阅下面的
。
Easier to use one of the std::ifstream::get() functions, or better
std::ifstream::read(); but you may not need to use unformatted input - see
below.
什么是更容易要看。我在C ++中使用二进制IO的经验已经是一个分层的C文件io，用于简单的IO作业，因为OP具有
或者转向金属。对于具有高性能要求的IO（或者说b
大文件：据我所知，MSVC仍然只支持文件的IO
到2GB）。
[snip]
What is "easier" depends. My experience with binary IO in C++ has
either been a layered above C file io for simple IO jobs as the OP has
or going "to the metal" for IO with high performance requirements (or
large files: so far as I know MSVC still only supports IO for files up
to 2GB).
[snip]
3-我知道字符串以''\0结尾''是c ++中的空字符。
3- i know strings are ended in ''\0'' the null character in c++.
实际上这是假的。 C字符串以null结尾，C ++字符串
不是。
That is false, actually. C strings are null-terminated, C++ strings
are not.
更确切地说：C ++字符串类std :: string可能不是使用以null结尾的字符数组实现的
（标准没有
要求这个）。
To be more precise: the C++ string class std::string is probably not
implemented using null-terminated character arrays (the standard does not
require this).
该标准允许嵌入空值并且还有其他要求
禁止std :: string实现为以null结尾的
string。
[snip]
/ Peter
The standard allows embedded nulls and also has other requirements
that forbids std::string to be implemented as a null-terminated
string.
[snip]
/Peter
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