#!/bin/env python
#-*- vim: set fileencoding=GBK
import os

mplayer=r"e:\tools\mplayer\mplayer.exe"
msg = "mms://202.120.58.191/movie6/1e01在水一方.wmv"
url = msg.decode("GB18030").encode("UTF-16-LE")
print type(url) # 
print type(msg) # 
os.execv(mplayer, (mplayer, url)) #TypeError: execv() arg 2 must contain
only strings
#如果换成:
os.execv(mplayer, (mplayer, msg)) #OKay!

请帮忙解释一下这里面的原因，是不是因unicode跟str的区别？可这两个的类型都是str。想了半天还是没有想明白
谢谢！

--
Best Regards

Shixin Zeng
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我想可能是因为你的系统缺省encoding不是UTF-16-LE，所以传递给shell的参数字符串无法正确解码。

2006/5/8, Shixin Zeng <zeng.shixin at gmail.com>:
> #!/bin/env python
> #-*- vim: set fileencoding=GBK
> import os
>
> mplayer=r"e:\tools\mplayer\mplayer.exe"
> msg = "mms://202.120.58.191/movie6/1e01在水一方.wmv"
> url = msg.decode("GB18030").encode("UTF-16-LE")
> print type(url) # 
> print type(msg) # 
> os.execv(mplayer, (mplayer, url)) #TypeError: execv() arg 2 must contain
> only strings
> #如果换成:
> os.execv(mplayer, (mplayer, msg)) #OKay!
>
> 请帮忙解释一下这里面的原因，是不是因unicode跟str的区别？可这两个的类型都是str。想了半天还是没有想明白
> 谢谢！

On 5/8/06, hal <sunchaojun at gmail.com> wrote:
>
> 我想可能是因为你的系统缺省encoding不是UTF-16-LE，所以传递给shell的参数字符串无法正确解码。


我现在的理解是：
UTF-16-LE的字符串中含有\x00字符，而这样的字符串不能做为exec*的参数。如果确实是这样的话，那么这个错误提示是有问题的。
我是根据file()的参数提示想到这个的。
如果将这个字符串做为文件名，会得到：
TypeError: file() argument 1 must be (encoded string without NULL bytes),
not str

2006/5/8, Shixin Zeng <zeng.shixin at gmail.com>:
> > #!/bin/env python
> > #-*- vim: set fileencoding=GBK
> > import os
> >
> > mplayer=r"e:\tools\mplayer\mplayer.exe"
> > msg = "mms://202.120.58.191/movie6/1e01在水一方.wmv"
> > url = msg.decode("GB18030").encode("UTF-16-LE")
> > print type(url) # 
> > print type(msg) # 
> > os.execv(mplayer, (mplayer, url)) #TypeError: execv() arg 2 must contain
> > only strings
> > #如果换成:
> > os.execv(mplayer, (mplayer, msg)) #OKay!
> >
> > 请帮忙解释一下这里面的原因，是不是因unicode跟str的区别？可这两个的类型都是str。想了半天还是没有想明白
> > 谢谢！
>
> _______________________________________________
> python-chinese
> Post: send python-chinese at lists.python.cn
> Subscribe: send subscribe to python-chinese-request at lists.python.cn
> Unsubscribe: send unsubscribe to  python-chinese-request at lists.python.cn
> Detail Info: http://python.cn/mailman/listinfo/python-chinese
>
>


--
Best Regards

Shixin Zeng
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url跟msg的内容不一样，你怎么会指望它们的结果是一致的呢？

On 5/8/06, Shixin Zeng <zeng.shixin at gmail.com> wrote:
>
> #!/bin/env python
> #-*- vim: set fileencoding=GBK
> import os
>
> mplayer=r"e:\tools\mplayer\mplayer.exe"
> msg = "mms://202.120.58.191/movie6/1e01在水一方.wmv"
> url = msg.decode("GB18030").encode("UTF-16-LE")
> print type(url) # 
> print type(msg) # 
> os.execv(mplayer, (mplayer, url)) #TypeError: execv() arg 2 must contain
> only strings
> #如果换成:
> os.execv(mplayer, (mplayer, msg)) #OKay!
>
> 请帮忙解释一下这里面的原因，是不是因unicode跟str的区别？可这两个的类型都是str。想了半天还是没有想明白
> 谢谢！
>
>
>
>

execv函数在posixdule.c中实现.其中有这么几句话:
  if (!PyArg_Parse((*getitem)(argv, i), "et",
     Py_FileSystemDefaultEncoding,
     &argvlist;[i])) {
   free_string_array(argvlist, i);
   PyErr_SetString(PyExc_TypeError,
     "execv() arg 2 must contain only strings");
   PyMem_Free(path);
   return NULL;

可见,问题并不在于你的url是个unicode,而在于,你的url的编码不是系统默认的编码


--
Best Regards,
Leo Jay
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On 5/8/06, Leo Jay <python.leojay at gmail.com> wrote:
>
> On 5/8/06, Shixin Zeng <zeng.shixin at gmail.com> wrote:
> >
> > #!/bin/env python
> > #-*- vim: set fileencoding=GBK
> > import os
> >
> > mplayer=r"e:\tools\mplayer\mplayer.exe"
> > msg = "mms://202.120.58.191/movie6/1e01在水一方.wmv"
> > url = msg.decode("GB18030").encode("UTF-16-LE")
> > print type(url) # 
> > print type(msg) # 
> > os.execv(mplayer, (mplayer, url)) #TypeError: execv() arg 2 must contain
> > only strings
> > #如果换成:
> > os.execv(mplayer, (mplayer, msg)) #OKay!
> >
> > 请帮忙解释一下这里面的原因，是不是因unicode跟str的区别？可这两个的类型都是str。想了半天还是没有想明白
> > 谢谢！
> >
> >
> >
> >
>
> execv函数在posixdule.c中实现.其中有这么几句话:
>   if (!PyArg_Parse((*getitem)(argv, i), "et",
>      Py_FileSystemDefaultEncoding,
>      &argvlist;[i])) {
>    free_string_array(argvlist, i);
>    PyErr_SetString(PyExc_TypeError,
>      "execv() arg 2 must contain only strings");
>    PyMem_Free(path);
>    return NULL;
>
> 可见,问题并不在于你的url是个unicode,而在于,你的url的编码不是系统默认的编码
>

谢谢！那看来这个错误提示还是有点误导。或许改为
exec() arg 2 must contain only strings encoded in system default encoding.
要更明确些。

--
> Best Regards,
> Leo Jay
>
> _______________________________________________
> python-chinese
> Post: send python-chinese at lists.python.cn
> Subscribe: send subscribe to python-chinese-request at lists.python.cn
> Unsubscribe: send unsubscribe to  python-chinese-request at lists.python.cn
> Detail Info: http://python.cn/mailman/listinfo/python-chinese
>
>


--
Best Regards

Shixin Zeng
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On 5/8/06, Leo Jay <python.leojay at gmail.com> wrote:
>
> On 5/8/06, Shixin Zeng <zeng.shixin at gmail.com> wrote:
> >
> > #!/bin/env python
> > #-*- vim: set fileencoding=GBK
> > import os
> >
> > mplayer=r"e:\tools\mplayer\mplayer.exe"
> > msg = "mms://202.120.58.191/movie6/1e01在水一方.wmv"
> > url = msg.decode("GB18030").encode("UTF-16-LE")
> > print type(url) # 
> > print type(msg) # 
> > os.execv(mplayer, (mplayer, url)) #TypeError: execv() arg 2 must contain
> > only strings
> > #如果换成:
> > os.execv(mplayer, (mplayer, msg)) #OKay!
> >
> > 请帮忙解释一下这里面的原因，是不是因unicode跟str的区别？可这两个的类型都是str。想了半天还是没有想明白
> > 谢谢！
> >
> >
> >
> >
>
> execv函数在posixdule.c中实现.其中有这么几句话:
>   if (!PyArg_Parse((*getitem)(argv, i), "et",
>      Py_FileSystemDefaultEncoding,
>      &argvlist;[i])) {
>    free_string_array(argvlist, i);
>    PyErr_SetString(PyExc_TypeError,
>      "execv() arg 2 must contain only strings");
>    PyMem_Free(path);
>    return NULL;
>
> 可见,问题并不在于你的url是个unicode,而在于,你的url的编码不是系统默认的编码
>

又考虑了一下这个问题
1)将它改成UTF-8编码 url = msg.decode("GB18030").encode("UTF-8")，能运行
2)改成Big5，也能运行

3)sys.getfilesystemencoding()返回"mbcs"，不知道这个究竟是什么编码？

4)查阅了PyArg_Parse的参数说明，说到"et"时，跟"es"类似,"es"有这么一段话：
This variant on "s" is used for encoding Unicode and objects convertible to
Unicode into a character buffer. It only works for encoded data without
embedded NUL bytes.
这明确说明了不能有内嵌的NUL即\x00字符，但是没有说明当指定的encoding无法编码所给定的字符串时的行为，所以不能断定是因为编码不对的问题。
5) msg = "mms://202.120.58.191/movie6/1e01\x00在水一方.wmv"
    os.execv(mplayer,(mplayer, msg)也将抛出异常
6) msg = "mms://202.120.58.191/movie6/1e01\xff\xf1在水一方.wmv"
#插入'GB18030'中都没有编码的字符(串)
   os.execv(mplayer, (mplayer, msg))没有异常产生。

从上面可以看出，异常的抛出不在于它不是系统默认的编码，而是内嵌了\x00字符。

> --
> Best Regards,
> Leo Jay
>
> _______________________________________________
> python-chinese
> Post: send python-chinese at lists.python.cn
> Subscribe: send subscribe to python-chinese-request at lists.python.cn
> Unsubscribe: send unsubscribe to  python-chinese-request at lists.python.cn
> Detail Info: http://python.cn/mailman/listinfo/python-chinese
>
>


--
Best Regards

Shixin Zeng
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>
>   又考虑了一下这个问题
> > 1)将它改成UTF-8编码 url = msg.decode("GB18030").encode("UTF-8")，能运行
> > 2)改成Big5，也能运行
> >
> > 3)sys.getfilesystemencoding()返回"mbcs"，不知道这个究竟是什么编码？
> >
> > 4)查阅了PyArg_Parse的参数说明，说到"et"时，跟"es"类似,"es"有这么一段话：
> > This variant on "s" is used for encoding Unicode and objects convertible
> > to Unicode into a character buffer. It only works for encoded data without
> > embedded NUL bytes.
> >
> > 这明确说明了不能有内嵌的NUL即\x00字符，但是没有说明当指定的encoding无法编码所给定的字符串时的行为，所以不能断定是因为编码不对的问题。
> > 5) msg = "mms://202.120.58.191/movie6/1e01\x00在水一方.wmv"
> >     os.execv(mplayer,(mplayer, msg)也将抛出异常
> > 6) msg = "mms://202.120.58.191/movie6/1e01\xff\xf1在水一方.wmv"
> > #插入'GB18030'中都没有编码的字符(串)
> >    os.execv(mplayer, (mplayer, msg))没有异常产生。
> >
> > 从上面可以看出，异常的抛出不在于它不是系统默认的编码，而是内嵌了\x00字符。
> >
> >
>   --
> > Best Regards,
> > Leo Jay
> >
> > _______________________________________________
> > python-chinese
> > Post: send python-chinese at lists.python.cn
> > Subscribe: send subscribe to python-chinese-request at lists.python.cn
> > Unsubscribe: send unsubscribe to
> > python-chinese-request at lists.python.cn
> > Detail Info: http://python.cn/mailman/listinfo/python-chinese
> >
> >
>
>
> --
> Best Regards
>
>
> Shixin Zeng
>
> _______________________________________________
> python-chinese
> Post: send python-chinese at lists.python.cn
> Subscribe: send subscribe to python-chinese-request at lists.python.cn
> Unsubscribe: send unsubscribe to  python-chinese-request at lists.python.cn
> Detail Info: http://python.cn/mailman/listinfo/python-chinese



我也比较认同你的说法! 应该是其中包含了'\x00'的原因
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