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Python _cffi_backend.buffer方法代码示例

本文整理汇总了Python中_cffi_backend.buffer方法的典型用法代码示例。如果您正苦于以下问题:Python _cffi_backend.buffer方法的具体用法?Python _cffi_backend.buffer怎么用?Python _cffi_backend.buffer使用的例子?那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在_cffi_backend的用法示例。


在下文中一共展示了_cffi_backend.buffer方法的5个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的Python代码示例。

示例1: from_buffer

# 需要导入模块: import _cffi_backend [as 别名]
# 或者: from _cffi_backend import buffer [as 别名]
def from_buffer(self, cdecl, python_buffer=_unspecified,
                    require_writable=False):
        """Return a cdata of the given type pointing to the data of the
        given Python object, which must support the buffer interface.
        Note that this is not meant to be used on the built-in types
        str or unicode (you can build 'char[]' arrays explicitly)
        but only on objects containing large quantities of raw data
        in some other format, like 'array.array' or numpy arrays.

        The first argument is optional and default to 'char[]'.
        """
        if python_buffer is _unspecified:
            cdecl, python_buffer = self.BCharA, cdecl
        elif isinstance(cdecl, basestring):
            cdecl = self._typeof(cdecl)
        return self._backend.from_buffer(cdecl, python_buffer,
                                         require_writable) 
开发者ID:tp4a,项目名称:teleport,代码行数:19,代码来源:api.py

示例2: unpack

# 需要导入模块: import _cffi_backend [as 别名]
# 或者: from _cffi_backend import buffer [as 别名]
def unpack(self, cdata, length):
        """Unpack an array of C data of the given length,
        returning a Python string/unicode/list.

        If 'cdata' is a pointer to 'char', returns a byte string.
        It does not stop at the first null.  This is equivalent to:
        ffi.buffer(cdata, length)[:]

        If 'cdata' is a pointer to 'wchar_t', returns a unicode string.
        'length' is measured in wchar_t's; it is not the size in bytes.

        If 'cdata' is a pointer to anything else, returns a list of
        'length' items.  This is a faster equivalent to:
        [cdata[i] for i in range(length)]
        """
        return self._backend.unpack(cdata, length)

   #def buffer(self, cdata, size=-1):
   #    """Return a read-write buffer object that references the raw C data
   #    pointed to by the given 'cdata'.  The 'cdata' must be a pointer or
   #    an array.  Can be passed to functions expecting a buffer, or directly
   #    manipulated with:
   #
   #        buf[:]          get a copy of it in a regular string, or
   #        buf[idx]        as a single character
   #        buf[:] = ...
   #        buf[idx] = ...  change the content
   #    """
   #    note that 'buffer' is a type, set on this instance by __init__ 
开发者ID:reBiocoder,项目名称:bioforum,代码行数:31,代码来源:api.py

示例3: from_buffer

# 需要导入模块: import _cffi_backend [as 别名]
# 或者: from _cffi_backend import buffer [as 别名]
def from_buffer(self, python_buffer):
        """Return a <cdata 'char[]'> that points to the data of the
        given Python object, which must support the buffer interface.
        Note that this is not meant to be used on the built-in types
        str or unicode (you can build 'char[]' arrays explicitly)
        but only on objects containing large quantities of raw data
        in some other format, like 'array.array' or numpy arrays.
        """
        return self._backend.from_buffer(self.BCharA, python_buffer) 
开发者ID:reBiocoder,项目名称:bioforum,代码行数:11,代码来源:api.py

示例4: memmove

# 需要导入模块: import _cffi_backend [as 别名]
# 或者: from _cffi_backend import buffer [as 别名]
def memmove(self, dest, src, n):
        """ffi.memmove(dest, src, n) copies n bytes of memory from src to dest.

        Like the C function memmove(), the memory areas may overlap;
        apart from that it behaves like the C function memcpy().

        'src' can be any cdata ptr or array, or any Python buffer object.
        'dest' can be any cdata ptr or array, or a writable Python buffer
        object.  The size to copy, 'n', is always measured in bytes.

        Unlike other methods, this one supports all Python buffer including
        byte strings and bytearrays---but it still does not support
        non-contiguous buffers.
        """
        return self._backend.memmove(dest, src, n) 
开发者ID:reBiocoder,项目名称:bioforum,代码行数:17,代码来源:api.py

示例5: ctarray_to_bytes

# 需要导入模块: import _cffi_backend [as 别名]
# 或者: from _cffi_backend import buffer [as 别名]
def ctarray_to_bytes(ctarray):
    """
    Convert ctypes array into a bytes object.

    :param ctarray: The ctypes array to convert.
    :return: The converted ctypes array.
    :rtype: bytes
    """
    if not len(ctarray):
        # work around a bug in v3.1 & v3.2 that results in a segfault when len(ctarray) == 0
        return bytes()
    bytes_ = buffer(ctarray) if sys.version_info[0] < 3 else bytes(ctarray)
    return bytes_[:] 
开发者ID:Josue87,项目名称:BoomER,代码行数:15,代码来源:utilities.py


注:本文中的_cffi_backend.buffer方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。