通过dbus传递大型数据结构 [英] Passing a large data structure over dbus

问题描述

我正在使用dbus交流两个程序。一个创建一个大图像，然后将其发送给其他程序进行进一步处理。我将图像作为ByteArray传递。

I'm using dbus to communicate two programs. One creates a large image and it later sends it other program for further processing. I'm passing the image as ByteArray.

对于2000x2000的图像，我的程序可以工作，但对于4000x4000的程序，其苛刻之处是：

With 2000x2000 images my program works, but with 4000x4000 it crasses with:

process 2283: arguments to dbus_message_iter_append_fixed_array() were       
incorrect,assertion "n_elements <= DBUS_MAXIMUM_ARRAY_LENGTH / _dbus_type_get_alignment  
(element_type)" failed in file dbus-message.c line 2628.

我知道这意味着我传递的数组大于允许的范围。还有其他在dbus中传递大数据结构的方法吗？

I understand that this means that I'm passing an array larger than allowed. Is there other way of passing large data strucutures in dbus?

这是我正在使用的代码的摘录：

This is an excerpt of the code I'm using:

handle = StringIO()
# hdulist contains the large data structure
hdulist.writeto(handle)
hdub = dbus.ByteArray(handle.getvalue())
# this sends the image via dbus
self.dbi.store_image(hdub)

发送图像

在另一端，我有类似

In the other end I have something like

def store_image(self, bindata):
    # Convert binary data back to HDUList
    handle = StringIO.StringIO(bindata)
    hdulist = pyfits.open(handle)

推荐答案

我认为Dbus并不是发送大量数据的最佳方法。

I don't think Dbus is really the best way to send large amounts of data.

如何将数据结构写到/ tmp中的文件中，而只是通过dbus在程序之间传递文件名？

How about writing the data structure out to a file in /tmp, and just passing the filename between the programs via dbus instead?

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