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[Discuss-gnuradio] About gr.buffer

From: Zhonghua
Subject: [Discuss-gnuradio] About gr.buffer
Date: Thu, 22 Sep 2011 16:11:21 +0200
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110831 Thunderbird/3.1.13

Hi every one,
Now I am trying to use gr.buffer. I wrote some very simple codes to test how to use gr.buffer correctly. The main codes are as below: self.u=gr.sig_source_c(1e4,gr.GR_SIN_WAVE,1e3,1) #to create a sin source self.buf=gr.buffer(1000,gr.sizeof_gr_complex,self.u) #create a buffer by applying gr.buffer
self.connect(self.buf,self.csink) #send buffer volume to the sink

But unfortunately, I got a despondent error reply says: in method 'buffer', argument 3 of type 'gr_block_sptr'. I looked up the gr_buffer class and found that the so called argument 3 is a link to a block which writes data to this buffer. As my understanding, the sig_source block should write data to the buffer so I write self.buf as above way. From the error hint, I ever thought perhaps the error just comes from the incorrect type. Because the sin_source object is pointed by the pointer type of "gr_sin_source_c_sptr". But how can I get an object that merely inherited from gr.block class? I tried to construct a class inherits from gr.block but there exists another error says that "'module' object has no attribute 'block' ". I checked the internet but found nothing helpful. A surprising fact is that looks no one ever used gr.buffer in gnuradio by adopting python way. Is there anybody know how to use it correctly?
Your instruction is fairly appreciated.


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