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POHow to upload image from buffer with curl?
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  1. POHow to upload image from buffer with curl?
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    copied!<p>I'm succesfully capturing frames with software described in <a href="http://thinkrpi.wordpress.com/2013/05/22/opencvpi-cam-step-6-video/" rel="nofollow">Pierre Raufast blog</a>. I tried to upload image buffer using IplImage structures or raw buffer (please look at <code>buffer</code> and <code>dstImage</code> in <code>video_buffer_callback</code> function in this <a href="http://raufast.org/download/camcv_vid0.c" rel="nofollow">source code</a>). I'm using modified code from libcurl <a href="http://curl.haxx.se/libcurl/c/postit2.html" rel="nofollow">example</a>.</p> <pre><code>cvMatBuff = cvEncodeImage(".jpg", py, 0); /* Fill in the file upload field from buffer */ curl_formadd(&amp;formpost, &amp;lastptr, CURLFORM_COPYNAME, "file", CURLFORM_BUFFER, "nowy.jpg", CURLFORM_BUFFERPTR, cvMatBuff, CURLFORM_END); curl = curl_easy_init(); </code></pre> <p>Unfortunately after execution I'm getting 500 error from my flask application.</p> <pre><code>192.168.0.16 - - [17/Nov/2013 21:02:22] "POST /faces HTTP/1.1" 500 - ---------------------------------------- Exception happened during processing of request from ('192.168.0.16', 48537) Traceback (most recent call last): File "/usr/lib/python2.7/SocketServer.py", line 295, in _handle_request_noblock self.process_request(request, client_address) File "/usr/lib/python2.7/SocketServer.py", line 321, in process_request self.finish_request(request, client_address) File "/usr/lib/python2.7/SocketServer.py", line 334, in finish_request self.RequestHandlerClass(request, client_address, self) File "/usr/lib/python2.7/SocketServer.py", line 649, in __init__ self.handle() File "/home/usr/flask/lib/python2.7/site-packages/werkzeug/serving.py", line 200, in handle rv = BaseHTTPRequestHandler.handle(self) File "/usr/lib/python2.7/BaseHTTPServer.py", line 340, in handle self.handle_one_request() File "/home/usr/flask/lib/python2.7/site-packages/werkzeug/serving.py", line 235, in handle_one_request return self.run_wsgi() File "/home/usr/flask/lib/python2.7/site-packages/werkzeug/serving.py", line 194, in run_wsgi traceback.plaintext) File "/home/usr/flask/lib/python2.7/site-packages/werkzeug/utils.py", line 71, in __get__ value = self.func(obj) File "/home/usr/flask/lib/python2.7/site-packages/werkzeug/debug/tbtools.py", line 359, in plaintext return u'\n'.join(self.generate_plaintext_traceback()) File "/home/usr/flask/lib/python2.7/site-packages/werkzeug/debug/tbtools.py", line 353, in generate_plaintext_traceback frame.function_name UnicodeDecodeError: 'ascii' codec can't decode byte 0xc5 in position 17: ordinal not in range(128) </code></pre> <p>My server side code works fine when I'm uploading image from file by:</p> <pre><code>curl -F "file=@./medium.jpg" http://localhost:5000/faces </code></pre>
 

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