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POCorrupted string as a result from a download of utf8 encoded xml data received by libcurl
 

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  1. POCorrupted string as a result from a download of utf8 encoded xml data received by libcurl
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    <p>In a project that implements an Amazon S3 access library with the use of libcurl, I have problems with UTF8. The method for listing a bucket's contents sends the appropriate request to the S3 server, correctly signed and all. I receive a xml document, but the data is corrupted.</p> <p>I save it into a std::string. For example, it starts with the following fragment:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;ListBucketResult </code></pre> <p>After the last "t" of "ListBucketResult", there is a "0" (zero) in the code, terminating the std::string. Viewing the contents of the string in the debugger or writing them into a file shows this, and many more zeros at different positions, e.g. at some (but not all) ">" closing brackets.</p> <p>I use MS Visual Studio 2008 running on WinXP, the project is compiled with unicode support.</p> <p>What should I do to receive proper UTF8 inside the std::string (which should be unicode agnostic, according to several sources)? Any hints on this one?</p> <pre><code>bool Http::Download(std::string&amp; url, std::string&amp; targetString, std::vector&lt;std::string&gt;* customHeaders) { CURLcode result = CURLE_FAILED_INIT; dl = true; if (curl) { curl = curl_easy_init(); curl_easy_setopt(curl, CURLOPT_URL, url.c_str()); curl_easy_setopt(curl, CURLOPT_HEADER, 0); curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1); curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteData); curl_easy_setopt(curl, CURLOPT_WRITEDATA, &amp;targetString); if (unsafe) { curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L); curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L); } if (customHeaders) { curl_slist* headers = 0; for (std::vector&lt;std::string&gt;::const_iterator iter = customHeaders-&gt;begin(); iter != customHeaders-&gt;end(); iter++) { headers = curl_slist_append(headers, (*iter).c_str()); headers = curl_slist_append(headers, "\n"); } curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); } result = curl_easy_perform(curl); long http_code = 0; curl_easy_getinfo (curl, CURLINFO_RESPONSE_CODE, &amp;http_code); lastHttpResult = static_cast&lt;int&gt;(http_code); curl_easy_cleanup(curl); } return (result == CURLE_OK); }; size_t Http::WriteData(char* data, size_t size, size_t nmemb, void* target) { if(target) { reinterpret_cast&lt;std::string*&gt;(target)-&gt;append(data); size_t len = size * nmemb; return len; } return 0; }; </code></pre>
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    1. USMartin
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    1. COPlease post your code.
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    2. COEdit: Added link to pastebin
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    3. COI thought it was too much and didn't want to clutter this thread. Simple politeness.
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      1. USMartin
 

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