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<li class="navelem"><a class="el" href="dir_68267d1309a1af8e8297ef4c3efbcdba.html">src</a></li> </ul>
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<div class="title">error.cpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com></span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// This file is part of the "winapi-common" project.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// For details, see https://github.com/egor-tensin/winapi-common.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// Distributed under the MIT License.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>  </div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include <<a class="code" href="error_8hpp.html">winapi/error.hpp</a>></span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include <winapi/utf8.hpp></span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  </div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <windows.h></span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  </div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <cstdint></span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <sstream></span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <string></span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <system_error></span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  </div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">namespace </span>winapi {</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">namespace </span>error {</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">namespace </span>{</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> std::wstring trim_trailing_newline(<span class="keyword">const</span> std::wstring& s) {</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keyword">const</span> <span class="keyword">auto</span> last_pos = s.find_last_not_of(L<span class="stringliteral">"\r\n"</span>);</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordflow">if</span> (std::wstring::npos == last_pos)</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordflow">return</span> {};</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordflow">return</span> s.substr(0, last_pos + 1);</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> }</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  </div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> std::string build_what(DWORD code, <span class="keyword">const</span> <span class="keywordtype">char</span>* <span class="keyword">function</span>) {</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  std::ostringstream what;</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  what << <span class="stringliteral">"Function "</span> << <span class="keyword">function</span> << <span class="stringliteral">" failed with error code "</span> << code;</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordflow">return</span> what.str();</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> }</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  </div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> std::string format_message(int32_t code) {</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordtype">wchar_t</span>* buf;</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  </div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keyword">const</span> <span class="keyword">auto</span> len = ::FormatMessageW(</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  NULL,</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  code,</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">reinterpret_cast<</span><span class="keywordtype">wchar_t</span>*<span class="keyword">></span>(&buf),</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  0,</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  NULL);</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  </div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">if</span> (0 == len) {</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  ::LocalFree(buf);</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">return</span> <span class="stringliteral">"Couldn't format the error message"</span>;</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  }</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  </div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  std::wstring msg{buf, len};</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  ::LocalFree(buf);</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">return</span> narrow(trim_trailing_newline(msg));</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> }</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> } <span class="comment">// namespace</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  </div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> std::string CategoryWindows::message(int32_t code)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">return</span> format_message(code);</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> }</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  </div>
<div class="line"><a name="l00061"></a><span class="lineno"><a class="line" href="error_8hpp.html#a70c25be1dfd40860d125203f27e664ce"> 61</a></span> std::system_error <a class="code" href="error_8hpp.html#a70c25be1dfd40860d125203f27e664ce">windows</a>(DWORD code, <span class="keyword">const</span> <span class="keywordtype">char</span>* <span class="keyword">function</span>) {</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  static_assert(<span class="keyword">sizeof</span>(DWORD) == <span class="keyword">sizeof</span>(int32_t), <span class="stringliteral">"Aren't DWORDs the same size as ints?"</span>);</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">return</span> std::system_error{</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keyword">static_cast<</span>int32_t<span class="keyword">></span>(code), category_windows(), build_what(code, <span class="keyword">function</span>)};</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> }</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  </div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> } <span class="comment">// namespace error</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> } <span class="comment">// namespace winapi</span></div>
<div class="ttc" id="aerror_8hpp_html"><div class="ttname"><a href="error_8hpp.html">error.hpp</a></div><div class="ttdoc">Make std::system_error work with GetLastError().</div></div>
<div class="ttc" id="aerror_8hpp_html_a70c25be1dfd40860d125203f27e664ce"><div class="ttname"><a href="error_8hpp.html#a70c25be1dfd40860d125203f27e664ce">winapi::error::windows</a></div><div class="ttdeci">std::system_error windows(DWORD code, const char *function)</div><div class="ttdef"><b>Definition:</b> <a href="error_8cpp_source.html#l00061">error.cpp:61</a></div></div>
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