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</o:shapelayout></xml><![endif]--></head><body lang=EN-NZ link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>How does this work on Linux? is char define as wchar there?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>If Proj is returning UTF8 strings, shouldn’t the functions be using wchar, or TCHAR at the least?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Is there a compatibility reason to use char **?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'> PROJ <proj-bounces@lists.osgeo.org> <b>On Behalf Of </b>Peter Townsend via PROJ<br><b>Sent:</b> Thursday, 6 April 2023 10:38<br><b>To:</b> Even Rouault <even.rouault@spatialys.com><br><b>Cc:</b> proj <proj@lists.osgeo.org><br><b>Subject:</b> Re: [PROJ] PROJ and Unicode on Windows<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Well it's not the console I'm worried about, that's coming straight from the VS debugger. Knowing that strings are always coming out of PROJ in UTF-8 is good. <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Ultimately I'm sending the output to a C# DLL, so I need to CoTaskMemAlloc my string. If I do something like this:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>std::wstring s2ws(const char* utf8Bytes)<br>{<br>const std::string& str(utf8Bytes);<br>int size_needed = MultiByteToWideChar(CP_UTF8, 0, &str[0], (int)str.size(), NULL, 0);<br>std::wstring wstrTo(size_needed, 0);<br>MultiByteToWideChar(CP_UTF8, 0, &str[0], (int)str.size(), &wstrTo[0], size_needed);<br>return wstrTo;<br>}<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Then I see the corrected UTF-8 text in the wstring. As mentioned this isn't something I'm terribly familiar with, and I'd like to avoid writing terrible C code and exploding buffers.<o:p></o:p></p></div><div><p class=MsoNormal>CoTaskMemAlloc needs the actual number of bytes, and we'll need an extra spot for the null terminator. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>const wchar_t* u_convertResult(const char* result) {<br>if (!result)<br>return nullptr;<br><br>std::wstring wstr = s2ws(result);<br>auto wlen = wstr.length() + 1;<br>auto len = wlen * sizeof(wchar_t);<br>wchar_t* buff = (wchar_t*)CoTaskMemAlloc(len);<br>if (buff) {<br>wcscpy_s(buff, wlen, wstr.c_str());<br>}<br>return buff;<br>}<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Does this sound reasonable for Windows?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>And as for Linux and maintaining a multi-platform compatibility, I'd define an alias function like this instead:<o:p></o:p></p></div><div><p class=MsoNormal>const wchar_t* u_convertResult(const char* result) {<br>std::string str(result);<br>std::wstring wstr = std::wstring(str.begin(), str.end());<br><br>auto wlen = wstr.length() + 1;<br>auto len = wlen * sizeof(wchar_t);<br>wchar_t* buff = (wchar_t*)malloc(len);<br>if (buff) {<br>wcscpy(buff, wstr.c_str());<br>}<br>return buff;<br>}<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Since it's already happily working as UTF-8 on Linux, I should be able to pass in the original string to the wstring. CoTaskMemAlloc is just malloc. Does this sound okay too?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Thanks!<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div></div></div></div></div></body></html>