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3338289
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0
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2010-07-26T19:30:54.293
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2010-07-27T05:19:19
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2010-07-27T05:19:19
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<p>Here's a version that converts from UTF-16 (wchar) to hex-encoded UTF-8 using the Win32-specific WideCharToMultiByte() function.</p> <pre><code>#include <string> #include <iostream> #include <stdio.h> #include <windows.h> std::string wstring_to_utf8_hex(const std::wstring &input) { std::string output; int cbNeeded = WideCharToMultiByte(CP_UTF8, 0, input.c_str(), -1, NULL, 0, NULL, NULL); if (cbNeeded > 0) { char *utf8 = new char[cbNeeded]; if (WideCharToMultiByte(CP_UTF8, 0, input.c_str(), -1, utf8, cbNeeded, NULL, NULL) != 0) { for (char *p = utf8; *p; *p++) { char onehex[5]; _snprintf(onehex, sizeof(onehex), "%%%02.2X", (unsigned char)*p); output.append(onehex); } } delete[] utf8; } return output; } int main(int, char*[]) { std::wstring ja = L"ドイツ語で検索していてこちらのサイトにたどり着きました。"; std::cout << "result=" << wstring_to_utf8_hex(ja) << std::endl; return 0; } </code></pre> <p>To go the other way, you'll need to use some parsing to decode the hex values into a UTF-8 buffer, and then call the complimentary MultiByteToWideChar() to get it back into a wchar array.</p> <pre><code>#include <string> #include <iostream> #include <ctype.h> #include <stdio.h> #include <stdlib.h> #include <windows.h> std::string unhexlify(const std::string &input) { std::string output; for (const char *p = input.c_str(); *p; ) { if (p[0] == '%' && isxdigit(p[1]) && isxdigit(p[2])) { int ch = (isdigit(p[1]) ? p[1] - '0' : toupper(p[1]) - 'A' + 10) * 16 + (isdigit(p[2]) ? p[2] - '0' : toupper(p[2]) - 'A' + 10); output.push_back((char)ch); p += 3; } else if (p[0] == '%' && p[1] == '#' && isdigit(p[2])) { int ch = atoi(p + 2); output.push_back((char)ch); p += 2; while (*p && isdigit(*p)) p++; if (*p == ';') p++; } else { output.push_back(*p++); } } return output; } std::wstring utf8_hex_to_wstring(const std::string &input) { std::wstring output; std::string utf8 = unhexlify(input); int cchNeeded = MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), -1, NULL, 0); if (cchNeeded > 0) { wchar_t *widebuf = new wchar_t[cchNeeded]; if (MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), -1, widebuf, cchNeeded) != 0) { output = widebuf; } delete[] widebuf; } return output; } int main(int, char*[]) { std::wstring ja = L"ドイツ語で検索していてこちらのサイトにたどり着きました。"; std::string hex = "%E3%83%89%E3%82%A4%E3%83%84%E8%AA%9E%E3%81%A7%E6%A4%9C%E7%B4%A2%E3%81%97%E3%81%A6%E3%81%84%E3%81%A6%E3%81%93%E3%81%A1%E3%82%89%E3%81%AE%E3%82%B5%E3%82%A4%E3%83%88%E3%81%AB%E3%81%9F%E3%81%A9%E3%82%8A%E7%9D%80%E3%81%8D%E3%81%BE%E3%81%97%E3%81%9F%E3%80%82"; std::wstring newja = utf8_hex_to_wstring(hex); std::cout << "match?=" << (newja == ja ? "yes" : "no") << std::endl; return 0; } </code></pre>
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