使用C++解析IFC中的構件名稱
比如：#1318= IFCWALL('2iW_ibiC5FdBGj9bA43z7h',#42,'\X2\57FA672C5899\X0\:\X2\5899\X0\ 1:7545',$,'\X2\57FA672C5899\X0\:\X2\5899\X0\ 1:1641',#1295,#1314,'7545',.NOTDEFINED.);
這裡IFCWALL，表述一面牆，它的名稱為：
"基本牆:牆 1:7545"
在IFC中用"\X2\57FA672C5899\X0\:\X2\5899\X0\ 1:7545"字串表述。
解析程式碼如下：
#include <iostream> #include <string> #include <vector> #include <codecvt> #ifndef CP_UTF8 #define CP_UTF8 65001 #endif // #include <QString> #include <QByteArray> #include <QChar> #include <QTextCodec> #include <QDebug> // 假設輸入是一個UTF-16的std::u16string std::string utf16_to_utf8(const std::u16string& u16str) { std::string utf8str; for (char16_t c : u16str) { if (c < 0x80) { // 1位元組的UTF-8字元 utf8str.push_back(static_cast<char>(c)); } else if (c < 0x800) { // 2位元組的UTF-8字元 utf8str.push_back(0xC0 | (c >> 6)); utf8str.push_back(0x80 | (c & 0x3F)); } else { // 3位元組的UTF-8字元 utf8str.push_back(0xE0 | (c >> 12)); utf8str.push_back(0x80 | ((c >> 6) & 0x3F)); utf8str.push_back(0x80 | (c & 0x3F)); } } return utf8str; } template <typename T> static T convertToHex(unsigned char mc) { if (mc >= '0' && mc <= '9') { return static_cast<T>(mc) - static_cast<T>('0'); } else if (mc >= 'A' && mc <= 'F') { return 10 + static_cast<T>(mc) - static_cast<T>('A'); } else if (mc >= 'a' && mc <= 'f') { return 10 + static_cast<T>(mc) - static_cast<T>('a'); } return 0; } // static char16_t checkAndConvertAppleEncoding(char16_t input) { if (input >= 0x80 && input <= 0xFF) { switch (input) { case 0x80: return 196; case 0x81: return 197; case 0x82: return 199; case 0x83: return 201; case 0x84: return 209; case 0x85: return 214; case 0x86: return 220; case 0x87: return 225; case 0x88: return 224; case 0x89: return 226; case 0x8A: return 228; case 0x8B: return 227; case 0x8C: return 229; case 0x8D: return 231; case 0x8E: return 233; case 0x8F: return 232; case 0x90: return 234; case 0x91: return 235; case 0x92: return 237; case 0x93: return 236; case 0x94: return 238; case 0x95: return 239; case 0x96: return 241; case 0x97: return 243; case 0x98: return 242; case 0x99: return 244; case 0x9A: return 246; case 0x9B: return 245; case 0x9C: return 250; case 0x9D: return 249; case 0x9E: return 251; case 0x9F: return 252; case 0xA0: return 8224; case 0xA1: return 176; case 0xA2: return 162; case 0xA3: return 163; case 0xA4: return 167; case 0xA5: return 8226; case 0xA6: return 182; case 0xA7: return 223; case 0xA8: return 174; case 0xA9: return 169; case 0xAA: return 8482; case 0xAB: return 180; case 0xAC: return 168; case 0xAD: return 8800; case 0xAE: return 198; case 0xAF: return 216; case 0xB0: return 8734; case 0xB1: return 177; case 0xB2: return 8804; case 0xB3: return 8805; case 0xB4: return 165; case 0xB5: return 181; case 0xB6: return 8706; case 0xB7: return 8721; case 0xB8: return 8719; case 0xB9: return 960; case 0xBA: return 8747; case 0xBB: return 170; case 0xBC: return 186; case 0xBD: return 937; case 0xBE: return 230; case 0xBF: return 248; case 0xC0: return 191; case 0xC1: return 161; case 0xC2: return 172; case 0xC3: return 8730; case 0xC4: return 402; case 0xC5: return 8776; case 0xC6: return 8710; case 0xC7: return 171; case 0xC8: return 187; case 0xC9: return 8230; case 0xCA: return 160; case 0xCB: return 192; case 0xCC: return 195; case 0xCD: return 213; case 0xCE: return 338; case 0xCF: return 339; case 0xD0: return 8211; case 0xD1: return 8212; case 0xD2: return 8220; case 0xD3: return 8221; case 0xD4: return 8216; case 0xD5: return 8217; case 0xD6: return 247; case 0xD7: return 9674; case 0xD8: return 255; case 0xD9: return 376; case 0xDA: return 8260; case 0xDB: return 8364; case 0xDC: return 8249; case 0xDD: return 8250; case 0xDE: return 64257; case 0xDF: return 64258; case 0xE0: return 8225; case 0xE1: return 183; case 0xE2: return 8218; case 0xE3: return 8222; case 0xE4: return 8240; case 0xE5: return 194; case 0xE6: return 202; case 0xE7: return 193; case 0xE8: return 203; case 0xE9: return 200; case 0xEA: return 205; case 0xEB: return 206; case 0xEC: return 207; case 0xED: return 204; case 0xEE: return 211; case 0xEF: return 212; case 0xF0: return 63743; case 0xF1: return 210; case 0xF2: return 218; case 0xF3: return 219; case 0xF4: return 217; case 0xF5: return 305; case 0xF6: return 710; case 0xF7: return 732; case 0xF8: return 175; case 0xF9: return 728; case 0xFA: return 729; case 0xFB: return 730; case 0xFC: return 184; case 0xFD: return 733; case 0xFE: return 731; case 0xFF: return 711; } } return input; } // void decodeArgumentString(const std::string& argument_str, std::string& arg_out) { const size_t arg_length = argument_str.length(); if (arg_length == 0) { return; } std::string arg_str_new; char* stream_pos = const_cast<char*>(argument_str.c_str()); // ascii characters from STEP file while (*stream_pos != '\0') { if (*stream_pos == '\\') { char c1 = *(stream_pos + 1); if (c1 == 'S') { // we have \S char c2 = *(stream_pos + 2); if (c2 == '\\') { // we have '\S\', for example 'Heizk\S\vrper' char c3 = *(stream_pos + 3); if (c3 != '\0') { char c4 = *(stream_pos + 4); if (c4 == '\\') { // we have '\S\ . \' char c5 = *(stream_pos + 5); if (c5 == 'S') { if (*(stream_pos + 6) == '\\') { if (*(stream_pos + 7) != '\0') { char first = c3; char second = *(stream_pos + 7); char append_char = char(125 + first + second); arg_str_new += append_char; stream_pos += 8; continue; } } } else if (c5 == 'Q') { if (*(stream_pos + 6) == '\\') { if (*(stream_pos + 7) != '\0') { char first = c3; char second = *(stream_pos + 7); char append_char = char(125 + first + second); arg_str_new += append_char; stream_pos += 8; continue; } } } } else { // next characters code value v shall be interpreted as v + 128 char first = c3; char append_char = char(128 + first); uint8_t charAsUint = append_char; arg_str_new.push_back(0xc0 | charAsUint >> 6); arg_str_new.push_back(0x80 | (charAsUint & 0x3f)); stream_pos += 4; continue; } } } } else if (c1 == 'X') { char c2 = *(stream_pos + 2); if (c2 == '\\') { // we have \\X\\Unicode code points char codePoint1 = *(stream_pos + 3); char codePoint2 = *(stream_pos + 4); codePoint1 = convertToHex<char>(codePoint1); codePoint2 = convertToHex<char>(codePoint2); // Combine the Unicode values into a single char char combined[2]; combined[0] = (codePoint1 << 4) | codePoint2; combined[1] = 0; char16_t* combined16 = reinterpret_cast<char16_t*>(combined); if (combined16[0] >= 0x80 && combined16[0] <= 0x9F) { combined16[0] = checkAndConvertAppleEncoding(combined16[0]); } std::u16string u16str(combined16, 1); //std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert; //std::string utf8str = convert.to_bytes(u16str); // 轉換為UTF-8 std::string utf8str = utf16_to_utf8(u16str); arg_str_new += utf8str; stream_pos += 5; continue; } else if (c2 == '0') { if (*(stream_pos + 3) == '\\') { stream_pos += 4; continue; } } else if (c2 == '2') { if (*(stream_pos + 3) == '\\') { // we have \X2\Unicode code points // for example pot\X2\00EA\X0\ncia // the following sequence of multiples of four hexadecimal characters shall be interpreted as encoding the // two-octet representation of characters from the BMP in ISO 10646 stream_pos += 4; std::vector<char> utf16Characters; do { char codePoint1 = *(stream_pos + 0); if (codePoint1 == '\\') { char c1 = *(stream_pos + 1); char c2 = *(stream_pos + 2); char c3 = *(stream_pos + 3); if (c1 == 'X' && c2 == '0' && c3 == '\\') { stream_pos += 4; break; } else { // unexpected sequence arg_out = argument_str; return; } } char codePoint2 = *(stream_pos + 1); char codePoint3 = *(stream_pos + 2); char codePoint4 = *(stream_pos + 3); char c1 = (convertToHex<char>(codePoint1) << 4) | convertToHex<char>(codePoint2); char c2 = (convertToHex<char>(codePoint3) << 4) | convertToHex<char>(codePoint4); utf16Characters.push_back(c2); utf16Characters.push_back(c1); stream_pos += 4; } while ((*stream_pos != '\0')); std::u16string u16str(reinterpret_cast<char16_t*>(&utf16Characters[0]), utf16Characters.size() / 2); //std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert; //std::string utf8 = convert.to_bytes(u16str); // 轉換為UTF-8 std::string utf8str = utf16_to_utf8(u16str); arg_str_new += utf8str; } continue; } } else if (c1 == 'N') { if (*(stream_pos + 2) == '\\') { arg_str_new.append("\n"); stream_pos += 3; continue; } } } char current_char = *stream_pos; arg_str_new += current_char; ++stream_pos; } arg_out = arg_str_new; } // // static short convertToHex(unsigned char mc) { short returnValue; if (mc >= '0' && mc <= '9') { returnValue = static_cast<short>(mc) - static_cast<short>('0'); } else if (mc >= 'A' && mc <= 'F') { returnValue = 10 + static_cast<short>(mc) - static_cast<short>('A'); } else if (mc >= 'a' && mc <= 'f') { returnValue = 10 + static_cast<short>(mc) - static_cast<short>('a'); } else { returnValue = 0; } return (returnValue); } // static char Hex2Char(unsigned char h1, unsigned char h2) { char returnValue = (convertToHex(h1) << 4) + convertToHex(h2); return (returnValue); } // // static char Hex4Char(unsigned char h1, unsigned char h2, unsigned char h3, unsigned char h4) { char returnValue = (convertToHex(h1) << 12) + (convertToHex(h2) << 8) + (convertToHex(h3) << 4) + convertToHex(h4); return (returnValue); } // int main() { //QString str1 = "\\X2\\57FA672C5899\\X0\\:\\X2\\5899\\X0\\ 2:3521"; //QString str1 = "\\X2\\77E95F6267F1\\X0\\:475 x 610mm:4621"; QString str1 = "\\X2\\57FA672C5899\\X0\\:\\X2\\5899\\X0\\ 1:7545"; // qDebug() << "===============\n"; std::string decoded; decodeArgumentString(str1.toStdString(), decoded); qDebug() << "" << QString::fromStdString(decoded);//輸出： qDebug() << "===============\n"; ////////////////////////// return 0; }
輸出結果為：
=============== "基本牆:牆 1:7545" ===============
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