Qt解析CSV文件

最近需要解析Excel文件，于是顺带写了解析CSV的代码

定义数据类型LX::Sheet

 #ifndef LX_H
 #define LX_H

 #include <QString>
 #include <QStringList>

 namespace LX
 {
 class Sheet
 {
     enum FieldType{STRING, INT, DOUBLE, BOOL};
 public:
     Sheet(){}
     Sheet(Sheet&& rhs);
     Sheet &operator =(Sheet &&rhs);
 public:
     QString name;
     QList<QStringList> data;
     QList<FieldType> fieldTypes;
 };
 }

 #endif // LX_H

//解析CSV文件
 1 LX::Sheet FileParse::parseCSV(const QString &fileName)
 {
     LX::Sheet sheet;

     int nameStartIndex = fileName.lastIndexOf('/') + ;
     if(nameStartIndex < )
     {
         nameStartIndex = fileName.lastIndexOf('\\') + ;
     }
     int nameEndIndex = fileName.lastIndexOf('.');
     sheet.name = fileName.mid(nameStartIndex, nameEndIndex - nameStartIndex);

     QFile file(fileName);
     if(!file.open(QIODevice::ReadOnly | QIODevice::Text))
     {
         return sheet;
     }

     QTextStream inStream(&file);

     for( QString lineStr; !inStream.atEnd(); )
     {
         lineStr = inStream.readLine();
         if(lineStr.isEmpty())
         {
             continue;
         }

         sheet.data.append(splitCSVLine(lineStr));
     }

     return qMove(sheet);
 }

 QStringList FileParse::splitCSVLine(const QString &lineStr)
 {
     QStringList strList;
     QString str;

     int length = lineStr.length();
     int quoteCount = ;
     int repeatQuoteCount = ;

     for(int i = ; i < length; ++i)
     {
         if(lineStr[i] != '\"')
         {
             repeatQuoteCount = ;
             if(lineStr[i] != ',')
             {
                 str.append(lineStr[i]);
             }
             else
             {
                 if(quoteCount % )
                 {
                     str.append(',');
                 }
                 else
                 {
                     strList.append(str);
                     quoteCount = ;
                     str.clear();
                 }
             }
         }
         else
         {
             ++quoteCount;
             ++repeatQuoteCount;
             if(repeatQuoteCount == )
             {
                 str.append('\"');
                 repeatQuoteCount = ;
                 quoteCount -= ;
             }
         }
     }
     strList.append(str);

     return qMove(strList);
 }

生成CSV文件

 bool FileParse::generateCSV(const QString &fileName, const LX::Sheet &sheet)
 {
     QFile file(fileName);
     bool openOk = file.open(QIODevice::WriteOnly);
     if(!openOk)
     {
         return false;
     }
     QTextStream outStream(&file);

     int strCount = sheet.data.count();
     for(int i = ; i < strCount; ++i)
     {
         outStream << joinCSVStrs(sheet.data.at(i));
         outStream << '\n';
     }

     return true;
 }

 QString FileParse::joinCSVStrs(const QStringList &strList)
 {
     QString lineStr;

     int strCount = strList.count();
     int lastStrIndex = strCount - ;

     for(int k = ; k < strCount; ++k)
     {
         QString tarStr;
         bool commaFlag = false;

         const QString& oriStr = strList.at(k);
         int length = oriStr.length();
         for(int i = ; i < length; ++i)
         {
             if(oriStr[i] == ',')
             {
                 tarStr.append(oriStr[i]);
                 commaFlag = true;
             }
             else if(oriStr[i] == '\"')
             {
                 tarStr.append("\"\"\"\"");
             }
             else
             {
                 tarStr.append(oriStr[i]);
             }
         }
         if(commaFlag)
         {
             tarStr.push_front('\"');
             tarStr.push_back('\"');
         }
         if(k != lastStrIndex)
         {
             tarStr.append(',');
         }

         lineStr.append(tarStr);
     }

     return qMove(lineStr);
 }

解析规则为：

1、若逗号间无数据，仍解释为空数据

2、若字段中含有逗号则用"将字段包含起来

3、若数据中存在 " ，则将其替换为 """"

转自:http://www.cnblogs.com/lixtary/p/4252586.html