Qt读写文件的简单封装
C#中，有下列函数可以简单地读写文件：
读: temp = File.ReadAllText("abc.txt",Encoding.Default);
写: File.WriteAllText("abc.txt", temp, Encoding.Default);
追加: File.AppendAllText("abc.txt", temp, Encoding.Default);

现在我也来用Qt彷写一个，以后读写简单的文本文件就不用这么麻烦啦。

#include <QtCore>class RWFile{public:/*fileName: 要读写的文件名text: 要写入（或被写入的字符串）codec: 文字编码返回值: 失败就返回false, 成功则返回true*/static bool ReadAllText(const QString &fileName, QString &text,const char *codec=NULL);static bool WriteAllText(const QString &fileName, const QString &text,const char *codec=NULL);static bool AppendAllText(const QString &fileName, const QString &text,const char *codec=NULL);};bool RWFile::ReadAllText(const QString &fileName, QString &text, const char *codec){QFile file(fileName);if( !file.open(QIODevice::ReadOnly) )return false;QTextStream in(&file);if( codec != NULL )in.setCodec(codec);text = in.readAll();file.close();return true;}bool RWFile::WriteAllText(const QString &fileName, const QString &text, const char *codec){QFile file(fileName);if( !file.open(QIODevice::WriteOnly) )return false;QTextStream out(&file);if( codec != NULL )out.setCodec(codec);out << text;file.close();return true;}bool RWFile::AppendAllText(const QString &fileName, const QString &text, const char *codec){QFile file(fileName);if( !file.open(QIODevice::Append) )return false;QTextStream out(&file);if( codec != NULL )out.setCodec(codec);out << text;file.close();return true;}int main(int argc, char **argv){QCoreApplication app(argc, argv);QString temp("abcde");bool ok1, ok2, ok3;ok1 = RWFile::WriteAllText("abc.txt", temp, "UTF-8");ok2 = RWFile::AppendAllText("abc.txt", temp, "UTF-8");ok3 = RWFile::ReadAllText("abc.txt", temp, "UTF-8");if( ok1 && ok2 && ok3 ){qDebug() << temp;}return 0;}