char * 与 const char *的转换
char *ch1="hello11"; const char *ch2="hello22"; ch2 = ch1;//不报错,但有警告 ch1 = (char *)ch2;
char 与 QString 的转换
char a='b'; QString str; str=QString(a);
QString 转换为 char
QString str="abc"; char *ch; QByteArray ba = str.toLatin1() ch = ba.data();
QByteArray 与 char* 的转换
QByteArray 转换为 char *
char *ch;//不要定义成ch[n]; QByteArray byte; ch = byte.data();
char * 转换为 QByteArray
char *ch; QByteArray byte; byte = QByteArray(ch);
QString 与 QByteArray 的转换
QString转换为QByteArray
QByteArray byte; QString string; byte = string.toAscii();
QByteArray 转换为 QString
QByteArray byte; QString string; string = QString(byte);
这里再对这俩中类型的输出总结一下:
qDebug()<<"print"; qDebug()<<tr("print"); qDebug()<<ch;(ch 为char类型) qDebug()<<tr(ch); qDebug()<<byteArray;(byteArray是QByteArray类型) qDebug()<<tr(byteArray); qDebug()<<str;(str 为Qstring类型)
qDebug()<<tr(str.toLatin1);
int 与 QString的转换
int ת QString
int a=10; QString b; b=QString::number(a)
QString תint
QString a="120" int b; b=a.toInt()
QString与string的转换
QString.toStdString(); string --> QString QString::fromStdString(string)
QString与其他类型的转换
QString ―>int,double,char *
QString::toInt() QString::toDouble() QString.toStdString().c_str();
可以采用里的stringstream
int a = 3; stringstream ss; string strInt; ss<<a; ss>>strInt;
QDateTimeתQString
public QDateTime qdate = QDateTime.currentDateTime(); datetime = qdate.toString("yyyy年MM月dd日ddddhh:mm:ss"); //2012年03月-05日Monday13:48:55 QString转换成QDateTime QDateTime dateTime2 = QDateTime::fromString("M1d1y9800:01:02","'M'M'd'd'y'yyhh:mm:ss");
QString qstr("hello,word"); const char * p = qstr.toLocal8Bit().data();
const char *p = qstr.toStdString().data(); //转换过来的是常量
QString str="abc"; char *ch; QByteArray ba = str.toLatin1() ch = ba.data();
QString tmp = "test"; QByteArray text = tmp.toLocal8Bit(); char *data = new char[text.size() + 1] strcpy(data, text.data()); delete [] data;
QDateTime 转换为 QString
QString strBuffer; QDateTime time; time = QDateTime::currentDateTime(); strBuffer = time.toString("yyyy-MM-dd hh:mm:ss"); // strBuffer = 2015-12-21 17:35:00
String 转换为 QDateTime
QString strBuffer; QDateTime time; strBuffer = "2010-07-02 17:35:00"; time = QDateTime::fromString(strBuffer, "yyyy-MM-dd hh:mm:ss");