bool bSupp = QSslSocket::supportsSsl(); QString buildVersion = QSslSocket::sslLibraryBuildVersionString(); QString version = QSslSocket::sslLibraryVersionString(); qDebug() << bSupp << buildVersion << version << endl; QMessageBox msgBox; msgBox.setText("当前QT版本支持OpenSSL:"+buildVersion+version); msgBox.exec();//查看当前网络请求支持协议 //qDebug()<<manager->supportedSchemes(); QStringList zhi=manager->supportedSchemes();
QString str = zhi.join( ..

1.优化前：
复制代码QFont font("Times", 30, QFont::Bold);
this->setFont(font);
le = new QLineEdit("0");
le->setAlignment(Qt::AlignRight);
le->setFixedHeight(100);
le->setReadOnly(true);
QStringList l = {"0","1","2","3","4","5","6","7","8",\
"9",".","+","-","*","/","<-","C","="} ..

//函数setAlignment()主要将是消除布局中的空隙，让两个控件紧紧挨在一起
ui->textEdit->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
//隐藏横向滚动条
ui->textEdit->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
//隐藏竖向滚动条
ui->textEdit->setVerticalScrollBarPolicy( Qt::ScrollBarAlwaysOff );

/设置动态背景图片
QString image_url=song_urll_list.at(index).image_url;
//为了不占空间所以不用这句song_info_list.at(index).songname而用song_url.song_name的目的数据会覆盖该隐形文件
//如果在手机上路径要改"./sdcard/.jpg"
QString file_path=QString("./.jpg").arg(song_url.song_name);
get_pixmap=new Get_Pixmap;

get_pixmap->getPixmap_File(file_path,image_url);
QString css=QString("background-image:url(./.jpg)").arg(song_url.song_name);
ui->lycwidget->s ..

//实现颜色随机
int R=qrand()%255;
int G=qrand()%255;
int B=qrand()%255;
if(m_lyric_list.size() <= 0 || m_iCurrentIndex >= m_lyric_list.size())
return;


for(int i = 0; i < m_lyric_list.size(); i++)
{

if(position > m_lyric_list.at(i).time)
{
m_iCurrentIndex = i;
}
}


if(position > m_lyric_list.at(m_iCurrentIndex).time)
{
QString lrc;
lrc.clear();
lrc += QString("<p align='center'><span style=' font-style:italic;color:green'>" ..

QString Widget::sec2hms(int duration)
{
//用于时间转换 02:32
int min = duration/60;
int sesc = duration%60;
QString time = QString("%1:%2").arg(min).arg(sesc);
qDebug()<<"时间转化:"<<time;
return time;
}方法2:#include <QtMath>复制代码static QString second2String(int sec)
{
int hours = qFloor(sec / 3600);
int minutes = qFloor(sec % 3600 / 60);
int seconds = qFloor(sec % 3600 % 60);
QString hourStr = QString::number(hours, 10);
QString minStr = QSt ..

//数字大小写转换
QString Widget::numberToZh(int num)
{
QStringList zh = {"零","一","二","三","四","五","六","七","八","九","十"};
QString res = "";
if(num <= 10) {
res = zh;
} else if(num < 20) {
int bits = num % 10;
res = zh[10] + zh;
} else if(num < 100) {
int bits = num % 10;
int decade = num / 10;
if(bits == 0) {
res = zh + zh[10] + "整";
} else ..

复制代码// 文件大小转换
static QString CalcSize(qint64 bytes)
{
QString strUnit;
double dSize = bytes * 1.0;
if (dSize <= 0)
{
dSize = 0.0;
}
else if (dSize < 1024)
{
strUnit = "Bytes";
}
else if (dSize < 1024 * 1024)
{
dSize /= 1024;
strUnit = "KB";
}
else if (dSize < 1024 * 1024 * 1024)
{
dSize /= (1024 * 1024);
strUnit = "MB";
}
else
{
dSize /= (1024 * 1024 * 1024);
strUnit = "GB";
}
return QString("%1 %2&quo ..

//延时
void SLEEP::sleep(int sec)
{
    QTime dieTime = QTime::currentTime().addMSecs(sec);
    while( QTime::currentTime() < dieTime )
        QCoreApplication::processEvents(QEventLoop::AllEvents, 100);
}

QString 转C++自带标准string
思路:
使用QString类自带的toStdStirng()函数即可
例子std::string str;QString qStr = "两袖清风";str =qStr.toStdString();//c_str()函数返回一个指向正规C字符串的指针, 内容与本string串相同.qDebug()<<str.c_str()<<endl;12345
string 转QString
思路：

使用QString自带的静态构造函数 fromStdString(string &s)即可
例子std::string str="两袖清风";QString qStr=QString::fromStdString(str);qDebug()<<qStr.toUtf8().data()<<endl;头文件：# ..