复制代码QPushButton的四个信号：pressed()，clicked()，released()，toggled()

本文转载自：https://blog.csdn.net/weixin_43742643/article/details/101706477

pressed()：鼠标按下时触发。对应的函数是mousePressEvent()。
clicked()：鼠标松开时触发。如果鼠标拖拽到按钮区域释放之外则不会触发。对应的函数是mouseReleaseEvent()。一般情况下connect槽函数时使用该信号。
released()：鼠标松开时触发。即使鼠标拖拽到按钮区域之外释放也会触发。对应的函数是mouseReleaseEvent()。
正常情况下单击按钮，响应顺序为：pressed()- ..

复制代码//查看当前网络请求支持协议

QStringList zhi=manger->supportedSchemes();
QString str = zhi.join(" "); // 将各段用":"连接形成新的字符串
QMessageBox msgBox;
msgBox.setText("当前手机支持协议:\n"+str);
msgBox.exec(); 复制代码// 发送https请求前准备工作;
network_request->setUrl(QUrl(ui->lineEdit->text()));
QSslConfiguration conf = network_request->sslConfiguration();
conf.setPeerVerifyMode(QSslSocket::VerifyNone);
conf.setProtocol(QSsl:: ..

原文出处：https://blog.csdn.net/nodeman/article/details/10646659
Android: https://blog.csdn.net/bobcat_kay/article/details/80889398
fmpeg各项库说明，及build.sh的shell相关命令说明:
https://blog.csdn.net/u014436704/article/details/106763235

ffmpeg----configure参数配置说明:

https://blog.csdn.net/nodeman/article/details/106466597
注意
configure会在控制台输出编译的配置信息，此时一定要认真查看一下里面的信息，特别警告信息，因为你配置的一些选项可能由于条件不满足configure会自动关闭的，或者你把–fatal-w ..

复制代码正确顺序是

LIBS += -L/ -lavformat -lavfilter -lavcodec -lswresample -lswscale -lavutil -lavdevice

QTableWidget表头设置无效的原因



clear () // 清空表格中所有内容（包含表头）
clearContents () // 清空表格中的内容（不包含表头）。
ui->tableWidget->clearContents(); ui->tableWidget->horizontalHeader()->setStretchLastSection(true); // 最后一列伸缩铺满 ui->tableWidget->setSelectionBehavior(QAbstractItemView::SelectRows); ui->tableWidget->verticalHeader()->setVisible(false); //设置垂直头不可见 ui->tableWidget->setColumnCount(5); //禁止编辑 ui->tableWidget-> ..

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'>" ..