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//QString tempImagePath="./test.png"; //图片上的字符串，例如 HELLO QString imageText="H E L L O"; QFont font; //设置显示字体的大小 font.setPixelSize(25); QFontMetrics fm(font); int charWidth = fm.width(imageText); ..

#include <QProgressDialog> bool autoClose() const bool autoReset() const void setAutoClose(bool close) void setAutoReset(bool reset) AutoClose默认为true，包含autoReset，会重.

int a = 1024;QString::number(a);//1024

在Qt编写过程中，如多线程使用信号槽时，需要添加Q_OBJECT，但是在添加之后发现编译老会出错。如下：class ThreadSxxx : public QThread{Q_OBJECTpublic:ThreadSxxx ();signals:signaltrig();}编译后总是提示undefined reference to vtable for "xxxx"的错误问题。出现该错误的原因是此时的Q_OBJECT是半途加入的，你需要让项目重新加载编译，解决的办法是直接在.pro文

1.添加QICONQAction *searchAction = new QAction(ui.LineEdit);searchAction->setIcon(QIcon(":/resource/query.png"));ui.LineEdit->addAction(searchAction,QLineEdit::TrailingPosition);//QLineEdit::LeadingPosition 在左侧注：资源路径“./pic.bmp” 表示编译生成路径，不是源码路径QT

1.QFileDialog获取文件QFileDialog *fileDialog = new QFileDialog(this);QString fileName = fileDialog->getOpenFileName(NULL,"标题",".","*.*");/*QStringList fileName = fileDialog->getOpenFileNames(NULL,"标题",".","*.*");qDebug() << file_name.at(0);qD

单选,QBottonGroup,例：checkBox1.头文件#include <QButtonGroup>在头文件添加 QButtonGroup类QButtonGroup *slt_type;3.新建对象，添加控件slt_type = new QButtonGroup(this);slt_type->addbutton(ui->checkBox, 1);//1:IDslt_type->addbutton(ui->checkBox_2, 2);c