c++ - 在 Qt 中更改主窗口标题

Question

我正在用 Qt C++ 制作一个文本编辑器，当我打开一个 txt 文件时，我想将标题更改为打开的文件的名称我知道 setWindowTitle("title go here") 。我只能显示路径。这是打开新文档的功能部分。

QString fileName = QFileDialog::getOpenFileName(
            this,
            "TextEditor - Open" ,
            "C:\\",
            " Text File(*.txt);;All files (*.*)");

QFile file1(fileName);
    if((!fileName.isEmpty()))
     {
     currentFile = fileName;
     file1.open(QIODevice::ReadOnly|QIODevice::Text);
     QTextStream in(&file1);
     QString str1 = in.readAll();
     ui->plainTextEdit-> setPlainText(str1);
     file1.close();
     statusBar()-> showMessage(" File successfully loaded! ");
     saveRecent(currentFile);
     }

    setWindowTitle(currentFile);

Answer 1

我格式化了您的代码并添加了显示正确文件名(包括扩展名但不包括路径)所需的代码。

QString fileName = QFileDialog::getOpenFileName(
            this,
            "TextEditor - Open" ,
            "C:\\",
            " Text File(*.txt);;All files (*.*)");

QFile file1(fileName);
if(!fileName.isEmpty())
{
     currentFile = fileName;

     file1.open(QIODevice::ReadOnly|QIODevice::Text);
     QTextStream in(&file1);
     QString str1 = in.readAll();
     ui->plainTextEdit-> setPlainText(str1);
     file1.close();

     statusBar()-> showMessage(" File successfully loaded! ");
     saveRecent(currentFile);
 }
 // Create the FileInfo 
 QFileInfo file1Info(file1);

 // now get the fileName
 QString file1Name(file1Info.fileName());

 // Set the Title to the fileName
 setWindowTitle(file1Name);

另请参阅 QFileInfo.fileName() 的文档.