QT QPlainTextEdit 获取某行内容

#include 

QString str;

/* 行数 */
str = QString::number(ui->plainTextEdit->document()->lineCount());
QMessageBox::information(this, "information", str);

/* 输出某行内容 */ 
str = ui->plainTextEdit->document()->findBlockByLineNumber(2).text(); 
QMessageBox::information(this, "information", str);


 
  

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