文本搜索程序（Qt）

头文件

#ifndef TEXTFINDER_H
#define TEXTFINDER_H#include <QWidget>
#include <QFileDialog>
#include <QFile>
#include <QTextEdit>
#include <QLineEdit>
#include <QTextStream>
#include <QPushButton>
#include <QMessageBox>
#include <QDebug>
QT_BEGIN_NAMESPACE
namespace Ui {
class textFinder;
}
QT_END_NAMESPACEclass textFinder : public QWidget
{Q_OBJECTpublic:textFinder(QWidget *parent = nullptr);~textFinder();public slots:void lodeTextFile();private:Ui::textFinder *ui;void searchText();bool search_flog;
};
#endif // TEXTFINDER_H

cpp文件

#include "textfinder.h"
#include "./ui_textfinder.h"textFinder::textFinder(QWidget *parent): QWidget(parent), ui(new Ui::textFinder)
{ui->setupUi(this);ui->textEdit->setReadOnly(true);connect(ui->loadFile,&QPushButton::clicked,[=](){lodeTextFile();});connect(ui->search,&QPushButton::clicked,[=](){searchText();});
}textFinder::~textFinder()
{delete ui;
}void textFinder::lodeTextFile()//加载文本文件
{QString path = QFileDialog::getOpenFileName();if(!path.isEmpty()){QFile file(path);if (!file.open(QIODevice::ReadOnly | QIODevice::Text)){QMessageBox::warning(this, tr("Read Text File"),tr("Cannot open file:\n%1").arg(path));return;}QTextStream in(&file);ui->textEdit->setText(in.readAll());//读取文本file.close();}else{QMessageBox::warning(this, tr("Path"),tr("You did not select any file."));}}void textFinder::searchText()//查找文本
{if(ui->textEdit->document()->isEmpty() || ui->lineEdit->text().isEmpty()){QMessageBox::warning(this, tr("Warning"), "The text or searchline is empty!");return;}QString searchText = ui->lineEdit->text();QTextDocument* document = ui->textEdit->document();bool foundWholeWord = false;//查找标志位QTextCursor highlightCursor(document);//文本光标QTextCursor cursor(document);ui->textEdit->document()->undo(); // 清除之前的高亮cursor.beginEditBlock();QTextCharFormat plainFormat(highlightCursor.charFormat());//文本样式QTextCharFormat colorFormat = plainFormat;colorFormat.setForeground(Qt::red);//如果找到则置红while (!highlightCursor.isNull() && !highlightCursor.atEnd()){highlightCursor = document->find(searchText, highlightCursor);if (!highlightCursor.isNull()){foundWholeWord = true;highlightCursor.movePosition(QTextCursor::WordRight, QTextCursor::KeepAnchor);highlightCursor.mergeCharFormat(colorFormat);}}cursor.endEditBlock();if (!foundWholeWord) {QMessageBox::information(this, tr("Partial Match Found"),tr("The text '%1' was found as part of other words but not as a whole word.").arg(searchText));}
}

main

#include "textfinder.h"#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);textFinder w;w.show();return a.exec();
}

功能：可查找想要收索的关键字，找到则标红
当前问题：如果给的文本例如：abcd efg,只搜索a时abcd会一起标红，或许是设置查找模式出了问题
解决方案：查看是否是查找模式设置出了问题，如不是，则可通过kmp字符串匹配修改查找方案