04 调用QString::fromStdString导致程序崩溃

在VS2015环境下使用QT5.9时,调用QString::fromStdString函数会导致程序崩溃,原因是Debug模式下错误地引用了Release版本的QCore.dll(变为QCored.dll)。解决方法是确保在Debug和Release模式下正确引用对应的QT库文件。

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项目场景

VS2015+QT5.9


问题描述

调用QString::fromStdString导致程序崩溃

#include <string>
using namespace std;

#include <qtcore/qstring>

int main() {
    string s = "111";
    QString ss = QString::fromStdString(s);
    return 0;
}

原因分析

Debug模式下引用了Release版本的库(QCore.dll改为QCored.dll)
(更深层原因未知)

解决方案

Debug模式下QT引用库QCored.dll
Release模式下QT引用库QCored.dll

#include "mainwindow.h" #include <qmenubar.h> #include <regex> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) { createUI(); setupMenu(); setWindowTitle("Rust词法分析器"); resize(800, 600); } void MainWindow::createUI() { QSplitter *splitter = new QSplitter(this); // 左侧分类树 treeWidget = new QTreeWidget; treeWidget->setHeaderLabel("词法分类"); // 右侧代码视图 codeView = new QTextEdit; codeView->setReadOnly(true); splitter->addWidget(treeWidget); splitter->addWidget(codeView); setCentralWidget(splitter); } void MainWindow::setupMenu() { QMenu *fileMenu = menuBar()->addMenu("文件"); QAction *openAct = new QAction("打开", this); connect(openAct, &QAction::triggered, this, &MainWindow::openFile); fileMenu->addAction(openAct); } void MainWindow::openFile() { QString path = QFileDialog::getOpenFileName(this, "打开Rust文件", "", "Rust文件 (*.rs)"); if (path.isEmpty()) return; QFile file(path); if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) { QMessageBox::warning(this, "错误", "无法打开文件"); return; } QTextStream in(&file); QString content = in.readAll(); file.close(); codeView->setText(content); analyzeCode(content); } // 核心词法分析函数 void MainWindow::analyzeCode(const QString &content) { tokens.clear(); treeWidget->clear(); // 正则表达式模式(按优先级排序) const std::vector<std::pair<QString, QString>> patterns = { {"COMMENT", R"((//.*|/\*[\s\S]*?\*/))"}, {"STRING", R"((r?#*".*?"#*))"}, {"KEYWORD", R"(\b(as|async|await|break|const|continue|dyn|else|enum|extern|fn|for|if|impl|in|let|loop|match|mod|move|mut|pub|ref|return|self|Self|static|struct|super|trait|type|union|unsafe|use|where|while)\b)"}, {"LITERAL", R"((0b[01_]+|0o[0-7_]+|0x[\dA-Fa-f_]+|[\d_]+(\.[\d_]+)?([eE][+-]?[\d_]+)?))"}, {"OPERATOR", R"(([-+*/%=&|<>!^]=?|<<|>>|&&|\|\||\.\.=|\.\.))"}, {"DELIMITER", R"([{}()\[\],;:])"}, {"IDENT", R"(([_a-zA-Z][_a-zA-Z0-9]*))"} }; // 逐行分析 int lineNum = 1; for (const QString &line : content.split('\n')) { QString remaining = line.trimmed(); while (!remaining.isEmpty()) { bool matched = false; for (const auto &[type, regexStr] : patterns) { std::regex reg(regexStr.toStdString(), std::regex_constants::icase); std::smatch match; std::string str = remaining.toStdString(); if (std::regex_search(str, match, reg, std::regex_constants::match_continuous)) { QString value = QString::fromStdString(match[1]); tokens.push_back({type, value, lineNum}); addTreeItem(type, tokens.back()); remaining.remove(0, match[1].length()); remaining = remaining.trimmed(); matched = true; break; } } if (!matched) { qDebug() << "无法解析: " << remaining.left(10); break; } } lineNum++; } } void MainWindow::addTreeItem(const QString &category, const Token &token) { QList<QTreeWidgetItem*> items = treeWidget->findItems(category, Qt::MatchExactly); QTreeWidgetItem *categoryItem; if (items.isEmpty()) { categoryItem = new QTreeWidgetItem(treeWidget); categoryItem->setText(0, category); } else { categoryItem = items.first(); } QTreeWidgetItem *child = new QTreeWidgetItem(); child->setText(0, QString("%1 (Line %2)").arg(token.value).arg(token.line)); categoryItem->addChild(child); treeWidget->expandAll(); } 分析代码,检查有无问题
03-23
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