QT生成随机验证码的方法
本文实例为大家分享了QT生成随机验证码的具体代码,供大家参考,具体内容如下
一、先创建一个QT应用程序,在ui中添加一个QFrame控件,后期将这个控件提升为下面自己实现验证码的类就可以显示出来了。
示例代码如下:
mainwindow.h
#ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QMainWindow> #include "verification.h" QT_BEGIN_NAMESPACE namespace Ui { class MainWindow; } QT_END_NAMESPACE class MainWindow : public QMainWindow { Q_OBJECT public: MainWindow(QWidget *parent = nullptr); ~MainWindow(); private slots: void on_pushButton_clicked(); private: Ui::MainWindow *ui; Verification *verification; }; #endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); verification = ui->frame; //提升类控件名 } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_pushButton_clicked() //点击跟新验证码 { verification->Timer_Timeout(); }
主函数:
main.cpp
#include "mainwindow.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); MainWindow w; w.show(); return a.exec(); }
mainwindow.ui
二、右击新添加一个Qt设计师类,在里面实现验证码的随机生成。
代码如下:
verification.h
#ifndef VERIFICATION_H #define VERIFICATION_H #include <QPainter> #include <QTimer> #include <QFrame> #include <QChar> #include <QColor> class Verification : public QFrame { Q_OBJECT public: Verification(QWidget *parent = Q_NULLPTR); ~Verification(); public: QString getVerificationCodes() const; 返回一个字符串(默认全为小写)(验证码) QChar produceRandomLetters() const; //随机产生一个字符 void produceVerificationCodes() const; //这是一个用来生成验证码的函数 void produceRandomColors() const; //产生随机的颜色 void paintEvent(QPaintEvent *event); //重写绘制事件,以此来生成验证码 Qt::GlobalColor* getColor(); //返回设置验证码的颜色 void Timer_Timeout(); QString getCaptcha(); private: const int letter_number = 4; //产生字符的数量 Qt::GlobalColor* m_color; QString m_captcha; QTimer m_timer; enum { //枚举分类,也可自己定义 NUMBER_FLAG, UPLETTER_FLAG, LOWLETTER_FLAG }; QChar *verificationCode; QColor *colorArray; }; #endif // VERIFICATION_H
verification.cpp
#include "verification.h" #include <QTime> #include <QPaintEvent> Verification::Verification(QWidget *parent) :QFrame(parent) { //生成随机种子 qsrand(QTime::currentTime().second() * 1000 + QTime::currentTime().msec()); // m_captcha = getVerificationCode(); // m_color = getColor(); // m_timer.start(200); colorArray = new QColor[letter_number]; verificationCode = new QChar[letter_number]; m_captcha = getVerificationCodes(); } Verification::~Verification() { } ification::getVerificationCodes() const { QString s =""; QChar cTemp; for (int i = 0; i < letter_number; ++i) { cTemp = verificationCode[i]; s += cTemp>97?cTemp.toUpper():cTemp; } return s; } QChar Verification::produceRandomLetters() const { QChar c; int flag = qrand() % letter_number; switch (flag) { case NUMBER_FLAG:c='0' + qrand() % 10; break; case UPLETTER_FLAG:c='A' + qrand() % 26; break; case LOWLETTER_FLAG:c='a' + qrand() % 26; break; default:c=qrand() % 2 ? 'W' : 'D'; } return c; } void Verification::produceVerificationCodes() const { for (int i = 0; i < letter_number; ++i) verificationCode[i] = produceRandomLetters(); } void Verification::produceRandomColors() const { for (int i = 0; i < letter_number; ++i) colorArray[i] = QColor(qrand() % 255, qrand() % 255, qrand() % 255); } void Verification::Timer_Timeout() { // m_captcha = getVerificationCode(); m_captcha = getVerificationCodes(); // this->repaint(); this->update(); } QString Verification::getCaptcha() { return getVerificationCodes(); } void Verification::paintEvent(QPaintEvent *event) { painter(this); QPoint p; //背景设为白色 painter.fillRect(this->rect(), Qt::white); //产生4个不同的字符 produceVerificationCodes(); //产生4个不同的颜色 produceRandomColors(); //绘制验证码 for (int i = 0; i < letter_number; ++i) { p.setX(i*(this->width() / letter_number)+this->width()/14); p.setY(this->height() / 1.5); painter.setPen(colorArray[i]); painter.drawText(p, QString(verificationCode[i])); } return; }
三、在主函数里面添加如下代码:
**.h
Verification *verification;
**.cpp
void VLoginDlg::on_btnClick_clicked() //点击更新验证码 { verification->Timer_Timeout(); }
运行效果图
当点击最右端按钮时,验证码会自动刷新
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