QT QImage使用方法（Qt学习1）

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参考链接：

1、http://blog.csdn.net/feiyangyangfei/article/details/8672748

Qt信号与槽以及图像在label缩放显示

//mysignal.h

#ifndef MYSIGNAL_H#define MYSIGNAL_H#include <QObject>#include <QString>#include <QImage>#include <QLabel>#include <QPixmap>#include <QPainter>#include <QMessageBox>class MySignal : public QObject{    Q_OBJECTpublic:    MySignal(QObject *parent);    ~MySignal();//槽public slots:    void MysetValue(int valueX);    bool MyloadImage(QString imagePath);    void MyShowImage(QLabel *showImageLabel);signals:    void MyClicked(int valueX);private:    int m_valueInt;    QImage m_ImageClass;};#endif // MYSIGNAL_H

//mysignal.cpp

#include "mysignal.h"MySignal::MySignal(QObject *parent)    : QObject(parent){    QObject::connect(this,SIGNAL(MyClicked(int)),this,SLOT(MysetValue(int)));    //QObject::connect(this,SIGNAL(MySignal(int,int)),this,SLOT(MySlot(int,int)));}MySignal::~MySignal(){}void MySignal::MysetValue(int valueX){    m_valueInt = valueX;    //emit MyClicked(valueX);容易死循环}bool MySignal::MyloadImage(QString imagePath){    if (imagePath.trimmed().isEmpty())        return false;    if (!m_ImageClass.load(imagePath))        return false;    QMessageBox::information(NULL,"Information","image load scuccess!",QMessageBox::Yes|QMessageBox::No);}void MySignal::MyShowImage(QLabel *showImageLabel){    QPixmap myPixmap;    QSize labelSize = showImageLabel->size();    QImage tepImage = m_ImageClass.scaled(labelSize);    myPixmap.convertFromImage(tepImage);    showImageLabel->setPixmap(myPixmap);}

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