Qt之AVI录屏

/******** CScreenShot.h **************/
#ifndef __CSCREENSHOT_H
#define __CSCREENSHOT_H

#include 
#include 
#include 
#include 
#include 
#define CollectGarbage(className) class className##Collect{ public: ~className##Collect(){ if ( NULL != instance ){delete instance;instance = NULL;}}}; static className##Collect GarCollect;
class CScreenShot : public QThread
{
    Q_OBJECT
public:
    ~CScreenShot();
    static CScreenShot* getSingletonInstance();   ///< 单例
    void setControl(bool bStop);
    void getPixMap(const QPixmap& pix);
protected:
    void run();
private:
    Q_DISABLE_COPY(CScreenShot);
    CollectGarbage(CScreenShot);
    CScreenShot();
    static CScreenShot* instance;
    bool m_bStop;
    char* frameBuffer;
    QPixmap m_pix;
    QMutex mutex;
    QWaitCondition wait;
};
#endif// cscreenshot.h

/******** CScreenShot.cpp **************/
#ifdef __cplusplus
extern "C"
{
#include  // avilib库的头文件
}
#endif
#include "CScreenShot.h"
#include 
#include 
#include 
#include 
#include 
#include 
CScreenShot* CScreenShot::instance = NULL;
CScreenShot* CScreenShot::getSingletonInstance()
{
    if(instance == NULL)
    {
        instance = new CScreenShot();
    }
    return instance;
}
CScreenShot::CScreenShot() :m_bStop(false)
{
}
CScreenShot::~CScreenShot(){}

void CScreenShot::getPixMap(const QPixmap& pix){
    m_pix = pix.scaled(400,300);
    wait.wakeOne();// 获取一次图片就唤醒一次线程，制作视频
}
void CScreenShot::run(){
    QString tmpFile= QDir::currentPath() + "/" + QDateTime::currentDateTime().toString("hhmmss")+".avi";
    QByteArray byte = tmpFile.toUtf8();
    char* filename = byte.data();//以当前时间定义文件名和路径
    avi_t* out_fd = AVI_open_output_file(filename); //把文件描述符绑定到此文件上
    if(out_fd == NULL){ return;}
    AVI_set_video(out_fd,160,120,70,"MJPG");//设置视频文件的格式
    int keyfame = 1;
    while(!m_bStop)
    {
        QMutexLocker lock(&mutex);
        wait.wait(&mutex); // 等待新的图片过来
        QByteArray frame;
        QBuffer buffer(&frame);
        buffer.open(QIODevice::WriteOnly);
        m_pix.save(&buffer, "jpg"); 
        //m_pix.save(QDateTime::currentDateTime().toString("hhmmss") + ".jpg","jpg");
        if(frame.data() != NULL && frame.length() !=0)
        {
            if(AVI_write_frame(out_fd,frame.data(),frame.length(),keyfame) < 0) {}
            else{ keyfame = 0;}
        }
    }
   AVI_close(out_fd);
}
/** 在其他页面构建函数体内定时将当前centraLWidget页面截取传给线程处理成AVI视频即可 **/
    mytimer = new QTimer(this);
    mytimer->setInterval(150);
    mytimer->start();
    CScreenShot::getSingletonInstance()->start();
    connect(mytimer, &QTimer::timeout,this,[&](){
    if (!mytimer->isActive()){mytimer->start();}
    QPixmap pix = QPixmap::grabWindow(CentralWidget->winId());// Qt 4.x就用这个方法，这里为了少写个函数用lambda表达式替代。
    CScreenShot::getSingletonInstance()->getPixMap(pix);});
}

资料：
Avilib库文件链接
qt超易实现录屏程序的方法
Qt5和Qt4的简单截屏