#include "comchange.h"
#include <QApplication>
#include <QMutex>
#include <QSerialPort>
#include <QSerialPortInfo>
#include <qdebug.h>
#ifdef Q_OS_WIN
#include <windows.h>
#include "dbt.h"
#pragma comment(lib, "user32.lib")
#endif

ComChange* ComChange::m_comChange = nullptr;
ComChange *ComChange::getInstance()
{
 if(m_comChange == nullptr)
 {
 static QMutex mutex; //实例互斥锁。
 QMutexLocker locker(&mutex); //加互斥锁。
 if(m_comChange == nullptr)
 {
 m_comChange = new ComChange();
 }
 }
 return m_comChange;

}

/**
 * @brief 获取系统中所有可用的串口名
 * @return
 */
QStringList ComChange::getAvailablePort()
{
 QStringList strName;
 foreach(const QSerialPortInfo& info, QSerialPortInfo::availablePorts())
 {
 QSerialPort port(info);
 if(port.open(QIODevice::ReadWrite))
 {
 strName << info.portName();
 port.close();
 }
 }
 return strName;
}


/**
 * @brief 设置窗口句柄用于过滤事件
 * @param hwnd
 */
void ComChange::setWid(quintptr wid)
{
 m_wid = wid;
}


ComChange::ComChange(QObject *parent) : QObject(parent)
{
 qApp->installNativeEventFilter(this); // 安装事件过滤器

}

bool ComChange::nativeEventFilter(const QByteArray &eventType, void *message, long *result)
{
#ifdef Q_OS_WIN
 Q_UNUSED(result)
 if(eventType == "windows_generic_MSG") // 处理windows消息
 {
 MSG* msg = reinterpret_cast<MSG*>(message);

 if(msg->message == WM_DEVICECHANGE // 通知应用程序设备或计算机的硬件配置发生更改。
 && msg->hwnd == (HWND)this->m_wid) // 过滤事件
 {
 PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)msg->lParam;
 switch (msg->wParam)
 {
 case DBT_DEVICEARRIVAL: // 插入
 {
 if (lpdb->dbch_devicetype == DBT_DEVTYP_PORT) // 设备类型为串口
 {
 PDEV_BROADCAST_PORT lpdbv = (PDEV_BROADCAST_PORT)lpdb;
 QString strName = QString::fromWCharArray(lpdbv->dbcp_name); //插入的串口名
 emit comStatus(strName, true);
 }
 break;
 }
 case DBT_DEVICEREMOVECOMPLETE: // 拔出
 {
 if (lpdb->dbch_devicetype == DBT_DEVTYP_PORT) // 设备类型为串口
 {
 PDEV_BROADCAST_PORT lpdbv = (PDEV_BROADCAST_PORT)lpdb;
 QString strName = QString::fromWCharArray(lpdbv->dbcp_name); //拔出的串口名
 emit comStatus(strName, false);
 }
 break;
 }
 default:
 break;
 }
 }
 }
#endif

 return false;
}