1

我想在wlan从静态notificationCallBack函数注册连接时发出信号。

代码：

无线连接.h

static void WINAPI notificationCallBack(PWLAN_NOTIFICATION_DATA wlanData, PVOID context);

无线连接.cpp

DWORD dwResult = 0;
dwResult = WlanRegisterNotification(hClient, WLAN_NOTIFICATION_SOURCE_ALL, TRUE, notificationCallBack, NULL, NULL, &dwPrevNotif);

void WINAPI WirelessConnect::notificationCallBack(PWLAN_NOTIFICATION_DATA wlanData, PVOID context)
{
    context = NULL;
    switch (wlanData->NotificationCode) {
        case wlan_notification_acm_connection_complete:
            emit apConnectionComplete();
            qDebug() << "Connected!";
        break;

        case wlan_notification_acm_connection_attempt_fail:
            emit apConnectionFailed();
            qDebug() << "Failed!";
        break;

        default:
            break;
    }
}

测试.cpp：

WirelessConnect *wirelessAPConnect = new WirelessConnect();
connect(wirelessAPConnect, &WirelessConnect::apConnectionComplete, setAPConnection);
connect(wirelessAPConnect, &WirelessConnect::apConnectionFailed, setAPConnectionFailed);

问题是error: C2355: 'this': can only be referenced inside non-static member functions or non-static data member initializers。

那么如何从static函数中发出信号，例如QMessageBox在课堂上显示有关 wlan 连接的信息Test？

上面链接中的解决方案不起作用：

1 方法：notificationCallBack(PWLAN_NOTIFICATION_DATA wlanData, PVOID context)函数只需要2个参数PWLAN_NOTIFICATION_DATA wlanData，PVOID context而不是对类的引用作为参数

2 方法：导致错误：C3867: 'WirelessConnect::apConnectionComplete': non-standard syntax; use '&' to create a pointer to member在连接中： connect(wirelessAPConnect, WirelessConnect::apConnectionComplete, this, &Test::setAPConnection);

我已经用 2 方法修复了编译错误，但它什么也没发出。

代码：

无线连接.cpp

static WirelessConnect wirelessConnectObj;

void WINAPI WirelessConnect::notificationCallBack(PWLAN_NOTIFICATION_DATA wlanData, PVOID context)
{
    context = NULL;
    switch (wlanData->NotificationCode) {
        case wlan_notification_acm_connection_complete:
            wirelessConnectObj.apConnectionComplete();
            qDebug() << "Connected!";
        break;

        case wlan_notification_acm_connection_attempt_fail:
            wirelessConnectObj.apConnectionFailed();
            qDebug() << "Failed!";
        break;

        default:
            break;
    }
}

dwResult = WlanRegisterNotification(hClient, WLAN_NOTIFICATION_SOURCE_ALL, TRUE, notificationCallBack, NULL, NULL, &dwPrevNotif);

测试.cpp

WirelessConnect *wirelessAPConnect = new WirelessConnect();
connect(wirelessAPConnect, &WirelessConnect::apConnectionComplete, this, &Test::setAPConnection);
connect(wirelessAPConnect, &WirelessConnect::apConnectionFailed, this, &Test::setAPConnectionFailed);

没有编译错误并且setAPConnection不执行。

我认为static WirelessConnect wirelessConnectObj;是 NULL 并且它什么也不执行。当我使用静态 WirelessConnect *wirelessConnectObj; 作为应用程序连接到接入点后的指针，然后应用程序崩溃。

初始化static WirelessConnect *wirelessConnectObj = new WirelessConnect();应用程序时工作但没有信号/插槽执行。

编辑：

WirelessConnectwlan类还管理连接到信号和槽的其他非静态函数。所以我不能删除wirelessAPConnect对象而只使用静态对象。我也初始化static WirelessConnect wirelessConnectObj;并Test连接它：

connect(&wirelessConnectObj, &WirelessConnect::apConnectionComplete, this, &Test::setAPConnection);
connect(&wirelessConnectObj, &WirelessConnect::apConnectionFailed, this, &Test::setAPConnectionFailed);

输出是一样的——什么都没有。我认为，这是因为我创建了 2 个不同的静态WirelessConnect类实例。我只需要一个静态实例，WirelessConnect它应该是全局的，可以发送信号并将它们连接到Test.

4

1 回答 1

1

我已经解决了这个问题：

我设置this了功能：

WlanRegisterNotification(hClient, WLAN_NOTIFICATION_SOURCE_ALL, TRUE, notificationCallBack, this, NULL, &dwPrevNotif);

void WINAPI WirelessConnect::notificationCallBack(PWLAN_NOTIFICATION_DATA wlanData, PVOID context)
{
    WirelessConnect *pThis = (WirelessConnect*) context;
    switch (wlanData->NotificationCode) {
        case wlan_notification_acm_connection_complete:
            pThis->apConnectionComplete();
            qDebug() << "Connected!";
        break;

        case wlan_notification_acm_connection_attempt_fail:
            pThis->apConnectionFailed();
            qDebug() << "Failed!";
        break;

        default:
            break;
    }
}

然后将其连接为非静态实例：

connect(wirelessAPConnect, &WirelessConnect::apConnectionComplete, this, &Test::setAPConnection); 
connect(wirelessAPConnect, &WirelessConnect::apConnectionFailed, this, &Test::setAPConnectionFailed);

所以我不再需要静态全局实例，它现在可以工作了。

编辑：

经过一些诊断（从接入点连接/断开连接）后，该解决方案导致应用程序崩溃。

于 2017-09-19T10:09:41.193 回答