再会
介绍:
我的应用程序需要获取外部 IP 地址并将其与内部获取的地址匹配,从而允许应用程序继续进行。
为此,我为此使用了QNetworkAccessManager和QNetworkReply。
我的代码是使用此示例作为参考构建的。
我试过的:
获取外部 IP 可以通过从ipify API获取 JSon 对象来完成。
我通过以下方式证实了这一点:
curl "https://api.ipify.org?format=json"
它反过来以我当前的 IP 地址响应格式:
{"ip":"255.255.255.255"}
这是一个 JSONObject。使用它,我创建了下面的代码。
问题:
问题很简单,我没有反应。post
请求被执行,但根本没有触发响应(或)finished
信号。
POST
->GET
请求
我已经更改了get
请求的代码,因为这解决了这个线程上的无响应问题。
我通过在 URL 中使用查询参数指定整个 url 来做到这一点:
QNetworkRequest request(QUrl("https://api.ipify.org?format=json"));
包括标题内容类型和大小(如下例所示,最后调用QNetworkAccessManager::get()
with:
replyExternalAddress = networkManager->get(request);
但这也没有回应。
我认为这是我想念的小东西,但我根本看不到它。
建议?
查询外网IP代码:
// public callable method, starting network request
void APICommunicator::requestExternalAddress(){
qInfo(apicommunicator) << "Requesting external IP address from ipify.org";
// creates network request
// specifies "format=json"
QUrlQuery postData;
postData.addQueryItem("format", "json");
QByteArray encodedQuery = postData.toString(QUrl::FullyEncoded).toUtf8();
QNetworkRequest request(QUrl("https://api.ipify.org"));
request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");
request.setHeader(QNetworkRequest::ContentLengthHeader, QString::number(encodedQuery.size()));
// creates merged URL from URL and query items and sends a post:
// https://api.ipify.org?format=json
replyExternalAddress = networkManager->post(request, encodedQuery);
// Creates QMetaObject::Connection connection for finished signal from QNetworkReply
conExternalAddress = QObject::connect(replyExternalAddress, SIGNAL(finished()), this, SLOT(externalAddressResponse()));
// attach error listener to reply
addErrorListener(replyExternalAddress, conExternalAddress);
}
void APICommunicator::externalAddressResponse(){
qDebug(apicommunicator) << "External Address response recieved";
// disconnect signals
QObject::disconnect(conExternalAddress);
QObject::disconnect(conErrorListener);
// read all output from JSon object
QByteArray ba = replyExternalAddress->readAll();
// delete QNetworkReply
replyExternalAddress->deleteLater();
LogMessageHandler::writeToApiLog(QString("\n\nCALL EXTERNAL [" + replyExternalAddress->request().url().toString() + "]\n" + QString(ba)));
QJsonObject doc = QJsonDocument::fromJson(ba).object();
QString ip = doc.value("ip").toString();
QHostAddress address = QHostAddress();
if (ip.isEmpty()) {
qWarning(apicommunicator) << "External Address: no data received";
}
else {
address = QHostAddress(version);
}
// replies with address to external slot (in main application)
emit ExternalAddressReply(address);
}