How can I POST data to a url using QNetworkAccessManager
I have a webservice that I need to POST some data to using Qt. I figured that I can use a QByteArray when POSTing to the web service.
My question is, how can I format this array in order to be parsed correctly at the other end?
This is the code I have so far:
// Setup the webservice url
QUrl serviceUrl = QUrl("http://myserver/myservice.asmx");
QByteArray postData;
/*
Setup the post data somehow
I want to transmit:
param1=string,
param2=string
*/
// Call the webservice
QNetworkAccessManager *networkManager = new QNetworkAccessManager(this);
connect(networkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(serviceRequestFinished(QNetworkReply*)));
networkManager->post(开发者_高级运维QNetworkRequest(serviceUrl), postData);
Thanks!
Since some parameters and values might need to be utf-8 and percent encoded (spaces, &, =, special chars...), you should rather use QUrl
(for Qt 4) or QUrlQuery
(for Qt 5) to build the posted string.
Example code for Qt 4:
QUrl postData;
postData.addQueryItem("param1", "string");
postData.addQueryItem("param2", "string");
...
QNetworkRequest request(serviceUrl);
request.setHeader(QNetworkRequest::ContentTypeHeader,
"application/x-www-form-urlencoded");
networkManager->post(request, postData.encodedQuery());
and for Qt 5:
QUrlQuery postData;
postData.addQueryItem("param1", "string");
postData.addQueryItem("param2", "string");
...
QNetworkRequest request(serviceUrl);
request.setHeader(QNetworkRequest::ContentTypeHeader,
"application/x-www-form-urlencoded");
networkManager->post(request, postData.toString(QUrl::FullyEncoded).toUtf8());
Starting with Qt 4.8 you can also use QHttpMultiPart if you need to upload files.
I used:
QByteArray postData;
postData.append("param1=string&");
postData.append("param2=string");
So & instead of newline after each parameter.
Updating alexisdm answer to Qt5:
// Setup the webservice url
QUrl serviceUrl = QUrl("http://your.url");
QByteArray postData;
QUrlQuery query;
query.addQueryItem("param1","string1");
query.addQueryItem("param2","string2");
postData = query.toString(QUrl::FullyEncoded).toUtf8();
// Call the webservice
QNetworkAccessManager *networkManager = new QNetworkAccessManager(this);
connect(networkManager, SIGNAL(finished(QNetworkReply*)),
SLOT(onPostAnswer(QNetworkReply*)));
QNetworkRequest networkRequest(serviceUrl);
networkRequest.setHeader(QNetworkRequest::ContentTypeHeader,"application/x-www-form-urlencoded");
networkManager->post(networkRequest,postData);
Don't forget to include
QT += network
in .pro.
the actually answer is
QByteArray postData;
postData.append("param1=string&");
postData.append("param2=string");
NOTE: use "&" here!!!.
I didn't notice Juha's answer here, and waste much time on testing my code using the ",\n" approach.
Please change the correct answer to Juha's.
Here is another way to handle this, i am using your code also to give a complete code:
// Setup the webservice url
QUrl serviceUrl = QUrl("http://myserver/myservice.asmx");
QByteArray postData;
QUrl params;
params.addQueryItem("param1","string1");
params.addQueryItem("param2","string2");
postData = params.encodedQuery();
// Call the webservice
QNetworkAccessManager *networkManager = new QNetworkAccessManager(this);
connect(networkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(serviceRequestFinished(QNetworkReply*)));
networkManager->post(QNetworkRequest(serviceUrl), postData);
QByteArray postData;
postData.append("param1=string,\n");
postData.append("param2=string\n");
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