QNetworkaccessmanager - post

toho71

Hello
When i try to figure out how to use this QNAM and post I Tried this.

I will fill the bytearray with some id (Numeric) and make it as a list.

It works with one value but not with 2 or more and I recive an Unkown error in all of my cases.

Where is the missing part.

The contact to the url-- is all right

I fill up the bytearray in a loop
@ QByteArray postData;

for (int i = 0; i < selectedToAck.size(); ++i)
{

postData.append("m_iFuelSensor=");
postData.append(model->item(index.row(),0)->data(Qt::DisplayRole).toString());@

@/*

connection();
param postdata- bytearray
try to do a form post with QNetworkAccessmanager
*/
void Logs::connection( QByteArray postData)
{

manager = new QNetworkAccessManager(this);
connect(manager, SIGNAL(finished(QNetworkReply*)),this, SLOT(finishedSlot(QNetworkReply*)));

QUrl url(globalP->getGCUUrl() + "/fuelParams.htm? ");
reply = manager->post(QNetworkRequest(url),postData);

}

/*

finishedSlot();
param replay- QNetworkReply
answer of the post metchod
/
void Logs::finishedSlot(QNetworkReply reply)
{

QVariant statusCodeV = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute );

QMessageBox msgBox;
QVariant tempQ = QVariant(statusCodeV.toString());
msgBox.setText(tempQ.toString() + " " + reply->errorString());
int ret = msgBox.exec();

// "200 OK" received?
if (statusCodeV.toInt()==200)
{
```
 msgBox.setText("Successfull!...");
 int ret = msgBox.exec&#40;&#41;;

 QByteArray bytes = reply->readAll(); // bytes
 const QString string(bytes); // string

 QMessageBox msgBox;
 msgBox.setText(string );
 msgBox.exec&#40;&#41;;
```
}

else
{
msgBox.setText("UnSuccessfull!...");
int ret = msgBox.exec();
}

selectedToAck.clear();
setActiveAlarms();

delete reply;
delete manager;

}
@

dangelog

Was your loop truncated or you're missing the "&" to join the arguments?

Also: don't do that by hand. Use QUrl to build the query string, or QHttpMultipart.

toho71

I didn't get that either to work properly.
Do you have an example of that

toho71

I even got this in the debugwindow

bq. X Error: BadWindow (invalid Window parameter) 3
Major opcode: 15 (X_QueryTree)
Resource id: 0x165b0ef
X Error: BadWindow (invalid Window parameter) 3
Major opcode: 40 (X_TranslateCoords)
Resource id: 0x165b0ef
X Error: BadWindow (invalid Window parameter) 3
Major opcode: 15 (X_QueryTree)
Resource id: 0x165c579
X Error: BadWindow (invalid Window parameter) 3
Major opcode: 40 (X_TranslateCoords)
Resource id: 0x165c579
X Error: BadWindow (invalid Window parameter) 3
Major opcode: 15 (X_QueryTree)
Resource id: 0x165e494
X Error: BadWindow (invalid Window parameter) 3
Major opcode: 40 (X_TranslateCoords)
Resource id: 0x165e494

fluca1978

In your (truncated) for cycle you are assigning the same parameter multiple times. Is that what you really want to achieve? I believe you want to concat the values into a single variable.

toho71

i want to post
postData.append("m_iFuelSensor=") ;// Value
as a list to the server.

it could be one or many values
not as a singel variabel;

fluca1978

@ QByteArray postData;
postData.append("m_iFuelSensor=");
for (int i = 0; i < selectedToAck.size(); ++i)
postData.append(model->item(index.row(),0)->data(Qt::DisplayRole).toString());
@

toho71

No "?" ?
Because now all the values are in the variabel and its gonna be a big number.
Shouldn't i have some sort of delimiter maybe

toho71

More errors
I got the errorcode 302 unknown error when i do my post but it changes the value in the textbox.
if I send one value.
When i changed to get operation I got the errorcode 200 "OK"
If someone have a simple example to show or some great hints to get me go on with this "Problem"
I would be very happy.

fluca1978

[quote author="toho71" date="1324472734"]No "?" ?
Because now all the values are in the variabel and its gonna be a big number.
Shouldn't i have some sort of delimiter maybe[/quote]

You are right, at each iteration you have to add a delimiter.

toho71

Ok thank you but it still doesn't work as i expected.
Same problems and no update of the webpage.
Maybe I have to do it in another way becaus when I use ex. Wireshark I dont see the incoming values in my postoperation.
Strange.

fluca1978

What if you try to make a GET request? Just to see if the data is sent or not.

toho71

I got the errorcode 302 unknown error when i do my post but it changes the value in the textbox when i update the webpage and if I send one value?

When i changed to get operation I got the errorcode 200 == “OK”

fluca1978

I would start doing a post request with another tool, let say wget, and see how the request must be done and then reproduce it in Qt.

toho71

This can't be a problem in qt but I don't know how to do it properly.

It must be someone else who have done this before.

Maybe I have to use Qhttp instead

goetz

[quote author="toho71" date="1324560334"
Maybe I have to use Qhttp instead
[/quote]

You will run into the very same problems with constructing the URL and/or preparing the post data. You will need to understand HTTP protocol basics before using it in a class.

toho71

I'm sorry but after reading more about this subject I'm still not able to go further so If some nice person would tell me a little more how to take the next step so I got this code working with Post request it would be great.

fluca1978

Do you have the exact list of parameters as they have to be sent to the server to perform a correct post request? How is your code working now and what is the exact problem?

toho71

I have a list in a table and when I check (Chkbox) some rows in that table I got a list of numbers that I want to post to a list on the server. It works with one value when I refresh the browserwindow but not with more values.

//T

fluca1978

I suspect your cgi/web application does not allow you to set multiple values at once, or has a special formatting for such values. Do you have the specifics of the parameters your web application is accepting? Otherwise you have to guess and try.