QHttp::dataSendProgress transfer speed Kb sec.

[patrik08]

Have you taken into consideration that the size pos() returns doesn't mean the position of the stream being sent but rather the one being read from the file? There is also some amount of data that is currently buffered along the way (file buffer, socket buffer, system buffer, NIC buffer, possibly more).

I suppose QIODevice read fast or not fast in to speed tat socket can send....
on dataSendProgress(int done , int) on done is 3% the same value as QIODevice :: pos() at end is the same .... but QIODevice :: pos() go moore as 2GB....


And How calculate you the Time to complete upload? && Speed?

[wysota]

And How calculate you the Time to complete upload? && Speed?

speed = (length*percentage_completed) / time_elapsed
time remaining = (1 - percentage_completed) * length/speed or 100*(1-percentage_completed)*time_elapsed
percentage_completed = done/total (taken from QHttp progress signals)

division used here (/) is a floating point operator.

Example:

length = 1000000B
time_elapsed = 5s
done = 1000
total = 100000

hence:
percentage_completed = 0.01 (=10000B)
speed = (10^6*10^-2)/5s = 10000/5 = 2000B/s
time remaining = (1-0.01) * 10^6/2000 = 0.99 * 500 = 495s
time remaining (alternative) = 100 * 0.99 * 5 = 99 * 5 = 495s


BTW. 1% * 3GB = 3MB - buffers are not that large therefore you won't notice a difference with such big values here. But if you try sending a small file (100kB) through an extremely slow link, the file read buffer and socket write buffer positions might be quite different.

[patrik08]

speed = (length*percentage_completed) / time_elapsed

division used here (/) is a floating point operator.
different.

double can go to .arg(22.22) or accept .arg float as double?
not run....
QString str = QString("speed Kb/s: %1").arg(d, 0, 'f', 0);

How can .arg() print only 2 decimal??
QChar & fillChar 0

double d = 12.34;
 QString str = QString("delta: %1").arg(d, 0, 'E', 3);
 // str == "delta: 1.234E+01"

double d = 12.34;
 QString str = QString("delta: %1").arg(d, 0, 'E', 3);
 // str == "delta: 1.234E+01"

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[wysota]

I don't understand the question.

[patrik08]

I don't understand the question.

How display decimal numer on .arg ....?

double nummer = .33 ;

QString("Cent: %1").arg(nummer); /* comming 0 */

QString str = QString("delta: %1").arg(d, 0, 'E', 3);
i am confused on E g f..... i can only display decimal point on console app...
and i like display double nummer = .33 on .arg() ....

[wysota]

Are you sure "nummer" is double? Or maybe you're using a comma instead of a dot while initialising the variable?

The following:

#include <QString>
#include <QtDebug>
 
int main(){
  qDebug() << QString("Value: %1").arg((double).33);
  return 0;
}

#include <QString>
#include <QtDebug>

int main(){
  qDebug() << QString("Value: %1").arg((double).33);
  return 0;
}

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returns:

"Value: 0.33"

[patrik08]

Are you sure "nummer" is double? Or maybe you're using a comma instead of a dot while initialising the variable?

The following:

#include <QString>
#include <QtDebug>
 
int main(){
  qDebug() << QString("Value: %1").arg((double).33);
  return 0;
}

#include <QString>
#include <QtDebug>

int main(){
  qDebug() << QString("Value: %1").arg((double).33);
  return 0;
}

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returns:

is a float speed kbs .... convertet on double the first value .... why? .... on wayting the first second to calculate the speed upload..... to display speed each millisecond break my eyes && compiler... ... and i print only speed each sec. much tanks...