Comments by Salvatore Terress (Top 15 by date)

this is turning into "try this..."

( I should have posted this in "discussion"... but then I would get
" do not post Qt questions here..." )

here is the QProcess (!) implementation , obviously wrong...

it does what it should - just "echo" the command line
QProcess *QP = new QProcess();
QP->start(" echo q | sudo -S hcitool info 98:D3:31:F8:39:33 ") ;
if(QP->waitForStarted())
{
text = "SUCCESS started";
ui->textEdit->append(text);
qDebug() << text;
if(QP->waitForReadyRead())
{ text = "SUCCESS waitForReadyRead() OK ";
ui->textEdit->append(text);
qDebug() << text;
text = QP->readAllStandardOutput();
ui->textEdit->append(text);
qDebug() << text;
}
}
else
{
text = " FAILED start ";

}
qDebug() << text;
return;

Thanks for all replies and since
I am not allowed to ask Qt questions
CASE CLOSED

Here is my attempt to use "popen"

char s[5000];
char cmd[64]="echo q | sudo -S hcitool info 98:D3:31:F8:39:33";
FILE* pip=popen(cmd,"r");
fgets(s,5000,pip);

qDebug() << s;
return;

result:
I no longer get "connected" response from remote Bluetooth device
I get "disconnected" after few seconds

my "output" is limited to ONE line
[sudo] password for nov25-1: Requesting information ...

using "system" it took over 20 seconds for completion (expected _)

it definitely looks as "popen" terminates BEFORE remote device is finished responding.

not sure how to fix this , perhaps I have to give up and use QProcess

..so I cannot avoid to use "file "
and I can use both " | > "...
if "system" has no knowledge of "result"
how will it have knowledge if I use QFile resultFile;?
" | > resultFile "

Are you saying that "QString result" is a file , hence I need to treat (read) it as a file?
OK I did redirect to this "file"...and than lost the output to stdout AKA console..
but why using "| > " also removed the output to console?

...the question is about how to process "system" call...
(I want to learn something as I code...)
I do not know how (want) to option QtProcess with such complex setting.
Besides "system" is more KISS (IMHO)

I found this
QMetaMethod metaMethod = sender()->metaObject()->method(senderSignalIndex());
I really do not know HOW it works, but it manages to access senderSignalIndex , but the index returned does not make sense... so part of the problem is solved.. I will RTFM about QMetaMethod next...

Just update
I have this (working( example of single list I will try to adapt to "two level " list array

// test
QStringList fonts = { "Arial", "Helvetica", "Times" };
for (int i = 0; i < fonts.size(); ++i)
{
cout << fonts.at(i).toLocal8Bit().constData() <

Unfortunately that is not what I need - I need size , # , of members in subarray.
That is why I asked if my array definition is correct.

for(int TEST = 0; TEST < 5; TEST++)
{
text = " test ARRAY size TEST ";
text += QString::number (TEST );
text += " ";
text += QString::number (list_array[TEST][0].size());
text += " sizeof ";
text += QString::number (sizeof (list_array[TEST][0]));

qDebug() << text;
}

Output of code above:

" test ARRAY size TEST 0 39 sizeof 8"
" test ARRAY size TEST 1 49 sizeof 8"
" test ARRAY size TEST 2 34 sizeof 8"
" test ARRAY size TEST 3 49 sizeof 8"
" test ARRAY size TEST 4 39 sizeof 8"

I do not need grep to find these symbols...

I agree it may be something as Doxygen
and if I know that I will be able to find what is their function.