from c++ to pyqt4 QByteArray

[alrawab]

hi i have this block of code in c++ how to convert it to pyqt4

virtual QByteArray myMapper() const {
assert(0); return QByteArray(256, 0);
}

const QByteArray& sequence = QByteArray("ABCDESFGTTTTTT");
const char* opq = sequence.data() +55;
QByteArray map =myMapper() ;

for(int i=0;i< sequence.size(); i++) {
char rdf= opq[i];
char cl = map.at(rdf)

}

[amleto]

is it your intention that this pointer

const char* opq = sequence.data() +55;

be invalid? It points to memory outside of the string - you are later reading random memory addresses...

This also looks nonsensical

for(int i=0;i< sequence.size(); i++) {
  char rdf= opq[i];
  char cl = map.at(rdf)
}

for(int i=0;i< sequence.size(); i++) {
  char rdf= opq[i];
  char cl = map.at(rdf)
}

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[alrawab]

is it your intention that this pointer

const char* opq = sequence.data() +55;

be invalid? It points to memory outside of the string - you are later reading random memory addresses...

This also looks nonsensical

for(int i=0;i< sequence.size(); i++) {
  char rdf= opq[i];
  char cl = map.at(rdf)
}

for(int i=0;i< sequence.size(); i++) {
  char rdf= opq[i];
  char cl = map.at(rdf)
}

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i know im concern the conversion and 55 is an example for any int
this is the real code
const QByteArray& sequence = detView->getSequenceContext()->getSequenceData();
const char* seq = sequence.data() + detView->getVisibleRange().startPos;

DNATranslation* complTrans = detView->getComplementTT();
QByteArray map = complTrans->getOne2OneMapper();
int y = getTextY(complementLine);
for(int i=0;i< visibleRange.len; i++) {
char nucl = seq[i];
char complNucl = map.at(nucl);
}

[amleto]

sigh. Next time please be more wary of wasting people's time with nonsense code. Also use code tags!
I still don't understand what this is meant to be doing

char nucl = seq[i];
char complNucl = map.at(nucl); // map.at takes an int - why is a char being passed here?  You get trouble if char is signed and a negative number...

char nucl = seq[i];
char complNucl = map.at(nucl); // map.at takes an int - why is a char being passed here?  You get trouble if char is signed and a negative number...

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def myMapper(self):
  return QByteArray(256, 0)
 
sequence = QByteArray("ABCDESFGTTTTTT")
some_sensible_number = 3 # this is just an example...
opq = sequence.mid(some_sensible_number).data()
map = myMapper()
 
for i in range(__visible_range__): # visible range, not sequence.size() as you tried to fool us with
  rdf = opq.at(i)
  cl = map.at(ord(rdf)) # guessing ord is ok, might not be

def myMapper(self):
  return QByteArray(256, 0)

sequence = QByteArray("ABCDESFGTTTTTT")
some_sensible_number = 3 # this is just an example...
opq = sequence.mid(some_sensible_number).data()
map = myMapper()

for i in range(__visible_range__): # visible range, not sequence.size() as you tried to fool us with
  rdf = opq.at(i)
  cl = map.at(ord(rdf)) # guessing ord is ok, might not be

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[wysota]

hi i have this block of code in c++ how to convert it to pyqt4

virtual QByteArray myMapper() const {
assert(0); return QByteArray(256, 0);
}

const QByteArray& sequence = QByteArray("ABCDESFGTTTTTT");
const char* opq = sequence.data() +55;
QByteArray map =myMapper() ;

for(int i=0;i< sequence.size(); i++) {
char rdf= opq[i];
char cl = map.at(rdf)

}

Maybe you should start by explaining what your code is supposed to be doing at all? I can see this is related to encoding some DNA sequence but as it was already said, the code doesn't make much sense.

[alrawab]

thanks amleto
as you tried to fool us with => its an example i will handle the real range
the problem is when you do
map = myMapper()
you will get this error in python :

return QByteArray(256, 0)
TypeError: arguments did not match any overloaded call:
QByteArray(): too many arguments
QByteArray(int, str): argument 2 has unexpected type 'int'
QByteArray(QByteArray): argument 1 has unexpected type 'int'

[wysota]

Try passing '\0' as the second argument to the constructor.

[alrawab]

its pyqt4 realated so can you solve this
why i got such a message
return QByteArray(256, 0)
TypeError: arguments did not match any overloaded call:
QByteArray(): too many arguments
QByteArray(int, str): argument 2 has unexpected type 'int'
QByteArray(QByteArray): argument 1 has unexpected type 'int'

[wysota]

I already told you, the constructor for the byte array expects a string instead of an int as its second argument. You have all you need in the error message.