how to convert QByteArray to Array in qt?
-4
i have a QByteArray variable like this:
QByteArray read= port->readAll();
now i want convert read to Array for write binary file like this:
int b = {}; // lengh of array is port->readAll() size
QFile myFile("e:/test/test.dat");
if(!myFile.open(QIODevice::WriteOnly))return;
myFile.write((char*)b,sizeof(int));
myFile.flush();
myFile.close();
c++ qt qbytearray
edited Nov 22 '18 at 16:57
Toby Speight
16.6k134065
asked Nov 22 '18 at 16:27
jocker fantomjocker fantom
144
|
show 1 more comment
-4
i have a QByteArray variable like this:
QByteArray read= port->readAll();
now i want convert read to Array for write binary file like this:
int b = {}; // lengh of array is port->readAll() size
QFile myFile("e:/test/test.dat");
if(!myFile.open(QIODevice::WriteOnly))return;
myFile.write((char*)b,sizeof(int));
myFile.flush();
myFile.close();
c++ qt qbytearray
edited Nov 22 '18 at 16:57
Toby Speight
16.6k134065
asked Nov 22 '18 at 16:27
jocker fantomjocker fantom
144
1
Why can't you usedata()for that - do you need it to outlive theQByteArray, or is there another reason? BTW, I really wouldn't use the namereadfor a variable - too similar to popular library or system call names.
– Toby Speight
Nov 22 '18 at 16:34
my problem is convert QByteArray to Array.
– jocker fantom
Nov 22 '18 at 16:39
2
Why do you need to, given that you can access the contents of theQByteArrayfor purposes such as the code you show? It's not at all obvious what you're trying to do that's not achieved bymyFile.write(read.data(), sizeof (int)). Or, if you meant to write the whole array,myFile.write(read.data(), read.size())or equivalently, justmyFile.write(read).
– Toby Speight
Nov 22 '18 at 16:43
i hav to read all data from modem: QByteArray read= port->readAll(); and write it
– jocker fantom
Nov 22 '18 at 16:51
So why can't you just pass theQByteArraytoQFile::write()as I've shown? It's still unclear why that won't work for you.
– Toby Speight
Nov 22 '18 at 16:56
|
show 1 more comment
-4
-4
-4
i have a QByteArray variable like this:
QByteArray read= port->readAll();
now i want convert read to Array for write binary file like this:
int b = {}; // lengh of array is port->readAll() size
QFile myFile("e:/test/test.dat");
if(!myFile.open(QIODevice::WriteOnly))return;
myFile.write((char*)b,sizeof(int));
myFile.flush();
myFile.close();
c++ qt qbytearray
edited Nov 22 '18 at 16:57
Toby Speight
16.6k134065
asked Nov 22 '18 at 16:27
jocker fantomjocker fantom
144
i have a QByteArray variable like this:
QByteArray read= port->readAll();
now i want convert read to Array for write binary file like this:
int b = {}; // lengh of array is port->readAll() size
QFile myFile("e:/test/test.dat");
if(!myFile.open(QIODevice::WriteOnly))return;
myFile.write((char*)b,sizeof(int));
myFile.flush();
myFile.close();
c++ qt qbytearray
c++ qt qbytearray
edited Nov 22 '18 at 16:57
Toby Speight
16.6k134065
asked Nov 22 '18 at 16:27
jocker fantomjocker fantom
144
edited Nov 22 '18 at 16:57
Toby Speight
16.6k134065
asked Nov 22 '18 at 16:27
jocker fantomjocker fantom
144
edited Nov 22 '18 at 16:57
Toby Speight
16.6k134065
edited Nov 22 '18 at 16:57
Toby Speight
16.6k134065
edited Nov 22 '18 at 16:57
Toby Speight
16.6k134065
16.6k134065
asked Nov 22 '18 at 16:27
jocker fantomjocker fantom
144
asked Nov 22 '18 at 16:27
jocker fantomjocker fantom
144
asked Nov 22 '18 at 16:27
jocker fantomjocker fantom
144
144
1
Why can't you usedata()for that - do you need it to outlive theQByteArray, or is there another reason? BTW, I really wouldn't use the namereadfor a variable - too similar to popular library or system call names.
– Toby Speight
Nov 22 '18 at 16:34
my problem is convert QByteArray to Array.
– jocker fantom
Nov 22 '18 at 16:39
2
Why do you need to, given that you can access the contents of theQByteArrayfor purposes such as the code you show? It's not at all obvious what you're trying to do that's not achieved bymyFile.write(read.data(), sizeof (int)). Or, if you meant to write the whole array,myFile.write(read.data(), read.size())or equivalently, justmyFile.write(read).
– Toby Speight
Nov 22 '18 at 16:43
i hav to read all data from modem: QByteArray read= port->readAll(); and write it
– jocker fantom
Nov 22 '18 at 16:51
So why can't you just pass theQByteArraytoQFile::write()as I've shown? It's still unclear why that won't work for you.
– Toby Speight
Nov 22 '18 at 16:56
|
show 1 more comment
1
Why can't you usedata()for that - do you need it to outlive theQByteArray, or is there another reason? BTW, I really wouldn't use the namereadfor a variable - too similar to popular library or system call names.
– Toby Speight
Nov 22 '18 at 16:34
my problem is convert QByteArray to Array.
– jocker fantom
Nov 22 '18 at 16:39
2
Why do you need to, given that you can access the contents of theQByteArrayfor purposes such as the code you show? It's not at all obvious what you're trying to do that's not achieved bymyFile.write(read.data(), sizeof (int)). Or, if you meant to write the whole array,myFile.write(read.data(), read.size())or equivalently, justmyFile.write(read).
– Toby Speight
Nov 22 '18 at 16:43
i hav to read all data from modem: QByteArray read= port->readAll(); and write it
– jocker fantom
Nov 22 '18 at 16:51
So why can't you just pass theQByteArraytoQFile::write()as I've shown? It's still unclear why that won't work for you.
– Toby Speight
Nov 22 '18 at 16:56
1
1
Why can't you use
data() for that - do you need it to outlive the QByteArray, or is there another reason? BTW, I really wouldn't use the name read for a variable - too similar to popular library or system call names.– Toby Speight
Nov 22 '18 at 16:34
Why can't you use
data() for that - do you need it to outlive the QByteArray, or is there another reason? BTW, I really wouldn't use the name read for a variable - too similar to popular library or system call names.– Toby Speight
Nov 22 '18 at 16:34
my problem is convert QByteArray to Array.
– jocker fantom
Nov 22 '18 at 16:39
my problem is convert QByteArray to Array.
– jocker fantom
Nov 22 '18 at 16:39
2
2
Why do you need to, given that you can access the contents of the
QByteArray for purposes such as the code you show? It's not at all obvious what you're trying to do that's not achieved by myFile.write(read.data(), sizeof (int)). Or, if you meant to write the whole array, myFile.write(read.data(), read.size()) or equivalently, just myFile.write(read).– Toby Speight
Nov 22 '18 at 16:43
Why do you need to, given that you can access the contents of the
QByteArray for purposes such as the code you show? It's not at all obvious what you're trying to do that's not achieved by myFile.write(read.data(), sizeof (int)). Or, if you meant to write the whole array, myFile.write(read.data(), read.size()) or equivalently, just myFile.write(read).– Toby Speight
Nov 22 '18 at 16:43
i hav to read all data from modem: QByteArray read= port->readAll(); and write it
– jocker fantom
Nov 22 '18 at 16:51
i hav to read all data from modem: QByteArray read= port->readAll(); and write it
– jocker fantom
Nov 22 '18 at 16:51
So why can't you just pass the
QByteArray to QFile::write() as I've shown? It's still unclear why that won't work for you.– Toby Speight
Nov 22 '18 at 16:56
So why can't you just pass the
QByteArray to QFile::write() as I've shown? It's still unclear why that won't work for you.– Toby Speight
Nov 22 '18 at 16:56
|
show 1 more comment
1 Answer
1
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0
No need to create int b = ..etc
Just use either the method QByteArray::data():
QFile file(...);
QByteArray byteArray = ...
...
file.write(byteArray.data(), byteArray.size());
Or you can set the QByteArray's object directly to file.write():
QFile file(...);
QByteArray byteArray = ...;
file.write(byteArray);
answered Nov 23 '18 at 12:06
Alexander CherninAlexander Chernin
30529
add a comment |
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No need to create int b = ..etc
Just use either the method QByteArray::data():
QFile file(...);
QByteArray byteArray = ...
...
file.write(byteArray.data(), byteArray.size());
Or you can set the QByteArray's object directly to file.write():
QFile file(...);
QByteArray byteArray = ...;
file.write(byteArray);
answered Nov 23 '18 at 12:06
Alexander CherninAlexander Chernin
30529
add a comment |
0
No need to create int b = ..etc
Just use either the method QByteArray::data():
QFile file(...);
QByteArray byteArray = ...
...
file.write(byteArray.data(), byteArray.size());
Or you can set the QByteArray's object directly to file.write():
QFile file(...);
QByteArray byteArray = ...;
file.write(byteArray);
answered Nov 23 '18 at 12:06
Alexander CherninAlexander Chernin
30529
add a comment |
0
0
0
No need to create int b = ..etc
Just use either the method QByteArray::data():
QFile file(...);
QByteArray byteArray = ...
...
file.write(byteArray.data(), byteArray.size());
Or you can set the QByteArray's object directly to file.write():
QFile file(...);
QByteArray byteArray = ...;
file.write(byteArray);
answered Nov 23 '18 at 12:06
Alexander CherninAlexander Chernin
30529
No need to create int b = ..etc
Just use either the method QByteArray::data():
QFile file(...);
QByteArray byteArray = ...
...
file.write(byteArray.data(), byteArray.size());
Or you can set the QByteArray's object directly to file.write():
QFile file(...);
QByteArray byteArray = ...;
file.write(byteArray);
answered Nov 23 '18 at 12:06
Alexander CherninAlexander Chernin
30529
answered Nov 23 '18 at 12:06
Alexander CherninAlexander Chernin
30529
answered Nov 23 '18 at 12:06
Alexander CherninAlexander Chernin
30529
answered Nov 23 '18 at 12:06
Alexander CherninAlexander Chernin
30529
30529
add a comment |
add a comment |
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1
Why can't you use
data()for that - do you need it to outlive theQByteArray, or is there another reason? BTW, I really wouldn't use the namereadfor a variable - too similar to popular library or system call names.– Toby Speight
Nov 22 '18 at 16:34
my problem is convert QByteArray to Array.
– jocker fantom
Nov 22 '18 at 16:39
2
Why do you need to, given that you can access the contents of the
QByteArrayfor purposes such as the code you show? It's not at all obvious what you're trying to do that's not achieved bymyFile.write(read.data(), sizeof (int)). Or, if you meant to write the whole array,myFile.write(read.data(), read.size())or equivalently, justmyFile.write(read).– Toby Speight
Nov 22 '18 at 16:43
i hav to read all data from modem: QByteArray read= port->readAll(); and write it
– jocker fantom
Nov 22 '18 at 16:51
So why can't you just pass the
QByteArraytoQFile::write()as I've shown? It's still unclear why that won't work for you.– Toby Speight
Nov 22 '18 at 16:56