how to convert QByteArray to Array in qt?
up vote
-4
down vote
favorite
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 at 16:57
Toby Speight
16.2k133965
asked Nov 22 at 16:27
jocker fantom
82
|
show 1 more comment
up vote
-4
down vote
favorite
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 at 16:57
Toby Speight
16.2k133965
asked Nov 22 at 16:27
jocker fantom
82
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 at 16:34
my problem is convert QByteArray to Array.
– jocker fantom
Nov 22 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 at 16:43
i hav to read all data from modem: QByteArray read= port->readAll(); and write it
– jocker fantom
Nov 22 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 at 16:56
|
show 1 more comment
up vote
-4
down vote
favorite
up vote
-4
down vote
favorite
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 at 16:57
Toby Speight
16.2k133965
asked Nov 22 at 16:27
jocker fantom
82
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 at 16:57
Toby Speight
16.2k133965
asked Nov 22 at 16:27
jocker fantom
82
edited Nov 22 at 16:57
Toby Speight
16.2k133965
asked Nov 22 at 16:27
jocker fantom
82
edited Nov 22 at 16:57
Toby Speight
16.2k133965
edited Nov 22 at 16:57
Toby Speight
16.2k133965
edited Nov 22 at 16:57
Toby Speight
16.2k133965
16.2k133965
asked Nov 22 at 16:27
jocker fantom
82
asked Nov 22 at 16:27
jocker fantom
82
asked Nov 22 at 16:27
jocker fantom
82
82
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 at 16:34
my problem is convert QByteArray to Array.
– jocker fantom
Nov 22 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 at 16:43
i hav to read all data from modem: QByteArray read= port->readAll(); and write it
– jocker fantom
Nov 22 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 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 at 16:34
my problem is convert QByteArray to Array.
– jocker fantom
Nov 22 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 at 16:43
i hav to read all data from modem: QByteArray read= port->readAll(); and write it
– jocker fantom
Nov 22 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 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 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 at 16:34
my problem is convert QByteArray to Array.
– jocker fantom
Nov 22 at 16:39
my problem is convert QByteArray to Array.
– jocker fantom
Nov 22 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 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 at 16:43
i hav to read all data from modem: QByteArray read= port->readAll(); and write it
– jocker fantom
Nov 22 at 16:51
i hav to read all data from modem: QByteArray read= port->readAll(); and write it
– jocker fantom
Nov 22 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 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 at 16:56
|
show 1 more comment
1 Answer
1
active
oldest
votes
up vote
0
down vote
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 at 12:06
Alexander Chernin
24117
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
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 at 12:06
Alexander Chernin
24117
add a comment |
up vote
0
down vote
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 at 12:06
Alexander Chernin
24117
add a comment |
up vote
0
down vote
up vote
0
down vote
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 at 12:06
Alexander Chernin
24117
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 at 12:06
Alexander Chernin
24117
answered Nov 23 at 12:06
Alexander Chernin
24117
answered Nov 23 at 12:06
Alexander Chernin
24117
answered Nov 23 at 12:06
Alexander Chernin
24117
24117
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 at 16:34
my problem is convert QByteArray to Array.
– jocker fantom
Nov 22 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 at 16:43
i hav to read all data from modem: QByteArray read= port->readAll(); and write it
– jocker fantom
Nov 22 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 at 16:56