Qt-interest Archive, July 2007
QByteArray from unsigned char*
Message 1 in thread
Hello,
I have an array of unsigned char and now I want to store this data into
QByteArray to be able to store the data into a file (including all '\0's).
Now I haven't found any solution to to so (storing unsigned char* into a
file with Qt).
Can anyone tell me how to solve my problem?
Regards,
Patrick
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Message 2 in thread
What's wrong with QByteArray::fromRawData(const char * data, int size)
????
You receive a QByteArray from this static method which you can
conviniently write to files (i.e. using QDataStream or QFile directly ...)
Regards,
Malte
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Message 3 in thread
The problem is that I get an "unsigned char*" and QByteArray::fromRawData
needs a "const char*", so I need to cast "unsigned char*" to "const char*"
and QByteArray::fromRawData stops at the first '\0' of the data.
Regards,
Patrick
"Malte Witt" <malte.witt@xxxxxxxxxxxxx> schrieb im Newsbeitrag
news:OF6279E251.B288E3A2-ONC125730C.00367463-C125730C.00369E05@xxxxxxxxxxxxxxxx
> What's wrong with QByteArray::fromRawData(const char * data, int size)
> ????
> You receive a QByteArray from this static method which you can
> conviniently write to files (i.e. using QDataStream or QFile directly ...)
>
> Regards,
> Malte
>
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Message 4 in thread
> The problem is that I get an "unsigned char*" and
QByteArray::fromRawData
> needs a "const char*", so I need to cast "unsigned char*" to "const
char*"
Yes, but how could this be a problem if you want to write the contents to
a file? If you access the QByteArray by the data() method, it will get
deepcopied and you can access the copy in a NON-const way ...
Conversion from unsigend to signed doesn't matter at all if you just want
to write the data to a file ...
> and QByteArray::fromRawData stops at the first '\0' of the data.
No - AFAIK it does not ...
Regards,
Malte
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Message 5 in thread
What Qt version are you using?
the doc for Qt 4.3 explicitely states that it should work on data that
has \0 embedded (see the example).
http://doc.trolltech.com/4.3/qbytearray.html#fromRawData
Cheers,
Peter
> -----Original Message-----
> The problem is that I get an "unsigned char*" and
QByteArray::fromRawData
> needs a "const char*", so I need to cast "unsigned char*" to "const
char*"
> and QByteArray::fromRawData stops at the first '\0' of the data.
>
> Regards,
> Patrick
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Message 6 in thread
"Patrick Feistel" <Feistel@xxxxxxxxxx> wrote in message
news:f6aifh$nq$1@xxxxxxxxxxxxxxxxxxxxx
> The problem is that I get an "unsigned char*" and
> QByteArray::fromRawData needs a "const char*", so I need to cast
> "unsigned char*" to "const char*" and QByteArray::fromRawData stops at
> the first '\0' of the data.
That's where the second parameter "size" comes in.
Volker
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