How to write bytes read from serial port to a QFile

[shamik]

So you will have to read the input data in binary form and transmit it the same similar to what you have done above.
Nothing speciall actually.

i dint get u
do you mean i dont need to change my code ??

[high_flyer]

Yes you will need to change a bit.
I was not sure if you want to read the data from the serial port or from a file and send through serial port.
If you are getting the data through the serial port, then you can use QDataStream and QFile to save that binary data in its origianl binary form (not text).

EDIT:
by using QextSerialPort this is really easy, just few lines of code since both QextSerial and QFile are QIODevices, that you can use with QDataStream.

[shamik]

so u mean 2 say just by using QDataStream in place of QTextStream in the above code will do !!! rite

i have already got QExtSerial package with me. But i am afraid of using it since i m finding it difficult. if this code will work fine with other file formats also by using QDataStream then i think i wont b using QExtSerial for that. In my current code i m just reading the data from the serial port. but the application involves sending file through serial port also.

if anybody has some code in which there is use of QExtSerial then please post it over here. it will b of gr8 help.

best regards,

[high_flyer]

for goodness sake,please don't use sms lingo.
You have a kyeboard, use it.

Well, basically yes, it would be enough if you change to QDataStream, and write access to the file should be binary raw.

But your whole approach is not very nice.
You are reading one char at a time, and write one char at a time.
Why not read everything at once (or large chunks) and write is so as well.

I think QextSerialPort is much easier then what you used here, and it plays nicely with Qt.

But do what you think is the best for you.

[shamik]

in my above code i have changed from QTextStream to QDataStream.

but i not able to write the file properly.
if the file is simple text file then it is written correctly but if it something else like .doc, .pdf etc. then i m not able to write to the file. the data written to the file is also not readable on the terminal as u might c from the code that i m also printing the data on the terminal and writing the same to the file simultaneously.

please tell me wat 2 do in that case. is it that this problem cant be solved without using QExtSerial ??

[high_flyer]

how do you expect us to answer that with out seeing the code you are talking about?

PLEASE don't use sms short typing!

[shamik]

the code is already posted above

the only difference is instead of QTextStream i have used QDataStream

[high_flyer]

you might want to try writeRawBytes()
And you also should open the file in raw mode (IO_Raw)(as I told you before) .

[shamik]

i have done following modifications in the above code :

ff.open( IO_Raw | IO_WriteOnly | IO_Append);
stream.writeRawBytes((const char *)recbuf, 1);

ff.open( IO_Raw | IO_WriteOnly | IO_Append);
stream.writeRawBytes((const char *)recbuf, 1);

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but still the problem is that the file size is the same i.e. exact number of bytes are getting written but i m not able to read that file.
i.e. if i transfer a pdf file then the pdf reader is not able to read the file
if i transfer a .doc file then openoffice is not able to read the file
if i transfer a .jpg file then picture viewer is not able to read the file

can u please tell now what to do ??

[high_flyer]

hmm...
Try openning both files (the original and the one you wrote through the serial port) with an hex editor/viewer, this might show you what in fact is being written from your code.

[shamik]

hmm...
Try openning both files (the original and the one you wrote through the serial port) with an hex editor/viewer, this might show you what in fact is being written from your code.

what is hex editor/viewer and how can i open it?
can you please tell how to open both the files original and the one i wrote through serial port.
it would be quite helpful if you can explain in detail or can provide some code

[high_flyer]

Hex editor
Ask if you have further questions.