QIODevice and QTextCodec?

[whitefurrows]

Hi,

i read files like this,

string entire;
	char buf[1024];
	while (device->readLine(buf, sizeof(buf)) && !device->atEnd()) { //QIODevice = device
		entire += buf;
		//...
	}
	size_t length = entire.length();
 
	for (size_t i = 0; i < length; ++i) {
		char c = entire[i];
		//...
		s.append(c);
	}

string entire;
	char buf[1024];
	while (device->readLine(buf, sizeof(buf)) && !device->atEnd()) { //QIODevice = device
		entire += buf;
		//...
	}
	size_t length = entire.length();

	for (size_t i = 0; i < length; ++i) {
		char c = entire[i];
		//...
		s.append(c);
	}

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but my QSting ("s") looks dirty. The problem is the file can be coded in utf8, iso 8859-15 and a lot more.

How can i read the file with the right codec, if the user choose the codec before?

I have try QTextCodec::setCodecForCStrings( QTextCodec::codecForName( codec ) ) but i hink thats not right. Can you help me pleas?

[whitefurrows]

Hi,

to describe the problem exact, with QTextCodec::setCodecForCStrings(QTextCodec::codecF orName("UTF-8")) is the result:
Special character: ??,??,??,??,??,??,??,???

and without QTextCodec::setCodecForCStrings():
Special character: �,ä,�,ö,�,ü,� ,�

The origin text is:
Special character: Ä,ä,Ö,ö,Ü,ü,ß,€

Can you help me now please?

[high_flyer]

You need to know from which encoding to which you need to convert, and it seems you know how to convert between encodings, so what is the problem you have?

[whitefurrows]

The encoding for the files is known, but i don't know how can i use the coding to read the file. I need to encode at this place char c = entire[i]; Ther is no problem to use QChar if that mouch more easy to handle! You understand my problem?

[high_flyer]

You understand my problem?

Not really.
Why don't you just do exactly as shown in QTextCodec documentation?
If you know the file encoding, then I still fail to understand your problem, unless your encoding is not supported by QTextCodec.
From the docs:

QByteArray encodedString = "..."; //from the file
 QTextCodec *codec = QTextCodec::codecForName("KOI8-R");
 QString string = codec->toUnicode(encodedString);

QByteArray encodedString = "..."; //from the file
 QTextCodec *codec = QTextCodec::codecForName("KOI8-R");
 QString string = codec->toUnicode(encodedString);

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[mattc]

You may want to replace the QIODevice with a QTextStream and then use QTextStream::setCodec