QFile, QTextStream, seek()

[TheKedge]

Hello all,
sorry if I'm making a silly mistake here, but I'm not sure what the best way is.
I'm making a file that has several blocks (at predefined positions). When I create the file, the blocks are not full (i.e. not contiguous). They will be filled later. So, I'd like to skip/extend the file to the position of the next block. Using a seek() and a write just appends and doesn't work.

how do I extend file?
thanks
K
below is the code:

//make a new file with name in the directory 
	file = new QFile(path +"\\"+ name);
	if(file->open(QIODevice::Append))
		fileName = name;// the file has been opened
	else
		return -1;
 
//	make a text stream
	QTextStream stream( file );
 
//	write the header
	stream.seek(POS_HEADER);
	stream << makeHeader();
 
//	write the comments block 
	QString comments("This is the standard comments block");
	stream.seek( POS_HEADER_COMMENT);
	stream << comments;

//make a new file with name in the directory 
	file = new QFile(path +"\\"+ name);
	if(file->open(QIODevice::Append))
		fileName = name;// the file has been opened
	else
		return -1;

//	make a text stream
	QTextStream stream( file );

//	write the header
	stream.seek(POS_HEADER);
	stream << makeHeader();

//	write the comments block 
	QString comments("This is the standard comments block");
	stream.seek( POS_HEADER_COMMENT);
	stream << comments;

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[jacek]

open(QIODevice::Append)

Maybe you should use QIODevice::ReadWrite to make seek() work?

[TheKedge]

I know why you've had more thanks than posts.
thanks
K

[wysota]

I know why you've had more thanks than posts.

Are you sure he has more thanks than posts?

It is true that his thank ratio per thanked post is greater than 1.00 though

[TheKedge]

Ahh, I see,

so he has 359 thanks in 2504 posts ... that's only ...erm, 14% useful posts

K