QTextStream capture stdout from xsltParseStylesheetFile

[jacek]

stderr .... i want to show only on user the parse file error line ... throw i think is not possibel ....

It is possible, you have even found the right method --- use xsltSetGenericErrorFunc() function and write your own handler that will store all error messages in a QString or it will send them directly to the right widget. QString::sprintf() might come in handy.