error : readLine is not a function

[Fabrice Esti�venart]

hello,
i'd like to read a local file line by line, i try :
		try
		{
			var file = 
Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
			file.initWithPath("c:\\myFile.txt");

			var inputStream = 
Components.classes["@mozilla.org/network/file-input-stream;1"].createInstance(Components.interfaces.nsIFileInputStream);
			
			var line;
		
			while(inputStream.readLine(line))
			{
				alert(line);	
			}
			
			inputStream.close();
		}
		catch(e)
		{
			alert(e);
		}

...but get the error type : inputStream.readLine is not a function
what to do ?
thx,
Fabrice
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