Append a string to the beginning of a file
How do I append a string to the beginning of a %FileCharacterStream in an existing file?
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How do I append a string to the beginning of a %FileCharacterStream in an existing file?
E.g.:
s fileName="C:\temp\test.txt" s f=##class(%FileCharacterStream).%New() s f.Filename=fileName s f1=##class(%FileCharacterStream).%New() s f1.Filename=fileName d f.Write("start ") d f.CopyFrom(f1) d f.Write(" end") d f.SaveStream() s f="",f1=""Result:
Thank!
That's what I though, but it seemed slow.
Isn't there anyway to move the stream cursor back without erasing the existing data?
And if not, couldn't that be done using a device directly?
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Not possible, due to data in the file stored sequentially. If you want to insert some data in any place, it means you should move all next data on the disk too. So, the only way it is a new file.