Truncate a file: Difference between revisions

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 =={{header|Lingo}}==
-With native means (Fileio Xtra) file truncation can only be implemented indirectly, either using a temp file or loading truncated file contents into memory, deleting original and writing memory back to file.
+With native means (Fileio Xtra) file truncation can only be implemented indirectly, either using a temp file or loading truncated file contents into memory, deleting original and writing memory back to file:
+<lang lingo>----------------------------------------
+-- Truncates file
-But there are free plugins ("Xtras") like e.g. "BinFile Xtra" that support "in-file" truncation:
+-- @param {string} filename
+-- @param {integer} length
+-- @return {bool}
+----------------------------------------
+on truncate (filename, length)
+  fp = xtra("fileIO").new()
+  fp.openFile(filename, 0)
+  data = fp.readByteArray(length)
+  fp.delete()
+  fp.createFile(filename)
+  fp.openFile(filename, 2)
+  fp.writeByteArray(data)
+  err = fp.status()
+  fp.closeFile()
+  fp=0
+  return (err=0)
+end</lang>
+But there are also free plugins ("Xtras") like e.g. "BinFile Xtra" that support "in-file" truncation:
 {{libheader|BinFile Xtra}}
 <lang lingo>-- truncates file to 10 KB length