如何写入覆盖以前内容的文件

Question

文件中有写入数据的方法：

to output:someThing toFile:someFile
    try
        tell application "System Events" to set myname to get name of (path to me)
        set AppleScript's text item delimiters to myname
        set pathToFolder to text item 1 of ((path to me) as text)
        set outputFileWithPath to (((pathToFolder) as text) & someFile)
        set fileRef to (open for access outputFileWithPath with write permission)
        write (someThing) to fileRef starting at 0
        close access fileRef
    on error errmess
        log errmess
        try -- make sure file is closed on any error
            close access fileRef
        end try
    end try
end output:toFile:
set outputFile to "test1"
(my output:"first second third" toFile:outputFile)

(my output:"forth" toFile:outputFile)

这个例子中的问题是：最后，我将有一个文件：

forth second third

目标是只有最后一条记录。在这个例子中：

forth

Answer 1

write (someThing) to fileRef starting at [...] 结构是为了将新数据插入文件：它会覆盖文件中该点的数据而不更改任何其他内容。如果你想在某一点之后删除文件的内容，使用set eof fileRef to [some integer]。 'eof'这里代表'end of file'。您的代码将是：

    set fileRef to (open for access outputFileWithPath with write permission)
    set eof fileRef to 0
    write (someThing) to fileRef
    close access fileRef

如何写入覆盖以前内容的文件

How to write to file with overriding previous content

macos

applescript