MaxScript用二进制读取方式获取Max文件版本

Fn GetMaxFileVersion theMaxFile = 
(
    local versionFloat,theBinStream,keyWord,notFind,textFromBin,binEnd
    versionFloat = 0
    if isMaxFile  theMaxFile do
    (
        theBinStream = fopen  theMaxFile "r"
        keyWord = "Version:"
        notFind = true
        textFromBin = ""
        fseek theBinStream 0 #seek_end
        binEnd = ftell theBinStream 
        fseek theBinStream 0 #seek_set
        
        while  (ftell theBinStream < binEnd ) and notFind do
        (
            textFromBin = ReadString theBinStream
            if textFromBin == "V" do
            (
                for i = 1 to keyWord.Count - 1 do textFromBin += ReadString theBinStream as string
            )
            if keyWord == textFromBin  do
            (
                versionString = ""
                for i = 1 to 5 do versionString += ReadString theBinStream as string
                versionFloat = versionString as float
                notFind = false
            )
        )
        FClose  theBinStream
    )
    versionFloat
)

GetMaxFileVersion(getOpenFileName())