codegay

用nim写了一个，表示很开心：

type 
    WINBOOL* = uint32

    s64* = uint64

proc  getDiskFreeSpaceEx*(name: cstring, freeBytes,
    lpTotalNumberOfBytes,lpTotalNumberOfFreeBytes: var s64): WINBOOL
    {.stdcall, dynlib: "kernel32", importc: "GetDiskFreeSpaceExA", discardable.}

proc getusedspace*(name: cstring):auto {.discardable.} =
    var freeBytes, totalBytes, totalFreeBytes: s64
    getDiskFreeSpaceEx(name, freeBytes, totalBytes,totalFreeBytes)
    result = ((totalBytes - freeBytes) div 1024 div 1024)

echo "已经使用：", getusedspace("c:\\EFI"), "MB"
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