[问题求助] PowerShell怎么调用api[已解决]

czjt1234

DosDateTimeToFileTime
https://learn.microsoft.com/zh-cn/windows/win32/api/winbase/nf-winbase-dosdatetimetofiletime

FileTimeToSystemTime
https://learn.microsoft.com/zh-cn/windows/win32/api/timezoneapi/nf-timezoneapi-filetimetosystemtime

我想调用这两个api处理dos格式的时间，请问应该怎么写

terse

回复 11# czjt1234
应该是没有奇数秒的，可能天生缺陷吧

Five66

额 , 纠结奇数秒数做啥
ieee 浮点数 不也照样不能准确表示?
把它当成误差就是了

czjt1234

回复 14# went


    非常感谢

went

回复 13# czjt1234


    上面报错需要把函数声明short改为ushort
api转换的时间也是把秒缩放的,2个相近的秒时间会生成同个ms-dos时间

czjt1234

回复 10# went

这个代码可以运行，不过我的纠结是秒的准确数，因为这样没有单数的秒了

还有小细节，这个时间是UTC时间，转换为系统时间要+8小时

czjt1234

回复 9# went

用6楼的换算
当前时间 2024/04/12 19:39:57
MS-DOS wFatDate:588C wFatTime:9CFD

但是用9楼的计算0x588C9CFD报错
无法将“DosDateTimeToFileTime”的参数“wFatTime”(其值为“40189”)转换为类型“System.Int16”:“无法将值“40189”转换为
类型“System.Int16”。错误:“值对于 Int16 太大或太小。””
所在位置 行:44 字符: 1
+ [WinApi]:osDateTimeToFileTime($wFatDate,$wFatTime,[ref]$st_file_tim ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: ( [], MethodException
    + FullyQualifiedErrorId : MethodArgumentConversionInvalidCastArgument

czjt1234

回复 7# terse


可以转的，年月日时分都没问题
但是秒要除以2
我就纳闷4秒和5秒怎么区分，还是就不能区分
所以想用API对比一下计算结果

went

直接转换

cls

$ms_dos_time = 0x5C8A688A

$wFatDate = $ms_dos_time -shr 16
$wFatTime = $ms_dos_time -band 0xffff

$day = $wFatDate -band 0x1f
$month = ($wFatDate -shr 5) -band 0x0f
$year = (($wFatDate -shr 9) -band 0x7f)+1980
$second = ($wFatTime -band 0x1f)*2
$minute = ($wFatTime -shr 5) -band 0x3f
$hour = ($wFatTime -shr 11) -band 0x1f


'MS-DOS wFatDate:{0:X4} wFatTime:{1:X4}' -f $wFatDate,$wFatTime
'系统时间 {0:d4}/{1:d2}/{2:d2} {3:d2}:{4:d2}:{5:d2}' -f $year,$month,$day,$hour,$minute,$second
复制代码

went

如果32位数0x5C8A688A高16位是wFatDate,低16位是wFatTime,使用以下代码转换

$st_file_time = New-Object 'WinApi+FILETIME'
$st_system_time = New-Object 'WinApi+SYSTEMTIME'

$ms_dos_time = 0x5C8A688A

$wFatDate = $ms_dos_time -shr 16
$wFatTime = $ms_dos_time -band 0xffff
[WinApi]::DosDateTimeToFileTime($wFatDate,$wFatTime,[ref]$st_file_time)
[WinApi]::FileTimeToSystemTime([ref]$st_file_time,[ref]$st_system_time)

'MS-DOS wFatDate:{0:X4} wFatTime:{1:X4}' -f $wFatDate,$wFatTime
'系统时间 {0:d4}/{1:d2}/{2:d2} {3:d2}:{4:d2}:{5:d2}' -f $st_system_time.wYear,$st_system_time.wMonth,$st_system_time.wDay,$st_system_time.wHour,$st_system_time.wMinute,$st_system_time.wSecond
复制代码

Five66

.net支持的语言(如C#)的平台调用
或者
基于反射的动态平台调用

不管那种都挺麻烦的(尤其是后者)

不如convert成字符串 , 然后截取手动解析

terse

这个自己不能转吗

went

给出一个反向转换的示例
使用API,当前时间转MS-DOS时间

cls

$code=@'
    using System;
    using System.Runtime.InteropServices;
    public static class WinApi{
        public struct FILETIME {
            public uint dwLowDateTime;
            public uint dwHighDateTime;
        };
        public struct SYSTEMTIME {
            public short wYear;
            public short wMonth;
            public short wDayOfWeek;
            public short wDay;
            public short wHour;
            public short wMinute;
            public short wSecond;
            public short wMilliseconds;
        };
        [DllImport("kernel32.dll")]
        public static extern bool DosDateTimeToFileTime(short wFatDate, short wFatTime, ref FILETIME lpFileTime);
        [DllImport("kernel32.dll")]
        public static extern bool FileTimeToDosDateTime(ref FILETIME lpFileTime, ref short wFatDate, ref short wFatTime);
        [DllImport("kernel32.dll")]
        public static extern bool FileTimeToSystemTime(ref FILETIME lpFileTime,ref SYSTEMTIME lpSystemTime);
        [DllImport("kernel32.dll")]
        public static extern bool SystemTimeToFileTime(ref SYSTEMTIME lpSystemTime, ref FILETIME lpFileTime);
        [DllImport("kernel32.dll")]
        public static extern void GetLocalTime(ref SYSTEMTIME lpSystemTime);
    }
'@
Add-Type -TypeDefinition $code 

$st_file_time = New-Object 'WinApi+FILETIME'
$st_system_time = New-Object 'WinApi+SYSTEMTIME'
$wFatDate = New-Object 'uint16'
$wFatTime = New-Object 'uint16'
[WinApi]::GetLocalTime([ref]$st_system_time)
[WinApi]::SystemTimeToFileTime([ref]$st_system_time,[ref]$st_file_time)
[WinApi]::FileTimeToDosDateTime([ref]$st_file_time,[ref]$wFatDate,[ref]$wFatTime)

'当前时间 {0:d4}/{1:d2}/{2:d2} {3:d2}:{4:d2}:{5:d2}' -f $st_system_time.wYear,$st_system_time.wMonth,$st_system_time.wDay,$st_system_time.wHour,$st_system_time.wMinute,$st_system_time.wSecond
'MS-DOS wFatDate:{0:X4} wFatTime:{1:X4}' -f $wFatDate,$wFatTime
复制代码

went

回复 3# czjt1234


    64位数,怎么得出MSDN里描述的wFatDate和wFatTime? API里面需要这两个参数

czjt1234

https://learn.microsoft.com/zh-c ... sdatetimetofiletime
根据这里按二进制逐位分析，可以得到年月日时分秒，但一来麻烦，二来秒的处理结果有问题