powershell 自动递增 001

Question

这就是我想要实现的。截屏保存为$username-$date-000.jpg 其中 000 需要在每次保存文件时自动递增。（即 000,001,002）

我试过自动生成号码。我该怎么办？如何自动增加数字？

$Path = read-host "Screenshot will save to - [1] Desktop or [2] C:\" 
switch ($Path)
{
        1
        {
        $Path = "$($env:USERPROFILE)\Desktop\"
        }
        2
        {
        $Path = "C:\"
        }
}
$X = 0
$FileName = %{"$env:USERNAME-$(get-date -f MM-dd)-$(($X+1).ToString("000")).jpg"}
$File = "$Path$FileName"

Answer 1

这可能不是理想的实现方式，但它仍然有效：

for ($i = 0; $i -ne 200; $i = $i + 20) {
    $num = "0" * ( 3 - $i.ToString().Length) + $i.ToString()
    $FileName = "file-$num"
    $FileName
}

这里我只是获取数字的长度作为字符串，并根据 3 - {数字的字符长度} 添加 x 个 0 到开头。

因此您需要添加基于 x:

的 0 数量计算

$num = "0" * ( 3 - $x.ToString().Length) + $x.ToString()

您的文件名将是：

$FileName = %{"$env:USERNAME-$(get-date -f MM-dd)-$num.jpg"}

Answer 2

当让用户在路径之间进行选择时，我认为您需要更多 (3) 个变量来跟踪该路径的当前序列号。

此外，我建议使用 Join-Path cmdlet 将字符串合并到路径中。

像这样的东西应该可以工作：

# we need three index variables: 
# one for the final file name, a second one for when the user chooses to save to desktop
# and a third one for when the user selects to save to the C:\ drive.
$index = $desktopIndex = $cdriveIndex = 0

# enter a loop to make sure no other choices than '1' or '2' get through
do {
    $choice = Read-Host "Screenshot will save to - [1] Desktop or [2] C:\"     #"# let the user choose the destination
    switch ($choice) {
        '1' { 
              $Path = Join-Path -Path $env:USERPROFILE -ChildPath 'Desktop'
              $index = $desktopIndex++  # increment the counter for files that go to the desktop
            }
        '2' { 
              $Path = "C:\"
              $index = $cdriveIndex++   # increment the counter for files that go to the C:\ drive
            }
    }
} until ($choice -eq '1' -or $choice -eq '2')

# construct the filename using the -f format operator
$fileName = '{0}-{1:MM-dd}-{2:000}' -f $env:USERNAME, (Get-Date), $index
$file     = Join-Path -Path $Path -ChildPath $FileName

希望对您有所帮助

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