将两个BMP文件与Get-Filehash进行比较

Question

我有一个脚本，该脚本通过其文件哈希进行比较两个图像：

if((Get-FileHash C:UsersUserNameDesktopOrImg).hash -ne (Get-FileHash C:UsersUserNameDesktopRefImg).hash)
{"Files are different"}
else {"Files are the same"}

但是我如何确定哈希属性有两个图像是不同的？出于测试目的，我创建了两个不同的图像（大小，内容），但是当我比较它们时 - 哈希是相同的。也许我做错了什么？

Answer 1

这将返回使用不同文件哈希的所有文件。注意：这将不会检查文件是否存在于目录两个中，也不会检查目录两个目录是否包含目录一号不包含的文件。

$leftDir = "D:tmp1"
$rightDir = "D:tmp2"
$differentFiles = Get-ChildItem $leftDir | Where-Object {
    ($_ | Get-FileHash).Hash -ne (Get-FileHash (Join-Path $rightDir $_.Name)).Hash
} 
if (-not $differentFiles)
{
    'All files are the same'
}
else
{
    $differentFiles | Foreach-Object {Write-Output "File $($_.Name) is different"}
}

Answer 2

我用MD5总和为我的测试脚本完成了此Windows PowerShell。这对我来说很好。

    $FilePathSource = "C:SusanthaTest.txt"
    $FilePathDestination = "C:SusanthaTest.txt"
    try
    {
    $md5 = New-Object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider
    $hashedFileSource = [System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes($FilePathSource)))
    $hashedFileDestination = [System.BitConverter]::ToString($md5.ComputeHash([System.IO.File]::ReadAllBytes($FilePathDestination)))
    [bool]$Result = $hashedFileSource.CompareTo($hashedFileDestination)
      if ($Result) {
       Write-Host "Not the Same Files :("
       }
      else{
       Write-Host "Same Files :)"
       }
   }
   catch
   {
   Write-Host  $_.Exception.Message
   Write-Host $_.Exception.ItemName
   Break
   }

Answer 3

尝试此

$x = (Get-FileHash 'C:temp1.bmp').hash
$z = (Get-FileHash 'C:temp2.bmp').hash
[bool]$w = $z.CompareTo($x)
if ($w) {
Write-Host "Not the same"
}

Answer 4

我问了关于我写的脚本的同样的问题，该脚本完成了一半的工作。这是完成的文章。

参考此处比较目录和子目录，并基于MD5 Hash

替换文件

感谢@lotpings的帮助

$Source=  "D:Folder1"
$Destination = "D:folder2"
get-childitem $Source -Recurse | foreach {
#Calculate hash using Algorithm MD5 reference http://www.tomsitpro.com/articles/powershell-file-hash-check,2-880.html
$SrcFile = $_.FullName
$SrcHash = Get-FileHash -Path $SrcFile -Algorithm MD5
$DestFile = $_.Fullname -replace [RegEx]::escape($Source),$Destination
Write-Host "Copying $SrcFile to $DestFile" -ForegroundColor Yellow
if (Test-Path $DestFile) {
    #Check the hash sum of the file copied
    $DestHash = Get-FileHash -Path $DestFile -Algorithm MD5
    #compare them up
    if ($SrcHash.hash -ne $DestHash.hash) {
        Write-Warning "$SrcFile and $DestFile Files don't match!" 
        Copy-Item $SrcFile -Destination $DestFile -Force
    } else {
        Write-Host "$SrcFile and $DestFile Files Match" -ForegroundColor Green
    }
} else {
    Copy-Item $SrcFile -Destination $DestFile -Force
}
} 

Answer 5

我进行了略微更改。不知道为什么您有2 x其他语句。副本下降了两次。下面的更改将显示为红色的应对。

$Source =  "folder1"
$Destination = "folder2"
get-childitem $Source -Recurse | foreach {
#Calculate hash using Algorithm MD5 reference http://www.tomsitpro.com/articles/powershell-file-hash-check,2-880.html
$SrcFile = $_.FullName
$SrcHash = Get-FileHash -Path $SrcFile -Algorithm MD5
$DestFile = $_.Fullname -replace [RegEx]::escape($Source),$Destination
Write-Host
Write-Host "Comparing $SrcFile to $DestFile" -ForegroundColor Yellow
if (Test-Path $DestFile) {
    #Check the hash sum of the file copied
    $DestHash = Get-FileHash -Path $DestFile -Algorithm MD5
    #compare them up
    if ($SrcHash.hash -ne $DestHash.hash) {
        Write-Warning "$SrcFile and $DestFile Files don't match!" 
            Write-Host "Copying $SrcFile to $DestFile" -ForegroundColor Red
        Copy-Item $SrcFile -Destination $DestFile -Force
    } else {
        Write-Host "$SrcFile and $DestFile Files Match" -ForegroundColor Green
    }
} 
}