How do i append binary afp files in powershell?

Question

i am trying to append binary AFP files into one file. When I used my code below the same file gets written three times instead of the three files I have getting appended to one file. Why would the value of $bytes not change? Get-Content was unsuccessful without causing errors in the AFP file.

$dira = "D:\User1\Desktop\AFPTest\"

$list = get-childitem $dira -filter *.afp -recurse | % { $_.FullName } | Sort-Object

foreach($afpFile in $list){

    $bytes = [System.IO.File]::ReadAllBytes($afpFile) 

    [io.file]::WriteAllBytes("D:\User1\Desktop\AFPTest\Content.afp",$bytes)

}

The script below is after I made a change to store the $bytes to a $data variable and then write out $data.

$dira = "D:\User1\Desktop\AFPTest\"

$list = get-childitem $dira -filter *.afp -recurse | % { $_.FullName } | Sort-Object -descending



foreach($afpFile in $list){

    Write-Host $afpFile

    $bytes = [System.IO.File]::ReadAllBytes($afpFile)

    $data += $bytes 

}
    [io.file]::WriteAllBytes("D:\User1\Desktop\AFPTest\Content.afp",$bytes)

I attempted to combine them manually by setting each of the three files to a variable and then adding them to the $data array but the same issue happens of the repeated image. The code is below.

$dira = "D:\User1\Desktop\AFPTest\"

$list = get-childitem $dira -filter *.afp -recurse | % { $_.FullName } | Sort-Object

$file3 = [System.IO.File]::ReadAllBytes("D:\User1\Desktop\AFPTest\000001.afp")

$file2 = [System.IO.File]::ReadAllBytes("D:\User1\Desktop\AFPTest\000002.afp")

$file1 = [System.IO.File]::ReadAllBytes("D:\User1\Desktop\AFPTest\000003.afp")

$data = $file1 + $file2


[io.file]::WriteAllBytes("D:\User1\Desktop\AFPTest\AFP.afp",$data)

You can use the FileStream class with FileMode Append. See also here... — Peter Schneider
– Peter Schneider, Commented Aug 19, 2015 at 18:50

Keith Hill · Accepted Answer · 2015-08-19 18:50:04Z

2

WriteAllBytes() always creates a new file. You want to append. Try this:

...
$bytes = @()
foreach($afpFile in $list) {
    $bytes += [System.IO.File]::ReadAllBytes($afpFile) 
}
[io.file]::WriteAllBytes("D:\User1\Desktop\AFPTest\Content.afp",$bytes)

answered Aug 19, 2015 at 18:50

Keith Hill

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11 Comments

cchristie45 Over a year ago

i tried that by using $data += $bytes and writing $data but the same file was displayed 3 times instead of the three different files.

Keith Hill Over a year ago

Just to be clear, you're saying that the byte content for one of the files is repeated three times in $bytes? If so, do a Write-Host $afpFile just to make sure you're not processing the same file over and over.

cchristie45 Over a year ago

I did that already and it displayed different files letting me know that it was looping correctly.

Keith Hill Over a year ago

Can you update your question with the script you are trying now - moving the WriteAllBytes() out of the loop and accumulating the byte data into $data?

Keith Hill Over a year ago

You should be referencing $data in the call to WriteAllBytes. Also, I would set to $data = @() before the foreach loop just to make sure it is initialized to empty.

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