24 lines
1.0 KiB
PowerShell
24 lines
1.0 KiB
PowerShell
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# Byte-safe device screenshot helper.
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# ASCII-only. PS 5.1 `>` redirection writes UTF-16, which corrupts PNG bytes
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# (measured 2026-10-30: `adb exec-out screencap -p > x.png` produced a file
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# starting with FF FE). Capture on-device and pull instead.
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param(
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[Parameter(Mandatory = $true)][string]$Out,
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[string]$Device = "/sdcard/shot.png"
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)
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$ErrorActionPreference = "Stop"
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$adb = "D:\working\android\sdk\platform-tools\adb.exe"
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$old = $ErrorActionPreference
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$ErrorActionPreference = "Continue"
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try {
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& $adb shell screencap -p $Device | Out-Null
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if ($LASTEXITCODE -ne 0) { throw "screencap failed ($LASTEXITCODE)" }
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& $adb pull $Device $Out | Out-Null
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if ($LASTEXITCODE -ne 0) { throw "pull failed ($LASTEXITCODE)" }
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}
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finally { $ErrorActionPreference = $old }
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$b = [System.IO.File]::ReadAllBytes($Out)
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$sig = ($b[0..3] | ForEach-Object { $_.ToString("X2") }) -join " "
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if ($sig -ne "89 50 4E 47") { throw "not a PNG (sig=$sig): $Out" }
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Write-Host ("OK {0} ({1:N0} bytes)" -f (Split-Path $Out -Leaf), $b.Length)
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