我正在从网络服务器进行每日图像的 BITS 传输,并且在传输过程中我不断得到随机丢弃。
当它循环下载时,我偶尔会收到“连接过早关闭”或“安全通道支持中发生错误”。每个文件夹中大约有 180 张图像,其中可能有 5-10% 发生这种情况。对于那些未完成的,我需要重试下载。
我这样做的代码如下 - 我不完美的解决方法是运行循环两次,但我希望找到更好的解决方案。
# Set the URL where the images are located
$url = 'https://www.nrlmry.navy.mil/archdat/global/stitched/MoS_2/navgem/wind_waves/latest/'
# Set the local path where the images will be stored
$path = 'C:\images\Wind_Waves\latest\'
# Create a list of all assets returned from $url
$site = Invoke-WebRequest -UseBasicParsing -Uri $url
# Create a table subset from the $site of all files returned with a .jpg extension
$table = $site.Links | Where-Object{ $_.tagName -eq 'A' -and $_.href.ToLower().EndsWith("jpg") }
# Create a list of all href items from the table & call it $images
$images = $table.href
# Enumerate all of the images - for troubleshooting purposes - can be removed
$images
# Check to make sure there are images available for download - arbitrarily picked more than 2 $images
if($images.count -gt 2){
# Delete all of the files in the "latest" folder
Remove-Item ($path + "*.*") -Force
# For loop to check to see if we already have the image and, if not, download it
ForEach ($image in $images)
{
if(![System.IO.File]::Exists($path + $image)){
Write-Output "Downloading: " $image
Start-BitsTransfer -Source ($url + $image) -Destination $path -TransferType Download -RetryInterval 60
Start-Sleep 2
}
}
Get-BitsTransfer | Where-Object {$_.JobState -eq "Transferred"} | Complete-BitsTransfer
} else {
Write-Output "No images to download"}