3,038 questions
Background Downloader with FTP not working.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(188.79999999999998, 2%, 28%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERS%3C/text%3E%3C/svg%3E)
raju somala
21
Reputation points
HI Team ,
I have set up an FTP server by using IIS(Windows 10 and IIS Version 10.0.19041.1).
Client uwp application uses BackGroundDownloader API to download files from FTP server. The FTP server directory consist of different files.
Filenames are in English , some are in Japanese.(こんにちは.JPG, カメラ.PDF , File1.PDF ectc..)
Files that have English names are downloading properly. and Japanese FIle names are not downloading.
Download operation class has URI as a parameter. The below is string URL I am using for Japanese
ftp://admin:admin@X .yyy.z.z/Folder1/Folder2/%E3%81%8A%E5%BD%B9%E7%AB%8B%E3%81%A1%E6%83%85%E5%A0%B1%E6%8A%95%E7%A8%BF%E3%82%A2%E3%83%BC%E3%82%AB%E3%82%A4%E3%83%960707-2.jpg
when I try the same with HTTP it is working fine
Background Transfer Sample UWP application will crash when I am using FTP URL. working fine with FTP URL
Developer technologies | Universal Windows Platform (UWP)
{count} votes
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(156.8, 46%, 25%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAM%3C/text%3E%3C/svg%3E)
AryaDing-MSFT 2,916 Reputation points2021-07-23T06:19:24.507+00:00 @raju somala Could you please tell me what method you use to escape the Uri string? EscapeUriString or EscapeDataString ?
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raju somala 21 Reputation points
2021-07-24T15:18:48.1+00:00 Hi,
Thanks for your reply. We are using EscapeDatastring. After your comment, I used EscapeUriString to verify but no change in behavior.
string escapeString = Uri.EscapeUriString("お役立ち情報投稿アーカイブ0707 - 2.jpg");
sstring url = "ftp://admin:admin@X .XXX.XXX.XXX/Folder1/Folder 2/" + escapeString;
if (!Uri.TryCreate(url.Trim(), UriKind.Absolute, out baseUri))
{
//rootPage.NotifyUser("Invalid URI.", NotifyType.ErrorMessage);
return;
}The output of Uri.TryCreate baseUri is used to pass DownloadOperation Parameter.
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AryaDing-MSFT 2,916 Reputation points
2021-07-27T05:54:34.843+00:00 @raju somala You could try to encode the original string to ASCII bytes first, and then encode it back to UTF8. As follows:
Uri.EscapeUriString(Encoding.UTF8.GetString(Encoding.ASCII.GetBytes(filename)));. -
raju somala 21 Reputation points
2021-07-28T06:46:42.307+00:00 Hi , i tried the suggested UTF8 , but not helpful.
string escapeString=Uri.EscapeUriString(Encoding.UTF8.GetString(Encoding.ASCII.GetBytes("お役立ち情報投稿アーカイブ0707 - 2.jpg")));
ftp://usrname:pwd@192.168.1.8/Folder1/Folder2/?????????????0707%20-%202.jpg
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Anonymous2021-07-29T08:30:57.023+00:00 Have you tried to download some other files with Japanese names using Background Downloader? Not from your FTP server, try with other servers. Will it give the same issue?
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raju somala 21 Reputation points
2021-07-30T05:45:14.66+00:00 On the same server, i installed the FileZilla server. and tried to download the files with Japanese names. All are working fine. I am able to download .
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Anonymous
2021-07-30T09:16:31.74+00:00 What we need to confirm is whether this Background Downloader behavior happens on all kinds of servers when downloading files named in Japanese. Or it just happens on FTP server.
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raju somala 21 Reputation points
2021-08-02T17:10:16.667+00:00 Hi , I have used (https://github.com/robinrodricks/FluentFTP) , i am able to download files named Japanese.
The library has a method to DisableUTF8, when i used this method before downloading then files named Japanese are not downloading.
I suspect background download has similar functionality or not. -
Anonymous
2021-08-04T03:26:25.653+00:00 Hi , I have used (https://github.com/robinrodricks/FluentFTP) , i am able to download files named Japanese.
Do you mean you could download files named Japanese using the UWP background downloader? So the issue only happens to your own FTP server, right?
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raju somala 21 Reputation points
2021-08-04T07:27:39.197+00:00 I mean i am able to download via Flunet FTP but not with a background downloader.
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Anonymous
2021-08-05T06:20:31.147+00:00 We need to narrow down the issue and it will help to use find out the reason for this issue. That's why we need to check whether the background downloader could download files with Japanese names from other FTP files. If the background downloader could download files with Japanese names from other FTP servers, the issue might be related to your own FTP server.
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raju somala 21 Reputation points
2021-08-06T05:41:49.887+00:00 Yes background downloaders is able to download files with japanese names from other FTP servers like FileZilla. But with IIS server it is not able to download.
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Anonymous
2021-08-09T07:07:10.85+00:00 Have you tried other IIS servers that deployed on other devices? Not your server deployed on other devices. Does this behavior only happen to the FTP server that you built?
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