How to? Determine size of file via download link

[Joe Caverly]

I am able to determine the size of a file before I download it using curl

Examples;

and

Using TCC, is there a method of getting the size of a file (Content-Length) via the download link, as I am presently doing with curl?

Thanks from Joe

 

[vefatica]

4UTILS has @IFILESIZE but it doesn't work via FTP.

v:\> echo %@ifilesize[jpsoft.com/downloads/v16/tcmd.exe]
21593248

How about good old fashioned brute force?

v:\> echo %@strip[^,,%@word[" ",2,%@execstr[dir /m /k ftp://lucky.syr.edu/4plugins/4autotray.zip]]]
106231

 

[rconn]

HTTP(S) doesn't provide a means to get the file size. The only way to do that is with FTP.

 

[vefatica]

HTTP(S) doesn't provide a means to get the file size. The only way to do that is with FTP.

I don't know about HTTP itself, but you can do it with WININET functions.
InternetOpen()
InternetConnect() with nServerPort ==INTERNET_DEFAULT_HTTP_PORT
HttpOpenRequest() with the verb L"HEAD"
HttpSendRequest()
HttpQueryInfo() with dwInfoLevel == HTTP_QUERY_CONTENT_LENGTH

You can also use HTTP_QUERY_LAST_MODIFIED.

I haven't tried it, but you can InternetConnect() with INTERNET_DEFAULT_HTTPS_PORT also.

 

[vefatica]

Here's a cute way with two examples of its use.

v:\> function ftpsize `%@word[1,%@execstr[1,iftp /v ftp://%1 > NUL & iftp /s size %2 & iftp /c]]`

v:\> echo %@ftpsize[lucky.syr.edu/4plugins,4autotray.zip]
106231

v:\> echo %@ftpsize[lucky.syr.edu/,4plugins/4autotray.zip]
106231

I don't know if a server's response to the SIZE command has a standard format. If not, the above may not work everywhere.

 

[vefatica]

HTTP(S) doesn't provide a means to get the file size. The only way to do that is with FTP.

According to IPWorks, their v9 HTTP component supports the HEAD method:

Head Fetches the document headers using the HTTP HEAD method

This might allow TCC to get the size and date of a resource without getting the resource itself.

 

[Joe Caverly]

HTTP(S) doesn't provide a means to get the file size. The only way to do that is with FTP.

Not sure how curl does it, but curl does indeed allow me to get the file size via an HTTP link. See the example in my previous post.

Source code for curl is available here.

Visual C++ build instructions here.

This is the function I am presently using,

urlsize=%@word[1,%@execstr[curl --head --insecure --silent %1 | find "Content-Length"]]

Joe

 

[Joe Caverly]

Vince, thanks for the info on the %@ifilesize function from 4UTILS.

I downloaded the plugin, but it does not seem to work for me;

Joe

 

[vefatica]

Hmmm! I remember making changes which broke the plugins on Windows XP. Here, the one you have works OK with TCCv17 on Windows 7. I don't remember how if fared on Vista. Perhaps Rex will know what's going on. I don't know if I'll be able to fix it.

 

[Joe Caverly]

Hmmm! I remember making changes which broke the plugins on Windows XP. Here, the one you have works OK with TCCv17 on Windows 7. I don't remember how if fared on Vista. Perhaps Rex will know what's going on. I don't know if I'll be able to fix it.

I did some searching, and found an older copy of 4UTILS, and it works;

Joe

 

[vefatica]

Good! I might have found the problem (PSAPI functions moved between Vista and Win7) but I'm not sure how to fix it and I can't test. I hope you're happy for now.

 

[vefatica]

Here's another similar one for a file's last write time. It's UTC and a datetime but it's better than nothing.

v:\> function ftptime `%@word[1,%@execstr[1,iftp /v ftp://%1 > NUL & iftp /s mdtm %2 & iftp /c]]`

v:\> echo %@ftptime[lucky.syr.edu/,4plugins/4autotray.zip]
20141202055606.452

 

[Joe Caverly]

Vince, thanks for the ftptime function. Unfortunately, it does not work on http.

curl, however, does provide the files last modified date and time;

Thus;

Your @ifiletime returns the same results;

Joe

 

[vefatica]

If 4UTILS is working for you, @IFILETIME will work for HTTP (and not for FTP).