Jul 13, 2016 Remarks. URLDownloadToFile binds to a host that supports IBindHost to perform the download. To do this, it first queries the controlling IUnknown passed as pCaller for IServiceProvider, then calls IServiceProvider::QueryService with SIDSBindHost. If pCaller does not support IServiceProvider, IOleObject or IObjectWithSite is used to query the object's host container. Internet Explorer 8, 9, 10. I can see the urlmon.dll file is in my windows/system32 file path. What version? Tip: you can use msinfo32.exe for its Loaded Modules list to get that. However, I just checked mine using DependencyWalker and there is no Ordinal 459 in it, so perhaps the problem is your caller? Do you get any indication of who the.
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Downloads bits from the Internet and saves them to a file.
SyntaxParameters
Return value
This function can return one of these values.
Urlmon.dll Windows 10 DownloadRemarks
URLDownloadToFile binds to a host that supports IBindHost to perform the download. To do this, it first queries the controlling IUnknown passed as pCaller for IServiceProvider, then calls IServiceProvider::QueryService with SID_SBindHost. If pCaller does not support IServiceProvider, IOleObject or IObjectWithSite is used to query the object's host container. If no IBindHost interface is supported, or pCaller is NULL, URLDownloadToFile creates its own bind context to intercept download notifications.
URLDownloadToFile returns S_OK even if the file cannot be created and the download is canceled. If the szFileName parameter contains a file path, ensure that the destination directory exists before calling URLDownloadToFile. For best control over the download and its progress, an IBindStatusCallback interface is recommended.
Windows Internet Explorer 8. URLDownloadToFile does not support IBindStatusCallbackEx and cannot be used to download files over 4 gigabytes (GB) in size. Refer instead to IBindStatusCallbackEx::GetBindInfoEx for a code example.
Requirements
Active6 years, 1 month ago
I am creating a library of utilities to be used both in desktop environment in a web environment.
It contains several features that I believe are often repeated in my applications, including utility to get the mime type of a file by its content (not the extension).
The files that I'll have to check are the most common (jpg, png, pdf, txt) so I chose to use the external method
FindMimeFromData (link above)
The method works well, except for the two incorrect mime type of JPG (
image/pjpg ) and PNG (image/x-png ), easily solved by doing a check before the return statement.
The library is compiled for the platform AnyCPU, because it must be installed on servers/clients in both 32 and 64 bits.
At the time of testing on desktop environment all working properly for both applications compiled for x86 and x64.
at the time of testing an ASP.NET application (an empty site with an http handler for test) occurs an error of type HRESULT, and the debugger tells me that it can not provide further information.
After a few test configuration, including changing the identity of the pool to Local System (with no result), I have identified the problem:
the pool should allow 32-bit applications (see image above).
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Why?
It should not load the dll
urlmon.dll of the 64bit system where we are now?
This is a big problem, because the
FindMimeFromData method can be invoked by everywhere into this library:
the result is that an invocation of this method by another utility method may throw this exception and making it difficult to trace the problem also through debugging.
Any ideas/experience ?
Operating Systems used for testing
Desktop:
Web:
EDIT 2 (question solved)
Solved by Noseratio:
The correct type of parameters
ppwzMimeOut and pBC must be System.IntPtr instead of System.UInt32 .
I know that
System.UInt32 causes problems into full 64bit web-apps, but i don't know why.
If someone know the reason of these problems, can explain it better in a comment?
Thanks in advance
Community♦
T-motyT-moty
1 Answer
If you used the pinvoke signature from the answer your linked, it's defined there like this:
Oracle application express 11g. I would rather use the defintion from pinvoke.net:
Note the difference in types for
ppwzMimeOut and pBC parameter. In the former case, System.UInt32 is not a correct type for a 64-bit pointer under a 64-bit platform. For pBC , this is probably not an issue (as long as it is NULL), but it matters for ppwzMimeOut .
Refer to this implementation which appears to be correct.
Community♦
noserationoseratio
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