Can I use IFileOperation to copy a virtual file to the local disk?

Question

Can I use IFileOperation to copy a virtual file to the local disk?

Sam Barraclough 85

I'm trying to copy files from a network stream to the local disk (with C#). I want to use the IFileOperation interface to get the modern copy UI, however I'm not sure how to get a IShellItem for a file that does not yet exist.

Currently I'm using the older IOperationsProgressDialog; which does work however I'm wanting the shell to deal with asking the user to overwite files, permssion issues ect.

My question is: how do I create an IShellItem from an IStream (or something similar) to use in IFileOperation:Copy?

RLWA32 47,696 Reputation points

2023-02-15T12:16:20.6333333+00:00

It isn't difficult to obtain an IShellItem interface for a virtual file that does not exist in the file system. This is covered, including sample code in several places.

Creating a simple pidl: For the times you care enough to send the very fake

Creating a simple shell item, just as fake as a simple pidl

ParsingWithParameters

The problem that I haven't solved is how to associate data with the IShellItem for the virtual file. ~~For example, using IFileOperation to copy the virtual file to a file system location succeeds but the file is empty.~~
RLWA32 47,696 Reputation points

2023-02-17T10:31:20.61+00:00

Are you willing to create a temporary file for the IShellItem that you hand to IFileOperation?
RLWA32 47,696 Reputation points

2023-02-19T11:27:28.6766667+00:00

Another thought is to put your virtual file into a data object and then simulate a drop on the target file system location so the shell performs the copy operation.
Sam Barraclough 85 Reputation points

2023-02-19T15:37:02.71+00:00

I have a basic working version thanks to an anwser on stackoverflow.

https://stackoverflow.com/questions/75452597/can-i-use-ifileoperation-with-virtual-files-istream

Simon's answer is exactly what I was looking for, I've managed to use that sample to copy multiple files. There are some issues however:

When using the modern dialog, if a file already exists then the dialog will display an 'out of memory' error for some reason. The other issue is that the file name does not show in the dialog.

1 answer

Your answer

RLWA32 47,696 Reputation points

2023-02-15T12:16:20.6333333+00:00

It isn't difficult to obtain an IShellItem interface for a virtual file that does not exist in the file system. This is covered, including sample code in several places.

Creating a simple pidl: For the times you care enough to send the very fake

Creating a simple shell item, just as fake as a simple pidl

ParsingWithParameters

The problem that I haven't solved is how to associate data with the IShellItem for the virtual file. ~~For example, using IFileOperation to copy the virtual file to a file system location succeeds but the file is empty.~~
RLWA32 47,696 Reputation points

2023-02-17T10:31:20.61+00:00

Are you willing to create a temporary file for the IShellItem that you hand to IFileOperation?
RLWA32 47,696 Reputation points

2023-02-19T11:27:28.6766667+00:00

Another thought is to put your virtual file into a data object and then simulate a drop on the target file system location so the shell performs the copy operation.
Sam Barraclough 85 Reputation points

2023-02-19T15:37:02.71+00:00

I have a basic working version thanks to an anwser on stackoverflow.

https://stackoverflow.com/questions/75452597/can-i-use-ifileoperation-with-virtual-files-istream

Simon's answer is exactly what I was looking for, I've managed to use that sample to copy multiple files. There are some issues however:

When using the modern dialog, if a file already exists then the dialog will display an 'out of memory' error for some reason. The other issue is that the file name does not show in the dialog.

Answer 1

Xiaopo Yang - MSFT 12,726 Microsoft External Staff

Hello,

Welcome to Microsoft Q&A!

As ShellStorage shows, you can IShellItem::BindToHandler(,BHID_Stream,); to cooperate with IStream.

        IStream *pstream;
        hr = psi->BindToHandler(pbc, BHID_Stream, IID_PPV_ARGS(&pstream));

Thank you.

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RLWA32 47,696 Reputation points

2023-02-15T12:15:43.4366667+00:00

It isn't difficult to obtain an IShellItem interface for a virtual file that does not exist in the file system. This is covered, including sample code in several places:

Creating a simple pidl: For the times you care enough to send the very fake

Creating a simple shell item, just as fake as a simple pidl

ParsingWithParameters

The problem that I haven't solved is how to associate data with the IShellItem for the virtual file. ~~For example, using IFileOperation to copy the virtual file to a file system location succeeds but the file is empty.~~

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Can I use IFileOperation to copy a virtual file to the local disk?

1 answer

Your answer