使用IFileOperation一个复制过程中创建的目录 [英] Creating directories during a copy using IFileOperation

问题描述

使用C＃的斯蒂芬Toub的IFileOperation包装（链接），这一直很好，直到如今。现在我试图做一个副本收集来自网络位置，每个网络位置到它自己的子目录中的文件。

Using Stephen Toub's IFileOperation wrapper for C# (link), which has been working well until now. Now I am trying to do a copy to gather files from network locations, each network location into its own subdirectory.

\\FOO\\ \\data 到 C：\gather\Foo_data 结果
\\BAR\\ \\manage\current 到 C：\gather\bar\manage

等。问题出在 FileOperation.CopyItem 。那一定是因为目标目录尚不存在 - IFileOperation 将在复制期间创建它，对吗？我使用的技术从另一个问题并改变Toub的 FileOperation.CreateShellItem 来的：

And so on. The problem is in FileOperation.CopyItem. It must be because the destination directory doesn't exist yet—IFileOperation will create it during the copy, right? I used the technique from another question and changed Toub's FileOperation.CreateShellItem to this:

private static ComReleaser<IShellItem> CreateShellItem( string path )
{
    try
    {
        return new ComReleaser<IShellItem>( (IShellItem)SHCreateItemFromParsingName( path, null, ref _shellItemGuid ) );
    }
    catch ( FileNotFoundException )
    {
        IntPtr pidl = SHSimpleIDListFromPath( path );
        IShellItem isi = (IShellItem)SHCreateItemFromIDList( pidl, ref _shellItemGuid );
        Marshal.FreeCoTaskMem( pidl );
        System.Diagnostics.Debug.WriteLine( "Shell item: " + isi.GetDisplayName( SIGDN.DesktopAbsoluteParsing ) );
        return new ComReleaser<IShellItem>( isi );
    }
}

我坚持了调试。的WriteLine 在那里，以检查它的工作，它似乎是做工精细;回写出来的路径。

I stuck the Debug.WriteLine in there to check that it's working, and it seems to be working fine; it writes the path back out.

但 IFileOperation.CopyItem 引发的ArgumentException ，我想不通为什么。我不能做了的IShellItem 为不存在的文件是否正确？我怀疑我需要获得 SFGAO_FOLDER 在那里，因为我想要创建一个的IShellItem 为一个不存在的目录，不是一个文件，而是如何？

But IFileOperation.CopyItem throws an ArgumentException, and I can't figure out why. Am I not doing the "IShellItem for a nonexistent file" correctly? I suspect I need to get SFGAO_FOLDER in there, since I am trying to create an IShellItem for a nonexistent directory, not file, but how?

推荐答案

很多谷歌搜索和编码实验本周末之后（什么疯狂的派对周末），我找到了解决办法。

After a lot of Googling and coding experimentation this weekend (what a wild party weekend), I found a solution.

1. 写COM兼容的类，它实现 IFileSystemBindData 。


2. 分配一个 WIN32_FIND_DATA 结构，并设置其 dwFileAttributes = FILE_ATTRIBUTE_DIRECTORY 。 （其他成员是这里无关紧要，因为据我一些测试后说。）


3. 创建您的 IFileSystemBindData 类的一个实例


4. 通过你的 WIN32_FIND_DATA 对象 IFileSystemBindData :: SetFindData 。


5. 创建的实例 IBindCtx 。


6. 调用它的 IBindCtx :: RegisterObjectParam 与 STR_FILE_SYS_BIND_DATA 的参数（的#define D为→ 文件系统将数据绑定）和你的 IFileSystemBindData 对象。


7. 呼叫 SHCreateItemFromParsingName 与目录的路径名来创建，你的 IBindCtx 对象。

1. Write a COM-compatible class that implements IFileSystemBindData.
2. Allocate a WIN32_FIND_DATA structure and set its dwFileAttributes = FILE_ATTRIBUTE_DIRECTORY. (The other members are irrelevant here, as far as I can tell after some testing.)
3. Create an instance of your IFileSystemBindData class.
4. Pass your WIN32_FIND_DATA object to IFileSystemBindData::SetFindData.
5. Create an instance of IBindCtx.
6. Call its IBindCtx::RegisterObjectParam with arguments of STR_FILE_SYS_BIND_DATA (#defined as L"File System Bind Data") and your IFileSystemBindData object.
7. Call SHCreateItemFromParsingName with the pathname of the directory to create, and your IBindCtx object.

它的工作原理。结合上下文对象告诉 SHCreateItemFromParsingName 不是查询文件系统，而只是用它给了。我得到了 IFileOperation 将文件复制到新的和巧妙地命名的目录 D：\Some\Path\That\Did\ Not\Previously\Exist ，它创造了沿途的所有七个目录。据推测，这同样的技术可以被用来创建一个的IShellItem 任何不存在的文件系统对象，这取决于你把什么 dwFileAttributes 。

It works. The binding-context object tells SHCreateItemFromParsingName not to query the filesystem, and just use what it's given. I got IFileOperation to copy a file into the new and cleverly-named directory D:\Some\Path\That\Did\Not\Previously\Exist, and it created all seven directories along the way. Presumably this same technique could be used to create an IShellItem for any non-existent filesystem object, depending on what you put in dwFileAttributes.

但它的丑陋。我希望有一个更好的办法。我的编码实验是用C ++;现在写的COM互操作的东西在C＃中做一遍。或者，也许它会更容易抛出了项目，并在C ++中开始了。

But it's ugly. I hope there's a better way. My coding experimentation was in C++; now to write the COM interop stuff to do it again in C#. Or maybe it will be easier to throw out the project and start over in C++.

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