[英]How do I detect if a drive has a recycle bin in C#?
I have an application which uses the FOF_ALLOWUNDO with SHFileOperation in order to move files to the recycle bin. 我有一个应用程序,它使用FOF_ALLOWUNDO和SHFileOperation将文件移动到回收站。
Some removable drives do not have a recycle bin. 某些可移动驱动器没有回收站。 In this case SHFileOperation deletes the files directly.
在这种情况下,SHFileOperation直接删除文件。 I want to give a warning to the user that the files are going to be deleted directly.
我想向用户发出警告,要求直接删除文件。
In order to do this I need to know if the drive has a recycle bin. 为了做到这一点,我需要知道驱动器是否有回收站。
Use FOF_WANTNUKEWARNING. 使用FOF_WANTNUKEWARNING。
Send a warning if a file is being permanently destroyed during a delete operation rather than recycled.
如果文件在删除操作期间被永久销毁而不是回收,则发送警告。 This flag partially overrides FOF_NOCONFIRMATION.
此标志部分覆盖FOF_NOCONFIRMATION。
I found a function called SHQueryRecycleBin when I looked at the functions exported by shell32.dll. 当我查看shell32.dll导出的函数时,我找到了一个名为SHQueryRecycleBin的函数。
If the drive specified in pszRootPath has a recycle bin the function returns 0 otherwise it returns -2147467259. 如果pszRootPath中指定的驱动器具有回收站,则该函数返回0,否则返回-2147467259。
I'm going to use this function via PInvoke. 我将通过PInvoke使用此功能。
I used the P/Invoke Interop Assistant to create the PInvoke code. 我使用P / Invoke Interop助手来创建PInvoke代码。
Here is the code of my function DriveHasRecycleBin : 这是我的函数DriveHasRecycleBin的代码:
[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]
private struct SHQUERYRBINFO
{
/// DWORD->unsigned int
public uint cbSize;
/// __int64
public long i64Size;
/// __int64
public long i64NumItems;
}
/// Return Type: HRESULT->LONG->int
///pszRootPath: LPCTSTR->LPCWSTR->WCHAR*
///pSHQueryRBInfo: LPSHQUERYRBINFO->_SHQUERYRBINFO*
[System.Runtime.InteropServices.DllImportAttribute("shell32.dll", EntryPoint = "SHQueryRecycleBinW")]
private static extern int SHQueryRecycleBinW([System.Runtime.InteropServices.InAttribute()] [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPTStr)] string pszRootPath, ref SHQUERYRBINFO pSHQueryRBInfo);
public bool DriveHasRecycleBin(string Drive)
{
SHQUERYRBINFO Info = new SHQUERYRBINFO();
Info.cbSize = 20; //sizeof(SHQUERYRBINFO)
return SHQueryRecycleBinW(Drive, ref Info) == 0;
}
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