获取c#中的unicode目录名
本文关键字:unicode 中的 获取 | 更新日期: 2023-09-27 18:04:33
我正在尝试使用以下代码从我的usb驱动器获取所有目录
DirectoryInfo di = new DirectoryInfo("H:''");
DirectoryInfo[] allDir = di.GetDirectories();
这段代码适用于ASCII名称的目录。但是其中一个目录的名字是" "(unicode值U+00A0)。GetDirectories()无法获取该目录。是否有一种方法来获得目录与unicode名称?
好了,你要对抗的是。net框架使用FindFirstFile
:
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true, BestFitMapping = false)]
internal static SafeFindHandle FindFirstFile(string fileName, [In, Out] Win32Native.WIN32_FIND_DATA data);
更糟的是,你在和语言作斗争:
为目标操作系统自动封送字符串。Windows NT、Windows 2000、Windows XP和Windows Server 2003系列的默认值是Unicode;在Windows 98和Windows Me上默认为Ansi。虽然公共语言运行时默认值为Auto,但语言可以覆盖此默认值。例如,c#默认将所有方法和类型标记为Ansi。
(来自CharSet
枚举文档强调添加)
当前的问题是DllImport
上的CharSet
参数。这意味着你只剩下一种方法;您可以自己使用P/Invoke。你需要很多东西。首先需要返回的数据结构:
[BestFitMapping(false)]
[Serializable]
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
internal class WIN32_FIND_DATA
{
internal int dwFileAttributes;
internal uint ftCreationTime_dwLowDateTime;
internal uint ftCreationTime_dwHighDateTime;
internal uint ftLastAccessTime_dwLowDateTime;
internal uint ftLastAccessTime_dwHighDateTime;
internal uint ftLastWriteTime_dwLowDateTime;
internal uint ftLastWriteTime_dwHighDateTime;
internal int nFileSizeHigh;
internal int nFileSizeLow;
internal int dwReserved0;
internal int dwReserved1;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
internal string cFileName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
internal string cAlternateFileName;
[TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
public WIN32_FIND_DATA()
{
}
}
接下来需要正确导入FindFirstFile
:
[DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true, BestFitMapping = false)]
internal static SafeFindHandle FindFirstFile(string fileName, [In, Out] Win32Native.WIN32_FIND_DATA data);
接下来你需要GetLastWin32Error
来检查错误;可以通过InteropServices
命名空间中的Marshal.GetLastWin32Error
访问。
接下来需要迭代,所以需要FindNextFile
:
[DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true, BestFitMapping = false)]
internal static bool FindNextFile(SafeFindHandle hndFindFile, [MarshalAs(UnmanagedType.LPStruct), In, Out] Win32Native.WIN32_FIND_DATA lpFindFileData);
有了这些,你就可以构建自己的迭代器了。但是,为了您的利益,这里是微软为"init"做的:
[SecurityCritical]
private void CommonInit()
{
string fileName = Path.InternalCombine(this.searchData.fullPath, this.searchCriteria);
Win32Native.WIN32_FIND_DATA wiN32FindData = new Win32Native.WIN32_FIND_DATA();
this._hnd = Win32Native.FindFirstFile(fileName, wiN32FindData);
if (this._hnd.IsInvalid)
{
int lastWin32Error = Marshal.GetLastWin32Error();
switch (lastWin32Error)
{
case 2:
case 18:
this.empty = this.searchData.searchOption == SearchOption.TopDirectoryOnly;
break;
default:
this.HandleError(lastWin32Error, this.searchData.fullPath);
break;
}
}
if (this.searchData.searchOption == SearchOption.TopDirectoryOnly)
{
if (this.empty)
{
this._hnd.Dispose();
}
else
{
SearchResult searchResult = this.CreateSearchResult(this.searchData, wiN32FindData);
if (!this._resultHandler.IsResultIncluded(searchResult))
return;
this.current = this._resultHandler.CreateObject(searchResult);
}
}
else
{
this._hnd.Dispose();
this.searchStack.Add(this.searchData);
}
}
,这里是他们对"iterate"所做的,对于你正在寻找的内容:
if (this.searchData != null && this._hnd != null)
{
while (Win32Native.FindNextFile(this._hnd, wiN32FindData))
{
SearchResult searchResult = this.CreateSearchResult(this.searchData, wiN32FindData);
if (this._resultHandler.IsResultIncluded(searchResult))
{
if (this.needsParentPathDiscoveryDemand)
{
this.DoDemand(this.searchData.fullPath);
this.needsParentPathDiscoveryDemand = false;
}
this.current = this._resultHandler.CreateObject(searchResult);
return true;
}
}
int lastWin32Error = Marshal.GetLastWin32Error();
if (this._hnd != null)
this._hnd.Dispose();
if (lastWin32Error != 0 && lastWin32Error != 18 && lastWin32Error != 2)
this.HandleError(lastWin32Error, this.searchData.fullPath);
}
注意:你不能直接使用这段代码,你必须让它适合你的解决方案,但这是API的一个巨大的开始。给你找一份dotPeek来填补空白。
注: FindFirstFile
接受的fileName
参数是进入父目录。在您的例子中,H:'
.