C#中使用SHBrowseForFolder匯出中文資料夾

C# · 發表 2018-11-03 16:57:53

摘要： Unity專案開發筆記(十七) 從業以來,數次踩中編碼的坑, 這次又馬失前蹄 , 真是事不過三此非彼白. 本來這個小問題不打算拿出來說 , 但是翻看谷歌發現若干年前也有寥寥數人遇到碰到這個問題 ,而且都並沒有給出一個可行的解決方案 ,現在問題依然掛在CSDN等地方 , 似乎不會再有人去...

Unity專案開發筆記(十七)

從業以來,數次踩中編碼的坑, 這次又馬失前蹄 , 真是事不過三此非彼白.

本來這個小問題不打算拿出來說 , 但是翻看谷歌發現若干年前也有寥寥數人遇到碰到這個問題 ,而且都並沒有給出一個可行的解決方案 ,現在問題依然掛在CSDN等地方 , 似乎不會再有人去回答了, 或者其實題主們後面解決了但並沒有回頭來提供解決方案. 現在由我來”終結此貼”

0x00.使用SHBrowseForFolder選擇資料夾

(大段程式碼來襲 , 不想看可直接拉到底看關鍵的幾行)

底層介面 – 選擇資料夾相關

//-------------------------------------------------------------------------
class Win32API
{
// C# representation of the IMalloc interface.
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
Guid("00000002-0000-0000-C000-000000000046")]
public interface IMalloc
{
[PreserveSig]
IntPtr Alloc([In] int cb);
[PreserveSig]
IntPtr Realloc([In] IntPtr pv, [In] int cb);
[PreserveSig]
void Free([In] IntPtr pv);
[PreserveSig]
int GetSize([In] IntPtr pv);
[PreserveSig]
int DidAlloc(IntPtr pv);
[PreserveSig]
void HeapMinimize();
}

[StructLayout(LayoutKind.Sequential, Pack = 8)]
public struct BROWSEINFO
{
public IntPtr hwndOwner;
public IntPtr pidlRoot;
public IntPtr pszDisplayName;
[MarshalAs(UnmanagedType.LPTStr)]
public string lpszTitle;
public int ulFlags;
[MarshalAs(UnmanagedType.FunctionPtr)]
public Shell32.BFFCALLBACK lpfn;
public IntPtr lParam;
public int iImage;
}

[Flags]
public enum BffStyles
{
RestrictToFilesystem = 0x0001, // BIF_RETURNONLYFSDIRS
RestrictToDomain = 0x0002, // BIF_DONTGOBELOWDOMAIN
RestrictToSubfolders = 0x0008, // BIF_RETURNFSANCESTORS
ShowTextBox = 0x0010, // BIF_EDITBOX
ValidateSelection = 0x0020, // BIF_VALIDATE
NewDialogStyle = 0x0040, // BIF_NEWDIALOGSTYLE
BrowseForComputer = 0x1000, // BIF_BROWSEFORCOMPUTER
BrowseForPrinter = 0x2000, // BIF_BROWSEFORPRINTER
BrowseForEverything = 0x4000, // BIF_BROWSEINCLUDEFILES
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class OpenFileName
{
public int structSize = 0;
public IntPtr dlgOwner = IntPtr.Zero;
public IntPtr instance = IntPtr.Zero;
public String filter = null;
public String customFilter = null;
public int maxCustFilter = 0;
public int filterIndex = 0;
public String file = null;
public int maxFile = 0;
public String fileTitle = null;
public int maxFileTitle = 0;
public String initialDir = null;
public String title = null;
public int flags = 0;
public short fileOffset = 0;
public short fileExtension = 0;
public String defExt = null;
public IntPtr custData = IntPtr.Zero;
public IntPtr hook = IntPtr.Zero;
public String templateName = null;
public IntPtr reservedPtr = IntPtr.Zero;
public int reservedInt = 0;
public int flagsEx = 0;
}

public class Shell32
{
public delegate int BFFCALLBACK(IntPtr hwnd, uint uMsg, IntPtr lParam, IntPtr lpData);

[DllImport("Shell32.DLL")]
public static extern int SHGetMalloc(out IMalloc ppMalloc);

[DllImport("Shell32.DLL")]
public static extern int SHGetSpecialFolderLocation(
IntPtr hwndOwner, int nFolder, out IntPtr ppidl);

[DllImport("Shell32.DLL")]
public static extern int SHGetPathFromIDList(
IntPtr pidl, byte[] pszPath);

[DllImport("Shell32.DLL", CharSet = CharSet.Auto)]
public static extern IntPtr SHBrowseForFolder(ref BROWSEINFO bi);
}

public class User32
{
public delegate bool delNativeEnumWindowsProc(IntPtr hWnd, IntPtr lParam);

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool EnumWindows(delNativeEnumWindowsProc callback, IntPtr extraData);

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern int GetWindowThreadProcessId(HandleRef handle, out int processId);
}
}
//-------------------------------------------------------------------------
class Win32Instance
{
//-------------------------------------------------------------------------
private HandleRef unityWindowHandle;
private bool bUnityHandleSet;
//-------------------------------------------------------------------------
public IntPtr GetHandle(ref bool bSuccess)
{
bUnityHandleSet = false;
Win32API.User32.EnumWindows(__EnumWindowsCallBack, IntPtr.Zero);
bSuccess = bUnityHandleSet;
return unityWindowHandle.Handle;
}
//-------------------------------------------------------------------------
private bool __EnumWindowsCallBack(IntPtr hWnd, IntPtr lParam)
{
int procid;

int returnVal =
Win32API.User32.GetWindowThreadProcessId(new HandleRef(this, hWnd), out procid);

int currentPID = System.Diagnostics.Process.GetCurrentProcess().Id;

HandleRef handle =
new HandleRef(this, 
System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle);

if (procid == currentPID)
{
unityWindowHandle = new HandleRef(this, hWnd);
bUnityHandleSet = true;
return false;
}

return true;
}
}
//-------------------------------------------------------------------------

簡單介紹一下 Win32API 所有介面的結構體都是參照SHBrowseForFolder函式而寫 , Win32Instance 主要是精確的獲取當前程序的ID

接下來是獲取資料夾路徑的簡單例子

//-------------------------------------------------------------------------
privatevoid __SelectFolder(out string directoryPath)
{
directoryPath = "null";
try
{
IntPtr pidlRet = IntPtr.Zero;
int publicOptions = (int)Win32API.BffStyles.RestrictToFilesystem |
(int)Win32API.BffStyles.RestrictToDomain;
int privateOptions = (int)Win32API.BffStyles.NewDialogStyle;

// Construct a BROWSEINFO.
Win32API.BROWSEINFO bi = new Win32API.BROWSEINFO();
IntPtr buffer = Marshal.AllocHGlobal(1024);
int mergedOptions = (int)publicOptions | (int)privateOptions;
bi.pidlRoot = IntPtr.Zero;
bi.pszDisplayName = buffer;
bi.lpszTitle = "資料夾";
bi.ulFlags = mergedOptions;

Win32Instance w = new Win32Instance();
bool bSuccess = false;
IntPtr P = w.GetHandle(ref bSuccess);
if (true == bSuccess)
{
bi.hwndOwner = P;
}

pidlRet = Win32API.Shell32.SHBrowseForFolder(ref bi);
Marshal.FreeHGlobal(buffer);

if (pidlRet == IntPtr.Zero)
{
// User clicked Cancel.
return;
}

byte[] pp = new byte[2048];
if (0 == Win32API.Shell32.SHGetPathFromIDList(pidlRet, pp))
{
return;
}

int nSize = 0;
for (int i = 0; i < 2048; i++)
{
if (0 != pp[i])
{
nSize++;
}
else
{
break;
}

}

if (0 == nSize)
{
return;
}

byte[] pReal = new byte[nSize];
Array.Copy(pp, pReal, nSize);
// 關鍵轉碼部分
Gb2312Encoding gbk = new Gb2312Encoding();
Encoding utf8 = Encoding.UTF8;
byte[] utf8Bytes = Encoding.Convert(gbk, utf8, pReal);
string utf8String = utf8.GetString(utf8Bytes);
utf8String = utf8String.Replace("\0", "");
directoryPath = utf8String.Replace("\\", "/") + "/";

}
catch (Exception e)
{
Console.WriteLine("獲取資料夾目錄出錯:" + e.Message);
}
}

以上用到的一個GBK轉碼庫位置檢視 -ofollow,noindex" target="_blank">github傳送門

0x01.GBK轉碼

以下是關鍵的一段程式碼:

Gb2312Encoding gbk = new Gb2312Encoding();
Encoding utf8 = Encoding.UTF8;
byte[] utf8Bytes = Encoding.Convert(gbk, utf8, pReal);
string utf8String = utf8.GetString(utf8Bytes);
utf8String = utf8String.Replace("\0", "");

谷歌上找到的一個方案是把專案編碼全部改為unicode , 但是C#專案裡貌似沒這個設定 , 所以使用SHGetPathFromIDList拿出的資料直接轉碼即可支援中文.(全部為英文的路徑也不會有影響)

-EOF-

C#中使用SHBrowseForFolder匯出中文資料夾

0x00.使用SHBrowseForFolder選擇資料夾

0x01.GBK轉碼

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