Question

我有两个包含文件夹路径的字符串。有没有办法确定他们是否以某种方式指向同一位置？考虑到不区分大小写，8.3文件名长度修改，替换等等，字符串比较似乎有点不可靠。

为了说明，我怎样才能确定这两个指向同一个地方：

String1 = "c:\Program Files\MyFolder\"
String2 = "C:\PROGRA~1\MYFOLDER"

Answer 1

以下代码适用于文件（包括硬链接）和目录（包括联结），但两条路径都必须有效！

#include <windows.h>
#include <stdio.h>

BOOL ArePathsEqual(LPCTSTR path1,LPCTSTR path2) 
{
    BY_HANDLE_FILE_INFORMATION bhfi1,bhfi2;
    HANDLE h1, h2 = NULL;
    DWORD access = 0;
    DWORD share = FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE;

    h1 = CreateFile(path1,access,share,NULL,OPEN_EXISTING,(GetFileAttributes(path1)&FILE_ATTRIBUTE_DIRECTORY)?FILE_FLAG_BACKUP_SEMANTICS:0,NULL);
    if (INVALID_HANDLE_VALUE != h1) 
    {
        if (!GetFileInformationByHandle(h1,&bhfi1)) bhfi1.dwVolumeSerialNumber = 0;
        h2 = CreateFile(path2,access,share,NULL,OPEN_EXISTING,(GetFileAttributes(path2)&FILE_ATTRIBUTE_DIRECTORY)?FILE_FLAG_BACKUP_SEMANTICS:0,NULL);
        if (!GetFileInformationByHandle(h2,&bhfi2)) bhfi2.dwVolumeSerialNumber = bhfi1.dwVolumeSerialNumber + 1;
    }
    CloseHandle(h1);
    CloseHandle(h2);
    return INVALID_HANDLE_VALUE != h1 && INVALID_HANDLE_VALUE != h2 
    && bhfi1.dwVolumeSerialNumber==bhfi2.dwVolumeSerialNumber
    && bhfi1.nFileIndexHigh==bhfi2.nFileIndexHigh
    && bhfi1.nFileIndexLow==bhfi2.nFileIndexLow ;
}

void main() 
{
    BOOL bRet = ArePathsEqual("c:\\program files","c:\\progra~1");
    printf("ArePathsEqual: %d\n",bRet);
}

Answer 2

为了获得最佳性能，您应该减少规范形式的路径。这是8.3（GetShortPathName）和小写。

Answer 3

这是一个C＃样本。如果你使用其他语言，那么这个想法是一样的。使用来自kernel32.dll的GetLongPathName和/或GetShortPathName并进行比较：

 [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
 public static extern int GetLongPathName(
    [MarshalAs(UnmanagedType.LPTStr)]
    string path,
    [MarshalAs(UnmanagedType.LPTStr)]
    StringBuilder longPath,
    int longPathLength
    );

 [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
 public static extern int GetShortPathName(
    [MarshalAs(UnmanagedType.LPTStr)]
    string path,
    [MarshalAs(UnmanagedType.LPTStr)]
    StringBuilder shortPath,
    int shortPathLength
    );


function bool PathsAreEqual(string path1, string path2)
{
    StringBuilder shortPath1 = new StringBuilder(255);
    StringBuilder shortPath2 = new StringBuilder(255);
    GetShortPathName(path1, shortPath1, shortPath1.Capacity);
    GetShortPathName(path2, shortPath2, shortPath2.Capacity);

    return shortPath1.ToString().ToLower() == shortPath2.ToString().ToLower();

}

确定两个目录名是否指向同一目录

3 个答案: