我试图使Windows 10的Addin（使用MAF创建）AddInProcess.exe（由AddInProcess class创建）“长路径感知”。
困难源于我不拥有AddInProcess.exe的事实。它是.NET Framework的一部分，位于C:\Windows\Microsoft.NET\Framework64\v4.0.30319\AddInProcess.exe
这就是我所做的（根据 Jeremy Kuhne的博客条目.NET 4.6.2 and long paths on Windows 10的指导）：
将AppContext和Switch.System.IO.UseLegacyPathHandling的{{1}}开关设置为Switch.System.IO.BlockLongPaths。这使得 some .NET API开始接受长路径。但是，调用{em> native win32进行的调用仍然因false或其他异常而失败。
我下一步要做的是 ，但不能做的是编辑应用程序的清单并在下面添加设置。但是，我没有一种（正确的）方法可以做到这一点。如果我可以做到这一点，它将将工作。为了证明它可以工作，我做了以下事情：
System.IO.DirectoryNotFoundException，并将其拖放到AddInProcess.exe.manifest旁边的目录中。 AddInProcess.exe具有嵌入式清单（使用sigcheck.exe检查）和embedded manifests take priority over external manifests。我通过changing a registry setting that causes external manifests to take priority解决了这个问题（出于测试目的）。AddInProcess.exe虽然上述骇客作品行之有效，但在最终用户的机器上这样做显然是不合理的，而且，它会改变 all <application xmlns="urn:schemas-microsoft-com:asm.v3">
<windowsSettings>
<longPathAware xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">true</longPathAware>
</windowsSettings>
</application>
的行为，而不仅仅是我自己的行为创建。
问题：是否存在使您无法控制（AddInProcess.exe）的流程成为AddInProcess.exe的合法方法？
是否可以在运行时更改此清单设置？
注释：
longPathAware和AppContextSwitchOverrides受到UseLegacyPathHandling的尊重。我原来是this problem，并且可以解决它。BlockLongPaths开头的路径）来获取无法开始工作的方法（因为这会导致路径长度请参阅Path Normalization博客条目。但是，这种方法的工作量更大/风险更大（尝试查找所有当前会抛出并修改路径的代码，并阻止将来的开发人员添加新用法）其他参考：
答案 0 :(得分：0)
@RbMm 在评论中建议的无记录方法（将PEB的{{1}}位设置为 1 ）有效（至少Windows 10的版本是：1903）。由于该方法是本机C / C ++方法，因此我只需要将其转换为C＃可消耗的东西。
可以使用多种方法（C ++ / CLI，pinvoke）。由于我只是在做“概念验证”，所以我决定只使用pinvoke，并且对代码的质量有点懒。
注意：
IsLongPathAwareProcess的Windows 10版本上运行。IsLongPathAwareProcess结构的开始部分，因为访问我要修改的位就足够了。PEB位的方法可能比我使用的方法（IsLongPathAwareProcess）更为简洁Marshal.StructureToPtr的调用时有效，而在未调用时失败。SetIsLongPathAwareProcess的测试代码（以便我可以在目录不存在的情况下多次重新运行测试） li>
测试代码：
C:\Test如果您在自然为 class Program
{
static void Main(string[] args)
{
SetIsLongPathAwareProcess();
string reallyLongDirectory = @"C:\Test\abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
reallyLongDirectory = reallyLongDirectory + @"\abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
reallyLongDirectory = reallyLongDirectory + @"\abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
CreateDirTest(reallyLongDirectory);
Directory.Delete(@"C:\Test", recursive: true);
}
private static void CreateDirTest(string name)
{
Console.WriteLine($"Creating a directory that is {name.Length} characters long");
// Test managed CreateDirectory
Directory.CreateDirectory(name);
// Test Native CreateDirectory. Note this method will only create the "last part" of the directory (not the full path).
// Also note that it fails if the directory already exists.
// https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createdirectorya
string nativeName = Path.Combine(name, "TestEnding");
var r = Native.CreateDirectory(nativeName, null);
if (!r)
{
int currentError = Marshal.GetLastWin32Error();
Debug.Fail($"Native.CreateDirectory failed: {currentError}");
}
}
// Adapted from https://www.pinvoke.net/default.aspx/ntdll.ntqueryinformationprocess
private static void SetIsLongPathAwareProcess()
{
var currentProcess = Process.GetCurrentProcess();
IntPtr hProc = currentProcess.Handle;
IntPtr pPbi = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(Native.PROCESS_BASIC_INFORMATION)));
IntPtr outLong = Marshal.AllocHGlobal(sizeof(long));
int status = Native.NtQueryInformationProcess(hProc, 0, pPbi, (uint)Marshal.SizeOf(typeof(Native.PROCESS_BASIC_INFORMATION)), outLong);
Marshal.FreeHGlobal(outLong);
//STATUS_SUCCESS = 0
if (status == 0)
{
var pbi = Marshal.PtrToStructure<Native.PROCESS_BASIC_INFORMATION>(pPbi);
var pPeb = pbi.PebBaseAddress;
var peb = Marshal.PtrToStructure<Native.PEB_Beginning>(pPeb);
var bitField1 = peb.BitField1;
peb.BitField1 = bitField1 | Native.PEBBitField1.IsLongPathAwareProcess;
Marshal.StructureToPtr<Native.PEB_Beginning>(peb, pPeb, false);
}
//Free allocated space
Marshal.FreeHGlobal(pPbi);
}
static class Native
{
// http://pinvoke.net/default.aspx/Structures/PROCESS_BASIC_INFORMATION.html
[StructLayout(LayoutKind.Sequential, Pack = 1)]
internal struct PROCESS_BASIC_INFORMATION
{
public IntPtr ExitStatus;
public IntPtr PebBaseAddress;
public IntPtr AffinityMask;
public IntPtr BasePriority;
public UIntPtr UniqueProcessId;
public IntPtr InheritedFromUniqueProcessId;
public int Size
{
get { return (int)Marshal.SizeOf(typeof(PROCESS_BASIC_INFORMATION)); }
}
}
[Flags]
internal enum PEBBitField1 : byte
{
None = 0,
ImageUsesLargePages = 1 << 0,
IsProtectedProcess = 1 << 1,
IsImageDynamicallyRelocated = 1 << 2,
SkipPatchingUser32Forwarders = 1 << 3,
IsPackagedProcess = 1 << 4,
IsAppContainer = 1 << 5,
IsProtectedProcessLight = 1 << 6,
IsLongPathAwareProcess = 1 << 7
}
// Note: this only contains the "beginning" of the PEB structure
// but that is all we need for access to the IsLongPathAwareProcess bit
// Used as a guide: https://github.com/processhacker/processhacker/blob/master/phnt/include/ntpebteb.h#L75
// Related: https://docs.microsoft.com/en-us/windows/win32/api/winternl/ns-winternl-peb
[StructLayout(LayoutKind.Sequential, Pack = 1)]
internal struct PEB_Beginning
{
Byte InheritedAddressSpace;
Byte ReadImageFileExecOptions;
Byte BeingDebugged;
public PEBBitField1 BitField1;
};
// https://www.pinvoke.net/default.aspx/ntdll.ntqueryinformationprocess
[DllImport("ntdll.dll", SetLastError = true)]
internal static extern int NtQueryInformationProcess(IntPtr processHandle, int processInformationClass, IntPtr processInformation, uint processInformationLength, IntPtr returnLength);
// The below is for test purposes only:
// Include CreateDirectory for testing if the long path aware changes work or not.
// Requires SECURITY_ATTRIBUTES
// http://pinvoke.net/default.aspx/kernel32/CreateDirectory.html?diff=y
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto, BestFitMapping = false)]
internal static extern bool CreateDirectory(String path, SECURITY_ATTRIBUTES lpSecurityAttributes);
// https://www.pinvoke.net/default.aspx/Structures/SECURITY_ATTRIBUTES.html
[StructLayout(LayoutKind.Sequential)]
internal class SECURITY_ATTRIBUTES
{
internal int nLength = 0;
// don't remove null, or this field will disappear in bcl.small
internal unsafe byte* pSecurityDescriptor = null;
internal int bInheritHandle = 0;
}
}
}
的控制台应用程序中使用此代码，仍然可以通过在{{1}中手动将longPathAware设置为longPathAware来测试其是否正常运行}：
false