如何在 C# 中以编程方式判断非托管DLL 文件是 x86 还是 x64?
5 回答
请参阅规格。这是一个基本的实现:
public static MachineType GetDllMachineType (string dllPath)
{
// See http://www.microsoft.com/whdc/system/platform/firmware/PECOFF.mspx
// Offset to PE header is always at 0x3C.
// The PE header starts with "PE\0\0" = 0x50 0x45 0x00 0x00,
// followed by a 2-byte machine type field (see the document above for the enum).
//
using (var fs = new FileStream (dllPath, FileMode.Open, FileAccess.Read))
using (var br = new BinaryReader (fs))
{
fs.Seek (0x3c, SeekOrigin.Begin);
Int32 peOffset = br.ReadInt32();
fs.Seek (peOffset, SeekOrigin.Begin);
UInt32 peHead = br.ReadUInt32();
if (peHead != 0x00004550) // "PE\0\0", little-endian
throw new Exception ("Can't find PE header");
return (MachineType)br.ReadUInt16();
}
}
MachineType
枚举定义为:
public enum MachineType : ushort
{
IMAGE_FILE_MACHINE_UNKNOWN = 0x0,
IMAGE_FILE_MACHINE_AM33 = 0x1d3,
IMAGE_FILE_MACHINE_AMD64 = 0x8664,
IMAGE_FILE_MACHINE_ARM = 0x1c0,
IMAGE_FILE_MACHINE_EBC = 0xebc,
IMAGE_FILE_MACHINE_I386 = 0x14c,
IMAGE_FILE_MACHINE_IA64 = 0x200,
IMAGE_FILE_MACHINE_M32R = 0x9041,
IMAGE_FILE_MACHINE_MIPS16 = 0x266,
IMAGE_FILE_MACHINE_MIPSFPU = 0x366,
IMAGE_FILE_MACHINE_MIPSFPU16 = 0x466,
IMAGE_FILE_MACHINE_POWERPC = 0x1f0,
IMAGE_FILE_MACHINE_POWERPCFP = 0x1f1,
IMAGE_FILE_MACHINE_R4000 = 0x166,
IMAGE_FILE_MACHINE_SH3 = 0x1a2,
IMAGE_FILE_MACHINE_SH3DSP = 0x1a3,
IMAGE_FILE_MACHINE_SH4 = 0x1a6,
IMAGE_FILE_MACHINE_SH5 = 0x1a8,
IMAGE_FILE_MACHINE_THUMB = 0x1c2,
IMAGE_FILE_MACHINE_WCEMIPSV2 = 0x169,
IMAGE_FILE_MACHINE_ARM64 = 0xaa64
}
我只需要其中三个,但为了完整起见,我将它们都包括在内。最终 64 位检查:
// Returns true if the dll is 64-bit, false if 32-bit, and null if unknown
public static bool? UnmanagedDllIs64Bit(string dllPath)
{
switch (GetDllMachineType(dllPath))
{
case MachineType.IMAGE_FILE_MACHINE_AMD64:
case MachineType.IMAGE_FILE_MACHINE_IA64:
return true;
case MachineType.IMAGE_FILE_MACHINE_I386:
return false;
default:
return null;
}
}
使用 Visual Studio 命令提示符,dumpbin /headers dllname.dll 也可以工作。在我的机器上,输出的开头说:
FILE HEADER VALUES
8664 machine (x64)
5 number of sections
47591774 time date stamp Fri Dec 07 03:50:44 2007
更简单:查看 System.Reflection.Module 类。它包括 GetPEKind 方法,该方法返回 2 个描述代码类型和 CPU 目标的枚举。没有更多的十六进制!
(这篇内容丰富的帖子的其余部分无耻地从http://www.developersdex.com/vb/message.asp?p=2924&r=6413567复制)
示例代码:
Assembly assembly = Assembly.ReflectionOnlyLoadFrom(@"<assembly Path>");
PortableExecutableKinds kinds;
ImageFileMachine imgFileMachine;
assembly.ManifestModule.GetPEKind(out kinds, out imgFileMachine);
PortableExecutableKinds 可以用来检查什么样的程序集。它有 5 个值:
ILOnly:可执行文件仅包含 Microsoft 中间语言 (MSIL),因此与 32 位或 64 位平台无关。
NotAPortableExecutableImage:该文件不是可移植可执行 (PE) 文件格式。
PE32Plus:可执行文件需要 64 位平台。
Required32Bit:可执行文件可以在 32 位平台上运行,也可以在 64 位平台上的 32 位 Windows on Windows (WOW) 环境中运行。
Unmanaged32Bit:可执行文件包含纯非托管代码。
以下是链接:
Module.GetPEKind 方法:http: //msdn.microsoft.com/en-us/library/system.reflection.module.getpekind.aspx
PortableExecutableKinds 枚举: http: //msdn.microsoft.com/en-us/library/system.reflection.portableexecutablekinds (VS.80).aspx
ImageFileMachine 枚举:http: //msdn.microsoft.com/en-us/library/system.reflection.imagefilemachine.aspx
而不是Assembly.LoadFile
,使用Assembly.ReflectionOnlyLoadFrom
. 这将让您解决“错误的图像格式”异常。
我知道自从更新以来已经有一段时间了。通过将文件加载到它自己的 AppDomain 中,我能够摆脱“错误的图像格式”异常。
private static (string pkName, string imName) FindPEKind(string filename)
{
// some files, especially if loaded into memory
// can cause errors. Thus, load into their own appdomain
AppDomain tempDomain = AppDomain.CreateDomain(Guid.NewGuid().ToString());
PEWorkerClass remoteWorker =
(PEWorkerClass)tempDomain.CreateInstanceAndUnwrap(
typeof(PEWorkerClass).Assembly.FullName,
typeof(PEWorkerClass).FullName);
(string pkName, string imName) = remoteWorker.TryReflectionOnlyLoadFrom_GetManagedType(filename);
AppDomain.Unload(tempDomain);
return (pkName, imName);
}
此时,我执行以下操作:
public (string pkName, string imName) TryReflectionOnlyLoadFrom_GetManagedType(string fileName)
{
string pkName;
string imName;
try
{
Assembly assembly = Assembly.ReflectionOnlyLoadFrom(assemblyFile: fileName);
assembly.ManifestModule.GetPEKind(
peKind: out PortableExecutableKinds peKind,
machine: out ImageFileMachine imageFileMachine);
// Any CPU builds are reported as 32bit.
// 32bit builds will have more value for PortableExecutableKinds
if (peKind == PortableExecutableKinds.ILOnly && imageFileMachine == ImageFileMachine.I386)
{
pkName = "AnyCPU";
imName = "";
}
else
{
PortableExecutableKindsNames.TryGetValue(
key: peKind,
value: out pkName);
if (string.IsNullOrEmpty(value: pkName))
{
pkName = "*** ERROR ***";
}
ImageFileMachineNames.TryGetValue(
key: imageFileMachine,
value: out imName);
if (string.IsNullOrEmpty(value: pkName))
{
imName = "*** ERROR ***";
}
}
return (pkName, imName);
}
catch (Exception ex)
{
return (ExceptionHelper(ex), "");
}
}
对我的 Widows\Assembly 目录运行它可以让我处理超过 3600 个文件的零错误。注意:我使用字典来加载返回的值。
我希望它有所帮助。YMMV