我该如何在C#中编程判断一个非托管DLL文件是x86还是x64?
请参考规范。以下是一个基本实现:
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
枚举定义如下: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
}
虽然我只需要其中的三个,但为了完整性,我都加上了。最后进行 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。在我��机器上,输出的开头是:
FILE HEADER VALUES
8664 machine (x64)
5 number of sections
47591774 time date stamp Fri Dec 07 03:50:44 2007
Assembly assembly = Assembly.ReflectionOnlyLoadFrom(@"<assembly Path>");
PortableExecutableKinds kinds;
ImageFileMachine imgFileMachine;
assembly.ManifestModule.GetPEKind(out kinds, out imgFileMachine);
PortableExecutableKinds 可用于检查程序集的种类,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: 文件不符合可移植可执行文件(PE)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/zh-cn/library/system.reflection.imagefilemachine.aspx
使用Assembly.ReflectionOnlyLoadFrom
代替Assembly.LoadFile
。这样可以避免“Bad Image Format”异常。
Assembly.ReflectionOnlyLoadFrom
仍然会导致 System.BadImageFormatException
。 - A N我知道这已经有一段时间没有更新了。通过将文件加载到自己的AppDomain中,我成功地避免了“Bad Image Format”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,我会执行以下操作:
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), "");
}
}