См. характеристики . Вот базовая реализация:
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).
//
FileStream fs = new FileStream(dllPath, FileMode.Open, FileAccess.Read);
BinaryReader 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");
MachineType machineType = (MachineType) br.ReadUInt16();
br.Close();
fs.Close();
return machineType;
}
Перечисление MachineType
определяется как:
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,
}
Мне нужно было только три из них, но я включил их все для полноты. Финальная 64-битная проверка:
// 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;
}
}