检查非托管DLL是32位还是64位？ [英] Check if unmanaged DLL is 32-bit or 64-bit?

问题描述

解决方案

如果一个非托管 DLL文件是x86或x64，我如何以编程方式告诉C＃ p>请参阅规格。这是一个基本的实现：

  public static MachineType GetDllMachineType（string dllPath）
 {
 //见http ：//www.microsoft.com/whdc/system/platform/firmware/PECOFF.mspx 
 // PE头的偏移始终为0x3C。 
 // PE头以PE\0\0= 0x50 0x45 0x00 0x00，
 //后面跟着一个2字节的机器类型字段（参见上面的枚举文件） 。 
 // 
 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 not find PE header）; 
 
 MachineType machineType =（MachineType）br.ReadUInt16（）; 
 br.Close（）; 
 fs.Close（）; 
 return machineType; 
} 
  

MachineType 枚举被定义为：

  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_MACH INE_WCEMIPSV2 = 0x169，
} 
  

我只需要三个，为了完整性。最终64位检查：

  //如果dll为64位，则返回true，如果为32位则返回false如果未知
 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; 
默认值：
返回null; 
} 
} 
  

How can I programmatically tell in C# if an unmanaged DLL file is x86 or x64?

解决方案

Refer to the specifications. Here's a basic implementation:

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;
}

The MachineType enum is defined as:

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,
}

I only needed three of these, but I included them all for completeness. Final 64-bit check:

// 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;
    }
}

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