c# - C# get the list of unmanaged C dll exports

Question

I have a C dll with exported functions

I can use the command-line tool dumpbin.exe /EXPORTS to extract the list of exported functions, and then use them in my C# code to (successfully) call these functions.

Is there a way to get this exported-functions-list directly from .NET, without having to use an external command-line tool?

Thanks

Answer 1

据我所知，.Net Framework 中没有提供您需要的信息的类。

但是，您可以使用 .Net 平台的平台调用服务 (PInvoke) 来使用 Win32 dbghelp.dll DLL 的功能。此 DLL 是Windows 平台调试工具的一部分。dbghelp DLL 提供了一个名为的函数，该函数SymEnumerateSymbols64允许您枚举动态链接库的所有导出符号。还有一个较新的函数SymEnumSymbols，它还允许枚举导出的符号。

下面的代码显示了一个关于如何使用该SymEnumerateSymbols64 函数的简单示例。

[DllImport("dbghelp.dll", SetLastError = true, CharSet = CharSet.Unicode)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool SymInitialize(IntPtr hProcess, string UserSearchPath, [MarshalAs(UnmanagedType.Bool)]bool fInvadeProcess);

[DllImport("dbghelp.dll", SetLastError = true, CharSet = CharSet.Unicode)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool SymCleanup(IntPtr hProcess);

[DllImport("dbghelp.dll", SetLastError = true, CharSet = CharSet.Unicode)]
public static extern ulong SymLoadModuleEx(IntPtr hProcess, IntPtr hFile,
     string ImageName, string ModuleName, long BaseOfDll, int DllSize, IntPtr Data, int Flags);

[DllImport("dbghelp.dll", SetLastError = true, CharSet = CharSet.Unicode)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool SymEnumerateSymbols64(IntPtr hProcess,
   ulong BaseOfDll, SymEnumerateSymbolsProc64 EnumSymbolsCallback, IntPtr UserContext);

public delegate bool SymEnumerateSymbolsProc64(string SymbolName,
      ulong SymbolAddress, uint SymbolSize, IntPtr UserContext);

public static bool EnumSyms(string name, ulong address, uint size, IntPtr context)
{
  Console.Out.WriteLine(name);
  return true;
}    

static void Main(string[] args)
{
  IntPtr hCurrentProcess = Process.GetCurrentProcess().Handle;

  ulong baseOfDll;
  bool status;

  // Initialize sym.
  // Please read the remarks on MSDN for the hProcess
  // parameter.
  status = SymInitialize(hCurrentProcess, null, false);

  if (status == false)
  {
    Console.Out.WriteLine("Failed to initialize sym.");
    return;
  }

  // Load dll.
  baseOfDll = SymLoadModuleEx(hCurrentProcess,
                              IntPtr.Zero,
                              "c:\\windows\\system32\\user32.dll",
                              null,
                              0,
                              0,
                              IntPtr.Zero,
                              0);

  if (baseOfDll == 0)
  {
    Console.Out.WriteLine("Failed to load module.");
    SymCleanup(hCurrentProcess);
    return;
  }

  // Enumerate symbols. For every symbol the 
  // callback method EnumSyms is called.
  if (SymEnumerateSymbols64(hCurrentProcess,
      BaseOfDll, EnumSyms, IntPtr.Zero) == false)
  {
    Console.Out.WriteLine("Failed to enum symbols.");
  }

  // Cleanup.
  SymCleanup(hCurrentProcess);
}

为了使示例简单，我没有使用该 SymEnumSymbols函数。我也做了这个例子，但没有使用SafeHandle.Net 框架类这样的类。如果您需要该 SymEnumSymbols功能的示例，请告诉我。