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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

How to: Determine if an Image is Native or CLR

One way to determine whether an image was built for the common language runtime is to use dumpbin /CLRHEADER.

You can also programmatically check whether an image was built for the common language runtime. For more information, see How to: Detect /clr Compilation.

The following sample determines whether an image was built to run on the common language runtime.

// detect_image_type.cpp
// compile with: /clr
using namespace System;
using namespace System::IO;

enum class CompilationMode {Invalid, Native, CLR };

static CompilationMode IsManaged(String^ filename) {
   try {
      array<Byte>^ data = gcnew array<Byte>(4096);
      FileInfo^ file = gcnew FileInfo(filename);
      Stream^ fin = file->Open(FileMode::Open, FileAccess::Read);
      Int32 iRead = fin->Read(data, 0, 4096);
      fin->Close();

      // Verify this is a executable/dll
      if ((data[1] << 8 | data[0]) != 0x5a4d)
         return CompilationMode::Invalid;

      // This will get the address for the WinNT header
      Int32 iWinNTHdr = data[63]<<24 | data[62]<<16 | data[61] << 8 | data[60];

      // Verify this is an NT address
      if ((data[iWinNTHdr+3] << 24 | data[iWinNTHdr+2] << 16 | data[iWinNTHdr+1] << 8 | data[iWinNTHdr]) != 0x00004550)
         return CompilationMode::Invalid;

      Int32 iLightningAddr = iWinNTHdr + 24 + 208;
      Int32 iSum = 0;
      Int32 iTop = iLightningAddr + 8;

      for (int i = iLightningAddr; i < iTop; ++i)
         iSum |= data[i];

      if (iSum == 0)
         return CompilationMode::Native;
      else
         return CompilationMode::CLR;
   }
   catch(Exception ^e) {
      throw(e);
   }
}

int main() {
   array<String^>^ args = Environment::GetCommandLineArgs();

   if (args->Length < 2) {
      Console::WriteLine("USAGE : detect_clr <assembly_name>\n");
      return -1;
   }

   Console::WriteLine("{0} is compiled {1}", args[1], IsManaged(args[1]));
}

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