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How to: Determine if an Image is Native or CLR

 

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The latest version of this topic can be found at 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.

Example

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]));  
}  

See Also

Using C++ Interop (Implicit PInvoke)