Hey there,

I have a C++ dll which is calling my C# code after an injection:


Code:
#include "stdafx.h"
#include <metahost.h>
#pragma comment(lib, "mscoree.lib")

DWORD WINAPI ControlThread(LPVOID lpParam)
{
	ICLRMetaHost* metaHost = NULL;
	ICLRRuntimeInfo* runtimeInfo = NULL;
	ICLRRuntimeHost* runtimeHost = NULL;
	if (CLRCreateInstance(CLSID_CLRMetaHost, IID_ICLRMetaHost, (LPVOID*)&metaHost) == S_OK)
	if (metaHost->GetRuntime(L"v4.0.30319", IID_ICLRRuntimeInfo, (LPVOID*)&runtimeInfo) == S_OK)
	if (runtimeInfo->GetInterface(CLSID_CLRRuntimeHost, IID_ICLRRuntimeHost, (LPVOID*)&runtimeHost) == S_OK)
	if (runtimeHost->Start() == S_OK)
	{
		DWORD pReturnValue;
		runtimeHost->ExecuteInDefaultAppDomain(L"C:\\Dev\\CalledDll.dll", L"CalledDll.InjectedCSharpCode", L"DllMain", L"C# DLL loaded.", &pReturnValue);

		runtimeInfo->Release();
		metaHost->Release();
		runtimeHost->Release();
	}
	return 0;
}

BOOL APIENTRY DllMain(HMODULE hModule,
	DWORD  ul_reason_for_call,
	LPVOID lpReserved
)
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
		CreateThread(NULL, NULL, (LPTHREAD_START_ROUTINE)ControlThread, hModule, NULL, NULL);
		break;
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
	return TRUE;
}
This is my C# DLL:

Code:
using System.Windows.Forms;

namespace CalledDll
{
    public class InjectedCSharpCode
    {
        public static int DllMain(string InjectStatus)
        {
            MessageBox.Show("Im successfully called from C++ DLL.");

            Main();

            return 0;
        }

        public static void Main()
        {
            var form = new TestForm();
            form.Show();
        }            
        
    }
}
So the problem is that this don't work on all programs. On notepad++ it works fine.
But in a few programs and games, it don't work. In GTA 5 it works fine, but in games like Outlast or Dishonored, it don't work.
Can someone tell my why?

I think the injected C++ dll can't start the runtimehost. But why?