Getting the offsets of the IUnknown virtual functions for ID3D11Device.

d3d11device_vtableptrs.cpp

#include <iostream>
#include <d3d11.h>

#pragma comment(lib, "d3d11.lib")

int main()
{
	D3D_FEATURE_LEVEL featureLevels[] = { D3D_FEATURE_LEVEL_11_0 };
	ID3D11Device* device = nullptr;
	ID3D11DeviceContext* context = nullptr;

	HRESULT hr = D3D11CreateDevice(
		nullptr,
		D3D_DRIVER_TYPE_HARDWARE,
		nullptr,
		0,
		featureLevels,
		sizeof(featureLevels) / sizeof(D3D_FEATURE_LEVEL),
		D3D11_SDK_VERSION,
		&device,
		nullptr,
		&context);

	if (SUCCEEDED(hr))
	{
		if (device)
		{
			INT_PTR d3d11ModuleOffset = (INT_PTR)::GetModuleHandleA("d3d11.dll");

			// Get the virtual table pointer for ID3D11Device instances
			INT_PTR* vtable = *(INT_PTR**)device;

			// Print out the relative offsets for QueryInterface/AddRef/Release
			for (int i = 0; i < 3; ++i)
			{
				std::cout.width(sizeof(INT_PTR) * 2);
				std::cout.fill('0');
				std::cout << std::hex << vtable[i] - d3d11ModuleOffset << std::endl;
			}

			device->Release();
		}

		if (context)
		{
			context->Release();
		}
	}
}