Smashing my head on FalconTexturesSharedMemoryArea

bmstest.cpp

#include <iostream>
#include <Windows.h>
#include "SFML/Graphics.hpp"

#include "dds.hpp"

#define FALCON_TEXTURE_SHM "FalconTexturesSharedMemoryArea"


int main(int argc, char** argv) {
  constexpr BOOL  inherited     = FALSE;
  constexpr DWORD access_rights = FILE_MAP_READ;
  constexpr sf::Uint8 offset = sizeof(DirectX::DDS_MAGIC) + sizeof(DirectX::DDS_HEADER);

  void* texture_data = NULL;
  sf::Uint8* texture_buffer = NULL;
  HANDLE textureDataMemHandle = NULL;
  std::size_t texture_size = 1200 * 1200 * 4; // width * height * 4 byte per pixel (RGBA);
  textureDataMemHandle = OpenFileMapping(access_rights,
                                         inherited,
                                         FALCON_TEXTURE_SHM);

  if (textureDataMemHandle == NULL) {
    std::cout << "Unable to open file. Is Falcon Running?" << std::endl;
    return 1;
  }

  texture_data = (void*) MapViewOfFile(textureDataMemHandle,
                                       access_rights,
                                       0, 0, 0);

  sf::Uint8* dds_texture = (sf::Uint8*) texture_data + offset;
  texture_buffer = new sf::Uint8[texture_size];
  for(unsigned int i = 0; i < texture_size; i += 4) {
    // changes from BGRA to RGBA
    texture_buffer[i]     = dds_texture[i + 2]; // R
    texture_buffer[i + 1] = dds_texture[i + 1]; // G
    texture_buffer[i + 2] = dds_texture[i]; // B
    texture_buffer[i + 3] = 0xFF; // dds_texture[i]; // A 0xFF
  }

  sf::Texture tex;
  tex.create(1200, 1200);
  tex.update(texture_buffer);
  bool result = tex.copyToImage().saveToFile("texture.png");
  std::cout << "Save Result: " << result << std::endl;
  std::cout << "offset dim: " << (unsigned int) offset << std::endl;
  delete texture_buffer;
  return 0;
}