LoadLibrary in WinAppSDK

[hamu777]

I want to search for and find a DLL from the system's environment variables path, but it's not working. The exact same code works fine on the MFC side. Why doesn't it work in WinUI3?
In WinUI 3, is access to environment variables restricted like this?

I'm trying to use LoadLibrary, but it fails with error code 126.
Here is the relevant code snippet:

  size_t sz = 0;
  if (_wgetenv_s(&sz, NULL, 0, L"MY_PATH") == 0 && sz > 0)
  {
      // Allocate buffer to store the value of "MY_PATH"
      std::vector<wchar_t> env_mypath(sz);
      if (_wgetenv_s(&sz, env_mypath.data(), sz, L"MY_PATH") == 0)
      {
          if (_wgetenv_s(&sz, NULL, 0, L"PATH") == 0 && sz > 0)
          {
              std::vector<wchar_t> env_path(sz);
              if (_wgetenv_s(&sz, env_path.data(), sz, L"PATH") == 0)
              {
                std::wstring my_path(env_mypath.data());
                my_path.append(L"\\api\\lib\\x86_64");
                std::wstring path_var(env_path.data());
                path_var.append(L";").append(my_path);
                _wputenv_s(L"PATH", path_var.c_str());
              }
          }
      }
  }    
  auto module_ = ::LoadLibraryA( "mySDK.dll" );
  DWORD ret = GetLastError(); // 126 ERROR_MOD_NOT_FOUND

[whiskhub]

The DLL search order is different for packaged apps: https://learn.microsoft.com/en-us/windows/win32/dlls/dynamic-link-library-search-order#search-order-for-packaged-apps

[hamu777]

Thanks! I now understand that WinUI3 doesn't include the PATH environment variable in its search paths.