private void UnloadFrEngineDllIfLoaded()
{
if (_frEngineDllHandle == IntPtr.Zero)
{
return;
}
_deinitializeEngine();
FrEngineUtils.FreeLibrary(_frEngineDllHandle);
_frEngineDllHandle = IntPtr.Zero;
}
private object LoadFrEngineNatively(string frEngineDllPath)
{
FrEngineUtils.CheckFrEngineDllPath(frEngineDllPath);
// Load FREngine.dll library.
_frEngineDllHandle = FrEngineUtils.LoadLibraryEx(frEngineDllPath, IntPtr.Zero,
FrEngineUtils.LoadWithAlteredSearchPath);
if (_frEngineDllHandle == IntPtr.Zero)
{
throw new ApplicationException(string.Format(Resources.EXC_FRE_DLL_CANNOT_LOAD, frEngineDllPath));
}
// Prepare FineReader Engine unloading function delegate.
var deinitializeEngineHandle = FrEngineUtils.GetProcAddress(_frEngineDllHandle,
FrEngineUtils.FrEngineUnloadingFunctionName);
if (deinitializeEngineHandle == IntPtr.Zero)
{
throw new ApplicationException(string.Format(Resources.EXC_FRE_DLL_FUNC_SEARCH,
FrEngineUtils.FrEngineUnloadingFunctionName, frEngineDllPath));
}
_deinitializeEngine =
(Action)Marshal.GetDelegateForFunctionPointer(deinitializeEngineHandle, typeof(Action));
// Prepare FineReader Engine loading function delegate and try to get Engine object.
object engine = null;
var getEngineObjectHandle = FrEngineUtils.GetProcAddress(_frEngineDllHandle,
FrEngineUtils.FrEngineLoadingFunctionName);
if (getEngineObjectHandle == IntPtr.Zero)
{
throw new ApplicationException(string.Format(Resources.EXC_FRE_DLL_FUNC_SEARCH,
FrEngineUtils.FrEngineLoadingFunctionName, frEngineDllPath));
}
var getEngineObjectEx = (GetEngineObjectEx)Marshal.GetDelegateForFunctionPointer(getEngineObjectHandle,
typeof(GetEngineObjectEx));
Marshal.ThrowExceptionForHR(getEngineObjectEx(_projectId, null, null, true, null, _password, ref engine));
return(engine);
}