Adding new parameters in new plugin versions - Example

[Youlean]

Here is simple code change that will allow you to add new parameters in the future versions of the plugin without braking the plugin. You can also remove parameters. NOTE: If you want to add new parameter you need to put it to the end of enum.
Also this is not well tested, so test it before use.

IPlugBase.cpp

bool IPlugBase::SerializeParams(ByteChunk* pChunk)
{
  TRACE;

  WDL_MutexLock lock(&mMutex);
  bool savedOK = true;
  int i, n = mParams.GetSize();

  // Save number of parameters. Do this so you can add parameters in the future versions without braking the plugin. 
  // NOTE: Add new parameters at the end.
  pChunk->Put(&n);

  for (i = 0; i < n && savedOK; ++i)
  {
    IParam* pParam = mParams.Get(i);
    Trace(TRACELOC, "%d %s %f", i, pParam->GetNameForHost(), pParam->Value());
    double v = pParam->Value();
    savedOK &= (pChunk->Put(&v) > 0);
  }

  return savedOK;
}

int IPlugBase::UnserializeParams(ByteChunk* pChunk, int startPos)
{
  TRACE;

  WDL_MutexLock lock(&mMutex);
  int i, n = mParams.GetSize(), pos = startPos;

  // Use last saved parameter number.
  pos = pChunk->Get(&n, pos);
  n = IPMIN(n, mParams.GetSize());

  for (int i = 0; i < n && pos >= 0; ++i)
  {
    IParam* pParam = mParams.Get(i);
    double v = 0.0;
    Trace(TRACELOC, "%d %s %f", i, pParam->GetNameForHost(), pParam->Value());
    pos = pChunk->Get(&v, pos);
    pParam->Set(v);
  }

  OnParamReset();
  return pos;
}