C++ SetEnvelopeStateChunk

[leighhunt]

Greetings all,

I'm trying to successfully write to the EnvelopeStateChunk... but not succeeding.
So far I have,

char chunk[20000]; // silly large amount. Have tried smaller ie 2000 just in case the problem is here
int help = 20000;
GetEnvelopeStateChunk(GetTrackEnvelopeByChunkName( x->TrkVec[0].MTrk, "<VOLENV2"), chunk, help, true); //TrackEnvelope is valid. have checked by reading returned chunk.
std::string msg1(chunk);
std::cout << "pre edit - " << msg1 << std::endl;
size_t f = msg1.find("ARM");
msg1.replace(f, 5, "ARM 1");
std::cout << "post edit - " << msg1 << std::endl;
// The above appears to correctly change the text in msg1

bool test = SetEnvelopeStateChunk(tootle, msg1.c_str(), true);
// returns false and chunk is not updated. I have also tried 'false' for bool isundoOptional

Am I missing a simple step here?
Any help graciously and thankfully received.
Kind regards,
Leigh Hunt

[nofish]

Hi,

hm..your code (with slight modifications to make it executeable) seems to work here on a quick test. I can use it to set volume env. not armed > armed (which I guess is the goal of this code?)

The code I used:

char chunk[20000]; // silly large amount. Have tried smaller ie 2000 just in case the problem is here
int help = 20000;
MediaTrack* tr1 = CSurf_TrackFromID(1, false);
TrackEnvelope* volEnv = GetTrackEnvelopeByChunkName(tr1, "<VOLENV2");
GetEnvelopeStateChunk(volEnv, chunk, help, true); //TrackEnvelope is valid. have checked by reading returned chunk.
std::string msg1(chunk);
std::cout << "pre edit - " << msg1 << std::endl;
size_t f = msg1.find("ARM");
msg1.replace(f, 5, "ARM 1");
std::cout << "post edit - " << msg1 << std::endl;
// The above appears to correctly change the text in msg1

bool test = SetEnvelopeStateChunk(volEnv, msg1.c_str(), true);
// returns false and chunk is not updated. I have also tried 'false' for bool isundoOptional

(sidenote: you may consider putting your posted code between code tags for a bit easier reading (and keeping formatting intact.)

Debugging screenshot (note the test == true at the bottom)



Does this help in any way?
Btw. I wonder what is 'tootle' in your last line?

edit:
sidenote2:
You can also do

GetEnvelopeStateChunk(volEnv, chunk, sizeof(chunk), true);

and skip the help variable for a slight code improvement.

[leighhunt]

Thanks for the reply.
I'm wondering whether the positioning of this code could be the issue here, as it stubbornly refuses to set the chunk.
fyi - I'm using this code in a vst2 plugin, in an OSC receive thread. I do a lot of other api stuff in there too which runs absolutely fine.
Thanks for the size of(chunk) heads up.. I know this, and completely forgot!

[leighhunt]

oh, and 'tootle' was a residual temporary name I used, randomly typed !

[nofish]

Originally Posted by leighhunt

Thanks for the reply.
I'm wondering whether the positioning of this code could be the issue here, as it stubbornly refuses to set the chunk.
fyi - I'm using this code in a vst2 plugin, in an OSC receive thread. I do a lot of other api stuff in there too which runs absolutely fine.
Thanks for the size of(chunk) heads up.. I know this, and completely forgot!

That's not my field of experience, sorry, but I remember this statement from Justin saying

most REAPER APIs are designed only to be used from the main (GUI) thread, not from audio threads or from plug-in-created threads.

https://www.askjf.com/index.php?q=3889

[leighhunt]

Originally Posted by nofish

That's not my field of experience, sorry, but I remember this statement from Justin saying


https://www.askjf.com/index.php?q=3889

Yes, I am aware of the potential for the code messing up big time as a result of not keeping to using the api where it is advised to be used.
I have done a lot of testing and it's a personal project.
I did find that triggering any actions using ON_COMMAND in my code caused problems (so I pipe OSC through to actions in Reaper).
This indeed might be a second anomaly that could prove to be something of a hurdle.
I'm reluctant to move this project over to a Reascript and/or control surface project as my knowledge in that area is pretty basic.
I've currently implemented quite a lot of the project;
OSC streams to and from 5 sources including 2 touchscreens (using good old Maxmsp to build the GUI) .
Midi to and from 5 devices.
A complete data structure for quite a lot of data.
JSON for easily readable data storage.

I have no idea what is possible in Reascript regarding the above (and possibly quite some more bits and bobs I've implemented), so I will soldier on for now and see if I can find a solution for this.

Thanks muchly for your help and suggestions.
Kind regards,
Leigh