The OSC-DLL reference

This DLL allows you to receive OSC data in applications which can bind static librarys (DLLs) on Microsoft Windows.

OSC-DLL download

Download the DLL with sample cpp files.

OSC basics

Each OSC message consists at least of one address string, which tells the application which subfunction is addressed. In the simplest case the address string is the only part of the whole message. Often you will have other parameters following though. The OSC DLL currently supports integer, floating point and string parameters.

OSC function calls:

The OSCDLL exports a number of functions you can call in your program.

Depending on your compiler/programming framework you have to take some steps to be able to access those functions.

For C i prepared a Header-File (oscinterface.h) and a source file (oscinterface.cpp) which allow the import of the functions into your program.

A typical integration into your program would look similar to this:

program initialisation

OSCLinkDLL(); //binds the DLL
OSCOpen(); //opens the OSC connection, will always listen on port 7000

main loop of your program, this example assumes you are receiving tracking data from eyecon. The four parameters are

1. integer timestamp // used as an id to track an individual

2. boolean present // will usually be 1 (true) if this drops to 0 (false) it means that the person with this ID dissapeared

3. float x // x-coordinate scaled to range 0..1

4. float y // y-coordinat scaled to range 0..1


int cnt = OSCMsgCnt(); //number of osc-message in input queue
for (i:=0; i <ccnt;i++) //process all messages which have been received since last loop

char* buffer = OSCAddress(); //OSC address is a string which tells us which subfuntion to use

int n = OSCMsgParaCnt(); //how many messageparameters are available

if (n>=4)


int id = OSCParaAsInt(0);

int alive = OSCParaAsInt(1);

float x = OSCParaAsSingle(2);

float y = OSCParaAsSingle(3);

ProcessPosition(id,alive,x,y); // user function


OSCNext(); //release current message, go to next one


program finalisation

OSCClose(); //closes the OSC connection

List of functions


void OSCOpen(void) Iinitializes the OSC function. Port is always 7000 for now (not very nice...)
void OSCClose(void) Ends the OSC controls function.
int OSCMsgCnt(void) Indicates, how many OSC messages are ready and waiting to be processed
int OSCMsgParaCnt(void) Returns how many parameters the current OSC message is carrying
char* OSCAddress(void) Returns the address string for the current OSC message
int OSCParaAsInt(int n); Interprets a paramter as Integer
float OSCParaAsSingle(int n); returns the OSCparameter with index n, interpreted as datatype single
char* OSCParaAsString(int n); returns the OSCparameter with index n, interpreted as datatype string
void OSCNext(void) Release the current message, make the next one current. Mandatory use after accessing elements of the message