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Messages

Messages are defined as simple structures containing fields indicating the source, target, and content of the message:

struct PegMessage
{ 
    PegMessage(void); 
    PegMessage(PEGUINT wVal); 
    PegMessage(PegThing * pTo, PEGUINT wVal); 
    PEGUINT      wType; 
    PEGINT       iData; 
    PegThing   * pTarget; 
    PegThing   * pSource; 
    PegMessage * Next; 
    union 
    { 
        void   * pData; 
        LONG     lData; 
        PegRect  Rect; 
        PegPoint Point; 
        LONG     lUserData[2]; 
        DWORD    dUserData[2]; 
        PEGINT   iUserData[4]; 
        PEGUINT  wUserData[4]; 
        UCHAR    uUserData[8]; 
    }; 
};

Messages are identified by the member field wType. Currently RTPEG-32 reserves the first 8000h message wType values for internal messages, which leaves message values 8000h through FFFFh available for user definition. Peg.hpp provides a #define indicating the first message value which is available for user definition. This #define is called FIRST_USER_MESSAGE.

An overview of the RTPEG-32 system messages is included in the RTPEG-32 Reference Manual.

Class PegMessageQueue

Message Flow and Routing