typedef struct _ADDMESGINFO
} ADDMESGINFO, *pADDMESGINFO;
The ADDMESGINFO structure contains information about the message being added to or extracted from the bitmap and is used by the L_ExtractMessageFromBitmap and L_AddMessageToBitmap functions.
pADDMESGINFO is a pointer to a ADDMESGINFO structure. Where the function parameter type is pADDMESGINFO, you can declare a ADDMESGINFO variable, update the structure's fields, and pass the variable's address in the parameter. Declaring a pADDMESGINFO variable is necessary only if your program requires a pointer.