GetAllMonitors Parameter - pulBufferSize

 pulBufferSize (PULONG) - output 
    Specifies the size of the pMonitors buffer, in bytes. 

    If the buffer size is too small to contain all monitor definitions, 
    the ERROR_NOT_ENOUGH_MEMORY error is returned. The variable is then 
    given the size of the buffer required in order to contain all monitor 
    definitions.