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ByteArrObj (3)
  • >> ByteArrObj (3) ( Solaris man: Библиотечные вызовы )
  • 
    _________________________________________________________________
    
    NAME
         Tcl_NewByteArrayObj,                    Tcl_SetByteArrayObj,
         Tcl_GetByteArrayFromObj, Tcl_SetByteArrayLength - manipulate
         Tcl objects as a arrays of bytes
    
    SYNOPSIS
         #include <tcl.h>
    
         Tcl_Obj *
         Tcl_NewByteArrayObj(bytes, length)
    
         void
         Tcl_SetByteArrayObj(objPtr, bytes, length)
    
         unsigned char *
         Tcl_GetByteArrayFromObj(objPtr, lengthPtr)
    
         unsigned char *
         Tcl_SetByteArrayLength(objPtr, length)
    
    ARGUMENTS
         unsigned char   *bytes       (in)      The  array  of  bytes
                                                used to initialize or
                                                set   a    byte-array
                                                object.
    
         int             length       (in)      The  length  of   the
                                                array  of  bytes.  It
                                                must be >= 0.
    
         Tcl_Obj         *objPtr      (in/out)  For
                                                Tcl_SetByteArrayObj,
                                                this  points  to  the
                                                object   to  be  con-
                                                verted to  byte-array
                                                type.             For
                                                Tcl_GetByteArrayFromObj
                                                and
                                                Tcl_SetByteArrayLength,
                                                this  points  to  the
                                                object from which  to
                                                get   the  byte-array
                                                value; if objPtr does
                                                not  already point to
                                                a byte-array  object,
                                                it  will be converted
                                                to one.
    
         int             *lengthPtr   (out)     If  non-NULL,  filled
                                                with  the  length  of
                                                the array of bytes in
                                                the object.
    _________________________________________________________________
    
    
    DESCRIPTION
         These procedures are used to create, modify,  and  read  Tcl
         byte-array objects from C code.  Byte-array objects are typ-
         ically used to hold the results of binary IO  operations  or
         data structures created with the binary command.  In Tcl, an
         array of bytes is not equivalent to a string.  Conceptually,
         a  string  is  an array of Unicode characters, while a byte-
         array is an array of 8-bit quantities with no implicit mean-
         ing.   Accesser  functions  are  provided  to get the string
         representation of a byte-array or to  convert  an  arbitrary
         object to a byte-array.  Obtaining the string representation
         of a byte-array  object  (by  calling  Tcl_GetStringFromObj)
         produces  a properly formed UTF-8 sequence with a one-to-one
         mapping between the bytes in the internal representation and
         the UTF-8 characters in the string representation.
    
         Tcl_NewByteArrayObj and Tcl_SetByteArrayObj  will  create  a
         new  object  of byte-array type or modify an existing object
         to have a byte-array type.  Both of these procedures set the
         object's type to be byte-array and set the object's internal
         representation to a copy of the  array  of  bytes  given  by
         bytes.  Tcl_NewByteArrayObj  returns  a  pointer  to a newly
         allocated  object  with   a   reference   count   of   zero.
         Tcl_SetByteArrayObj  invalidates  any old string representa-
         tion and, if the object is not already a byte-array  object,
         frees any old internal representation.
    
         Tcl_GetByteArrayFromObj converts a Tcl object to  byte-array
         type  and  returns  a  pointer  to the object's new internal
         representation as an array of bytes.   The  length  of  this
         array  is stored in lengthPtr if lengthPtr is non-NULL.  The
         storage for the array of bytes is owned by  the  object  and
         should not be freed.  The contents of the array may be modi-
         fied by the caller only if the object is not shared and  the
         caller invalidates the string representation.
    
         Tcl_SetByteArrayLength converts the Tcl object to byte-array
         type  and  changes  the  length  of  the  object's  internal
         representation as an array of bytes.  If length  is  greater
         than  the space currently allocated for the array, the array
         is reallocated to the new length; the newly allocated  bytes
         at the end of the array have arbitrary values.  If length is
         less than the space currently allocated for the  array,  the
         length  of  array  is reduced to the new length.  The return
         value is a pointer to the object's new array of bytes.
    
    
    SEE ALSO
         Tcl_GetStringFromObj,     Tcl_NewObj,      Tcl_IncrRefCount,
         Tcl_DecrRefCount
    
    
    KEYWORDS
         object, byte array, utf, unicode, internationalization
    
    
    
    


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