Manual Reference Pages - TCL_GETBYTEARRAYFROMOBJ (3)
Tcl_NewByteArrayObj, Tcl_SetByteArrayObj, Tcl_GetByteArrayFromObj, Tcl_SetByteArrayLength - manipulate Tcl objects as a arrays of bytes
Tcl_SetByteArrayObj(objPtr, bytes, length)
unsigned char *
unsigned char *
const unsigned char *bytes (in)
const unsigned char*bytes
const unsigned char
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 converted 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.
These procedures are used to create, modify, and read Tcl byte-array objects
from C code. Byte-array objects are typically 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 meaning.
Accessor 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 objects type to be
byte-array and set the objects 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 representation and, if
the object is not already a byte-array object, frees any old internal
Tcl_GetByteArrayFromObj converts a Tcl object to byte-array type and
returns a pointer to the objects 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
modified 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 objects 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 objects new array of bytes.
Tcl_GetStringFromObj, Tcl_NewObj, Tcl_IncrRefCount, Tcl_DecrRefCount
object, byte array, utf, unicode, internationalization
|Tcl ||TCL_BYTEARRAYOBJ (3) ||8.1 |
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