MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Instrukcja Obsługi Pobierz pdf (Strona 47)

Compiler Directives

2-27

Output File Control

The structure of the output file control construct is:

%openfile string optional-equal-string optional-mode

%closefile id

%selectfile id

The %openfile directive opens a file or buffer for writing; the required string

variable becomes a variable of type

file. For example:

%openfile x /% Opens and selects x for writing. %/

%openfile out = "out.h" /% Opens "out.h" for writing. %/

The %selectfile directive selects the file specified by the variable as the

current output stream. All output goes to that file until another file is selected

using

%selectfile. For example:

%selectfile x /% Select file x for output. %/

The %closefile directive closes the specified file or buffer, and if this file is the

currently selected stream,

%closefile invokes %selectfile to reselect the last

previously selected output stream.

There are two possible cases that

%closefile must handle:

•If the stream is a file, the associated variable is removed as if by

%undef.

• If the stream is a buffer, the associated variable receives all the text that has

been output to the stream. For example:

%assign x = "" /% Creates an empty string. %/

%openfile x

"hello, world"

%closefile x /% x = "hello, world\n"%/

If desired, you can append to an output file or string by using the optional

mode,

a, as in:

%openfile "foo.c", "a" %% Opens foo.c for appending.

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 281 282

Brak uwag

MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Instrukcja Obsługi Strona 47