MACROMEDIA DREAMWEAVER MX 2004-EXTENDING DREAMWEAVER Spezifikationen PDF herunterladen (Seite 458)

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458 C-Level Extensibility

The readContentsOfFile() function accepts a list of arguments from the user, retrieves the

filename argument, reads the contents of the file, and returns the contents of the file. For

more information about the JavaScript data structures and functions that appear in the

readContentsOfFile() function, see “C-level extensibility and the JavaScript interpreter”

on page 459.

JSBool

readContentsOfFile(JSContext *cx, JSObject *obj, unsigned int ¬

argc, jsval *argv, jsval *rval)

{

char *fileName, *fileContents;

JSBool success;

unsigned int length;

/* Make sure caller passed in exactly one argument. If not,

* then tell the interpreter to abort script execution. */

if (argc != 1){

JS_ReportError(cx, "Wrong number of arguments", 0);

return JS_FALSE;

}

/* Convert the argument to a string */

fileName = JS_ValueToString(cx, argv[0], &length);

if (fileName == NULL){

JS_ReportError(cx, "The argument must be a string", 0);

return JS_FALSE;

}

/* Use the string (the file name) to open and read a file */

fileContents = exerciseLeftToTheReader(fileName);

/* Store file contents in rval, which is the return value ¬

passed

* back to the caller */

success = JS_StringToValue(cx, fileContents, 0, *rval);

free(fileContents);

/* Return true to continue or false to abort the script */

return success;

}

To ensure that the readContentsOfFile() function executes properly and doesn’t cause a

JavaScript error, you must register the function with the JavaScript interpreter by including a

MM_Init() function in your library. When Dreamweaver loads the library at startup, it calls

the

MM_Init() function to get the following three pieces of information:

■ The JavaScript name of the function

■ A pointer to the function

■ The number of arguments that the function expects

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