str_ex.c

Code Interface Node (CIN) That Converts a LabVIEW String to a C String, Modifies it, and Returns it

/*
 * CIN source file 
 */

#include "extcode.h"

/* stubs for advanced CIN functions */

UseDefaultCINInit
UseDefaultCINDispose
UseDefaultCINAbort
UseDefaultCINLoad
UseDefaultCINUnload
UseDefaultCINSave

CIN MgErr CINRun(LStrHandle origLVstr, LStrHandle modLVstr);

CIN MgErr CINRun(LStrHandle origLVstr, LStrHandle modLVstr) {
	
/* An overview of the LV Manager functions and macros can be found   */
/* in the "Memory Manager" chapter of the Code Interface Reference   */
/* Manual.  Documentation on specific LV Manager functions or macros */
/* can be found by going to "Help>>Online Reference" in LV and       */
/* performing a search on the specific function name, or class of    */
/* function:  [Memory, Support, or File] Manager.                    */

	#define CSTRINGLEN 10 /* arbitrary length for string */

	int32 len;
	char cstring[CSTRINGLEN]="";
	MgErr err=bogusError; /* bogusError is miscellaneous     */
	                      /* error code defined in extcode.h */

	/* write original LV string to c string only if */
	/* CSTRINGLEN is large enough                   */
	if (CSTRINGLEN >= LStrLen(*origLVstr))
		SPrintf(cstring, "%H", origLVstr);
	else
		goto out;

	/* normal c string manipulation would go here */
	cstring[0]='!';

	len=StrLen(cstring);

	/* resize modified LV string to accomodate c string */
	if (err = NumericArrayResize(uB, 1L,(UHandle *)&modLVstr, len))
		goto out;

	/* update the length of the modified LV string */
	LStrLen(*modLVstr)=len;

	/* move len bytes from cstring to modified LV string */
	MoveBlock(&cstring, LStrBuf(*modLVstr), len);

	return noErr;

out:
	return err;
	}