Resolved re-initializing an object is causing a crash

I have the following code:

Code:

int main(int argc, char *argv[]) {
	NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
        FILE *ftest;
	int size, i;
	char *string;
	NSString *myNSString = [NSString alloc];
	
	ftest = fopen("/form.txt", "r");
	stat(name, &stbuf);
	myBuffer = calloc(1, size = stbuf.st_size);
	
	string = myBuffer;
	fread(myBuffer, 1, size, ftest);
	for(i=0; i<size; i++){
		if(myBuffer[i]==0x09) {
			myBuffer[i]=0;			
 --->>		        myNSString = [myNSString initWithCString:string encoding:1];
			string = &myBuffer[i+1];
			}
                }
        }

The problem I have is that reinitializing myNSString (at the line with --->>) throws an exception "selector not recognized" at the NSObject level. Is this a problem with myNSString being auto released? Or what else is my problem please?

 

I wrote code in main() to test out some concepts first ... this is just temporary code.

I don't initialize immediately because I initialize later in the code.

The C code is because I need to prepare the data that comes in from the fread() before I do the Obj C operations ... that's more easily done in C. What's shown here is just a snippet of my app.