hard time debugging an NSString concatenation

[rjakecastro]

if([self checkIfInsideBoard_X:touchLocation.x checkIfInsideBoard_Y:touchLocation.y] == YES) {
//check if there are any highlighted cell in the board, if no sets it to yes to highlight a cell

//get source
if (isActiveCell == NO) {
isActiveCell = YES;
[self getCellFromCoordsX:touchLocation.x coordsY:touchLocation.y];

//save source to sMove string
moveString = [[[NSString stringWithFormat: @"%d", [self getRow:touchLocation.y]] stringByAppendingString:[NSString stringWithFormat: @"%d", [self getColumn:touchLocation.x]]] stringByAppendingString: sBoard[ [self getRow:touchLocation.y] ] [ [self getColumn:touchLocation.x] ] ];
NSLog(@"move string : %@", moveString);

// NSLog(@"filename: %@", [self getPieceFileName:@"A"]);
}

//get destination
else {
isActiveCell = NO;

moveString2 = [NSString stringWithFormat:@"%@_%@", moveString, @"i'm concatenating this string to moveString"];
}



}


i have this code above, and keep getting an error like this: Program received signal: “EXC_BAD_ACCESS”.
warning: Couldn't find minimal bounds for "_sigtramp" - backtraces may be unreliable

i get this error on this line of code: moveString2 = [NSString stringWithFormat:@"%@_%@", moveString, @"i'm concatenating this string to moveString"];
}

it's a simple concatenation of string but i really don't understand why i'm getting this error. can somebody please help me.. thnx in advance.. any help will be appreciated.

[smasher]

You'll get an error if either of the strings you're concatenating get autoreleased before you use them. I'd NSLog moveString and the other string (if it's not really a constant) right before you use them in that line.

I can see that if isActiveCell==YES then moveString won't get assigned a value by this code. If the string it points to isn't valid any more. it'll crash.

[rarindeed]

Just a tip, you can have more than one field in a format string. e.g., @"Your name is: %@\nYou are %i year old %@."

[rjakecastro]

ahh.. thanks guys..
i've solved the problem.. well, at least one of my problems.. thanks for your help..