如何获取NSTextField的stringValue的字符串长度？

Question

This is probably a naive question but, how do I get the length of the stringValue of an NSTextField ? I tried

int len = strlen((char *)[textField stringValue]);

where textField is an NSTextField but it always returns 6 (size of a pointer?). Besides I am sure that there is a more Objective-C way to do what I am after.

Answer 1

See NSString documentation

NSUInteger length = [[textField stringValue] length];

The crucial thing to realize here is that an NSString is not a char*. To get a real C-style char*, you need to do something like:

const char* ptr = [[textField stringValue]
    cStringUsingEncoding:[NSString defaultCStringEncoding]];

Updated to use default encoding instead of assuming ASCII.

Answer 2

stringValue is NSString instance. You may use the next code:

NSUInteger len = [[textField stringValue] length];