Can you send the backtrace of the crash ("bt" in LLDB)?
> Am 16.07.2023 um 15:23 schrieb loserist <loser...@88.com>:
>
> Hi all! I seem to have found the problem.the problem is that the user-defined
> class is not working properly, see the following code and its output message
> please.Does anyone know how to fix this?
> #import <Foundation/Foundation.h>
> @interface SayHello : NSObject
> - (void)greet;
> @end
> @implementation SayHello
> - (void)greet {
> NSLog(@"Hello GnuStep");
> }
> @end
> int main(int argc, char *argv[]) {
> NSLog(@"arrayCls = %@", objc_getClass("NSArray")); // Yes
> NSLog(@"stringCls = %@", objc_getClass("NSString")); // Yes
>
> //! NSLog(@"userCls = %@", [SayHello class]); -- crash here!
> NSLog(@"userCls = %@", objc_getClass("SayHello")); // null
>
> NSArray *nameList = [NSArray arrayWithObjects:
> @"Scott", @"Jesse", @"Gaia",
> nil
> ];
> NSLog(@"nameList = %@", nameList); // good
> NSArray *nameList2 = [[NSArray alloc] init];
> NSLog(@"nameList2 = %@", nameList2); // Ok
>
> SayHello *userObj = [[SayHello alloc] init]; // crash here!
> NSLog(@"userObj = %@", userObj);
> return 0;
> }
> 2023-07-16 21:02:02.665 abc[2996:4992] arrayCls = NSArray
> 2023-07-16 21:02:02.665 abc[2996:4992] stringCls = NSString
> 2023-07-16 21:02:02.665 abc[2996:4992] userCls = (null)
> 2023-07-16 21:02:02.665 abc[2996:4992] nameList = (Scott, Jesse, Gaia)
> 2023-07-16 21:02:02.665 abc[2996:4992] nameList2 = ()
> Process 2380 stopped
> * thread #1, stop reason = Exception 0xc0000005 encountered at address
> 0x7ffb73b91048: Access violation reading locatio
> n 0x00000000
> frame #0: 0x00007ffb73b91048 objc.dll`objc_msgSend + 40
> objc.dll`objc_msgSend:
> -> 0x7ffb73b91048 <+40>: movl (%r10), %r11d
> 0x7ffb73b9104b <+43>: cmpl $0x8, %r11d
> 0x7ffb73b9104f <+47>: je 0x7ffb73b91063 ; <+67>
> 0x7ffb73b91051 <+49>: cmpl $0x0, %r11d
>
>
> Thank you!
>
