這是可接受的練習初始化堆上的數組？

Question

這是可以接受的代碼？：

unsigned char *buffer= malloc(16 * sizeof(*buffer)); 
     if (buffer == NULL) { 
      errorText.text= @"Insufficient memory."; 
      NSLog(@"%@",@"Insufficient memory."); 
      return; 
     } 
     unsigned char temp[16]= {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}; 
     memcpy(buffer,temp,16); 
     NSData* seed= [NSData dataWithBytesNoCopy:buffer length:16]; 

或：

unsigned char *buffer= malloc(16 * sizeof(*buffer)); 
if (buffer == NULL) { 
    errorText.text= @"Insufficient memory."; 
    NSLog(@"%@",@"Insufficient memory."); 
    return; 
} 
memset(buffer,0,16); // set all bytes to zero 
buffer[0]= 0x01; 
buffer[1]= 0x02; 
buffer[2]= 0x03; 
buffer[3]= 0x04; 
buffer[4]= 0x05; 
buffer[5]= 0x06; 
buffer[6]= 0x07; 
buffer[7]= 0x08; 
buffer[8]= 0x09; 
buffer[9]= 0x0a; 
buffer[10]= 0x0b; 
buffer[11]= 0x0c; 
buffer[12]= 0x0d; 
buffer[13]= 0x0e; 
buffer[14]= 0x0f; 
buffer[15]= 0x10; 
NSData* seed= [NSData dataWithBytesNoCopy:buffer length:16]; 

我的C是有點生疏！

Answer 1

[編輯刪除有關未使用malloc與dataWithBytesNoCopy虛假諮詢]

另一種選擇是隻使用-dataWithBytes:讓NSData的照顧複製給你：

static unsigned char seedBytes[16]= {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}; 
    NSData* seed= [NSData dataWithBytes:seedBytes length:16];