objective-c - 如何创建一个c数组？

Question

如何在构造函数中设置指向 C 数组的指针？

@implementation NSBufferedInputStream {
    char *buffer;
    int bufferSize;
}

- (id)initWithFileAtPath:(NSString *)path
{
    self = [super initWithFileAtPath:path];
    if (self) {
        bufferSize = 100;
        buffer = char[bufferSize]; // ERROR: Expected expression
    }
}
@end

Answer 1

如果你真的需要一个动态大小的数组，

- (id)initWithFileAtPath:(NSString *)path
{
    self = [super initWithFileAtPath:path];
    if (self) {
        bufferSize = 100;
        buffer = malloc(sizeof(char) * bufferSize);
    }
}

- (void)dealloc
{
    free(buffer);
    [super dealloc];
}

否则，如果您的数组大小在编译时已知，只需将您的 ivar 从 char *buffer; 更改为:

char buffer[100]