MAX/MSP SDK学习06：内存管理

提供两种内存分配方式：①简单指针，②句柄（二级指针）；官方文档建议使用前者。

// 简单指针
char *ptr;
ptr = sysmem_newptr(2000);
post("I have a pointer %lx and it is %ld bytes in size",ptr, sysmem_ptrsize(ptr));
ptr = sysmem_resizeptrclear(ptr, 3000);
post("Now I have a pointer %lx and it is %ld bytes in size",ptr, sysmem_ptrsize(ptr));
sysmem_freeptr(ptr);

// 句柄
char **hand;
hand = sysmem_newhandle(2000);
post("I have a handle %lx and it is %ld bytes in size",hand, sysmem_handlesize(hand));
sysmem_resizehandle(hand, 3000);
post("Now the handle %lx is %ld bytes in size",hand, sysmem_ptrsize(hand));
sysmem_freehandle(hand);

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简单使用示例：

typedef struct _memAlloc {
	t_object	ob;
	char* ptr;  // 定义指针
} t_memAlloc;

/* ..... */

void memAlloc_free(t_memAlloc* x) {
	sysmem_freeptr(x->ptr);  // 释放内存
}

void* memAlloc_new(t_symbol* s, long argc, t_atom* argv) {  
	t_memAlloc* x = (t_memAlloc*)object_alloc(memAlloc_class);

	x->ptr = sysmem_newptr(1024);  // 分配内存
	post("%lx: %ld bytes", x->ptr, sysmem_ptrsize(x->ptr));  // 打印内存地址和内存大小

	return (x);
}

运行结果：