错误：表达式必须是指向完整对象类型的指针（？）
这是我需要修改的C 函数。我试图将以前的 4 个字节的地址从“box”开始与 rt_tsk_self() 返回的 U32 值进行比较，但它只是给了我一个错误：“表达式必须是指向完整的对象类型”。
/*--------------------------- rt_free_box -----------------------------------*/
int rt_free_box (void *box_mem, void *box) {
/* Free a memory block, returns 0 if OK, 1 if box does not belong to box_mem */
if !(defined(__TARGET_ARCH_7_M) || defined(__TARGET_ARCH_7E_M))
int irq_dis;
endif
if (box < box_mem || box > ((P_BM) box_mem)->end) {
return (1);
}
//MODIFIED***********
if (*(box-4) != rt_tsk_self()) { //<--- error: #852: expression must be a pointer to a complete object type
return (1);
}
//***************
/*
other unrelated code
*/
return (0);
}
This is the function in C that I need to modify. I am trying to have PREVIOUS 4 bytes of address starting from "box" to compare with a returned U32 value from rt_tsk_self(), but it just gives me the error that "expression must be a pointer to a complete object type".
/*--------------------------- rt_free_box -----------------------------------*/
int rt_free_box (void *box_mem, void *box) {
/* Free a memory block, returns 0 if OK, 1 if box does not belong to box_mem */
if !(defined(__TARGET_ARCH_7_M) || defined(__TARGET_ARCH_7E_M))
int irq_dis;
endif
if (box < box_mem || box > ((P_BM) box_mem)->end) {
return (1);
}
//MODIFIED***********
if (*(box-4) != rt_tsk_self()) { //<--- error: #852: expression must be a pointer to a complete object type
return (1);
}
//***************
/*
other unrelated code
*/
return (0);
}
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您正在尝试取消引用
void *。那是行不通的。试试这个：You're trying to dereference a
void *. That won't work. Try this instead: