指针问题 待高手

[movie0125]

1. 想将 -1 赋值给一个指针
如：
dynamic_buff_node_t* a = (dynamic_buff_node_t*)-1;
警告：warning: assignment from incompatible pointer type

2. 对void*类型的指针做运算
如：
void* p_elements; i_count = 5;
for (; i_count--; p_elements += 5){……}
警告：warning: pointer of type 'void *' used in arithmetic

3. 结构体中包含结构体，但是初始化有警告
如：
typedef struct a {int a;} A;
typedef struct b {struct ba; int b;} B;
typedef struct c {struct cba; int c;} C;
C test = {0};
警告：warning: missing braces around initializer
warning: (near initialization for 'cba.ba')

高手速速现身！

[c_losed]

如果不影响运行和结果 警告可以无视

[movie0125]

现在就是想去掉警告，这些是我提取出来的模型，软件还是有点大的。不去掉警告怕有影响，特别是指针的警告

[ouyh12345]

2、void *不宜做加法操作，因为不知道加1后指针走多少，转换成具体的类型后，再做加法操作
3、C test;
memset(&test, 0, sizeof(C));

[ouyh12345]

1、
#define INVALID_HANDLE_VALUE ((HANDLE)(LONG_PTR)-1)

[movie0125]

我试试

[movie0125]

我用的linux的环境，定义宏的时候报错了#define INVALID_HANDLE_VALUE ((HANDLE)(LONG_PTR)-1)
external/vgx/libchain/src/buffchain.c:47: error: 'HANDLE' undeclared (first use in this function)
external/vgx/libchain/src/buffchain.c:47: error: (Each undeclared identifier is reported only once
external/vgx/libchain/src/buffchain.c:47: error: for each function it appears in.)
external/vgx/libchain/src/buffchain.c:47: error: 'LONG_PTR' undeclared (first use in this function)