如何初始化Iaccessible接口accLoacation()方法中的参数？

Question

我尝试使用Iaccessible接口的accLocation()方法检索一个元素的屏幕位置，但在初始化该方法的参数时遇到了问题

IAccessible *plocation;
long *x;
long *y;
long *width;
long *height;

VARIANT varChild;
varChild.vt = VT_I4;
varChild.iVal = CHILDID_SELF;

hr = pIaccessible->GetIAccessible(&plocation);
hr = plocation->accLocation(x, y, width, height, varChild);

但当我运行它时，错误消息如下：

    uninitialized local variable 'x'used,
    uninitialized local variable 'y'used,
    uninitialized local variable 'width'used,
    uninitialized local variable 'height'used

Answer 1

我有一种感觉，你需要使用：

long x;
long y;
long width;
long height;

...

// Pass the addresses of objects where the values can be stored.
hr = plocation->accLocation(&x, &y, &width, &height, varChild);