在CallBack函数中删除由new创建的指针 [英] delete pointers created by new in CallBack Function

问题描述

我执行以下操作：

LRESURT CALLBACK WindowProc{
    .......
    Case VK_RETURN:
        int i;
        for ( i = 0; i <1000; i++) {
            int  size = determinesize(i);
            int *pttest = new int[size];
            .....(some work)....
            delete[] pttest;
        }
     ........
}

但是，当 VK_RETURN 发生时，我遇到问题。如果我不使用 delete [] pttest 。

But I got problem when VK_RETURN occurs. If I don't use delete[] pttest.

我的问题是：我需要删除ptttest ？当我在google上搜索时，几乎每个人都说，对于每一个新的，必须有一个删除。另一个问题是：如果我把 VK_RETURN 的for循环代码放在一个函数中，比如说 void whenvkreturn（）那么我需要删除pttest吗？因为任何局部变量在返回后被销毁，我猜这个循环中创建的1000个对象将被自动删除，对吗？我不知道堆栈很好，所以一些解释我发现是不清楚为我。

My question is that: Do I need to delete ptttest? When I search on google, almost everyone said that for each new, there must be a delete. Another question is that: if I put the for loop code for VK_RETURN in a function, say void whenvkreturn(), then do I need to delete pttest? Since any local variables are destroyed after returning, I guess the 1000 objects created in this loop will be deleted automatically, right? I don't know the stack very well, so some explanation I found is not clear for me.

=====

OK，有一个向量的解决方法。但是在这种情况下：

OK, there is a vector workaround. But when it is the case:

TCHAR * text = new text [size];

我应该做什么？

推荐答案

您总是需要删除分配的内存。对于每个新，应该有删除，即使它在一个函数中。你正在接近的问题，可以很容易地通过使用动态大小，如std :: vector的其他容器来解决。在本地函数中使用动态容器，它会自动释放自己分配的内存，你不必担心。

You always need to delete allocated memory. For every new there should be a delete, even though it is in a function. The problem you are approaching, can easily be solved by using other containers with dynamic sizes, like std::vector. Using dynamic containers in local functions, it will automatically release the memory allocated by itself, and you don't have to worry.

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