转换的指针在C数组++ [英] Convert a pointer to an array in C++

问题描述

CreateFileMapping函数返回一个指向内存映射文件，我想对待那个内存映射为一个数组。

The CreateFileMapping function returns a pointer to a memory mapped file, and I want to treat that memory mapping as an array.

下面就是我基本上想要做的：

Here's what I basically want to do:

char Array[] = (char*) CreateFileMapping(...);

除了显然我不能简单地挥动手臂，并宣布一个指针现在是一个数组。

Except apparently I can't simply wave my arms and declare that a pointer is now an array.

难道你们有什么想法，我该怎么办呢？我不想复制指针指向到数组中的值，因为这将使用过多内存，大文件。

Do you guys have any idea how I can do this? I don't want to copy the the values the pointer is pointing to into the array because that will use too much memory with large files.

多谢，

推荐答案

您不需要。你可以索引的指针，如果它是一个数组：

You do not need to. You can index a pointer as if it was an array:

char* p = (char*)CreateFileMapping(...);
p[123] = 'x';
...

这篇关于转换的指针在C数组++的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！