将指针转换为C ++中的数组 [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的指针，我想将该内存映射视为一个数组。

这里是我基本想要做的：

  char Array [] =（char *）CreateFileMapping 
  

除了显然我不能简单地挥动我的手臂，并声明一个指针现在是一个数组。 / p>

你们有什么想法我该怎么做吗？我不想将指针指向的值复制到数组中，因为这将对大文件使用太多的内存。

感谢一堆， p>

解决方案

您不需要。您可以将指针索引为一个数组：

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

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

Here's what I basically want to do:

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

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

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.

Thanks a bunch,

解决方案

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

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

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