C ++设置字符的值** [英] C++ Set value for a char**

问题描述

我试图为 char ** 变量赋值。在我的 foo.h 中，我定义了一些变量，例如

I'm trying to assign a value to a char** variable. In my foo.h I've defined a couple of variables such as

#define APIOCTET         int
#define APILONG          long                  
#define APICHAR          char               
#define APISTRING        char* 

现在在 foo.cpp 我是tryng使用一个方法，其中

Now in my foo.cpp I'm tryng to use a method where

APILONG apiInitialize(APISTRING filePath, APISTRING* outputString)
{
  //open text file to where output will be printed
  //do other stuff, etc..
  //return result;
}

我想为我的 APISTRING * outputString 但我只是不知道如何这样做，我尝试了很多基本上是以下代码的变体

I'd like to assign a value to my APISTRING* outputString but I just can't figure out how to do so, I've tried many things which are basically a variation of the following code

APISTRING  error = "error";
APISTRING  other = "string";
APISTRING  charArr[] = { error, other, error };
APISTRING  *charArr2[] = { charArr };
errorString = *charArr2; 

也不是100％清楚什么是 APISTRING * outputString 。当我尝试编译它给我一个错误消息，它提到它是一个 char ** 。是一个二维数组吗？指向字符数组的指针？但最重要的是，我该如何为这个变量赋值呢？先感谢。

Also im not 100% clear on what exactly is APISTRING* outputString. When I try to compile it gives me an error message where it mentions it's a char**. Is it a 2D array?.. A pointer to an array of chars?.. But most importantly, how would I assign a value for this variable? Thanks in advance.

推荐答案

APISTRING *是指向char的指针。

The APISTRING* is a pointer to a pointer to char. It holds an address which holds the address of the first character of the string in memory.

查看此

See this question for more info on double pointers in C/C++.

要分配给您需要做的字符串，请使用C / C ++中的双指针更多信息的5814646 / c-double-pointer * outputString =string

To assign to the string you would need to do *outputString = "string"

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