为void指针分配和检索字符串数组-Assigningandretrievinganarrayofstringstoavoidpointer

I'm quite unfamiliar with how pointers work. I'm working with a function that callbacks a function with a void * context as an argument.

我对指针的工作方式很不熟悉。我正在使用一个函数来回调一个带有void * context作为参数的函数。

How would I go about assigning an array of strings to a void * and then retrieving them?

我如何将一个字符串数组分配给void *然后检索它们?

char callback_value[2][16];
snprintf(callback_value[0], sizeof(callback_value[0]), "string1");
snprintf(callback_value[1], sizeof(callback_value[1]), "string2");

// pass an array of strings into the void * callback context
void *callback_cOntext= callback_value;


// Illustration only, doesn't work

// retrieve it here
char **retrieved_strings = (char **)callback_context;


printf("%s", retrieved_strings[0]);  // Want "string1"
printf("%s", retrieved_strings[1]);  // Want "string2"

1 个解决方案

#include 
void func(void* arg)
{
  char (*tmp)[16] = arg;
  printf("%s\n%s\n", tmp[0], tmp[1]);
}
int main(void)
{
  char callback_value[2][16] = {"string1", "string2"};
  void *callback_cOntext= callback_value;
  func(callback_context);
  return 0;
}