Convert char* to char?

**Zwen** · 10-03-2002

I would like to strcpy() the content of the memoryblock pointed on by my_pointer to my_variable.

Code:

strcpy (my_variable, my_pointer);

Of course it does not work. How can I solve it?
Thank You.

**The Dog** · 10-03-2002

my_variable should have enough memory allocated to it.

IOW:

Code:

char my_variable[MAX_ARRAY];
..
..
..
strcpy(my_variable, my_pointer);

Of course, my_pointer should be pointing to a string in this case.

**Zwen** · 10-03-2002

Unfortunately the compiler tells me that now parameter 2 cannot be changed from 'char' to 'const char*'...

**The Dog** · 10-03-2002

You'll need to post more code.

Preferably the declaration of my_pointer and my_variable and where you allocate memory for my_pointer.

**elad** · 10-03-2002

my_pointer is probably pointing to a single char rather than a string.

**Zwen** · 10-03-2002

(ok, it's my first script in c++ so it became a little dirty... and long... and over-nested...)

I employ strtok() in one part of the programm and get char* var_Desk. Then I want to check, what var_Desk contains and return either var_Desk as var_Deskcheck or "0" as var_Deskcheck.

Code:

char fnc_Interpret (char lkv_Desk)
{
	char var_Deskcheck [8];

	if (lkv_Desk != 0) strcpy (var_Deskcheck, lkv_Desk);
	else if (lkv_Desk == 0) strcpy (var_Deskcheck, "0");

	return var_Deskcheck;
}

(I my code "my_variable" is "var_Deskcheck" and "my_pointer" is "var_Desk".)

Thanks.

**Zwen** · 10-03-2002

@ elad:
I thought I pointed to whatever strtok() returns, but I found no explicit explanation what strtok() really does...

**Cshot** · 10-03-2002

Lots of problems here:

- It's complaining because lkv_Desk is type char. You're passing it into strcpy which takes type char*

- And what's the purpose of this comparison?
(lkv_Desk != 0)
If you're checking for the NULL case then your else statement can simply be
var_Deskcheck[0] = '\0';

- return var_Deskcheck;
You can't do this because your char array will be out of scope after you've returned it. Either make a global char array or better yet, do a malloc and return the pointer.

Is this what you want?

Code:

char* fnc_Interpret (char* lkv_Desk)
{
   char* var_Deskcheck;
   var_Deskcheck = malloc(sizeof(char)*8);

   if (lkv_Desk != NULL)
      strcpy (var_Deskcheck, lkv_Desk);
   else
      var_Deskcheck = NULL;
   return var_Deskcheck;
}

Thread: Convert char* to char?

Thread Tools

Search Thread

Display

Convert char* to char?

Similar Threads

Converting a circulating mouse pointer to use a Potentionmeter

newbie needs help with code

Program Crashing

convert long to pointer to char array

Searching a linked list for char