Thread: Dynamic array problem

Here is my code: The first, is the structure i use:

Code:

typedef struct _SFont
{
	ID3DXFont	*Fontobj;
	char		*name;
	LOGFONT		FontParams;

}SFont;

Then, i make a variable of that type, which i want it as an array later. I also have a counter.

Code:

unsigned int      counter;
SFont                *eFont;
char                  test[30];

Then, I have a function that increases the counter by one:

Code:

counter++;

I change the array size like that and attach a name to the current:

Code:

rFont = (SFont*)realloc(rFont, sizeof(SFont)*counter);

sprintf (test, "ArrayItem %i", counter);
rFont[counter].name = test;

somewhy, this code doesnt work, but crashes. Is there another way i could use dynamic arrays?

How would I use new to resize the array?
for example:

r = new int[count]; ??

if you don't have or don't want to use STL do this:

Code:

int size, i;
cout << "how big an array to do want";
cin >> size;
int * array = new int[size];
for(i = 0; i < size; i++)
{
  cout << ''enter value for element " << i << endl;
  cin >> array[i];
}

//to resize array:
//first declare temp array of same size as original
int * temp = new int[size];
//then copy all of original into temp
for(i = 0; i < size; i++)
{
  temp[i] = array[i];
}
//now get new size
int newsize;
cout << "enter new size for array";
cin >> newsize;
//delete memory originally reserved for array
delete [] array;
//declare new memory for array
array = new int[newsize];
//copy temp back into array
for(i = 0; i < size; i++)
{
  array[i] = temp[i];
}
//now delete memory reserved for temp
delete [] temp;
//assign NULL to temp
temp = NULL;

Now can add more values (as many as the difference between size and newsize) to array. Most of this is done for you when you use an STL vector.