Dynamic arrays

Im having a little problem with dynamic arrays..
I have a struct:

Code:

typedef struct _SFont
{
ID3DXFont  *fontobj;
LOGFONT     fontparams;
char        *name;
}SFont;

i declare a pointer to that struct:

Code:

SFont *rFont;

My class constructor:

Code:

ObjectBuilder::ObjectBuilder()
{
   rFont = (SFont*)malloc(sizeof *rFont);
   fontnum = 0;   //fontnum is a counter
}

I have a function that increases the fontnum and must resize the array:

Code:

void ObjectBuilder::CreateFont(char *Name, int size)
{
   fontnum += 1;
   //allocate more space
rFont = (SFont*)realloc(rFont, fontnum * sizeof *rFont);
//So, now the array should have fontnum-1 slots, right?
rFont[fontnum].Name = Name;

There is some code to create a font, but thats all we need. The problem is that I can only call 1 time this function, meaning that I can only add 1 more font. If i call it again, it crashes! I free the array using:

Code:

free (rFont);
rFont=NULL;

But when I exit the program, having created 1 font, it crashes for once more in the debug and shows me some asm code. Thank you very much!

Code:

>void ObjectBuilder::CreateFont(char *Name, int size)
>{
>   fontnum += 1;
>   //allocate more space
>rFont = (SFont*)realloc(rFont, fontnum * sizeof *rFont);
>//So, now the array should have fontnum-1 slots, right?
>rFont[fontnum].Name = Name;

Change this to:
rFont[fontnum-1].Name = Name;

Ive done it, and it doesn return the correct name.. also it crashes

Since arrays start at 0, if fontnum is 1, this only gives you one slot:
rFont[0]
When you say it doesn't return the correct name, which slot are you reading from, 0 or 1?

If you actually want a rFont[1] when fontnum is 1, then you would need to change this:

>rFont = (SFont*)realloc(rFont, fontnum * sizeof *rFont);

to:

rFont = (SFont*)realloc(rFont, (fontnum+1) * sizeof *rFont);

Then just use your original code:

rFont[fontnum].Name = Name;