Problem hex string to char * ..

[Fuji22]

I want to transform hex string I type in Edit Box (MFC) to a char *

like...

aa bb cc dd ee ff 03 f8 d3 fe

typed that in Edit Box and when I press convert button

It should make that into char array well yah char * same thing.

This is what I got so far but for some reason yes it compiles great but when I press convert it crashes

char strData[255] = {0};//held from Edit Box.
char * intercept = NULL;



LRESULT res;

res = SendMessage(GetDlgItem(hDlg,IDC_EDIT),WM_GETTEXTLENGTH,0,0);
if(((int)res == 0 || (int)res > 999))// we want text but not bigger than limit.
{
return 0;
}
SendMessage(GetDlgItem(hDlg,IDC_EDIT),WM_GETTEXT,sizeof(strData),(LPARAM)strData);

char* temp=strdup(strData);

//Convert a hexyString to a hex character and put in array
for(int i = 0; i < res; i++)
intercept[i] = strtoul(temp, &temp, 0x10);
delete[] temp;
temp = 0;




yah.. thats about it

well I know I ain't that smart to figure this out so if anyone could help I'd really like that