getting a Double with GetDlgItemInt

My problem is pretty simple
have an app when i need to be able to get Decimel number from an edit control, i am trying to do this using the GetDlgItemInt function, which by itsn ame and by testing seems to only work for ints.
Process would be
User enters number hits button IE 4.23->

Code:

---

i do 
double ViNum = GetDlgItemInt(hwnd, IDC_VI, &ViSuccess, FALSE);
then i do
if (ViSuccess  && TSuccess  && !DSuccess && !DFound) {
  stevenfritz("Use 1 to find D", "Notice"); // debug code
  DNum = Dis1(ViNum, TNum, ANum);
  DFound = TRUE;
  SetDlgItemInt(hwnd, IDC_D, DNum, TRUE );

      }

---

Despite my Searching with google and MSDN i can't find a suitable function to do this for me, and i hope to be able to do this without doign it by hand :)
Any help is much appreceated

good old atof()

Code:

---

char* ViStr;
 int len = GetWindowTextLength(GetDlgItem(hwnd, IDC_VI));
 ViStr = (char*)GlobalAlloc(GPTR, len + 1);
 GetDlgItemText(hwnd, IDC_VI, ViStr, len + 1);
 ViNum = atof(ViStr);

---

sscanf is better.

aaah stop making me rewrite code with faster stuff you evil man! :P
ah well smal lrewrite of couple functions

GetDlgItemText(hwnd, IDC_VI, ViStr, len + 1);

I think you ment

GetDlgItemText(hwnd, IDC_VI, ViStr, len);