Fenster inhalt Text Euere Fensters

Frage in Winprog?

Hallo!
brauche wieder euere Unterstützung? wie kann ich auf den Inhalt eines EDIT-Fenster zugreifen und in einem anderen EDIT-Fenster kopieren?
hier ist mein Code:

lay_Window->hWnd = CreateWindowEx(0L, szAppName, szTitle, WS_OVERLAPPEDWINDOW | WS_VISIBLE, 0,0, 640, 477, NULL, NULL, NULL, NULL);
lay_Window->hKarte = CreateWindowEx(0L, szChildName,"",WS_HSCROLL|WS_VSCROLL|ES_AUTOHSCROLL|ES_AUTOVSCROLL|WS_BORDER | WS_CHILD | WS_VISIBLE,0, 0, 512 ,410 , lay_Window->hWnd, NULL, NULL, NULL);
lay_Window->hWerte = CreateWindowEx(0L, szChild2Name,"",WS_BORDER | WS_CHILD | WS_VISIBLE,0, 410, 640 ,67 , lay_Window->hWnd, NULL, NULL, NULL);

lay_Window->hCancel= CreateWindowEx(0L, "BUTTON","Cancel",BS_DEFPUSHBUTTON | WS_CHILD | WS_VISIBLE,515, 360, 50, 18,lay_Window->hWnd, (HMENU)3, NULL, NULL);
lay_Window->hOk = CreateWindowEx(0L, "BUTTON","Ok",BS_DEFPUSHBUTTON | WS_CHILD | WS_VISIBLE,580, 360, 50, 18,lay_Window->hWnd, (HMENU)4, NULL, NULL);
lay_Window->hEdit1 = CreateWindowEx(0L, "EDIT", "4939", WS_BORDER|WS_CHILD | WS_VISIBLE , 515, 50, 50, 18, lay_Window->hWnd, (HMENU)5, NULL, NULL);
lay_Window->hEdit2 = CreateWindowEx(0L, "EDIT", "7222", WS_BORDER|WS_CHILD | WS_VISIBLE , 570, 50, 40, 18, lay_Window->hWnd, (HMENU)6, NULL, NULL);
lay_Window->hEdit3 = CreateWindowEx(0L, "EDIT", "00853", WS_BORDER|WS_CHILD | WS_VISIBLE , 515,80 , 50, 18, lay_Window->hWnd, (HMENU)7, NULL, NULL);
lay_Window->hEdit4 = CreateWindowEx(0L, "EDIT", "ED", WS_BORDER|WS_CHILD | WS_VISIBLE , 570, 80, 40, 18, lay_Window->hWnd, (HMENU)8, NULL, NULL);
/*---------------- Zugriff Auf EDIT-Fenster "4939" und Inhalt in EDIT Fenseter "ED" kopieren----------------------*/
int len = GetWindowTextLength(GetDlgItem(lay_Window->hWnd, 4939));
if(len > 0)
{
int i;
char* buf;

buf = (char*)GlobalAlloc(GPTR, len + 1);
GetDlgItemText(lay_Window->hWnd,4939 , buf, len + 1);

//... do stuff with text ...

SendDlgItemMessage(lay_Window->hWnd, ED, LB_SETITEMDATA, 0, (LPARAM)buf);


GlobalFree((HANDLE)buf);
}
.....

Danke
NR