VC得到编辑框HWND 怎么得到内容

int GetWindowText(
HWND hWnd, // handle to window or control
LPTSTR lpString, // text buffer
int nMaxCount // maximum number of characters to copy
);

CString GetText()
{
UpdateData(true);
CString str;
GetDlgItemText(IDC_EDIT1,str);//IDC_EDIT1 编辑框ID
Return str;
}