LVM_GETITEMTEXT这个消息怎么用？

int sel = SendMessage(GetDlgItem(hwndDlg, IDC_LSTRUN), LVM_GETNEXTITEM, -1, LVNI_SELECTED); if(-1 == sel) { MessageBox(hwndDlg, L"请先选择你要删除的启动项！", L"lazy_cat", MB_OK | MB_ICONINFORMATION); return TRUE; } if(IDYES == MessageBox(hwndDlg, L"确定删除该启动项？", L"提示", MB_YESNO | MB_ICONQUESTION)) { LVITEM selItem = { 0 }; selItem.mask = LVIF_TEXT; selItem.iSubItem = 1; int ret = SendMessage(GetDlgItem(hwndDlg, IDC_LSTRUN), LVM_GETITEMTEXT, (WPARAM)sel, (LPARAM)&selItem); return TRUE; } return TRUE;获取不到文本,ret都返回0