listview problem, can't modify column name

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C

Windows

controls

There is a problem i cant figured out.

First, i insert three column in a listview control:

LVCOLUMN lvc;
lvc.mask = LVCF_WIDTH/*|LVCF_TEXT*/;
lvc.cx = 100;
//lvc.pszText = _T("");
::SendMessage(hwndList, LVM_INSERTCOLUMN, 0, (LPARAM)&lvc);
lvc.cx = 100;
::SendMessage(hwndList, LVM_INSERTCOLUMN, 1, (LPARAM)&lvc);
lvc.cx = 100;
::SendMessage(hwndList, LVM_INSERTCOLUMN, 2, (LPARAM)&lvc);

second, i want change the text of the column:

LVCOLUMN lvc = {0};
wchar_t buf[MAX_PATH];
lvc.mask = LVCF_TEXT;
lvc.pszText = buf;
g_LangMgr.GetString(IDS_USER, buf, MAX_PATH);//buf now is "i am wrong"
int ret = ::SendMessage(hwndList, LVM_SETCOLUMN, 0, (LPARAM)&lvc);

although ret equals 1 which means ok, but the column text is not displayed. when i uncomment the code in the first code fragment, it worked ok, and i want know where?