怎么会错?4个饼(4分)

wly1:string;
wlya3:integer;
wlya3:=0;
wlya3:=wlya3+1;
wly1:=inttostr(wlya3);
167行: WritePrivateProfilestring('system','f1_wlya3',wly1,'C:/WINDOWS/SYSTEM/wly/wlysystem.ini');
wly1处怎么会出错?如下
[Error] netclient.pas(167): Incompatible types: 'String' and 'PChar'

WritePrivateProfilestring('system','f1_wlya3',pchar
~~~~~
(wly1),'C:/WINDOWS/SYSTEM/wly/wlysystem.ini');

谢谢!!!!