控制写文件的次数Appendfile

写文件记录，用什么方法控制是唯一的一条记录；记录了多条； If(MarketPosition==0 and AMA1[1]>AMA2[1] ) { BUY(0,OPEN); CTR1=0; } If(MarketPosition==1 and AMA1[1]<AMA2[1] ) { fileENtry=EntryPrice;FileTime1=FileTime0;FileDate1=FileDate0; Sell(0,OPEN); IF( CTR1==0 ) { CTR1=1; FileAppend("D:\\aaa", TEXT(FileDate1)+","+ TEXT(FileTime1)+","+ SymbolName+ "fileENtry"+Text(fileENtry) +","+TEXT(Open ) );} } If(MarketPosition==0 and AMA1[1]<AMA2[1] ) { SellShort(0,OPEN); CTR1=0; } If(MarketPosition==-1 and AMA1[1]>AMA2[1] ) { fileENtry=EntryPrice;FileTime1=FileTime0;FileDate1=FileDate0; BuyToCover(0,OPEN); IF( CTR1==0 ) { CTR1=1; FileAppend("D:\\aaa", TEXT(FileDate1)+","+ TEXT(FileTime1)+","+ SymbolName+ "fileENtry"+Text(fileENtry) +","+TEXT(Open ) );}