[PB] PB中读写文件通用的两个函数

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PB中读写文件通用的两个函数

1、文件读取 :


//函数名:f_readfile
//功能:读取文件
//参数:
//  io_file:ref blob 大对象类型,存储读出的文件内容;
//  is_filename:string 文件名
//返回值:int  1-成功 0-失败

LONG ll_len
int li_FileNum,li_count,loops,i,bytes_read
blob lblb_b,tot_b
int liResult=1

ll_len=FileLength(is_filename)
IF ll_len > 32765 THEN
 IF Mod(ll_len, 32765) = 0 THEN
  loops = ll_len/32765    
 ELSE
  loops = (ll_len/32765) + 1
 END IF
ELSE
 loops = 1
END IF  

li_FileNum =  FileOpen(is_filename,StreamMode!, read!, lockread!)
if li_filenum = -1 then
 messagebox("","无法打开文件"+ is_filename)
end if

FOR i = 1 to loops
 bytes_read=FileRead(li_FileNum, lblb_b)
 if bytes_read = -1 then
        messagebox("","读取文件"+is_filename+"失败!")
    liResult = 0
    exit
 end if
 if i=1 then
  tot_b = lblb_b
 else
  tot_b = tot_b + lblb_b
 end if 
NEXT
Fileclose(li_FileNum)

if liResult = 1 then
 ib_file=tot_b
end if

return liResult

2、文件写入 :


//函数名:f_writefile
//功能:写入文件
//参数:
//  io_file:blob  大对象类型,存储将写入的文件内容;
//  is_filename:string  文件名
//返回值:int  1-成功 0-失败


uLONG ll_len,li_count,loops
int li_FileNum
blob lblb_b
int liResult = 1

ll_len=len(ib_file)
IF ll_len > 32765 THEN
 IF Mod(ll_len, 32765) = 0 THEN
  loops = ll_len/32765    
 ELSE
  loops = (ll_len/32765) + 1
 END IF
ELSE
 loops = 1
END IF  


li_FileNum =  FileOpen(is_filename,StreamMode!, write!, shared!,Replace!)
if li_FileNum = -1 then
 messagebox("系统提示","无法打开文件"+is_filename)
 return 0
end if
FOR li_count = 1 to loops
 lblb_b = blobmid( ib_file , ( li_count - 1) * 32765 + 1 , 32765 )   
 if FileWrite(li_FileNum, lblb_b) = -1 then
  messagebox("系统提示","写文件" + is_filename+"失败")
  liResult=0
  exit
 end if//8010
NEXT
Fileclose(li_FileNum)

//if liResult=1 then
// liResult = gf_setfiletime(is_filename,idt_file_time)
//end if

return liResult

 

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