函數名：responsefile
功能 ：客戶端從服務器端下載一個文件
返回值：返回true表示服務器響應成功，返回false表示失敗
參數 ：
pageresponse 響應客戶端的response對象，用page.response引用
downloadfilename 客戶端下載文件的文件名
localfilepath 服務器端待下載文件的路徑
downloadbuffer 服務器端讀取文件的緩沖區大小，單位為kb
| public function responsefile(byref pageresponse as httpresponse, byval downloadfilename as string, byval localfilepath as string, byval downloadbuffer as long) as boolean dim reader as system.io.filestream dim buffer() as byte dim filelength as long dim filebuffer as long = 1024 * downloadbuffer dim readcount as long readcount = filebuffer redim buffer(readcount - 1) try reader = system.io.file.openread(localfilepath) filelength = reader.length try pageresponse.buffer = false pageresponse.addheader("connection", "keep-alive") pageresponse.contenttype = "application/octet-stream" pageresponse.addheader("content-disposition", "attachment;filename=" + downloadfilename) pageresponse.addheader("content-length", filelength.tostring) while readcount = filebuffer readcount = reader.read(buffer, 0, filebuffer) redim preserve buffer(readcount - 1) pageresponse.binarywrite(buffer) end while response.end() catch ex as exception return false finally reader.close() end try catch ex as exception return false end try return true end function |
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