第二重：文本信息与图片文件同时提交保存到数据库
图片文件也可保存到磁盘文件
这个问题已经不是什么新鲜问题了，网上也有大把的教程，但大多数是授人以鱼，而不授人以渔，经过辛苦的资料收集，思考，调试，整理，我基本上已经把这个问题从原理上搞清楚了，现在根据我自己的理解，在范例程序的基础上，加以解释，希望能对部分网友（比我还菜的:-)）有所帮助。
请诸位大虾能对其中的不正或不良这处予以指正。
程序中stream对象的用法上参考了“化境HTTP上传程序 Version 2.0”在代码，在此对稻香老农和梁无惧表示衷心的感谢和由衷的敬意。
上次讲了单个图片文件保存到数据库，这次讲一下文本信息与图片文件同时提交保存到数据库，图片文件也可保存到磁盘文件。
MultiInputOrImageToData.asp
<%@ Language=VBScript %>
<% option explicit %>
<%
'把一段二进制数据写入到一个文件
sub saveBin2File(srmSource,posB,posLen,strPath)
dim srmObj
set srmObj = server.CreateObject("adodb.stream")
srmObj.Type = 1
srmObj.Mode = 3
srmObj.Open
srmSource.Position = posB-1
srmSource.CopyTo srmObj,posLen
srmObj.Position = 0
srmObj.SaveToFile strPath,2'如果该文件已经存在，无条件覆盖
srmObj.Close
set srmObj = nothing
end sub
'二进制数据转换为字符串，包括汉字
function getTextfromBin(srmSource,posBegin,posLen)
dim srmObj, strData
set srmObj = server.CreateObject("adodb.stream")
srmObj.Type = 1
srmObj.Mode = 3
srmObj.Open
srmSource.position = posBegin-1'位置计数首数不一样，这个对象是对0开始的
srmSource.CopyTo srmObj,posLen
srmObj.Position = 0
srmObj.Type = 2
srmObj.Charset = "gb2312"
strData = srmObj.ReadText
srmObj.Close
set srmObj = nothing
getTextfromBin = strData
end function
'双字节字符串转换成单字节字符串
function getSBfromDB(bytString)
dim bin, i
bin = ""
for i=1 to len(bytString)
bin = bin & chrb(asc(mid(bytString,i,1)))
next
getSBfromDB = bin
end function
'单字节字符串转换成双字节字符串
function getDBfromSB(bitString)
dim str, i
str = ""
for i=1 to lenb(bitString)
str = str & chr(ascb(midb(bitString,i,1)))
next
getDBfromSB = str
end function
'从一个完整路径中析出文件名称
function getFileNamefromPath(strPath)
getFileNamefromPath = mid(strPath,instrrev(strPath,"\")+1)
end function
'判断函数
function iif(cond,expr1,expr2)
if cond then
iif = expr1
else
iif = expr2
end if
end function
'定义数据库连接字符串
dim cnstr
cnstr = "driver={Microsoft Access Driver (*.mdb)};dbq=" & server.MapPath("./upload.mdb")
%>
<HTML>
<HEAD>
<title>多个表单域或图像同步保存到数据库</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</HEAD>
<body>
<p>导航菜单：<b>上传图片</b><a href="ShowImageListFromData2.asp">显示图片</a><hr></p>
<%
if request.ServerVariables("REQUEST_METHOD") = "POST" then
dim sCome, binData
dim posB, posE, posSB, posSE
dim binCrlf, binSub
dim strTitle, strFileName, strContentType, posFileBegin, posFileLen, aryFileInfo
dim i, j
dim dicData
dim strName,strValue
binCrlf = getSBfromDB(vbcrlf)'定义一个单字节的回车换行符
binSub = getSBfromDB("--")'定义一个单字节的“--”字符串
set sCome = server.CreateObject("adodb.stream")
sCome.Type = 1'指定返回数据类型 adTypeBinary=1,adTypeText=2
sCome.Mode = 3'指定打开模式 adModeRead=1,adModeWrite=2,adModeReadWrite=3
sCome.Open
sCome.Write request.BinaryRead(request.TotalBytes)
sCome.Position = 0
binData = sCome.Read
'response.BinaryWrite binData'调试用：显示提交的所有数据
'response.Write "<hr>"'调试用
posB = instrb(binData,binSub)
posB = instrb(posB,binData,bincrlf) + 2'+2是加入回车换行符本身的长度
posB = instrb(posB,binData,getSBfromDB("name=""")) + 6
set dicData = server.CreateObject("scripting.dictionary")'用来保存信息
do until posB=6
posE = instrb(posB,binData,getSBfromDB(""""))
'Response.Write "name=" & getTextfromBin(sCome,posB,posE-posB) & "<br>"
strName = getTextfromBin(sCome,posB,posE-posB)
posB = posE + 1'指针移动到“"”的后面
posE = instrb(posB,binData,bincrlf)
'Response.Write posB & "->" & posE & "<br>"
if instrb(midb(binData,posB,posE-posB),getSBfromDB("filename=""")) > 0 then'判断成功表示这是一个file域
posB = instrb(posB,binData,getSBfromDB("filename=""")) + 10
posE = instrb(posB,binData,getSBfromDB(""""))
if posE>posB then
'response.Write "filename=" & getTextfromBin(sCome,posB,posE-posB) & "<br>"
strFileName = getFileNamefromPath(getTextfromBin(sCome,posB,posE-posB))
posB = instrb(posB,binData,getSBfromDb("Content-Type:")) + 14
posE = instrb(posB,binData,bincrlf)
'response.Write "content-type=" & getTextfromBin(sCome,posB,posE-posB) & "<br>"
strContentType = getTextfromBin(sCome,posB,posE-posB)
posB = posE + 4'这个地方换了两行，具体参看输出的原始二进制数据
posE = instrb(posB,binData,binSub)
'response.Write "image data="
'saveBin2File sCome,posB,posE-posB-1,server.MapPath("./") & "\test.jpg"
'Response.Write "<img src='test.jpg' border=0><br>"
posFileBegin = posB
posFileLen = posE-posB-1
strValue = strFileName & "," & strContentType & "," & posFileBegin & "," & posFileLen
else
'Response.Write "没有上传文件！" & "<br>"
strValue = ""
end if
else
posB = posE + 4'这个地方换了两行，具体参看输出的原始二进制数据
posE = instrb(posB,binData,binCrlf)
'Response.Write "value=" & getTextfromBin(sCome,posB,posE-posB) & "<br>"'这个后面没有“"”，所以不用-1
strValue = getTextfromBin(sCome,posB,posE-posB)
end if
dicData.Add strName,strValue
posB = posE + 2
posB = instrb(posB,binData,bincrlf) + 2
posB = instrb(posB,binData,getSBfromDB("name=""")) + 6
loop
strTitle = dicData.Item("txtTitle")
aryFileInfo = dicData.Item("filImage")
if aryFileInfo <> "" then'有文件数据上传
aryFileInfo = split(aryFileInfo,",")
strFileName = aryFileInfo(0)
strContentType = aryFileInfo(1)
posFileBegin = aryFileInfo(2)
posFileLen = aryFileInfo(3)
sCome.Position = posFileBegin-1
binData = sCome.Read(posFileLen)
dim cn, rs, sql
set cn = server.CreateObject("adodb.connection")
cn.Open cnstr
set rs = server.CreateObject("adodb.recordset")
sql = "select title,[content-type],image from tblImage2"
rs.Open sql,cn,1,3
rs.AddNew
rs.Fields("title").Value = strTitle
rs.Fields("content-type").Value = strContentType
'数据保存到数据库
rs.Fields("image").AppendChunk binData
'如果数据以文件形式保存到磁盘上，用下面这句
'saveBin2File sCome,posFileBegin,posFileLen,server.MapPath("./") & strFileName
rs.Update
rs.Close
set rs = nothing
cn.Close
set cn = nothing
Response.Write "<p>文件保存成功！</p>"
else
Response.Write "<p>没有上传文件！</p>"
end if
sCome.Close
set sCome = nothing
else
%>
<form id="frmUpload" name="frmUpload" action="<%=Request.ServerVariables("script_name")%>" method="post" target="_self" enctype="multipart/form-data">
<p>标题：<input id="txtTitle" type="text" name="txtTitle" size="40"></p>
<p>图片：<INPUT id="filImage" type="file" name="filImage" size="40"></p>
<INPUT id="btnUpload" type="submit" value="Upload" name="btnUpload">
</form>
<%
end if
%>
</body>
</HTML>
待续...
