from---yangzheng
附件存储一般为数据库存储，以2进制存储在表t_Accessory 的FData字段中。

sFileName 为本地文件，例如：C:\Users\Desktop\11.txt
sTmpFileName 为保存临时文件路径，用于保存压缩本地文件后的临时文件例如 D:\CODE\temp.tmp
varFile 为 kdzip压缩文件后得到的二进制，用户保存到数据库

VB 保存
Public Function SaveData()
Dim ozip As Object
Dim sFileName As String
Dim sTmpFileName As String
Dim smFile As Stream
Dim smFileNoCompress As Stream
Dim varFile As Variant
Dim bytFile() As Byte

Set ozip = CreateObject("KDZIP.ZIP")
ozip.Compress sFileName, sTmpFileName, 7
Set ozip = Nothing
Set smFile = New ADODB.Stream
Set smFileNoCompress = New ADODB.Stream
smFile.Type = adTypeBinary
smFile.Open
smFile.LoadFromFile sTmpFileName
bytFile() = smFile.Read
Set smFile = Nothing
varFile = bytFile()
End Function

C#
//SQL存储方式
private DataTable SQLStore()
{
DataTable rtn = new DataTable();
string desFilePath = HttpContext.Current.Server.MapPath("./") + FileUpload1.FileName;
if (FileUpload1.HasFile)
{
FileUpload1.MoveTo(desFilePath, MoveToOptions.Overwrite);
KDZipLib zip = new KDZipLib();
FileStream FStream = new FileStream(desFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
byte[] data = new byte[FStream.Length];
FStream.Read(data, 0, data.Length);
FStream.Close();

string strFileName = Path.GetFileName(FileUpload1.FileName);
string strFileSize = Math.Floor(FileUpload1.ContentLength / 1024f) + "K";
DataRow dr = AccessoryData.NewRow();
DataTable dt = AccessoryData;
dr["FIndex"] = dt.Rows.Count + 1;
dr["FID"] = -dt.Rows.Count - 1;
dr["FUploadTime"] = K3DateTimeFormatInfo.K3LongDateFormat(DateTime.Now);
//附件数据
dr["FData"] = zip.Zip(data);
dr["FFilename"] = strFileName;
dr["FFileSize"] = Convert.ToInt32(data.Length);
dr["FDesc"] = this.fileDesc.Value;
dr["FUploader"] = MMTS.K3Connect.GetProperty("UserID");
if (this.m_FPage <= 1)
{
dr["FPage"] = 0;
dr["FEntryID"] = 0;
}
else
{
dr["FPage"] = this.m_FPage - 1;
dr["FEntryID"] = this.m_FEntryID;
}
dr["FSaveMode"] = 0;//为SQL存储
dt.Rows.Add(dr);
rtn = dt;
}
return rtn;

}

VB 打开
Private Function DownLoadFile(ByVal AccessoryID As Long)
Dim sFileName As String
Dim obj As Object
Dim varFile As Variant
Dim smFile As Stream

Set obj = CreateObject(ACCESSORYVIEW)
varFile = obj.GetID(MMTS.PropsString, AccessoryID) '此处先取出FData中的2进制。
Set obj = Nothing
Set smFile = New Stream
smFile.Type = adTypeBinary
smFile.Open
smFile.Write varFile
smFile.SaveToFile m_sTempFileName, adSaveCreateOverWrite 'm_sTempFileName 为保存文件路径，可自行设置。
Set smFile = Nothing
End Function

C#打开
其中FVersion 2.0 为采用了KDZipLib压缩过，没压缩请赋值1.0
public void DownLoadFile()
{
KDZipLib zip = new KDZipLib();
DataRow dr; //dr为t_accessory中取出的附件的记录
byte[] inputBytes = null;
string tempStr = DateTime.Now.ToFileTime().ToString() + "_" + dr["FFilename"].ToString();
sFileName = HttpContext.Current.Server.MapPath("./") + tempStr;
if (dr["FVersion"].ToString().Equals("2.0"))
{
inputBytes = zip.UnZip((byte[])dr["FData"]);
}
else
{
inputBytes = (byte[])dr["FData"];
}
using (bw = new BinaryWriter(new FileStream(sFileName, FileMode.Create)))
{
bw.Write(inputBytes);
bw.Close();
}
}