元の質問で参照されているオプション1を実装することになりました。
VBA でファイルを「チャンク」し、各「チャンク」を Web サービスに転送します。ここにあるコードに基づいて、ソリューションの VBA 部分を作成しました: Copy Large File by Chunk with Progress Notification。ただし、ファイル システムにコピーする代わりに、サーバーに送信します。
コード: VBA ランド
ファイルチャンクを作成する（醜い）VBAコードは次のとおりです。
Function CopyFileByChunk(fileName As String, sSource As String) As Boolean
Dim FileSize As Long, OddSize As Long, SoFar As Long
Dim Buffer() As Byte, f1 As Integer, ChunkSize As Long
On Error GoTo CopyFileByChunk_Error
f1 = FreeFile: Open sSource For Binary Access Read As #f1
FileSize = LOF(f1)
If FileSize = 0 Then GoTo Exit_CopyFileByChunk ' -- done!
ChunkSize = 5505024 '5.25MB
OddSize = FileSize Mod ChunkSize
Dim index As Integer
index = 0
If OddSize Then
ReDim Buffer(1 To OddSize)
Get #f1, , Buffer
index = index + 1
SoFar = OddSize
If UploadFileViaWebService(Buffer, fileName, index, SoFar = FileSize) Then
g_frmProgress.lblProgress = "Percent uploaded: " & Format(SoFar / FileSize, "0.0%")
Debug.Print SoFar, Format(SoFar / FileSize, "0.0%")
DoEvents
Else
GoTo CopyFileByChunk_Error
End If
End If
If ChunkSize Then
ReDim Buffer(1 To ChunkSize)
Do While SoFar < FileSize
Get #f1, , Buffer
index = index + 1
SoFar = SoFar + ChunkSize
If UploadFileViaWebService(Buffer, fileName, index, SoFar = FileSize) Then
g_frmProgress.lblProgress = "Percent uploaded: " & Format(SoFar / FileSize, "0.0%")
Debug.Print SoFar, Format(SoFar / FileSize, "0.0%")
DoEvents
Else
GoTo CopyFileByChunk_Error
End If
Loop
End If
CopyFileByChunk = True
Exit_CopyFileByChunk:
Close #f1
Exit Function
CopyFileByChunk_Error:
CopyFileByChunk = False
Resume Exit_CopyFileByChunk
End Function
チャンクをサーバーにアップロードする、参照されている VBA メソッドは次のとおりです。
Public Function UploadFileViaWebService(dataChunk() As Byte, fileName As String, index As Integer, lastChunk As Boolean) As Boolean
On Error GoTo ErrHand
Dim blnResult As Boolean
blnResult = False
'mdlConvert.SetProgressInfo "Connecting to the web server:" & vbNewLine & _
DQUOT & server_title() & DQUOT
If InternetAttemptConnect(0) = 0 Then
On Error Resume Next
Dim strSoapAction As String
Dim strXml As String
strXml = "<?xml version=""1.0"" encoding=""utf-8""?>" & _
"<soap:Envelope xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"" xmlns:xsd=""http://www.w3.org/2001/XMLSchema"" xmlns:soap=""http://schemas.xmlsoap.org/soap/envelope/"">" & _
"<soap:Body>" & _
"<UploadZipFile xmlns=""http://something.com/"">" & _
"<zipBytes></zipBytes>" & _
"<index>" & index & "</index>" & _
"<isLastChunk>" & IIf(lastChunk, 1, 0) & "</isLastChunk>" & _
"</UploadZipFile>" & _
"</soap:Body>" & _
"</soap:Envelope>"
Dim objXmlhttp As Object
Dim objDom As Object
Set objXmlhttp = New MSXML2.xmlhttp
' Load XML
Set objDom = CreateObject("MSXML2.DOMDocument")
objDom.LoadXML strXml
'insert data chunk into XML doc
objDom.SelectSingleNode("//zipBytes").dataType = "bin.base64"
objDom.SelectSingleNode("//zipBytes").nodeTypedValue = dataChunk
' Open the webservice
objXmlhttp.Open "POST", webServiceUrl, False
' Create headings
strSoapAction = "http://something.com/UploadZipFile"
objXmlhttp.setRequestHeader "Content-Type", "text/xml; charset=utf-8"
objXmlhttp.setRequestHeader "SOAPAction", strSoapAction
' Send XML command
objXmlhttp.send objDom.XML
' Get all response text from webservice
Dim strRet
strRet = objXmlhttp.responseText
' Close object
Set objXmlhttp = Nothing
Set objDom = Nothing
'get the error if any
Set objDom = CreateObject("MSXML2.DOMDocument")
objDom.LoadXML strRet
Dim isSoapResponse As Boolean
isSoapResponse = Not (objDom.SelectSingleNode("//soap:Envelope") Is Nothing)
Dim error As String
If Not isSoapResponse Then
error = "Woops"
Else
error = objDom.SelectSingleNode("//soap:Envelope/soap:Body/soap:Fault/faultstring").text
End If
If error <> "" Then
ShowServerError error, True
blnResult = False
Else
Err.Clear 'clear the error caused in the XPath query above
blnResult = True
End If
'close dom object
Set objDom = Nothing
Else
GetErrorInfo "UploadFileViaWebService:InternetCheckConnection"
End If
ErrHand:
If Err.Number <> 0 Then
ShowError Err, "UploadFileViaWebService"
blnResult = False
End If
UploadFileViaWebService = blnResult
End Function
コード: C# ASMX Web サービス
サーバー側では、Web サービス メソッドがいくつかの重要なパラメーターを受け取ります。
- string fileName: ファイルの名前 (各チャンクは同じファイル名です)
- byte[] zipBytes: 各チャンクの内容
- int index: インデックス (fileName と組み合わせて使用され、ファイル システム上で一意の順序付けられた部分ファイルを提供します)
- bool isLastChunk: これは「完了です。先に進んで、すべての「チャンク」をマージし、自分でクリーンアップしてください」フラグです。
int index と bool isLastChunk. VBA の世界から提供されたこのコンテキストを使用して、これらのファイル チャンクをそれぞれ保存し、isLastChunk フラグが true の場合にそれらを結合する方法を十分に理解しています。
/// <summary>
/// Accepts a chunk of a zip file. Once all chunks have been received, combines the chunks into a zip file that is processed.
/// </summary>
/// <param name="fileName">Name of the file.</param>
/// <param name="zipBytes">The collection of bytes in this chunk.</param>
/// <param name="index">The index of this chunk.</param>
/// <param name="isLastChunk">if set to <c>true</c> this is the last chunk.</param>
/// <returns>Whether the file was successfully read and parsed</returns>
/// <exception cref="ParserException">An error occurred while trying to upload your file. The details have been written to the system log.</exception>
[WebMethod]
public bool UploadZipFile(string fileName, byte[] zipBytes, int index, bool isLastChunk)
{
try
{
const string ModuleRootUrl = "/Somewhere/";
string folderName = HostingEnvironment.MapPath("~" + ModuleRootUrl);
string fullDirectoryName = Path.Combine(folderName, Path.GetFileNameWithoutExtension(fileName));
try
{
if (!Directory.Exists(fullDirectoryName))
{
Directory.CreateDirectory(fullDirectoryName);
}
string pathAndFileName = Path.Combine(fullDirectoryName, AddIndexToFileName(fileName, index));
using (var stream = new MemoryStream(zipBytes))
{
WriteStreamToFile(stream, pathAndFileName);
}
if (isLastChunk)
{
try
{
MergeFiles(fullDirectoryName, fileName, index);
// file transfer is done.
// extract the zip file
// and do whatever you need to do with its contents
// we'll assume that it works - but your "parsing" should return true or false
return true;
}
finally
{
DeleteDirectoryAndAllContents(fullDirectoryName);
}
}
}
catch
{
DeleteDirectoryAndAllContents(fullDirectoryName);
throw;
}
}
return false;
}
各受信チャンクをファイル システムに書き込む C# コードを次に示します。
/// <summary>
/// Writes the contents of the given <paramref name="stream"/> into a file at <paramref name="newFilePath"/>.
/// </summary>
/// <param name="stream">The stream to write to the given file</param>
/// <param name="newFilePath">The full path to the new file which should contain the contents of the <paramref name="stream"/></param>
public static void WriteStreamToFile(Stream stream, string newFilePath)
{
using (FileStream fs = File.OpenWrite(newFilePath))
{
const int BlockSize = 1024;
var buffer = new byte[BlockSize];
int numBytes;
while ((numBytes = stream.Read(buffer, 0, BlockSize)) > 0)
{
fs.Write(buffer, 0, numBytes);
}
}
}
すべての zip ファイルの「チャンク」をマージする C# コードを次に示します。
/// <summary>
/// Merges each file chunk into one complete zip archive.
/// </summary>
/// <param name="directoryPath">The full path to the directory.</param>
/// <param name="fileName">Name of the file.</param>
/// <param name="finalChunkIndex">The index of the last file chunk.</param>
private static void MergeFiles(string directoryPath, string fileName, int finalChunkIndex)
{
var fullNewFilePath = Path.Combine(directoryPath, fileName);
using (var newFileStream = File.Create(fullNewFilePath))
{
for (int i = 1; i <= finalChunkIndex; i++)
{
using (var chunkFileStream = new FileStream(AddIndexToFileName(fullNewFilePath, i), FileMode.Open))
{
var buffer = new byte[chunkFileStream.Length];
chunkFileStream.Read(buffer, 0, (int)chunkFileStream.Length);
newFileStream.Write(buffer, 0, (int)chunkFileStream.Length);
}
}
}
}