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(Classic ASP) Azure File Service: Upload Large FileSample code to upload a large file to a directory in a share in the Azure File Service. A file is uploaded by first creating the file in the Azure share and then writing ranges of bytes to the file. Azure imposes a 4MB limit for each PUT to write a range. Files larger than 4MB need to be uploaded by making multiple "Put Range" calls. This example uploads a large file requiring multiple "Put Range" calls.
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body> <% ' Azure File Service Example: Upload a large file. ' See: https://docs.microsoft.com/en-us/rest/api/storageservices/create-share ' also see: https://docs.microsoft.com/en-us/rest/api/storageservices/put-range ' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Rest") set rest = Server.CreateObject("Chilkat.Rest") ' Connect to the Azure Storage Blob Service bTls = 1 port = 443 bAutoReconnect = 1 ' In this example, the storage account name is "chilkat". success = rest.Connect("chilkat.file.core.windows.net",port,bTls,bAutoReconnect) If (success <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( rest.LastErrorText) & "</pre>" Response.End End If ' This example will upload a larger file. localFilePath = "qa_data/zips/somethingBig.zip" ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.FileAccess") set fac = Server.CreateObject("Chilkat.FileAccess") ' Note: The FileSize method returns a signed 32-bit integer. If the file is potentially larger than 2GB, call FileSizeStr instead to return ' the size of the file as a string, then convert to an integer value. szLocalFile = fac.FileSize(localFilePath) If (szLocalFile < 0) Then Response.Write "<pre>" & Server.HTMLEncode( fac.LastErrorText) & "</pre>" Response.End End If ' Provide Azure Cloud credentials for the REST calls. ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.AuthAzureStorage") set azAuth = Server.CreateObject("Chilkat.AuthAzureStorage") azAuth.AccessKey = "AZURE_ACCESS_KEY" ' The account name used here should match the 1st part of the domain passed in the call to Connect (above). azAuth.Account = "chilkat" azAuth.Scheme = "SharedKey" azAuth.Service = "File" ' This causes the "x-ms-version: 2021-08-06" header to be automatically added. azAuth.XMsVersion = "2021-08-06" success = rest.SetAuthAzureStorage(azAuth) ' Note: The application does not need to explicitly set the following ' headers: x-ms-date, Authorization. These headers ' are automatically set by Chilkat. ' However, a few additional headers are required for the "Create File" operation: success = rest.AddHeader("x-ms-type","file") ' This required header specifies the final size of the file (or the maximum size it can be). ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder") set sbFileSize = Server.CreateObject("Chilkat.StringBuilder") success = sbFileSize.AppendInt(szLocalFile) success = rest.AddHeader("x-ms-content-length",sbFileSize.GetAsString()) ' Send a PUT request to create the file (or replace the file if it already exists). ' This will initialize the file in the Azure file storage. To upload content, we'll need ' to do the "Put Range" operation one or more times. ' The following will create the file "somethingBig.zip" in the share "pip" responseStr = rest.FullRequestNoBody("PUT","/pip/somethingBig.zip") If (rest.LastMethodSuccess <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( rest.LastErrorText) & "</pre>" Response.End End If ' When successful, the Azure File Service will respond with a 201 (Created) response status code, ' with no XML response body. If an error response is returned, there will be an XML response body. If (rest.ResponseStatusCode <> 201) Then ' Examine the request/response to see what happened. Response.Write "<pre>" & Server.HTMLEncode( "response status code = " & rest.ResponseStatusCode) & "</pre>" Response.Write "<pre>" & Server.HTMLEncode( "response status text = " & rest.ResponseStatusText) & "</pre>" Response.Write "<pre>" & Server.HTMLEncode( "response header: " & rest.ResponseHeader) & "</pre>" Response.Write "<pre>" & Server.HTMLEncode( "response body (if any): " & responseStr) & "</pre>" Response.Write "<pre>" & Server.HTMLEncode( "---") & "</pre>" Response.Write "<pre>" & Server.HTMLEncode( "LastRequestStartLine: " & rest.LastRequestStartLine) & "</pre>" Response.Write "<pre>" & Server.HTMLEncode( "LastRequestHeader: " & rest.LastRequestHeader) & "</pre>" Response.End End If Response.Write "<pre>" & Server.HTMLEncode( "Successfully created somethingBig.zip") & "</pre>" ' -------------------------------------------------------------------------------- ' Upload the file data... ' Make sure the headers from the "Create File" operation are removed. success = rest.ClearAllHeaders() ' The x-ms-write header is required for each "Put Range" request. success = rest.AddHeader("x-ms-write","update") ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder") set sbRange = Server.CreateObject("Chilkat.StringBuilder") ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder") set sbResponseBody = Server.CreateObject("Chilkat.StringBuilder") ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.BinData") set bdFileData = Server.CreateObject("Chilkat.BinData") ' Open the file. We'll be reading and uploading in chunks.. success = fac.OpenForRead(localFilePath) If (success <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( fac.LastErrorText) & "</pre>" Response.End End If numBytesLeft = szLocalFile curIndex = 0 Do While numBytesLeft > 0 chunkSize = numBytesLeft ' Azure allows for 4MB max chunks (4 x 1024 x 1024 = 4194304) If (chunkSize > 4194304) Then chunkSize = 4194304 End If ' The only tricky part here is to correctly add the x-ms-range header. ' It will be formatted like this: ' x-ms-range: bytes=0-759623 sbRange.Clear success = sbRange.Append("bytes=") success = sbRange.AppendInt(curIndex) success = sbRange.Append("-") success = sbRange.AppendInt(curIndex + chunkSize - 1) ' This replaces the header if it already exists.. success = rest.AddHeader("x-ms-range",sbRange.GetAsString()) ' Read the next chunk from the local file. success = bdFileData.Clear() success = fac.FileReadBd(chunkSize,bdFileData) success = rest.FullRequestBd("PUT","/pip/somethingBig.zip?comp=range",bdFileData,sbResponseBody) If (success <> 1) Then ' This would indicate a failure where no response was received. Response.Write "<pre>" & Server.HTMLEncode( rest.LastErrorText) & "</pre>" Response.End End If ' A 201 response indicates the chunk was uploaded. If (rest.ResponseStatusCode <> 201) Then ' Examine the request/response to see what happened. Response.Write "<pre>" & Server.HTMLEncode( "response status code = " & rest.ResponseStatusCode) & "</pre>" Response.Write "<pre>" & Server.HTMLEncode( "response status text = " & rest.ResponseStatusText) & "</pre>" Response.Write "<pre>" & Server.HTMLEncode( "response header: " & rest.ResponseHeader) & "</pre>" Response.Write "<pre>" & Server.HTMLEncode( "response body (if any): " & responseStr) & "</pre>" Response.Write "<pre>" & Server.HTMLEncode( "---") & "</pre>" Response.Write "<pre>" & Server.HTMLEncode( "LastRequestStartLine: " & rest.LastRequestStartLine) & "</pre>" Response.Write "<pre>" & Server.HTMLEncode( "LastRequestHeader: " & rest.LastRequestHeader) & "</pre>" Response.End End If Response.Write "<pre>" & Server.HTMLEncode( "Uploaded chunk from " & curIndex & " to " & curIndex + chunkSize - 1) & "</pre>" curIndex = curIndex + chunkSize numBytesLeft = numBytesLeft - chunkSize Loop fac.FileClose Response.Write "<pre>" & Server.HTMLEncode( "success.") & "</pre>" %> </body> </html> |
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