Delphi DLL
Delphi DLL
Upload File in Blocks (with Content-MD5 header) and Commit the Block List
See more Azure Cloud Storage Examples
Demonstrates how to upload a file in blocks and then commit the block list. This example includes a Content-MD5 header for each block.Chilkat Delphi DLL Downloads
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, FileAccess, AuthAzureStorage, Rest, BinData, StringBuilder, Xml, Crypt2;
...
procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
rest: HCkRest;
bTls: Boolean;
port: Integer;
bAutoReconnect: Boolean;
azAuth: HCkAuthAzureStorage;
xml: HCkXml;
fac: HCkFileAccess;
blockSize: Integer;
numBlocks: Integer;
crypt: HCkCrypt2;
sbResponseBody: HCkStringBuilder;
uriPath: HCkStringBuilder;
blockId: PWideChar;
dataBlock: HCkBinData;
contentMd5: PWideChar;
i: Integer;
xmlStr: PWideChar;
responseStr: PWideChar;
begin
success := False;
// Azure Blob Service Example: Upload a file in blocks, and then commit the block list.
// See also: https://msdn.microsoft.com/en-us/library/azure/dd135726.aspx
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
rest := CkRest_Create();
// Connect to the Azure Storage Blob Service
bTls := True;
port := 443;
bAutoReconnect := True;
// In this example, the storage account name is "chilkat".
success := CkRest_Connect(rest,'chilkat.blob.core.windows.net',port,bTls,bAutoReconnect);
if (success <> True) then
begin
Memo1.Lines.Add(CkRest__lastErrorText(rest));
Exit;
end;
// Provide Azure Cloud credentials for the REST call.
azAuth := CkAuthAzureStorage_Create();
CkAuthAzureStorage_putAccessKey(azAuth,'AZURE_ACCESS_KEY');
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
CkAuthAzureStorage_putAccount(azAuth,'chilkat');
CkAuthAzureStorage_putScheme(azAuth,'SharedKey');
CkAuthAzureStorage_putService(azAuth,'Blob');
// This causes the "x-ms-version: 2021-08-06" header to be automatically added.
CkAuthAzureStorage_putXMsVersion(azAuth,'2021-08-06');
success := CkRest_SetAuthAzureStorage(rest,azAuth);
// Note: The application does not need to explicitly set the following
// headers: Content-Length, x-ms-date, Authorization. These headers
// are automatically set by Chilkat.
// As the blocks are uploaded, we'll keep an XML block list for the subsequent commit..
xml := CkXml_Create();
CkXml_putTag(xml,'BlockList');
// Any type of file can be uploaded in this way. It can a text file, binary file, anything...
// This example will upload an XML file that is approximately 275K in size. It can be downloaded
// at http://www.chilkatsoft.com/hamlet.xml
fac := CkFileAccess_Create();
success := CkFileAccess_OpenForRead(fac,'qa_data/xml/hamlet.xml');
// Assuming success for the example..
// We'll upload in 16K blocks (normally a program would upload in larger block sizes than this,
// but this is just an example...)
blockSize := 16384;
// How many 16K blocks? (Including 1 for the last partial block)
numBlocks := CkFileAccess_GetNumBlocks(fac,blockSize);
crypt := CkCrypt2_Create();
CkCrypt2_putHashAlgorithm(crypt,'md5');
sbResponseBody := CkStringBuilder_Create();
uriPath := CkStringBuilder_Create();
dataBlock := CkBinData_Create();
i := 0;
while i < numBlocks do
begin
CkBinData_Clear(dataBlock);
success := CkFileAccess_ReadBlockBd(fac,i,blockSize,dataBlock);
if (success = False) then
begin
Memo1.Lines.Add(CkFileAccess__lastErrorText(fac));
Exit;
end;
// Generate a base64 block ID.
// (Chilkat provides a helper method named GenBlockId to make this easy)
// A pre-base64 encoded block ID length of 4 is sufficient in this case because
// this file certainly won't have more than 99,999 blocks..
blockId := CkFileAccess__genBlockId(fac,i,4,'base64');
// Add this blockId to the list of blocks to be committed.
CkXml_NewChild2(xml,'Latest',blockId);
// Build the URI path
CkStringBuilder_Clear(uriPath);
success := CkStringBuilder_Append(uriPath,'/mycontainer/hamlet.xml?comp=block&blockId=');
success := CkStringBuilder_Append(uriPath,blockId);
contentMd5 := CkCrypt2__hashBdENC(crypt,dataBlock);
CkRest_AddHeader(rest,'Content-MD5',contentMd5);
// Upload this block..
CkStringBuilder_Clear(sbResponseBody);
success := CkRest_FullRequestBd(rest,'PUT',CkStringBuilder__getAsString(uriPath),dataBlock,sbResponseBody);
if (success = False) then
begin
Memo1.Lines.Add(CkRest__lastErrorText(rest));
Exit;
end;
// Verify that we received a 201 status code.
if (CkRest_getResponseStatusCode(rest) <> 201) then
begin
// Examine the request/response to see what happened.
Memo1.Lines.Add('response status code = ' + IntToStr(CkRest_getResponseStatusCode(rest)));
Memo1.Lines.Add('response status text = ' + CkRest__responseStatusText(rest));
Memo1.Lines.Add('response header: ' + CkRest__responseHeader(rest));
Memo1.Lines.Add('response body (if any): ' + CkStringBuilder__getAsString(sbResponseBody));
Memo1.Lines.Add('---');
Memo1.Lines.Add('LastRequestStartLine: ' + CkRest__lastRequestStartLine(rest));
Memo1.Lines.Add('LastRequestHeader: ' + CkRest__lastRequestHeader(rest));
Exit;
end;
i := i + 1;
end;
CkFileAccess_FileClose(fac);
// Now commit the blocks.
// Let's have a look at the XML that will commit the blocks:
xmlStr := CkXml__getXml(xml);
Memo1.Lines.Add(xmlStr);
// The XML will look like this:
// <?xml version="1.0" encoding="utf-8" ?>
// <BlockList>
// <Latest>MDAwMA==</Latest>
// <Latest>MDAwMQ==</Latest>
// <Latest>MDAwMg==</Latest>
// <Latest>MDAwMw==</Latest>
// <Latest>MDAwNA==</Latest>
// <Latest>MDAwNQ==</Latest>
// <Latest>MDAwNg==</Latest>
// <Latest>MDAwNw==</Latest>
// <Latest>MDAwOA==</Latest>
// <Latest>MDAwOQ==</Latest>
// <Latest>MDAxMA==</Latest>
// <Latest>MDAxMQ==</Latest>
// <Latest>MDAxMg==</Latest>
// <Latest>MDAxMw==</Latest>
// <Latest>MDAxNA==</Latest>
// <Latest>MDAxNQ==</Latest>
// <Latest>MDAxNg==</Latest>
// <Latest>MDAxNw==</Latest>
// </BlockList>
// --------------------------------------------------------------------------
// IMPORTANT: Remove the Content-MD5 header previously set in the loop above.
// --------------------------------------------------------------------------
CkRest_RemoveHeader(rest,'Content-MD5');
// Send the PUT Block List...
responseStr := CkRest__fullRequestString(rest,'PUT','/mycontainer/hamlet.xml?comp=blocklist',xmlStr);
if (CkRest_getLastMethodSuccess(rest) <> True) then
begin
Memo1.Lines.Add(CkRest__lastErrorText(rest));
Exit;
end;
// When successful, the Azure Storage service will respond with a 201 response status code,
// with no response body.
if (CkRest_getResponseStatusCode(rest) <> 201) then
begin
// Examine the request/response to see what happened.
Memo1.Lines.Add('response status code = ' + IntToStr(CkRest_getResponseStatusCode(rest)));
Memo1.Lines.Add('response status text = ' + CkRest__responseStatusText(rest));
Memo1.Lines.Add('response header: ' + CkRest__responseHeader(rest));
Memo1.Lines.Add('response body (if any): ' + responseStr);
Memo1.Lines.Add('---');
Memo1.Lines.Add('LastRequestStartLine: ' + CkRest__lastRequestStartLine(rest));
Memo1.Lines.Add('LastRequestHeader: ' + CkRest__lastRequestHeader(rest));
Exit;
end;
Memo1.Lines.Add('Success.');
CkRest_Dispose(rest);
CkAuthAzureStorage_Dispose(azAuth);
CkXml_Dispose(xml);
CkFileAccess_Dispose(fac);
CkCrypt2_Dispose(crypt);
CkStringBuilder_Dispose(sbResponseBody);
CkStringBuilder_Dispose(uriPath);
CkBinData_Dispose(dataBlock);
end;