Unicode C++
Unicode C++
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 Unicode C++ Downloads
#include <CkRestW.h>
#include <CkAuthAzureStorageW.h>
#include <CkXmlW.h>
#include <CkFileAccessW.h>
#include <CkCrypt2W.h>
#include <CkStringBuilderW.h>
#include <CkBinDataW.h>
void ChilkatSample(void)
{
bool 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.
CkRestW rest;
// Connect to the Azure Storage Blob Service
bool bTls = true;
int port = 443;
bool bAutoReconnect = true;
// In this example, the storage account name is "chilkat".
success = rest.Connect(L"chilkat.blob.core.windows.net",port,bTls,bAutoReconnect);
if (success != true) {
wprintf(L"%s\n",rest.lastErrorText());
return;
}
// Provide Azure Cloud credentials for the REST call.
CkAuthAzureStorageW azAuth;
azAuth.put_AccessKey(L"AZURE_ACCESS_KEY");
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
azAuth.put_Account(L"chilkat");
azAuth.put_Scheme(L"SharedKey");
azAuth.put_Service(L"Blob");
// This causes the "x-ms-version: 2021-08-06" header to be automatically added.
azAuth.put_XMsVersion(L"2021-08-06");
success = rest.SetAuthAzureStorage(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..
CkXmlW xml;
xml.put_Tag(L"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
CkFileAccessW fac;
success = fac.OpenForRead(L"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...)
int blockSize = 16384;
// How many 16K blocks? (Including 1 for the last partial block)
int numBlocks = fac.GetNumBlocks(blockSize);
CkCrypt2W crypt;
crypt.put_HashAlgorithm(L"md5");
CkStringBuilderW sbResponseBody;
CkStringBuilderW uriPath;
const wchar_t *blockId = 0;
CkBinDataW dataBlock;
const wchar_t *contentMd5 = 0;
int i = 0;
while (i < numBlocks) {
dataBlock.Clear();
success = fac.ReadBlockBd(i,blockSize,dataBlock);
if (success == false) {
wprintf(L"%s\n",fac.lastErrorText());
return;
}
// 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 = fac.genBlockId(i,4,L"base64");
// Add this blockId to the list of blocks to be committed.
xml.NewChild2(L"Latest",blockId);
// Build the URI path
uriPath.Clear();
success = uriPath.Append(L"/mycontainer/hamlet.xml?comp=block&blockId=");
success = uriPath.Append(blockId);
contentMd5 = crypt.hashBdENC(dataBlock);
rest.AddHeader(L"Content-MD5",contentMd5);
// Upload this block..
sbResponseBody.Clear();
success = rest.FullRequestBd(L"PUT",uriPath.getAsString(),dataBlock,sbResponseBody);
if (success == false) {
wprintf(L"%s\n",rest.lastErrorText());
return;
}
// Verify that we received a 201 status code.
if (rest.get_ResponseStatusCode() != 201) {
// Examine the request/response to see what happened.
wprintf(L"response status code = %d\n",rest.get_ResponseStatusCode());
wprintf(L"response status text = %s\n",rest.responseStatusText());
wprintf(L"response header: %s\n",rest.responseHeader());
wprintf(L"response body (if any): %s\n",sbResponseBody.getAsString());
wprintf(L"---\n");
wprintf(L"LastRequestStartLine: %s\n",rest.lastRequestStartLine());
wprintf(L"LastRequestHeader: %s\n",rest.lastRequestHeader());
return;
}
i = i + 1;
}
fac.FileClose();
// Now commit the blocks.
// Let's have a look at the XML that will commit the blocks:
const wchar_t *xmlStr = xml.getXml();
wprintf(L"%s\n",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.
// --------------------------------------------------------------------------
rest.RemoveHeader(L"Content-MD5");
// Send the PUT Block List...
const wchar_t *responseStr = rest.fullRequestString(L"PUT",L"/mycontainer/hamlet.xml?comp=blocklist",xmlStr);
if (rest.get_LastMethodSuccess() != true) {
wprintf(L"%s\n",rest.lastErrorText());
return;
}
// When successful, the Azure Storage service will respond with a 201 response status code,
// with no response body.
if (rest.get_ResponseStatusCode() != 201) {
// Examine the request/response to see what happened.
wprintf(L"response status code = %d\n",rest.get_ResponseStatusCode());
wprintf(L"response status text = %s\n",rest.responseStatusText());
wprintf(L"response header: %s\n",rest.responseHeader());
wprintf(L"response body (if any): %s\n",responseStr);
wprintf(L"---\n");
wprintf(L"LastRequestStartLine: %s\n",rest.lastRequestStartLine());
wprintf(L"LastRequestHeader: %s\n",rest.lastRequestHeader());
return;
}
wprintf(L"Success.\n");
}