C
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 C Downloads
#include <C_CkRest.h>
#include <C_CkAuthAzureStorage.h>
#include <C_CkXml.h>
#include <C_CkFileAccess.h>
#include <C_CkCrypt2.h>
#include <C_CkStringBuilder.h>
#include <C_CkBinData.h>
void ChilkatSample(void)
{
BOOL success;
HCkRest rest;
BOOL bTls;
int port;
BOOL bAutoReconnect;
HCkAuthAzureStorage azAuth;
HCkXml xml;
HCkFileAccess fac;
int blockSize;
int numBlocks;
HCkCrypt2 crypt;
HCkStringBuilder sbResponseBody;
HCkStringBuilder uriPath;
const char *blockId;
HCkBinData dataBlock;
const char *contentMd5;
int i;
const char *xmlStr;
const char *responseStr;
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) {
printf("%s\n",CkRest_lastErrorText(rest));
CkRest_Dispose(rest);
return;
}
// 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) {
CkBinData_Clear(dataBlock);
success = CkFileAccess_ReadBlockBd(fac,i,blockSize,dataBlock);
if (success == FALSE) {
printf("%s\n",CkFileAccess_lastErrorText(fac));
CkRest_Dispose(rest);
CkAuthAzureStorage_Dispose(azAuth);
CkXml_Dispose(xml);
CkFileAccess_Dispose(fac);
CkCrypt2_Dispose(crypt);
CkStringBuilder_Dispose(sbResponseBody);
CkStringBuilder_Dispose(uriPath);
CkBinData_Dispose(dataBlock);
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 = 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) {
printf("%s\n",CkRest_lastErrorText(rest));
CkRest_Dispose(rest);
CkAuthAzureStorage_Dispose(azAuth);
CkXml_Dispose(xml);
CkFileAccess_Dispose(fac);
CkCrypt2_Dispose(crypt);
CkStringBuilder_Dispose(sbResponseBody);
CkStringBuilder_Dispose(uriPath);
CkBinData_Dispose(dataBlock);
return;
}
// Verify that we received a 201 status code.
if (CkRest_getResponseStatusCode(rest) != 201) {
// Examine the request/response to see what happened.
printf("response status code = %d\n",CkRest_getResponseStatusCode(rest));
printf("response status text = %s\n",CkRest_responseStatusText(rest));
printf("response header: %s\n",CkRest_responseHeader(rest));
printf("response body (if any): %s\n",CkStringBuilder_getAsString(sbResponseBody));
printf("---\n");
printf("LastRequestStartLine: %s\n",CkRest_lastRequestStartLine(rest));
printf("LastRequestHeader: %s\n",CkRest_lastRequestHeader(rest));
CkRest_Dispose(rest);
CkAuthAzureStorage_Dispose(azAuth);
CkXml_Dispose(xml);
CkFileAccess_Dispose(fac);
CkCrypt2_Dispose(crypt);
CkStringBuilder_Dispose(sbResponseBody);
CkStringBuilder_Dispose(uriPath);
CkBinData_Dispose(dataBlock);
return;
}
i = i + 1;
}
CkFileAccess_FileClose(fac);
// Now commit the blocks.
// Let's have a look at the XML that will commit the blocks:
xmlStr = CkXml_getXml(xml);
printf("%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.
// --------------------------------------------------------------------------
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) {
printf("%s\n",CkRest_lastErrorText(rest));
CkRest_Dispose(rest);
CkAuthAzureStorage_Dispose(azAuth);
CkXml_Dispose(xml);
CkFileAccess_Dispose(fac);
CkCrypt2_Dispose(crypt);
CkStringBuilder_Dispose(sbResponseBody);
CkStringBuilder_Dispose(uriPath);
CkBinData_Dispose(dataBlock);
return;
}
// When successful, the Azure Storage service will respond with a 201 response status code,
// with no response body.
if (CkRest_getResponseStatusCode(rest) != 201) {
// Examine the request/response to see what happened.
printf("response status code = %d\n",CkRest_getResponseStatusCode(rest));
printf("response status text = %s\n",CkRest_responseStatusText(rest));
printf("response header: %s\n",CkRest_responseHeader(rest));
printf("response body (if any): %s\n",responseStr);
printf("---\n");
printf("LastRequestStartLine: %s\n",CkRest_lastRequestStartLine(rest));
printf("LastRequestHeader: %s\n",CkRest_lastRequestHeader(rest));
CkRest_Dispose(rest);
CkAuthAzureStorage_Dispose(azAuth);
CkXml_Dispose(xml);
CkFileAccess_Dispose(fac);
CkCrypt2_Dispose(crypt);
CkStringBuilder_Dispose(sbResponseBody);
CkStringBuilder_Dispose(uriPath);
CkBinData_Dispose(dataBlock);
return;
}
printf("Success.\n");
CkRest_Dispose(rest);
CkAuthAzureStorage_Dispose(azAuth);
CkXml_Dispose(xml);
CkFileAccess_Dispose(fac);
CkCrypt2_Dispose(crypt);
CkStringBuilder_Dispose(sbResponseBody);
CkStringBuilder_Dispose(uriPath);
CkBinData_Dispose(dataBlock);
}