C
C
Azure File Service: Upload Large File
See more Azure Cloud Storage Examples
Sample 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.Chilkat C Downloads
#include <C_CkRest.h>
#include <C_CkFileAccess.h>
#include <C_CkAuthAzureStorage.h>
#include <C_CkStringBuilder.h>
#include <C_CkBinData.h>
void ChilkatSample(void)
{
BOOL success;
HCkRest rest;
BOOL bTls;
int port;
BOOL bAutoReconnect;
const char *localFilePath;
HCkFileAccess fac;
int szLocalFile;
HCkAuthAzureStorage azAuth;
HCkStringBuilder sbFileSize;
const char *responseStr;
HCkStringBuilder sbRange;
HCkStringBuilder sbResponseBody;
HCkBinData bdFileData;
int numBytesLeft;
int curIndex;
int chunkSize;
success = FALSE;
// 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.
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.file.core.windows.net",port,bTls,bAutoReconnect);
if (success != TRUE) {
printf("%s\n",CkRest_lastErrorText(rest));
CkRest_Dispose(rest);
return;
}
// This example will upload a larger file.
localFilePath = "qa_data/zips/somethingBig.zip";
fac = CkFileAccess_Create();
// 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 = CkFileAccess_FileSize(fac,localFilePath);
if (szLocalFile < 0) {
printf("%s\n",CkFileAccess_lastErrorText(fac));
CkRest_Dispose(rest);
CkFileAccess_Dispose(fac);
return;
}
// Provide Azure Cloud credentials for the REST calls.
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,"File");
// 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: x-ms-date, Authorization. These headers
// are automatically set by Chilkat.
// However, a few additional headers are required for the "Create File" operation:
CkRest_AddHeader(rest,"x-ms-type","file");
// This required header specifies the final size of the file (or the maximum size it can be).
sbFileSize = CkStringBuilder_Create();
CkStringBuilder_AppendInt(sbFileSize,szLocalFile);
CkRest_AddHeader(rest,"x-ms-content-length",CkStringBuilder_getAsString(sbFileSize));
// 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 = CkRest_fullRequestNoBody(rest,"PUT","/pip/somethingBig.zip");
if (CkRest_getLastMethodSuccess(rest) != TRUE) {
printf("%s\n",CkRest_lastErrorText(rest));
CkRest_Dispose(rest);
CkFileAccess_Dispose(fac);
CkAuthAzureStorage_Dispose(azAuth);
CkStringBuilder_Dispose(sbFileSize);
return;
}
// 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 (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);
CkFileAccess_Dispose(fac);
CkAuthAzureStorage_Dispose(azAuth);
CkStringBuilder_Dispose(sbFileSize);
return;
}
printf("Successfully created somethingBig.zip\n");
// --------------------------------------------------------------------------------
// Upload the file data...
// Make sure the headers from the "Create File" operation are removed.
CkRest_ClearAllHeaders(rest);
// The x-ms-write header is required for each "Put Range" request.
CkRest_AddHeader(rest,"x-ms-write","update");
sbRange = CkStringBuilder_Create();
sbResponseBody = CkStringBuilder_Create();
bdFileData = CkBinData_Create();
// Open the file. We'll be reading and uploading in chunks..
success = CkFileAccess_OpenForRead(fac,localFilePath);
if (success != TRUE) {
printf("%s\n",CkFileAccess_lastErrorText(fac));
CkRest_Dispose(rest);
CkFileAccess_Dispose(fac);
CkAuthAzureStorage_Dispose(azAuth);
CkStringBuilder_Dispose(sbFileSize);
CkStringBuilder_Dispose(sbRange);
CkStringBuilder_Dispose(sbResponseBody);
CkBinData_Dispose(bdFileData);
return;
}
numBytesLeft = szLocalFile;
curIndex = 0;
while (numBytesLeft > 0) {
chunkSize = numBytesLeft;
// Azure allows for 4MB max chunks (4 x 1024 x 1024 = 4194304)
if (chunkSize > 4194304) {
chunkSize = 4194304;
}
// 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
CkStringBuilder_Clear(sbRange);
CkStringBuilder_Append(sbRange,"bytes=");
CkStringBuilder_AppendInt(sbRange,curIndex);
CkStringBuilder_Append(sbRange,"-");
CkStringBuilder_AppendInt(sbRange,curIndex + chunkSize - 1);
// This replaces the header if it already exists..
CkRest_AddHeader(rest,"x-ms-range",CkStringBuilder_getAsString(sbRange));
// Read the next chunk from the local file.
CkBinData_Clear(bdFileData);
success = CkFileAccess_FileReadBd(fac,chunkSize,bdFileData);
success = CkRest_FullRequestBd(rest,"PUT","/pip/somethingBig.zip?comp=range",bdFileData,sbResponseBody);
if (success != TRUE) {
// This would indicate a failure where no response was received.
printf("%s\n",CkRest_lastErrorText(rest));
CkRest_Dispose(rest);
CkFileAccess_Dispose(fac);
CkAuthAzureStorage_Dispose(azAuth);
CkStringBuilder_Dispose(sbFileSize);
CkStringBuilder_Dispose(sbRange);
CkStringBuilder_Dispose(sbResponseBody);
CkBinData_Dispose(bdFileData);
return;
}
// A 201 response indicates the chunk was uploaded.
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);
CkFileAccess_Dispose(fac);
CkAuthAzureStorage_Dispose(azAuth);
CkStringBuilder_Dispose(sbFileSize);
CkStringBuilder_Dispose(sbRange);
CkStringBuilder_Dispose(sbResponseBody);
CkBinData_Dispose(bdFileData);
return;
}
printf("Uploaded chunk from %d to %d\n",curIndex,curIndex + chunkSize - 1);
curIndex = curIndex + chunkSize;
numBytesLeft = numBytesLeft - chunkSize;
}
CkFileAccess_FileClose(fac);
printf("success.\n");
CkRest_Dispose(rest);
CkFileAccess_Dispose(fac);
CkAuthAzureStorage_Dispose(azAuth);
CkStringBuilder_Dispose(sbFileSize);
CkStringBuilder_Dispose(sbRange);
CkStringBuilder_Dispose(sbResponseBody);
CkBinData_Dispose(bdFileData);
}