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(Unicode C) Azure Blob - Get Tags (Check if Blob Exists)See more Azure Cloud Storage ExamplesGets the user-defined tags for a specified blob. This can also be used as a way to check to see if a blob exists. For more information, see https://learn.microsoft.com/en-us/rest/api/storageservices/get-blob-tags
#include <C_CkRestW.h> #include <C_CkAuthAzureStorageW.h> #include <C_CkStringBuilderW.h> #include <C_CkXmlW.h> void ChilkatSample(void) { HCkRestW rest; BOOL bTls; int port; BOOL bAutoReconnect; BOOL success; HCkAuthAzureStorageW azAuth; HCkStringBuilderW sb; HCkXmlW xml; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. rest = CkRestW_Create(); // Connect to the Azure Storage Blob Service bTls = TRUE; port = 443; bAutoReconnect = TRUE; // In this example, the storage account name is "chilkat". success = CkRestW_Connect(rest,L"chilkat.blob.core.windows.net",port,bTls,bAutoReconnect); if (success != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); return; } // Provide Azure Cloud credentials for the REST call. azAuth = CkAuthAzureStorageW_Create(); CkAuthAzureStorageW_putAccessKey(azAuth,L"AZURE_ACCESS_KEY"); // The account name used here should match the 1st part of the domain passed in the call to Connect (above). CkAuthAzureStorageW_putAccount(azAuth,L"chilkat"); CkAuthAzureStorageW_putScheme(azAuth,L"SharedKey"); CkAuthAzureStorageW_putService(azAuth,L"Blob"); // This causes the "x-ms-version: 2021-08-06" header to be automatically added. CkAuthAzureStorageW_putXMsVersion(azAuth,L"2021-08-06"); success = CkRestW_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. // The Azure blob container is "test", the file is "helloWorld.txt" // Add "?comp=tags" to get the user-defined tags instead of the actual blob content. sb = CkStringBuilderW_Create(); success = CkRestW_FullRequestNoBodySb(rest,L"GET",L"/test/helloWorldajdfadf.txt?comp=tags",sb); if (success == FALSE) { // Examine the request/response to see what happened. wprintf(L"response status code = %d\n",CkRestW_getResponseStatusCode(rest)); wprintf(L"response status text = %s\n",CkRestW_responseStatusText(rest)); wprintf(L"response header: %s\n",CkRestW_responseHeader(rest)); wprintf(L"---\n"); wprintf(L"LastRequestStartLine: %s\n",CkRestW_lastRequestStartLine(rest)); wprintf(L"LastRequestHeader: %s\n",CkRestW_lastRequestHeader(rest)); CkRestW_Dispose(rest); CkAuthAzureStorageW_Dispose(azAuth); CkStringBuilderW_Dispose(sb); return; } // A typical blob with no tags will return this: // <?xml version="1.0" encoding="utf-8"?> // <Tags><TagSet/></Tags> // If the blob does not exist, you get this: // <?xml version="1.0" encoding="utf-8"?> // <Error> // <Code>BlobNotFound</Code> // <Message>The specified blob does not exist. // RequestId:fcfefdd9-301e-001a-2135-3a23d2000000 // Time:2023-02-06T14:17:00.7805577Z // </Message> // </Error> wprintf(L"%s\n",CkStringBuilderW_getAsString(sb)); // To see if we got Tags or an Error, then examine the XML. xml = CkXmlW_Create(); CkXmlW_LoadSb(xml,sb,TRUE); // Examine the tag.. if (CkXmlW_TagEquals(xml,L"Tags") == TRUE) { wprintf(L"Blob exists!\n"); } else { if (CkXmlW_ChildContentMatches(xml,L"Code",L"BlobNotFound",TRUE) == TRUE) { wprintf(L"Blob does not exist.\n"); } else { wprintf(L"Some other error...\n"); } } wprintf(L"Success.\n"); CkRestW_Dispose(rest); CkAuthAzureStorageW_Dispose(azAuth); CkStringBuilderW_Dispose(sb); CkXmlW_Dispose(xml); } |
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