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(Unicode C) Lower-Level REST API Methods (Google Cloud Storage)The FullRequest* methods, such as FullRequestBinary, FullRequestMultipart, FullRequestNoBody, FullRequestStream, FullRequestString, etc. are high-level REST API methods that both send the request and receive the response. It is often the case that an application needs make a REST call, but with a finer level of control. The Chilkat REST API provides this feature. An application can break a REST call into the following parts:
This example demonstrates a REST call using SendReqStringBody, ReadResonseHeader, and ReadRespBodyString.
#include <C_CkAuthGoogleW.h> #include <C_CkRestW.h> #include <C_CkJsonObjectW.h> void ChilkatSample(void) { BOOL success; HCkAuthGoogleW gAuth; HCkRestW rest; BOOL bAutoReconnect; HCkJsonObjectW jsonReqBody; HCkJsonObjectW pObjVersioning; int responseStatusCode; const wchar_t *responseBodyStr; // This example demonstrates a REST call using SendReqStringBody, ReadResonseHeader, and ReadRespBodyString. // It will create a bucket in Google Cloud Storage. // It requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. gAuth = CkAuthGoogleW_Create(); // Obtain an access token as shown in one of the following examples: // See Get Access Token using a Service Account JSON Key // See Get Access Token using a P12 File rest = CkRestW_Create(); // Connect using TLS. bAutoReconnect = TRUE; success = CkRestW_Connect(rest,L"www.googleapis.com",443,TRUE,bAutoReconnect); // Provide the authentication credentials (i.e. the access key) success = CkRestW_SetAuthGoogle(rest,gAuth); // Build the JSON request body for creating a bucket. // The only required property is the "name", but we'll add more // to make a better example.. jsonReqBody = CkJsonObjectW_Create(); success = CkJsonObjectW_AddStringAt(jsonReqBody,-1,L"name",L"chilkat-bucket-c"); success = CkJsonObjectW_AddStringAt(jsonReqBody,-1,L"kind",L"storage#bucket"); success = CkJsonObjectW_AddStringAt(jsonReqBody,-1,L"location",L"US"); success = CkJsonObjectW_AddObjectAt(jsonReqBody,-1,L"versioning"); pObjVersioning = CkJsonObjectW_ObjectOf(jsonReqBody,L"versioning"); success = CkJsonObjectW_AddBoolAt(pObjVersioning,-1,L"enabled",TRUE); CkJsonObjectW_Dispose(pObjVersioning); // Show the HTTP request body we'll be sending. wprintf(L"%s\n",CkJsonObjectW_emit(jsonReqBody)); // Add the required query parameter. // See https://cloud.google.com/storage/docs/json_api/v1/buckets/insert success = CkRestW_AddQueryParam(rest,L"project",L"chilkattest-1050"); // Add the Content-Type HTTP request header. success = CkRestW_AddHeader(rest,L"Content-Type",L"application/json; charset=UTF-8"); // Send the REST HTTP request. success = CkRestW_SendReqStringBody(rest,L"POST",L"/storage/v1/b",CkJsonObjectW_emit(jsonReqBody)); if (success != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkAuthGoogleW_Dispose(gAuth); CkRestW_Dispose(rest); CkJsonObjectW_Dispose(jsonReqBody); return; } // Read the response header. responseStatusCode = CkRestW_ReadResponseHeader(rest); if (responseStatusCode < 0) { // We were unable to receive the response header. wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkAuthGoogleW_Dispose(gAuth); CkRestW_Dispose(rest); CkJsonObjectW_Dispose(jsonReqBody); return; } if (responseStatusCode != 200) { // The response was not successful. We'll still need to receive // the response body, which may contain an error message from the server. // If the response has no body, then the method for reading the // response body can still be called. It will simply return with an empty // response body. // We can examine the response header and status text: wprintf(L"Response status text: %s\n",CkRestW_responseStatusText(rest)); wprintf(L"Response header: %s\n",CkRestW_responseHeader(rest)); } // Read the response body. In this case we're expecting it to be JSON.. responseBodyStr = CkRestW_readRespBodyString(rest); if (CkRestW_getLastMethodSuccess(rest) != TRUE) { // We were unable to receive the response body. // Note: If the response did not include a body (such as for cases where // the Content-Length header is 0, or if the response status code implicitly // indicates no body, then ReadRespBodyString returns cktrue, and the // responseBodyString will be an empty string. wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkAuthGoogleW_Dispose(gAuth); CkRestW_Dispose(rest); CkJsonObjectW_Dispose(jsonReqBody); return; } // Show the JSON response. wprintf(L"Json Response: %s\n",responseBodyStr); CkAuthGoogleW_Dispose(gAuth); CkRestW_Dispose(rest); CkJsonObjectW_Dispose(jsonReqBody); } |
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