libcurl. curl_easy_perform. perform a blocking file transfer

#include

CURLcode curl_easy_perform(CURL *easy_handle);

 

Description

Invoke this function after curl_easy_init and all the curl_easy_setopt calls are made, and will perform the transfer as described in the options. It must be called with the same easy_handle as input as the curl_easy_init call returned.

curl_easy_perform performs the entire request in a blocking manner and returns when done, or if it failed. For non-blocking behavior, see curl_multi_perform.

You can do any amount of calls to curl_easy_perform while using the same easy_handle. If you intend to transfer more than one file, you are even encouraged to do so. libcurl will then attempt to re-use the same connection for the following transfers, thus making the operations faster, less CPU intense and using less network resources. Just note that you will have to use curl_easy_setopt between the invokes to set options for the following curl_easy_perform.

You must never call this function simultaneously from two places using the same easy_handle. Let the function return first before invoking it another time. If you want parallel transfers, you must use several curl easy_handles.

While the easy_handle is added to a multi handle, it cannot be used by curl_easy_perform.

 

Return Value

 

CURLE_OK (0) means everything was ok, non-zero means an error occurred as defines - see libcurl-errors. If the CURLOPT_ERRORBUFFER was set with curl_easy_setopt there will be a readable error message in the error buffer when non-zero is returned.

 

 

Example

 

CURL *curl = curl_easy_init();
if(curl) {
  CURLcode res;
  curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
  res = curl_easy_perform(curl);
  curl_easy_cleanup(curl);
}

 

Error  

 - curl_easy_perform 실행결과 에러중 흔한것들. 

 

CURLE_WRITE_ERROR (23)

An error occurred when writing received data to a local file, or an error was returned to libcurl from a write callback.

Failed writing received data to disk/application

- 사례 참조 : https://stackoverflow.com/questions/46005906/libcurl-error-failed-writing-received-data-to-disk-application

 

 

 

 

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첫 등록 : 2020.05.05

최종 수정 : 

단축 주소 : https://igotit.tistory.com/2537

 

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