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I prefer CURLOPT_WRITEDATA before CURLOPT_FILE

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Daniel Stenberg 2004-07-02 14:00:49 +00:00
parent e4caa98901
commit 5a70e42428

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@ -188,24 +188,27 @@ similar to this:
You can control what data your function get in the forth argument by setting
another property:
curl_easy_setopt(easyhandle, CURLOPT_FILE, &internal_struct);
curl_easy_setopt(easyhandle, CURLOPT_WRITEDATA, &internal_struct);
Using that property, you can easily pass local data between your application
and the function that gets invoked by libcurl. libcurl itself won't touch the
data you pass with CURLOPT_FILE.
data you pass with CURLOPT_WRITEDATA.
libcurl offers its own default internal callback that'll take care of the data
if you don't set the callback with CURLOPT_WRITEFUNCTION. It will then simply
output the received data to stdout. You can have the default callback write
the data to a different file handle by passing a 'FILE *' to a file opened for
writing with the CURLOPT_FILE option.
writing with the CURLOPT_WRITEDATA option.
Now, we need to take a step back and have a deep breath. Here's one of those
rare platform-dependent nitpicks. Did you spot it? On some platforms[2],
libcurl won't be able to operate on files opened by the program. Thus, if you
use the default callback and pass in a an open file with CURLOPT_FILE, it will
crash. You should therefore avoid this to make your program run fine virtually
everywhere.
use the default callback and pass in a an open file with CURLOPT_WRITEDATA, it
will crash. You should therefore avoid this to make your program run fine
virtually everywhere.
(CURLOPT_WRITEDATA was formerly known as CURLOPT_FILE. Both names still work
and do the same thing).
There are of course many more options you can set, and we'll get back to a few
of them later. Let's instead continue to the actual transfer: