62 строки
2.4 KiB
Plaintext
62 строки
2.4 KiB
Plaintext
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How To Use Libcurl In Your Program
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Interfaces
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libcurl currently offers two different interfaces to the URL transfer
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engine. They can be seen as one low-level and one high-level, in the sense
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that the low-level one will allow you to deal with a lot more details but on
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the other hand not offer as many fancy features (such as Location:
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following). The high-level interface is supposed to be a built-in
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implementation of the low-level interface. You will not be able to mix
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function calls from the different layers.
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As we currently ONLY support the high-level interface, the so called easy
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interface, I will not attempt to describe any low-level functions at this
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point.
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Function descriptions
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The interface is meant to be very simple for very simple
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implementations. Thus, we have minimized the number of entries.
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The Easy Interface
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When using the easy interface, you init your easy-session and get a handle,
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which you use as input to the following interface functions you use.
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You continue by setting all the options you want in the upcoming transfer,
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most important among them is the URL itself. You might want to set some
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callbacks as well that will be called from the library when data is available
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etc.
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When all is setup, you tell libcurl to perform the transfer. It will then do
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the entire operation and won't return until it is done or failed.
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After the transfer has been made, you cleanup the easy-session's handle and
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libcurl is entirely off the hook!
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curl_easy_init()
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curl_easy_setopt()
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curl_easy_perform()
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curl_easy_cleanup()
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While the above four functions are the main functions to use in the easy
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interface, there is a series of helpful functions to use. They are:
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curl_version() - displays the libcurl version
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curl_getdate() - converts a date string to time_t
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curl_getenv() - portable environment variable reader
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curl_formparse() - helps building a HTTP form POST
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curl_slist_append() - builds a linked list
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curl_slist_free_all() - frees a whole curl_slist
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Read the separate man pages for these functions for details!
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