学习日记 » libcurl https://www.softwareace.cn 时刻想着为自己的产品多做一些对他好的事情 Fri, 20 Mar 2026 06:58:28 +0000 zh-CN hourly 1 curl_easy_perform 返回值说明 https://www.softwareace.cn/?p=529 https://www.softwareace.cn/?p=529#comments Mon, 19 Aug 2013 09:42:39 +0000 http://www.softwareace.cn/?p=529 response=curl_easy_perform(curl);
response返回的状态值
CURLE_OK: printf(“send ok!\n”);
CURLE_HTTP_POST_ERROR: printf(“post error!\n”);
CURLE_COULDNT_CONNECT: printf(“cannot connect to server\n”);

CURLE_OK = 0, 0: no error
CURLE_UNSUPPORTED_PROTOCOL, 1: unsupported protocol
CURLE_FAILED_INIT, 2: failed init
CURLE_URL_MALFORMAT, 3: URL using bad/illegal format or missing URL
CURLE_URL_MALFORMAT_USER, 4: unknown error
CURLE_COULDNT_RESOLVE_PROXY, 5: couldn’t resolve proxy name
CURLE_COULDNT_RESOLVE_HOST, 6: couldn’t resolve host name
CURLE_COULDNT_CONNECT, 7: couldn’t connect to server
CURLE_FTP_WEIRD_SERVER_REPLY, 8: FTP: weird server reply
CURLE_FTP_ACCESS_DENIED,
CURLE_FTP_USER_PASSWORD_INCORRECT, 10: unknown error
CURLE_FTP_WEIRD_PASS_REPLY, 11: FTP: unknown PASS reply
CURLE_FTP_WEIRD_USER_REPLY, 12: FTP: unknown USER reply
CURLE_FTP_WEIRD_PASV_REPLY, 13: FTP: unknown PASV reply
CURLE_FTP_WEIRD_227_FORMAT, 14: FTP: unknown 227 response format
CURLE_FTP_CANT_GET_HOST, 15: FTP: can’t figure out the host in the PASV response
CURLE_FTP_CANT_RECONNECT, 16: FTP: can’t connect to server the response code is unknown
CURLE_FTP_COULDNT_SET_BINARY, 17: FTP: couldn’t set binary mode
CURLE_PARTIAL_FILE, 18: Transferred a partial file
CURLE_FTP_COULDNT_RETR_FILE, 19: FTP: couldn’t retrieve (RETR failed) the specified file
CURLE_FTP_WRITE_ERROR, 20: FTP: the post-transfer acknowledge response was not OK
CURLE_FTP_QUOTE_ERROR, 21: FTP: a quote command returned error
CURLE_HTTP_RETURNED_ERROR, 22: HTTP response code said error
CURLE_WRITE_ERROR, 23: failed writing received data to disk/application
CURLE_MALFORMAT_USER, 24: unknown error
CURLE_UPLOAD_FAILED, 25: upload failed (at start/before it took off)
CURLE_READ_ERROR, 26: failed to open/read local data from file/application
CURLE_OUT_OF_MEMORY, 27: out of memory

CURLE_OPERATION_TIMEOUTED, 28: a timeout was reached
CURLE_FTP_COULDNT_SET_ASCII, 29: FTP could not set ASCII mode (TYPE A)
CURLE_FTP_PORT_FAILED, 30: FTP command PORT failed
CURLE_FTP_COULDNT_USE_REST, 31: FTP command REST failed
CURLE_FTP_COULDNT_GET_SIZE, 32: FTP command SIZE failed
CURLE_HTTP_RANGE_ERROR, 33: a range was requested but the server did not deliver it
CURLE_HTTP_POST_ERROR, 34: internal problem setting up the POST
CURLE_SSL_CONNECT_ERROR, 35: SSL connect error
CURLE_BAD_DOWNLOAD_RESUME, 36: couldn’t resume download
CURLE_FILE_COULDNT_READ_FILE, 37: couldn’t read a file:// file
CURLE_LDAP_CANNOT_BIND, 38: LDAP: cannot bind
CURLE_LDAP_SEARCH_FAILED, 39: LDAP: search failed
CURLE_LIBRARY_NOT_FOUND, 40: a required shared library was not found

]]> https://www.softwareace.cn/?feed=rss2&p=529 0 curl_easy_perform crash https://www.softwareace.cn/?p=528 https://www.softwareace.cn/?p=528#comments Mon, 19 Aug 2013 04:37:23 +0000 http://www.softwareace.cn/?p=528 把 curl_easy_setopt 中的函数指针 都改为 static

 

]]> https://www.softwareace.cn/?feed=rss2&p=528 0 curl_easy_setopt函数介绍 https://www.softwareace.cn/?p=527 https://www.softwareace.cn/?p=527#comments Mon, 19 Aug 2013 02:17:00 +0000 http://www.softwareace.cn/?p=527 本节主要介绍curl_easy_setopt中跟http相关的参数。注意本节的阐述都是以libcurl作为主体，其它为客体来阐述的。
1.     CURLOPT_URL
设置访问URL
2.       CURLOPT_WRITEFUNCTION，CURLOPT_WRITEDATA
回调函数原型为：size_t function( void *ptr, size_t size, size_t nmemb, void *stream); 函数将在libcurl接收到数据后被调用，因此函数多做数据保存的功能，如处理下载文件。CURLOPT_WRITEDATA 用于表明CURLOPT_WRITEFUNCTION函数中的stream指针的来源。
3.      CURLOPT_HEADERFUNCTION，CURLOPT_HEADERDATA
回调函数原型为 size_t function( void *ptr, size_t size,size_t nmemb, void *stream); libcurl一旦接收到http 头部数据后将调用该函数。CURLOPT_WRITEDATA 传递指针给libcurl，该指针表明CURLOPT_HEADERFUNCTION 函数的stream指针的来源。
4.       CURLOPT_READFUNCTION CURLOPT_READDATA
libCurl需要读取数据传递给远程主机时将调用CURLOPT_READFUNCTION指定的函数，函数原型是：size_t function(void *ptr, size_t size, size_t nmemb,void *stream). CURLOPT_READDATA 表明CURLOPT_READFUNCTION函数原型中的stream指针来源。
5.       CURLOPT_NOPROGRESS，CURLOPT_PROGRESSFUNCTION，CURLOPT_PROGRESSDATA
跟数据传输进度相关的参数。CURLOPT_PROGRESSFUNCTION 指定的函数正常情况下每秒被libcurl调用一次，为了使CURLOPT_PROGRESSFUNCTION被调用，CURLOPT_NOPROGRESS必须被设置为false，CURLOPT_PROGRESSDATA指定的参数将作为CURLOPT_PROGRESSFUNCTION指定函数的第一个参数
6.       CURLOPT_TIMEOUT，CURLOPT_CONNECTIONTIMEOUT:
CURLOPT_TIMEOUT 由于设置传输时间，CURLOPT_CONNECTIONTIMEOUT 设置连接等待时间
7.       CURLOPT_FOLLOWLOCATION
设置重定位URL
CURLOPT_RANGE: CURLOPT_RESUME_FROM:
断点续传相关设置。CURLOPT_RANGE 指定char *参数传递给libcurl，用于指明http域的RANGE头域，例如：
表示头500个字节：bytes=0-499
表示第二个500字节：bytes=500-999
表示最后500个字节：bytes=-500
表示500字节以后的范围：bytes=500-
第一个和最后一个字节：bytes=0-0,-1
同时指定几个范围：bytes=500-600,601-999
CURLOPT_RESUME_FROM 传递一个long参数给libcurl，指定你希望开始传递的
偏移量。

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