curl_easy_perform返回值说明

一、curl_easy_perform返回值说明

CURLcode curl_easy_perform(CURL *curl);

CURLcode返回值说明：

/* All possible error codes from all sorts of curl functions. Future versionsmay return other values, stay prepared.Always add new return codes last. Never *EVER* remove any. The returncodes must remain the same!*/typedef enum {CURLE_OK = 0,CURLE_UNSUPPORTED_PROTOCOL,    /* 1 */CURLE_FAILED_INIT,             /* 2 */CURLE_URL_MALFORMAT,           /* 3 */CURLE_NOT_BUILT_IN,            /* 4 - [was obsoleted in August 2007 for7.17.0, reused in April 2011 for 7.21.5] */CURLE_COULDNT_RESOLVE_PROXY,   /* 5 */CURLE_COULDNT_RESOLVE_HOST,    /* 6 */CURLE_COULDNT_CONNECT,         /* 7 */CURLE_WEIRD_SERVER_REPLY,      /* 8 */CURLE_REMOTE_ACCESS_DENIED,    /* 9 a service was denied by the serverdue to lack of access - when login failsthis is not returned. */CURLE_FTP_ACCEPT_FAILED,       /* 10 - [was obsoleted in April 2006 for7.15.4, reused in Dec 2011 for 7.24.0]*/CURLE_FTP_WEIRD_PASS_REPLY,    /* 11 */CURLE_FTP_ACCEPT_TIMEOUT,      /* 12 - timeout occurred accepting server[was obsoleted in August 2007 for 7.17.0,reused in Dec 2011 for 7.24.0]*/CURLE_FTP_WEIRD_PASV_REPLY,    /* 13 */CURLE_FTP_WEIRD_227_FORMAT,    /* 14 */CURLE_FTP_CANT_GET_HOST,       /* 15 */CURLE_HTTP2,                   /* 16 - A problem in the http2 framing layer.[was obsoleted in August 2007 for 7.17.0,reused in July 2014 for 7.38.0] */CURLE_FTP_COULDNT_SET_TYPE,    /* 17 */CURLE_PARTIAL_FILE,            /* 18 */CURLE_FTP_COULDNT_RETR_FILE,   /* 19 */CURLE_OBSOLETE20,              /* 20 - NOT USED */CURLE_QUOTE_ERROR,             /* 21 - quote command failure */CURLE_HTTP_RETURNED_ERROR,     /* 22 */CURLE_WRITE_ERROR,             /* 23 */CURLE_OBSOLETE24,              /* 24 - NOT USED */CURLE_UPLOAD_FAILED,           /* 25 - failed upload "command" */CURLE_READ_ERROR,              /* 26 - couldn't open/read from file */CURLE_OUT_OF_MEMORY,           /* 27 *//* Note: CURLE_OUT_OF_MEMORY may sometimes indicate a conversion errorinstead of a memory allocation error if CURL_DOES_CONVERSIONSis defined*/CURLE_OPERATION_TIMEDOUT,      /* 28 - the timeout time was reached */CURLE_OBSOLETE29,              /* 29 - NOT USED */CURLE_FTP_PORT_FAILED,         /* 30 - FTP PORT operation failed */CURLE_FTP_COULDNT_USE_REST,    /* 31 - the REST command failed */CURLE_OBSOLETE32,              /* 32 - NOT USED */CURLE_RANGE_ERROR,             /* 33 - RANGE "command" didn't work */CURLE_HTTP_POST_ERROR,         /* 34 */CURLE_SSL_CONNECT_ERROR,       /* 35 - wrong when connecting with SSL */CURLE_BAD_DOWNLOAD_RESUME,     /* 36 - couldn't resume download */CURLE_FILE_COULDNT_READ_FILE,  /* 37 */CURLE_LDAP_CANNOT_BIND,        /* 38 */CURLE_LDAP_SEARCH_FAILED,      /* 39 */CURLE_OBSOLETE40,              /* 40 - NOT USED */CURLE_FUNCTION_NOT_FOUND,      /* 41 - NOT USED starting with 7.53.0 */CURLE_ABORTED_BY_CALLBACK,     /* 42 */CURLE_BAD_FUNCTION_ARGUMENT,   /* 43 */CURLE_OBSOLETE44,              /* 44 - NOT USED */CURLE_INTERFACE_FAILED,        /* 45 - CURLOPT_INTERFACE failed */CURLE_OBSOLETE46,              /* 46 - NOT USED */CURLE_TOO_MANY_REDIRECTS,      /* 47 - catch endless re-direct loops */CURLE_UNKNOWN_OPTION,          /* 48 - User specified an unknown option */CURLE_TELNET_OPTION_SYNTAX,    /* 49 - Malformed telnet option */CURLE_OBSOLETE50,              /* 50 - NOT USED */CURLE_PEER_FAILED_VERIFICATION, /* 51 - peer's certificate or fingerprintwasn't verified fine */CURLE_GOT_NOTHING,             /* 52 - when this is a specific error */CURLE_SSL_ENGINE_NOTFOUND,     /* 53 - SSL crypto engine not found */CURLE_SSL_ENGINE_SETFAILED,    /* 54 - can not set SSL crypto engine asdefault */CURLE_SEND_ERROR,              /* 55 - failed sending network data */CURLE_RECV_ERROR,              /* 56 - failure in receiving network data */CURLE_OBSOLETE57,              /* 57 - NOT IN USE */CURLE_SSL_CERTPROBLEM,         /* 58 - problem with the local certificate */CURLE_SSL_CIPHER,              /* 59 - couldn't use specified cipher */CURLE_SSL_CACERT,              /* 60 - problem with the CA cert (path?) */CURLE_BAD_CONTENT_ENCODING,    /* 61 - Unrecognized/bad encoding */CURLE_LDAP_INVALID_URL,        /* 62 - Invalid LDAP URL */CURLE_FILESIZE_EXCEEDED,       /* 63 - Maximum file size exceeded */CURLE_USE_SSL_FAILED,          /* 64 - Requested FTP SSL level failed */CURLE_SEND_FAIL_REWIND,        /* 65 - Sending the data requires a rewindthat failed */CURLE_SSL_ENGINE_INITFAILED,   /* 66 - failed to initialise ENGINE */CURLE_LOGIN_DENIED,            /* 67 - user, password or similar was notaccepted and we failed to login */CURLE_TFTP_NOTFOUND,           /* 68 - file not found on server */CURLE_TFTP_PERM,               /* 69 - permission problem on server */CURLE_REMOTE_DISK_FULL,        /* 70 - out of disk space on server */CURLE_TFTP_ILLEGAL,            /* 71 - Illegal TFTP operation */CURLE_TFTP_UNKNOWNID,          /* 72 - Unknown transfer ID */CURLE_REMOTE_FILE_EXISTS,      /* 73 - File already exists */CURLE_TFTP_NOSUCHUSER,         /* 74 - No such user */CURLE_CONV_FAILED,             /* 75 - conversion failed */CURLE_CONV_REQD,               /* 76 - caller must register conversioncallbacks using curl_easy_setopt optionsCURLOPT_CONV_FROM_NETWORK_FUNCTION,CURLOPT_CONV_TO_NETWORK_FUNCTION, andCURLOPT_CONV_FROM_UTF8_FUNCTION */CURLE_SSL_CACERT_BADFILE,      /* 77 - could not load CACERT file, missingor wrong format */CURLE_REMOTE_FILE_NOT_FOUND,   /* 78 - remote file not found */CURLE_SSH,                     /* 79 - error from the SSH layer, somewhatgeneric so the error message will be ofinterest when this has happened */CURLE_SSL_SHUTDOWN_FAILED,     /* 80 - Failed to shut down the SSLconnection */CURLE_AGAIN,                   /* 81 - socket is not ready for send/recv,wait till it's ready and try again (Addedin 7.18.2) */CURLE_SSL_CRL_BADFILE,         /* 82 - could not load CRL file, missing orwrong format (Added in 7.19.0) */CURLE_SSL_ISSUER_ERROR,        /* 83 - Issuer check failed.  (Added in7.19.0) */CURLE_FTP_PRET_FAILED,         /* 84 - a PRET command failed */CURLE_RTSP_CSEQ_ERROR,         /* 85 - mismatch of RTSP CSeq numbers */CURLE_RTSP_SESSION_ERROR,      /* 86 - mismatch of RTSP Session Ids */CURLE_FTP_BAD_FILE_LIST,       /* 87 - unable to parse FTP file list */CURLE_CHUNK_FAILED,            /* 88 - chunk callback reported error */CURLE_NO_CONNECTION_AVAILABLE, /* 89 - No connection available, thesession will be queued */CURLE_SSL_PINNEDPUBKEYNOTMATCH, /* 90 - specified pinned public key did notmatch */CURLE_SSL_INVALIDCERTSTATUS,   /* 91 - invalid certificate status */CURLE_HTTP2_STREAM,            /* 92 - stream error in HTTP/2 framing layer*/CURLE_RECURSIVE_API_CALL,      /* 93 - an api function was called frominside a callback */CURL_LAST /* never use! */
} CURLcode;

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