libcurl第十課 HTTPS交互

場(chǎng)景
?????? 跟樂(lè)橙云訪問(wèn)，需要使用HTTPS協(xié)議

額外配置，否則執(zhí)行返回CURLE_UNSUPPORTED_PROTOCOL錯(cuò)誤
1）libcurl版本升級(jí)到7.61.0版本
2）libcurl項(xiàng)目屬性中預(yù)編譯器添加USE_WINDOWS_SSPI 以及 USE_SCHANNEL
3）在引用項(xiàng)目的屬性中添加額外的靜態(tài)庫(kù)Crypt32.lib，Wldap32.lib
? ?

代碼

size_t CLeChengIPC::WriteResponseBody(void *ptr, size_t size, size_t nmemb, void *userData)
{
?std::string* pStrBuffer = (std::string*)userData;
?size_t nLen = size * nmemb;
?pStrBuffer->append((char*)ptr, nLen);
?return nLen;
}

int CLeChengIPC::CommunicateWithServerUsingHTTPS(const std::string &strPostData, const std::string &strUrl, std::string &strResponseData)
{
?CURL *pCurlHandle = curl_easy_init();
?curl_easy_setopt(pCurlHandle, CURLOPT_CUSTOMREQUEST, "POST");
?curl_easy_setopt(pCurlHandle, CURLOPT_URL, strUrl.c_str());
?curl_easy_setopt(pCurlHandle, CURLOPT_WRITEFUNCTION, WriteResponseBody);//設(shè)置回調(diào)函數(shù)
?curl_easy_setopt(pCurlHandle, CURLOPT_HEADER, 1);//保存HTTP頭部信息到strResponseData
?curl_easy_setopt(pCurlHandle, CURLOPT_WRITEDATA, &strResponseData);//設(shè)置回調(diào)函數(shù)的參數(shù),獲取反饋信息
?curl_easy_setopt(pCurlHandle, CURLOPT_TIMEOUT, 15);//接收數(shù)據(jù)時(shí)超時(shí)設(shè)置，如果10秒內(nèi)數(shù)據(jù)未接收完，直接退出
?curl_easy_setopt(pCurlHandle, CURLOPT_MAXREDIRS, 1);//查找次數(shù)，防止查找太深
?curl_easy_setopt(pCurlHandle, CURLOPT_CONNECTTIMEOUT, 5);//連接超時(shí)，這個(gè)數(shù)值如果設(shè)置太短可能導(dǎo)致數(shù)據(jù)請(qǐng)求不到就斷開了
?curl_easy_setopt(pCurlHandle, CURLOPT_SSL_VERIFYPEER, false);//設(shè)定為不驗(yàn)證證書和HOST
?curl_easy_setopt(pCurlHandle, CURLOPT_SSL_VERIFYHOST, false);
?curl_easy_setopt(pCurlHandle, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
?curl_easy_setopt(pCurlHandle, CURLOPT_POSTFIELDS, strPostData.c_str());
?CURLcode nRet= curl_easy_perform(pCurlHandle);
?curl_easy_cleanup(pCurlHandle);
?return nRet;
}

注意
enum {
? CURL_SSLVERSION_DEFAULT,
? CURL_SSLVERSION_TLSv1, /* TLS 1.x */
? CURL_SSLVERSION_SSLv2,
? CURL_SSLVERSION_SSLv3,
? CURL_SSLVERSION_TLSv1_0,
? CURL_SSLVERSION_TLSv1_1,
? CURL_SSLVERSION_TLSv1_2,
? CURL_SSLVERSION_TLSv1_3,
? CURL_SSLVERSION_LAST /* never use, keep last */
};
? CURL_SSLVERSION_SSLv2和CURL_SSLVERSION_SSLv3兩個(gè)宏定義不能使用，否則返回錯(cuò)誤CURLE_SSL_CONNECT_ERROR，建議使用CURL_SSLVERSION_TLSv1_2宏定義

修訂
2019/7/8 使用CURL_SSLVERSION_SSLv2導(dǎo)致CURLE_SSL_CONNECT_ERROR異常問(wèn)題記錄