libcurl 基本使用

Posted 2020-10-02

编译使用

https://my.oschina.net/u/1420791/blog/198247

当前例子调用libcurl发送Post请求，但是在其中调用UrlEncode函数对发送的Post数据进行了编码，因为指定了application/x-www-form-urlencoded编码格式，说明libcurl并没有提供一个方法进行urlencode编码，这个需要注意

size_t write_data(void *buffer, size_t size, size_t nmemb, void *userp)

{

ofstream ofs;

ofs.open("reponse.html");

string str = (char*)buffer;

ofs << str << endl;

return 0;

}

int TestCurlPost()

{

CURL* curl;

CURLcode res;

FILE *fptr;

struct curl_slist *http_header = NULL;

if ((fptr = fopen(FILENAME, "w")) == NULL) {

fprintf(stderr, "fopen file error: %s\n", FILENAME);

return -1;

}

Json::Value jsonLoginContext;

jsonLoginContext["loginAccount"] = "admin";

Json::Value jsonParamContext;

jsonParamContext["a"] = 1;

jsonParamContext["b"] = 2;

jsonParamContext["c"] = 3;

Json::Value jsonParm;

jsonParm.append(jsonParamContext);

std::string strPostData= "authorJson=";

strPostData += jsonLoginContext.toStyledString();

strPostData += "&parmJson=";

strPostData += jsonParamContext.toStyledString();

Json::Value json;

json["authorJson"] = "username";

Json::FastWriter writer;

std::string strResult = UrlEncode(strPostData);

char szSendBuffer[1024] = { 0 };

strcpy(szSendBuffer, strResult.c_str());

curl = curl_easy_init();

if (curl)

{

curl_easy_setopt(curl, CURLOPT_URL, "http://120.177.55.115:8089/cs/restfull/operationRestfullApi/testPost");

curl_easy_setopt(curl, CURLOPT_POST, 1);

curl_easy_setopt(curl, CURLOPT_POSTFIELDS, szSendBuffer);

curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);

curl_easy_setopt(curl, CURLOPT_WRITEDATA, fptr);

curl_slist *plist1 = curl_slist_append(NULL,

"Content-Type: application/x-www-form-urlencoded; charset=UTF-8");

curl_easy_setopt(curl, CURLOPT_HTTPHEADER, plist1);

res = curl_easy_perform(curl);

if (res != CURLE_OK)

{

return -1;

}

}

return 0;

}