(C++)UrlEncode的標準實現 libcul

http://blog.csdn.net/gemo/article/details/8468311

libcul post 中文/特殊字符 url 連接時，需要轉編碼 == 

  關於UrlEncode的實現(C++)，網上有很多不同的版本，對需要編碼的字符集的選取並不統一。那麼到底有沒有標準呢？答案是有的，參見wiki

    絕對不編碼的，只有字母、數字、短橫線(-)、下劃線(_)、點(.)和波浪號(~)，其他字符要視情況而定，所以一般性的urlencode只需保留上述字符不進行編碼。

    下面給出實現：

unsigned char ToHex(unsigned char x) 
{ 
    return  x > 9 ? x + 55 : x + 48; 
}

unsigned char FromHex(unsigned char x) 
{ 
    unsigned char y;
    if (x >= 'A' && x <= 'Z') y = x - 'A' + 10;
    else if (x >= 'a' && x <= 'z') y = x - 'a' + 10;
    else if (x >= '0' && x <= '9') y = x - '0';
    else assert(0);
    return y;
}

std::string UrlEncode(const std::string& str)
{
    std::string strTemp = "";
    size_t length = str.length();
    for (size_t i = 0; i < length; i++)
    {
        if (isalnum((unsigned char)str[i]) || 
            (str[i] == '-') ||
            (str[i] == '_') || 
            (str[i] == '.') || 
            (str[i] == '~'))
            strTemp += str[i];
        else if (str[i] == ' ')
            strTemp += "+";
        else
        {
            strTemp += '%';
            strTemp += ToHex((unsigned char)str[i] >> 4);
            strTemp += ToHex((unsigned char)str[i] % 16);
        }
    }
    return strTemp;
}

std::string UrlDecode(const std::string& str)
{
    std::string strTemp = "";
    size_t length = str.length();
    for (size_t i = 0; i < length; i++)
    {
        if (str[i] == '+') strTemp += ' ';
        else if (str[i] == '%')
        {
            assert(i + 2 < length);
            unsigned char high = FromHex((unsigned char)str[++i]);
            unsigned char low = FromHex((unsigned char)str[++i]);
            strTemp += high*16 + low;
        }
        else strTemp += str[i];
    }
    return strTemp;
}

這個函數可以直接用：

std::string UrlEncode(const std::string& str) 

libcul 本身，內部提供轉編碼函數 ：char *curl_escape(const char *string, int length)

int CHttpClient::Posts(const std::string & strUrl, const std::string & strPost, std::string & strResponse, const char * pCaPath)
{
	CURLcode res;
	CURL* curl = curl_easy_init();
	if (NULL == curl)
	{
		return CURLE_FAILED_INIT;
	}
	if (m_bDebug)
	{
		curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
		curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, OnDebug);
	}
	curl_slist *http_headers = NULL;
	CString strHead;
	CString strVersion = UTOUULoginManager->m_version.c_str();
	strHead.Format(_T("User-app:demo/%s"), strVersion);
	string head = nbase::UTF16ToUTF8(strHead.GetBuffer(0));
	http_headers = curl_slist_append(http_headers, head.c_str());
	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, http_headers);

	curl_easy_setopt(curl, CURLOPT_URL, strUrl.c_str());
	curl_easy_setopt(curl, CURLOPT_POST, 1);
	string str = curl_escape(strPost.c_str(), strPost.length());
	string str2 = UrlEncode(strPost.c_str());
	curl_easy_setopt(curl, CURLOPT_POSTFIELDS, str);
	curl_easy_setopt(curl, CURLOPT_READFUNCTION, NULL);
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, OnWriteData);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&strResponse);
	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
	if (NULL == pCaPath)
	{
		curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
		curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, false);
	}
	else
	{
		//缺省情況就是PEM，所以無需設置，另外支持DER
		//curl_easy_setopt(curl,CURLOPT_SSLCERTTYPE,"PEM");
		curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, true);
		curl_easy_setopt(curl, CURLOPT_CAINFO, pCaPath);
	}
	curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 3);
	curl_easy_setopt(curl, CURLOPT_TIMEOUT, 3);
	res = curl_easy_perform(curl);
	curl_easy_cleanup(curl);
	return res == CURLE_OK;

}