(C++)UrlEncode的标准实现 libcul

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libcul post 中文/特殊字符 url 连接时，需要转编码 ==

关于UrlEncode的实现(C++)，网上有很多不同的版本，对需要编码的字符集的选取并不统一。那么到底有没有标准呢？答案是有的，参见wiki

绝对不编码的，只有字母、数字、短横线(-)、下划线(_)、点(.)和波浪号(~)，其他字符要视情况而定，所以一般性的urlencode只需保留上述字符不进行编码。

下面给出实现：

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;
}

这个函数可以直接用：

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

libcul 本身，内部提供转编码函数 ：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
{
//缺省情况就是PEM，所以无需设置，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;

}