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在C++中对加号进行URL编码,可以使用urlencode
函数来处理。下面是一个示例代码:
#include <iostream> #include <string> #include <sstream> std::string urlencode(const std::string &s) { std::ostringstream escaped; escaped.fill('0'); escaped << std::hex; for (std::string::const_iterator i = s.begin(), n = s.end(); i != n; ++i) { std::string::value_type c = (*i); // Keep alphanumeric and other accepted characters intact if (isalnum(c) || c == '-' || c == '_' || c == '.' || c == '~') { escaped << c; continue; } // Any other characters are percent-encoded escaped << std::uppercase; escaped << '%' << std::setw(2) << int((unsigned char) c); escaped << std::nouppercase; } return escaped.str(); } int main() { std::string input = "Hello+World"; std::string output = urlencode(input); std::cout << "Encoded string: " << output << std::endl; return 0; }
在上面的代码中,urlencode
函数将输入字符串中的加号(+
)以及其他非字母数字字符进行URL编码,并返回编码后的字符串。您可以将需要进行URL编码的字符串传入urlencode
函数中,即可获取编码后的结果。