#include <string>

#include <vector>

inline BYTE toHex(const BYTE x)

{

    return x>9?x+55:x+48;

}

std::string WC2UT(const wchar_t* buf)

{

    int len=WideCharToMultiByte(CP_UTF8,0,buf,-1,NULL,0,NULL,NULL);

    std::vector<char> utf8(len);

    WideCharToMultiByte(CP_UTF8,0,buf,-1,&utf8[0],len,NULL,NULL);

    return std::string(&utf8[0]);

}

std::wstring MB2WC(const char* buf)

{

    int len=MultiByteToWideChar(CP_ACP,0,buf,-1,NULL,0);

    std::vector<wchar_t> unicode(len);

    MultiByteToWideChar(CP_ACP,0,buf,-1,&unicode[0],len);

    return std::wstring(&unicode[0]);

}

//参数要用指针。

void URLEncode(CString* str)

{

    std::string sln=str->GetBuffer(0);

    sln=WC2UT(MB2WC(sln.c_str()).c_str());

    std::string sOut;

    for (size_t ix=0;ix<sln.size();ix++)

    {

        BYTE buf[4];

        memset(buf,0,4);

        if (isalnum((BYTE)sln[ix]))

            buf[0]=sln[ix];

        else if (isspace((BYTE)sln[ix]))

            buf[0]='+';

        else

        {

            buf[0]='%';

            buf[1]=toHex((BYTE)sln[ix]>>4);

            buf[2]=toHex((BYTE)sln[ix]%16);

        }

        sOut+=(char*)buf;

    }

    CString out=sOut.c_str();

    *str=out;

}