Question

所以我们have这样的功能：

std::string url_encode_wstring(const std::wstring &input)
     {
         std::string output;
         int cbNeeded = WideCharToMultiByte(CP_UTF8, 0, input.c_str(), -1, NULL, 0, NULL, NULL);
         if (cbNeeded > 0) {
             char *utf8 = new char[cbNeeded];
             if (WideCharToMultiByte(CP_UTF8, 0, input.c_str(), -1, utf8, cbNeeded, NULL, NULL) != 0) {
                 for (char *p = utf8; *p; *p++) {
                     char onehex[5];
                     _snprintf(onehex, sizeof(onehex), "%%%02.2X", (unsigned char)*p);
                     output.append(onehex);
                 }
             }
             delete[] utf8;
         }
         return output;
     }

它对Windows的影响，但我想知道如何（并且可能）使它在linux下工作？

Answer 1

恕我直言，您应该使用便携式字符编解码器库。这是使用iconv的最小可移植代码的示例，这应该是绰绰有余的。它应该在Windows上运行（如果它可以，你可以完全摆脱你的Windows特定代码）。我遵循GNU指南不使用wcstombs＆amp;共同功能（https://www.gnu.org/s/hello/manual/libc/iconv-Examples.html）根据用例，适当处理错误......并提高性能，您可以创建一个类。

#include <iostream>

#include <iconv.h>
#include <cerrno>
#include <cstring>
#include <stdexcept>

std::string wstring_to_utf8_string(const std::wstring &input)
{
    size_t in_size = input.length() * sizeof(wchar_t);
    char * in_buf = (char*)input.data();
    size_t buf_size = input.length() * 6; // pessimistic: max UTF-8 char size
    char * buf = new char[buf_size];
    memset(buf, 0, buf_size);
    char * out_buf(buf);
    size_t out_size(buf_size);
    iconv_t conv_desc = iconv_open("UTF-8", "wchar_t");
    if (conv_desc == iconv_t(-1))
        throw std::runtime_error(std::string("Could not open iconv: ") + strerror(errno));
    size_t iconv_value = iconv(conv_desc, &in_buf, &in_size, &out_buf, &out_size);
    if (iconv_value == -1)
        throw std::runtime_error(std::string("When converting: ") + strerror(errno));
    int ret = iconv_close(conv_desc);
    if (ret != 0)
        throw std::runtime_error(std::string("Could not close iconv: ") + strerror(errno));
    std::string s(buf);
    delete [] buf;
    return s;
 }


int main() {
    std::wstring in(L"hello world");
    std::wcout << L"input: [" << in << L"]" << std::endl;
    std::string out(wstring_to_utf8_string(in));
    std::cerr << "output: [" << out << "]" << std::endl;
    return 0;
}

如何让我的`std :: string url_encode_wstring（const std :: wstring＆amp; input）`在Linux上运行？

1 个答案: