C++中，将.txt文件的编码由UTF-8转换为ANSI

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1，将UTF-8转换为

int Utf8ToAnsi(const char *pstrUTF8, char *pstrAnsi)
{
    int i = 0;
    int j = 0;
    char strUnicode[200] = {0};

    i = MultiByteToWideChar(CP_UTF8, 0, pstrUTF8, -1, NULL, 0);
    memset(strUnicode, 0, i);
    MultiByteToWideChar(CP_UTF8, 0, pstrUTF8, -1, strUnicode, i);
    j = WideCharToMultiByte(CP_ACP, 0, strUnicode, -1, NULL, 0, NULL, NULL);
    WideCharToMultiByte(CP_ACP, 0, strUnicode, -1, pstrAnsi, j, NULL, NULL);
    return 0;
}

2，其他的编码转换

qp::StringW Global::AnsiToUnicode(const char* buf)
{
int len = ::MultiByteToWideChar(CP_ACP, 0, buf, -1, NULL, 0);
if (len == 0) return L"";

std::vector<wchar_t> unicode(len);
::MultiByteToWideChar(CP_ACP, 0, buf, -1, &unicode[0], len);

return &unicode[0];
}

qp::StringA Global::UnicodeToAnsi(const wchar_t* buf)
{
int len = ::WideCharToMultiByte(CP_ACP, 0, buf, -1, NULL, 0, NULL, NULL);
if (len == 0) return "";

std::vector<char> utf8(len);
::WideCharToMultiByte(CP_ACP, 0, buf, -1, &utf8[0], len, NULL, NULL);

return &utf8[0];
}

qp::StringW Global::Utf8ToUnicode(const char* buf)
{
int len = ::MultiByteToWideChar(CP_UTF8, 0, buf, -1, NULL, 0);
if (len == 0) return L"";

std::vector<wchar_t> unicode(len);
::MultiByteToWideChar(CP_UTF8, 0, buf, -1, &unicode[0], len);

return &unicode[0];
}

qp::StringA Global::UnicodeToUtf8(const wchar_t* buf)
{
int len = ::WideCharToMultiByte(CP_UTF8, 0, buf, -1, NULL, 0, NULL, NULL);
if (len == 0) return "";

std::vector<char> utf8(len);
::WideCharToMultiByte(CP_UTF8, 0, buf, -1, &utf8[0], len, NULL, NULL);

return &utf8[0];
}

程序来自http://topic.csdn.net/u/20101008/12/895e5aaa-3db5-4c9f-8d06-ae7b04913132.html。

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