windows C++ 编码转换

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已于 2024-08-23 17:39:45 修改

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文章标签： c++ 开发语言

于 2024-04-09 16:16:41 首次发布

本文链接：https://blog.youkuaiyun.com/qq_43179054/article/details/137556820

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本文介绍了一个用于在 Windows 环境下实现 ANSI 和 UTF-8 编码相互转换的 C++ 实现方法，并提供了一种更为安全的字符串编码转换代码。

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ansi与utf8相互转换

#include <winnls.h>
#include <malloc.h>
LPCSTR AnsiToUtf8(LPCSTR Ansi)
{
  int WLength = MultiByteToWideChar(CP_ACP, 0, Ansi, -1, NULL, 0);
  LPWSTR pszW = (LPWSTR) _alloca((WLength+1) * sizeof(WCHAR));
  MultiByteToWideChar(CP_ACP, 0, Ansi, -1, pszW, WLength);

  int ALength = WideCharToMultiByte(CP_UTF8, 0, pszW, -1, NULL, 0, NULL, NULL);
  LPSTR pszA = (LPSTR)_alloca( ALength + 1);
  WideCharToMultiByte(CP_UTF8, 0, pszW, -1, pszA, ALength, NULL, NULL);
  pszA[ALength] = 0;

  return pszA;
}

LPCSTR WcharToUtf8(LPCWSTR szUnicode)
{
  int ALength = WideCharToMultiByte(CP_UTF8, 0, szUnicode, -1, NULL, 0, NULL, NULL);
  LPSTR pszA = (LPSTR)_alloca( ALength + 1);
  WideCharToMultiByte(CP_UTF8, 0, szUnicode, -1, pszA, ALength, NULL, NULL);
  pszA[ALength] = 0;

  return pszA;
}

LPCSTR Utf8toAnsi( LPCSTR utf8 )
{
  int WLength = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, NULL );
  LPWSTR pszW = (LPWSTR) _alloca( (WLength + 1) *sizeof(WCHAR) ) ;
  MultiByteToWideChar(CP_UTF8, 0, utf8, -1, pszW, WLength );
  pszW[WLength] = 0;

  int ALength = WideCharToMultiByte(CP_ACP, 0, pszW, -1, NULL, 0, NULL, NULL);
  LPSTR pszA = ( LPSTR ) _alloca ( ALength + 1 );
  WideCharToMultiByte(CP_ACP, 0, pszW, -1, pszA, ALength, NULL, NULL);
  pszA[ALength] = 0;

  return pszA;
}

LPCWSTR Utf8toWchar( LPCSTR utf8 )
{
  int WLength = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, NULL );
  LPWSTR pszW = (LPWSTR) _alloca( (WLength + 1) *sizeof(WCHAR) ) ;
  MultiByteToWideChar(CP_UTF8, 0, utf8, -1, pszW, WLength );
  pszW[WLength] = 0;
  return pszW;
}

重新又调整了更安全的代码

CString ChangeStringCodePage(CString strTemp,UINT uSrcCodePage, UINT uDesCodePage)
{
    CString strResult = strTemp;
    DWORD dwBufSize = WideCharToMultiByte(uSrcCodePage, 0, strTemp, -1, NULL, 0, NULL, FALSE);
    dwBufSize += 8;
    char *pszBuf = new char[dwBufSize];
    if (NULL == pszBuf)
    {
        //申请内存失败
        return strResult;
    }

    memset(pszBuf, 0, dwBufSize);
    if (0 == WideCharToMultiByte(uSrcCodePage, 0, strTemp,-1, pszBuf, dwBufSize, NULL, NULL))
    {
        delete []pszBuf;
        pszBuf = NULL;
        //宽字节转多字节失败
        return strResult;
    }

    dwBufSize = MultiByteToWideChar(uDesCodePage, 0, pszBuf, -1, NULL, 0);
    dwBufSize += 8;
    TCHAR *pszPath = new TCHAR[dwBufSize];
    if (NULL == pszPath)
    {
        //申请内存失败
        return strResult;
    }

    memset(pszPath, 0, dwBufSize * sizeof(TCHAR));
    if (0 == MultiByteToWideChar(uDesCodePage, 0, pszBuf, -1, pszPath, dwBufSize))
    {
        delete []pszBuf;
        pszBuf = NULL;
        delete []pszPath;
        pszPath = NULL;
        //多字节转宽字节失败
        return strResult;
    }

    delete []pszBuf;
    pszBuf = NULL;

    strResult = pszPath;

    delete []pszPath;
    pszPath = NULL;

    return strResult;
}


int main()
{
	CString strRecv;
	strRecv = ChangeStringCodePage(strRecv, CP_ACP, CP_UTF8);
}