GBK编码数据转码为UTF-8格式

#include <windows.h>

#include <wchar.h>

int CFileListModel::GBKToUTF8(unsigned char * lpGBKStr,unsigned char * lpUTF8Str,int nUTF8StrLen)

{

    wchar_t * lpUnicodeStr = NULL;

    int nRetLen = 0;

    if(!lpGBKStr)  //如果GBK字符串为NULL则出错退出

        return 0;

    nRetLen = ::MultiByteToWideChar(CP_ACP,0,(char *)lpGBKStr,-1,NULL,NULL);  //获取转换到Unicode编码后所需要的字符空间长度

    lpUnicodeStr = new WCHAR[nRetLen + 1];  //为Unicode字符串空间

    nRetLen = ::MultiByteToWideChar(CP_ACP,0,(char *)lpGBKStr,-1,lpUnicodeStr,nRetLen);  //转换到Unicode编码

    if(!nRetLen)  //转换失败则出错退出

        return 0;

    nRetLen = ::WideCharToMultiByte(CP_UTF8,0,lpUnicodeStr,-1,NULL,0,NULL,NULL);  //获取转换到UTF8编码后所需要的字符空间长度

    if(!lpUTF8Str)  //输出缓冲区为空则返回转换后需要的空间大小

    {

        if(lpUnicodeStr)

            delete []lpUnicodeStr;

        return nRetLen;

    }

    if(nUTF8StrLen < nRetLen)  //如果输出缓冲区长度不够则退出

    {

        if(lpUnicodeStr)

            delete []lpUnicodeStr;

        return 0;

    }

    nRetLen = ::WideCharToMultiByte(CP_UTF8,0,lpUnicodeStr,-1,(char *)lpUTF8Str,nUTF8StrLen,NULL,NULL);  //转换到UTF8编码

    if(lpUnicodeStr)

        delete []lpUnicodeStr;

    return nRetLen;

}