字符串转换

zzyy · 发表于 2022-6-29 17:13:28

字符串转换功能有人有写好的代码吗？

kuroro · 发表于 2022-7-3 10:13:27

这个很全了宽字节转窄字节字符串相互转换之类的

string GBKToUTF8(const std::string & strGBK)
{
string strOutUTF8 = "";
WCHAR * str1;
int n = MultiByteToWideChar(CP_ACP, 0, strGBK.c_str(), -1, NULL, 0);
str1 = new WCHAR[n];
MultiByteToWideChar(CP_ACP, 0, strGBK.c_str(), -1, str1, n);
n = WideCharToMultiByte(CP_UTF8, 0, str1, -1, NULL, 0, NULL, NULL);
char * str2 = new char[n];
WideCharToMultiByte(CP_UTF8, 0, str1, -1, str2, n, NULL, NULL);
strOutUTF8 = str2;
delete[]str1;
str1 = NULL;
delete[]str2;
str2 = NULL;
return strOutUTF8;
}
string UTF8ToGBK(const std::string & strUTF8)
{
string strOutGBK = "";
WCHAR * str1;
int n = MultiByteToWideChar(CP_UTF8, 0, strUTF8.c_str(), -1, NULL, 0);
str1 = new WCHAR[n];
MultiByteToWideChar(CP_UTF8, 0, strUTF8.c_str(), -1, str1, n);
n = WideCharToMultiByte(CP_ACP, 0, str1, -1, NULL, 0, NULL, NULL);
char * str2 = new char[n];
WideCharToMultiByte(CP_ACP, 0, str1, -1, str2, n, NULL, NULL);
strOutGBK = str2;
delete[]str1;
str1 = NULL;
delete[]str2;
str2 = NULL;
return strOutGBK;
}
wstring UTF8ToGBKW(const std::string & strUTF8)
{
wstring wstrOutGBK = L"";
WCHAR * str1;
int n = MultiByteToWideChar(CP_UTF8, 0, strUTF8.c_str(), -1, NULL, 0);
str1 = new WCHAR[n];
MultiByteToWideChar(CP_UTF8, 0, strUTF8.c_str(), -1, str1, n);
n = WideCharToMultiByte(CP_ACP, 0, str1, -1, NULL, 0, NULL, NULL);
wstrOutGBK = str1;
delete[]str1;
str1 = NULL;
return wstrOutGBK;
}
int hexCharToInt(char c)
{
if (c >= '0' && c <= '9') return (c - '0');
if (c >= 'A' && c <= 'F') return (c - 'A' + 10);
if (c >= 'a' && c <= 'f') return (c - 'a' + 10);
return 0;
}
bool ReadFileData(const char* cFilePath,string& strdata)
{
filebuf *pbuf=NULL;
ifstream filestr;
long size=0;
filestr.open (cFilePath, ios::binary);
if( filestr.is_open() )
{
//获取文件大小
pbuf=filestr.rdbuf();
size=pbuf->pubseekoff (0,ios::end,ios::in);
pbuf->pubseekpos (0,ios::in);
// 获取文件内容
size+=1;
char * pdata=new char[size];
memset(pdata,0,size);
streamsize result=pbuf->sgetn (pdata,size);
filestr.close();
strdata=string(pdata);
//utf-8 txt格式头0xef,0xbb,0xbf
char cHead1=pdata[0];
char cHead2=pdata[1];
char cHead3=pdata[2];
char cHeadUtf81=0xef;
char cHeadUtf82=0xbb;
char cHeadUtf83=0xbf;
if( size >= 3 && cHead1 == cHeadUtf81 && cHead2 == cHeadUtf82 && cHead3 == cHeadUtf83 )
{
string strUtf8=strdata;
strdata=strUtf8.substr(3,strUtf8.size()-3);
}
delete []pdata;
return true;
}
return false;
}
long ReadFileData(const char* cFilePath,char *&pdata)
{
filebuf *pbuf=NULL;
ifstream filestr;
long lsize=0;
filestr.open (cFilePath, ios::binary);
if( filestr.is_open() )
{
pbuf=filestr.rdbuf();
lsize=pbuf->pubseekoff (0,ios::end,ios::in);
pbuf->pubseekpos (0,ios::in);
pdata=new char[lsize];
memset(pdata,0,lsize);
streamsize result=pbuf->sgetn (pdata,lsize);
filestr.close();
}
return lsize;
}
std::wstring StringToWString(const std::string &str)
{
std::wstring wstr(str.length(),L' ');
std::copy(str.begin(), str.end(), wstr.begin());
return wstr;
}
std::string WStringToString(const std::wstring &wstr)
{
std::string str(wstr.length(), ' ');
std::copy(wstr.begin(), wstr.end(), str.begin());
return str;
}
string ws2s(const std::wstring& ws)
{
std::string curLocale = setlocale(LC_ALL, NULL); // curLocale = "C";
setlocale(LC_ALL, "chs");
const wchar_t* _Source = ws.c_str();
size_t _Dsize = 2 * ws.size() + 1;
char *_Dest = new char[_Dsize];
memset(_Dest,0,_Dsize);
wcstombs(_Dest,_Source,_Dsize);
std::string result = _Dest;
delete []_Dest;
setlocale(LC_ALL, curLocale.c_str());
return result;
}
std::wstring s2ws(const std::string& s)
{
setlocale(LC_ALL, "chs");
const char* _Source = s.c_str();
size_t _Dsize = s.size() + 1;
wchar_t *_Dest = new wchar_t[_Dsize];
wmemset(_Dest, 0, _Dsize);
mbstowcs(_Dest,_Source,_Dsize);
std::wstring result = _Dest;
delete []_Dest;
setlocale(LC_ALL, "C");
return result;
}
void Utf8ToString(string strUtf8, string & strAnsi)
{
wstring wstr;
int len = MultiByteToWideChar(CP_UTF8,0,strUtf8.c_str(),strUtf8.size(),NULL,0);
wstr.resize(len);
MultiByteToWideChar(CP_UTF8,0,strUtf8.c_str(),strUtf8.size(),&wstr[0],len);
len=WideCharToMultiByte(CP_ACP,0,wstr.c_str(),wstr.size(),NULL,0,NULL,NULL);
strAnsi.resize(len);
WideCharToMultiByte(CP_ACP,0,wstr.c_str(),wstr.size(),&strAnsi[0],len,NULL,NULL);
}
void Utf8ToWString(wstring& wstr,const char* pUTF8Text)
{
if (NULL == pUTF8Text)
{
return;
}
int unicodeLen = ::MultiByteToWideChar( CP_UTF8, 0, pUTF8Text, -1, NULL, 0 );
wchar_t* pUnicode = new wchar_t[unicodeLen+1];
if (NULL == pUnicode)
{
return;
}
MultiByteToWideChar( CP_UTF8, 0, pUTF8Text, -1, (LPWSTR)pUnicode, unicodeLen );
wstr = pUnicode;
delete []pUnicode;
}
char* WStringToUtf8(const wstring& wstr)
{
char *buffer = NULL;
int length = WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), -1, NULL, 0, NULL, NULL);
if (length <= 0)
{
return NULL;
}
buffer = new char[length];
if (buffer == NULL)
{
return NULL;
}
ZeroMemory(buffer, length);
WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), -1, buffer, length, NULL, NULL);
return buffer;
}
wchar_t * ucTowc(const unsigned char * pUC)
{
// get the length
int nCharacters = 0; int nIndex = 0;
while (pUC[nIndex] != 0)
{
if ((pUC[nIndex] & 0x80) == 0)
nIndex += 1;
else if ((pUC[nIndex] & 0xE0) == 0xE0)
nIndex += 3;
else
nIndex += 2;
nCharacters += 1;
}
// make a UTF-16 string
wchar_t * pWC = new wchar_t [nCharacters + 1];
nIndex = 0; nCharacters = 0;
while (pUC[nIndex] != 0)
{
if ((pUC[nIndex] & 0x80) == 0)
{
pWC[nCharacters] = pUC[nIndex];
nIndex += 1;
}
else if ((pUC[nIndex] & 0xE0) == 0xE0)
{
pWC[nCharacters] = ((pUC[nIndex] & 0x1F) << 12) | ((pUC[nIndex + 1] & 0x3F) << 6) | (pUC[nIndex + 2] & 0x3F);
nIndex += 3;
}
else
{
pWC[nCharacters] = ((pUC[nIndex] & 0x3F) << 6) | (pUC[nIndex + 1] & 0x3F);
nIndex += 2;
}
nCharacters += 1;
}
pWC[nCharacters] = 0;
return pWC;
}
string replace(const char *pszSrc, const char *pszOld, const char *pszNew)
{
std::string strContent, strTemp;
strContent.assign( pszSrc );
std::string::size_type nPos = 0;
while( true )
{
nPos = strContent.find(pszOld, nPos);
strTemp = strContent.substr(nPos+strlen(pszOld), strContent.length());
if ( nPos == std::string::npos )
{
break;
}
strContent.replace(nPos,strContent.length(), pszNew );
strContent.append(strTemp);
nPos +=strlen(pszNew) - strlen(pszOld)+1; //防止重复替换避免死循环
}
return strContent;
}

复制代码

hu111 · 发表于 2022-7-5 20:02:04

感谢大佬分享

zhouhb2003 · 发表于 2023-1-8 12:43:14

是有例子吗？太好了

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