vc类型转换函数大全
windows c++中存在各种类型，在实际应用过程中也需要将类型互相转换，故整理了常用类型之间的转换并将之封装成函数，仅供参考，有什么不对的地方，还请指正！
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1、函数：ToInteger
描述：将CString转换为int
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int ToInteger(CString csSource)
{
if (csSource .Trim() == _T(""))
{
return -1;
}
int nResult = _ttoi(csSource);
return nResult;
}
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2、函数：ToString
描述：将int转换为CString
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bHex表示是否转换为十六进制
CString ToString(int nSource,BOOL bHex)
{
if (bHex)
{
strResult.Format(_T("%02x"),nSource);
}
else
{
strResult.Format(_T("%d"),nSource);
}
return strResult;
}
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3、函数：ToString
描述：将int转换为CString
注意：delete
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void ToPChar(LPWSTR pszSource,char* &pcrdest)
{
int nsourceLen=WideCharToMultiByte(CP_ACP,0,pszSource,-1,NULL,0,NULL,NULL);
if (nsourceLen==0)
{
AfxMessageBox(_T("Empty input value！"));
return;
}
pcrdest=new char[nsourceLen+1];
memset(pcrdest,0x00,sizeof(char)*(nsourceLen+1));
::WideCharToMultiByte(CP_ACP,0,pszSource,-1,pcrdest,nsourceLen,NULL,NULL);
}
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4、函数：无
描述：CString转char *
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#include <atlconv.h>
USES_CONVERSION;
char *cMac = T2A(csCommunitation);
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4、函数：无
描述：char *转wchar *
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①
#include <atlconv.h>
USES_CONVERSION;
char *c = "Hello";
char *cMac = A2W(c);
②
wchar_t ws[100];
swprintf(ws, 100, L"%hs", "ansi string");
③
{
const size_t cSize = strlen(c)+1;
wchar_t* wc = new wchar_t[cSize];
mbstowcs (wc, c, cSize);
return wc;
}
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4、函数：无
描述：wchar *转char*
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①
USES_CONVERSION;
WCHAR* wc = L"Hello World" ;
char* c = W2A(wc);
②
char output[256];
WCHAR* wc = L"Hellow World" ;
sprintf(output, "%ws", wc );
③
#include <comdef.h> // you will need this
const WCHAR* wc = L"Hello World" ;
_bstr_t b(wc);
const char* c = b;
printf("Output: %s\n", c);
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5、函数：Convert
描述：将指针字符串转换为无符号指针字符串
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void Convert (const char* szStr,unsigned char *pBuf,int nBufSize)
{
char szTemp[3] = {0};
int nLen = strlen(szStr);
for (int i = 0,j = 0; i < nLen - 1,j < nBufSize; i += 2,j++)
{
szTemp[0] = szStr[i];
szTemp[1] = szStr[i + 1];
pBuf[j] = (unsigned char) strtoul(szTemp,NULL,16);
}
}
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6、函数：CStringToUnsignedChar
描述：将CString转换为unsigned char *
头文件：#include <atlconv.h>
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unsigned char* CStringToUnsignedChar(CString csCommunitation,unsigned char *ucBuf)
{
USES_CONVERSION;
char *cMac = T2A(csCommunitation);
int nLongth = strlen(cMac)/2;
Convert(cMac,ucBuf,nLongth);
return ucBuf;
}
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7、函数：DwordToCString
描述：将IP地址转换为CString
如将IP地址（如192.168.53.75）转换为一个CString类型的字符串（C0 A8 35 4B）
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CString DwordToCString(CString csIp)
{
DWORD dwIp;
dwIp = htonl(csIp);
CString strMainServerIP;
DWORD dwMainServerIP = ntohl(dwIp);//网络序转到主机序
strMainServerIP.Format(_T("%02X%02X%02X%02X"),
(dwMainServerIP>>24)&0xff,
(dwMainServerIP>>16)&0xff,
(dwMainServerIP>>8)&0xff,
dwMainServerIP&0xff ) ;
return strMainServerIP;
}
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8、函数：CStringTodwIP
描述：将CString的IP地址转换为DWORD类型的IP
如将一个CString类型的字符串（C0 A8 35 4B）转换为IP地址（如192.168.53.75）
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DWORD CStringTodwIP( CString strIP )
{
DWORD dwRet = 0;
CString strIPTemp = _T("");
CString strLeft = _T("");
CString strRight= _T("");
int iPos = 0,iLen = 0;
strIPTemp = strIP.GetBuffer(0);
strRight = strIPTemp;
iPos=strRight.Find(_T("."),0);
iLen=strRight.GetLength();
while (iPos>0)
{
strLeft = strRight.Left(iPos);
dwRet=(dwRet<<8) + (unsigned)_ttoi(strLeft);
strRight = strRight.Right(iLen - iPos - 1);
iLen=strRight.GetLength();
iPos=strRight.Find(_T("."),0);
}
dwRet=(dwRet<<8) + (unsigned)_ttoi(strRight);
return dwRet;
}
（1）短字符与长字符的区别
所谓的短字符，就是8bit来表示的字符，典型的应用是ASCII码，而宽字符，顾名思义，就是用16bit表示的字符，典型的有UNICODE
Char实际上就是unsigned char，WCHAR为宽字符，而TCHAR根据是否支持unicode而不同。在程序使用sizeof(TCHAR)，当默认设置时，这个值是1；当定义UNICODE宏时，这个值是2
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9、函数：TransCStringToTCHAR
描述：将CString转换为TCHAR*
头文件：#include <windows.h>
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TCHAR* CStringToCHAR(CString & str)
{
int nLen = str.GetLength();
TCHAR* szRs = new TCHAR[nLen];
lstrcpy(szRs,str.GetBuffer(nLen));
str.ReleaseBuffer();
return szRs;
}
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10、函数：THCARToChar
描述：将TCHAR*转换为char *
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char * THCARToChar (TCHAR* tchStr)
{
int nLen = 2*wcslen(tchStr);//CString,TCHAR 汉字算一个字符，因此不用普通计算 长度
char* chRtn = new char[nLen +1]
wcstombs(chRtn,tchStr,nLen +1);// 转换成功返回为非负值
return chRtn;
}
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11、函数：GetAnsiString
描述：将 CString （ unicode ）转换为 char*(ANSI)
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char* GetAnsiString(const CString &s)
{
int nSize = 2*s.GetLength();
char *pAnsiString = new char[nSize+1];
wcstombs(pAnsiString, s, nSize+1);
return pAnsiString;
}
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12、函数：TransCStringToTCHAR
描述：将CString转换为TCHAR*
头文件：#include <windows.h>
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TCHAR* CStringToCHAR(CString & str)
{
int nLen = str.GetLength();
TCHAR* szRs = new TCHAR[nLen];
lstrcpy(szRs,str.GetBuffer(nLen));
str.ReleaseBuffer();
return szRs;
}
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13、函数：THCARToChar
描述：将TCHAR*转换为char *
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char * THCARToChar (TCHAR* tchStr)
{
int nLen = 2*wcslen(tchStr);//CString,TCHAR 汉字算一个字符，因此不用普通计算 长度
char* chRtn = new char[nLen +1]
wcstombs(chRtn,tchStr,nLen +1);// 转换成功返回为非负值
return chRtn;
}
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14、函数：GetAnsiString
描述：将 CString （ unicode ）转换为 char*(ANSI)
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char* GetAnsiString(const CString &s)
{
int nSize = 2*s.GetLength();
char *pAnsiString = new char[nSize+1];
wcstombs(pAnsiString, s, nSize+1);
return pAnsiString;
}
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15、 描述：将const char * 转换为CString
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CString TransLPCSTRToCString(const char *)
{
int len = strlen(pErrMsg);
TCHAR* c1 = (TCHAR*)malloc(sizeof(TCHAR)*len);
MultiByteToWideChar( CP_ACP , 0 , pErrMsg , len+1 , c1 , len+1);
csText.Format(L"%s",pErrMsg);
retrun csText;
}
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16、函数：CStringToLPCSTR
描述：将CString转换为const char *
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const char* CStrToLPCTSTR(CString strSrc)
{
DWORD dwNum = WideCharToMultiByte(CP_OEMCP, NULL, strSrc.GetBuffer(0), -1, NULL, 0, NULL, FALSE);
char *psText;
psText = new char[dwNum];
if (!psText)
delete []psText;
WideCharToMultiByte(CP_OEMCP, NULL, strSrc.GetBuffer(0), -1, psText, dwNum, NULL, FALSE);
return (const char*)psText;
}
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17、函数：WCharToUTF8
描述：将const TCHAR*(LPCTSTR)转换为CHAR *(LPTSTR)
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std::string WCharToUTF8(LPCTSTR wszBuffer)
{
UINT nLen = WideCharToMultiByte(CP_UTF8,0,wszBuffer,-1,NULL,0,NULL,NULL);
CHAR* szAscii = new CHAR[nLen+1];
WideCharToMultiByte(CP_UTF8, NULL, wszBuffer,-1, szAscii, nLen, NULL, NULL);
std::string ret = szAscii;
delete[] szAscii;
return ret;
}
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18、函数：UTF8ToChar
描述：将CHAR *(LPTSTR)转换为const TCHAR*(LPCTSTR)
*******************************************************std::string UTF8ToChar(LPCSTR szUTF8)
{
UINT nLen = MultiByteToWideChar(CP_UTF8, NULL, szUTF8, -1, NULL, NULL);
WCHAR *wszBuffer = new WCHAR[nLen+1];
nLen = MultiByteToWideChar(CP_UTF8,NULL,szUTF8,-1,wszBuffer,nLen);
wszBuffer[nLen] = '\0';
nLen = WideCharToMultiByte(CP_ACP,0,wszBuffer,-1,NULL,0,NULL,NULL);
CHAR* szAscii = new CHAR[nLen+1];
WideCharToMultiByte(CP_ACP,NULL,wszBuffer,-1,szAscii,nLen,NULL,NULL);
szAscii[nLen]='\0';
std::string ret = szAscii;
//清理内存
delete[] wszBuffer;
delete[] szAscii;
return ret;
}
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19、将CString转LPWSTR(即wchar_*)
USES_CONVERSION;
LPWSTR lpwStr = A2W(m_csUserName);
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20、将CString转LPWSTR(即wchar_*)
USES_CONVERSION;
LPWSTR lpwStr = A2W(m_csUserName);
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