一、char转 TCHAR
char a[124];
TCHAR b[124];
MultiByteToWideChar(CP_ACP, 0, a , -1, b , 128);

二、TCHAR 转string
TCHAR * STR =new TCHAR[1200];
std::string TCHAR2STRING(TCHAR * STR
{
 int iLen = WideCharToMultiByte(CP_ACP, 0, STR , -1, NULL, 0, NULL, NULL);
 char* chRtn =new char[iLen*sizeof(char)];
 WideCharToMultiByte(CP_ACP, 0, STR , -1, chRtn , iLen , NULL, NULL);
std::string str (chRtn);
return str;
}
三、string转TCHAR
std::string  m_csFileName  = std::string("hello");  
TCHAR  wc [MAX_PATH];  
#ifdef UNICODE  
 _stprintf_s(wc, MAX_PATH, _T("%S"),  m_csFileName.c_str() );//%S宽字符  
#else  
 _stprintf_s(wc, MAX_PATH, _T("%s"),  m_csFileName.c_str() );//%s单字符  
#endif 
四、TCHAR 转char
TCHAR * str =new TCHAR[1200];
LPSTR pszOut = NULL;
int nInputStrLen = wcslen (str);
int nOutputStrLen = WideCharToMultiByte (CP_ACP, 0, str , nInputStrLen, NULL, 0, 0, 0) + 2;
pszOut = new char [nOutputStrLen];
memset (pszOut, 0x00, nOutputStrLen);
WideCharToMultiByte(CP_ACP, 0, str , nInputStrLen, pszOut , nOutputStrLen, 0, 0);
fprintf(fp,"%s", pszOut) ;
五、CString转TCHAR*
CString->TCHAR*的转化可以用函数GetBuff()
函数原型为:LPTSTR GetBuffer( int nMinBufLength );
CString str("CString");
 TCHAR* szMsg = new TCHAR[100];
 //其参数为CString字符串的长度
 szMsg = str.GetBuffer(str.GetLength());
 str.ReleaseBuffer();
 delete []szMsg;
 szMsg = NULL;
六、TCHAR*转CString
TCHAR szTchar[18] = L"TCHAR";   
 CString  str;   
 str.Format(_T("%s"),szTchar); 
七、CString转char
CString str=_T("你好");
char ch[4];
for(int i=0;i<str.GetLength();i++)
{
ch[i]=str.GetAt(i);
}

例: char str2[120]={0};
for(int i=0;i<pDoc->m_CustomSet->strTime1.GetLength();i++)
{
str2[i]=pDoc->m_CustomSet->strTime1.GetAt(i);
}
char str3[120]={0};
strcpy(str3,mWYF_V_SENSOR_NODE[i].name);
char *cat=strcat( str3,str2);

八、CString 转char*
CString filePath = openFileDlg.GetPathName();
FILE *fp;
char * pNumber =new char[256];
WideCharToMultiByte(CP_ACP,0,filePath,-1,pNumber,256,NULL,NULL );
fp=fopen(pNumber,"w+");

九、char*转CString
char *str ="aaaa"   
CString  str1(str);  
十、int 转cstring
int i =100;   CString str;   str.Format("%d",i);  // str.Format( _T("%d") ,i ); 
十一、枚举类型转换为字符串
static inline char* weather_str(enum Enum_weather w) //枚举类型转化为char*
{
char *strings[] = {"Rainy", "Snowy", "Cloudy", "Sunny",};
return strings[w];
}