wchar_t*,wchar_t,wchat_t數組,char,char*,char數組,std::string,std::wstring,CString....
#include <string>
// 使用CString必須使用MFC，并且不可包含<windows.h>
#define _AFXDLL
#include <afx.h>
using namespace std;
//----------------------------------------------------------------------------------
//將 單字節char* 轉換為 寬字節 wchar*
inline wchar_t* AnsiToUnicode( const char* szStr )
{
int nLen = MultiByteToWideChar( CP_ACP, MB_PRECOMPOSED, szStr, -1, NULL, 0 );
if (nLen == 0)
{
return NULL;
}
wchar_t* pResult = new wchar_t[nLen];
MultiByteToWideChar( CP_ACP, MB_PRECOMPOSED, szStr, -1, pResult, nLen );
return pResult;
}
//----------------------------------------------------------------------------------
// 將 寬字節wchar_t* 轉換 單字節char*
inline char* UnicodeToAnsi( const wchar_t* szStr )
{
int nLen = WideCharToMultiByte( CP_ACP, 0, szStr, -1, NULL, 0, NULL, NULL );
if (nLen == 0)
{
return NULL;
}
char* pResult = new char[nLen];
WideCharToMultiByte( CP_ACP, 0, szStr, -1, pResult, nLen, NULL, NULL );
return pResult;
}
//----------------------------------------------------------------------------------
// 將單字符 string 轉換為寬字符 wstring
inline void Ascii2WideString( const std::string& szStr, std::wstring& wszStr )
{
int nLength = MultiByteToWideChar( CP_ACP, 0, szStr.c_str(), -1, NULL, NULL );
wszStr.resize(nLength);
LPWSTR lpwszStr = new wchar_t[nLength];
MultiByteToWideChar( CP_ACP, 0, szStr.c_str(), -1, lpwszStr, nLength );
wszStr = lpwszStr;
delete [] lpwszStr;
}
//----------------------------------------------------------------------------------
int _tmain(int argc, _TCHAR* argv[])
{
char*? pChar = "我喜歡char";
wchar_t* pWideChar = L"我討厭wchar_t";
wchar_t? tagWideCharList[100] ;
char? ch = 'A';
char? tagChar[100] = {NULL};
CString? cStr;
std::string str;

// 注：設置語言環境以便輸出WideChar
setlocale(LC_ALL,"chs");

// 注： char* 轉換 wchar_t*
// 注： wchar_t 未重載 << ，所以不可使用 cout << 輸出
pWideChar = AnsiToUnicode( pChar );
// 注：printf("%ls") 和 wprintf(L"%s") 一致
printf( "%ls\n", pWideChar );

// 注：wchar_t* 轉換 wchar_t[]
wcscpy ( tagWideCharList, pWideChar );
wprintf( L"%s\n", tagWideCharList );

// 注：wchar_t[] 轉換 wchar_t*
pWideChar = tagWideCharList;
wprintf( L"%s\n", pWideChar );

// 注：char 轉換 string
str.insert( str.begin(), ch );
cout << str << endl;

// 注：wchar_t* 轉換 string
pWideChar = new wchar_t[str.length()];
swprintf( pWideChar, L"%s", str.c_str());
wprintf( L"%s\n", pWideChar );

// 注：string 轉換 char*
pChar = const_cast<char*>(str.c_str());
cout << pChar << endl;

// 注：char* 轉換 string
str = std::string(pChar);
// 注： cout 的 << 重載了string, 若printf 的話必須 printf("%s", str.c_str());
//? 而不可 print( "%s", str ); 因為 str 是個 string 類
cout << str << endl;

// 注：string 轉換 char[]
str = "無聊啊無聊";
strcpy( tagChar, str.c_str() );
printf( "%s\n", tagChar );

// 注：string 轉換 CString;
cStr = str.c_str();

// 注：CString 轉換 string
str = string(cStr.GetBuffer(cStr.GetLength()));

// 注：char* 轉換 CString
cStr = pChar;

// 注：CString 轉換 char*
pChar = cStr.GetBuffer( cStr.GetLength() );

// 注：CString 轉換 char[]
strncpy( tagChar, (LPCTSTR)CString, sizeof(tagChar));

// 注：CString 轉換 wchar_t*
pWideChar = cStr.AllocSysString();
printf( "%ls\n", pWideChar );
}

____________________________________________________________________________________________

CString 轉 wchar_t
CString path = "asdf";
wchar_t wstr[256] = path.AllocSysString();
或者：
wchar_t wcstring[256];
MultiByteToWideChar(CP_ACP,0,path,-1,wcstring,256);
wchar_t轉CString
WideCharToMultiByte(CP_ACP,0,wcstring,256,
path.GetBuffer(0),256,NULL,NULL);
path.ReleaseBuffer(0);
string 轉 CString
CString.format("%s", string.c_str());
char 轉 CString
CString.format("%s", char*);
char 轉 string
string s(char *);
string 轉 char *
char *p = string.c_str();
CString 轉 string
string s(CString.GetBuffer());
CString str = "fdjfdas";
string s = (LPCTSTR)str;
1，string -> CString
CString.format("%s", string.c_str());
用c_str()確實比data()要好.
2，char -> string
string s(char *);
你的只能初始化，在不是初始化的地方最好還是用assign().
3,CString -> string
string s(CString.GetBuffer());
GetBuffer()后一定要ReleaseBuffer(),否則就沒有釋放緩沖區所占的空間.

轉載于:https://www.cnblogs.com/sea918/archive/2010/07/02/1770192.html

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