#include<string>//標(biāo)準(zhǔn)C++；

string   tp;
wchar_t   *s;
char   *d;
tp=s;
d=tp.c_str();
也可使用WideCharToString(wchar_t   *   Source);函數(shù)轉(zhuǎn)換

WideCharToMultiByte

MultiByteToWideChar

LPSTR = char *
LPCSTR = const char *
LPWSTR = wchar_t *
LPCWSTR = const wchar_t *
LPOLESTR = OLECHAR * = BSTR = LPWSTR(Win32)
LPCOLESTR = const OLECHAR * = LPCWSTR(Win32)
LPTSTR = _TCHAR *
LPCTSTR = const _TCHAR *

char 和 wchar_t相互轉(zhuǎn)化

C代碼

1. #include <windows.h>
2. #include <stdio.h>
4. //function: charTowchar
5. //purpose:char to WCHAR 、wchar_t、LPWSTR etc
6. void charTowchar(const char *chr, wchar_t *wchar, int size)  
7. {     
8.     MultiByteToWideChar( CP_ACP, 0, chr,  
9.         strlen(chr)+1, wchar, size/sizeof(wchar[0]) );  
10. }  
12. //function: wcharTochar
13. //purpose:WCHAR 、wchar_t、LPWSTR to char
14. void wcharTochar(const wchar_t *wchar, char *chr, int length)  
15. {  
16.     WideCharToMultiByte( CP_ACP, 0, wchar, -1,  
17.         chr, length, NULL, NULL );  
18. }  
20. int main (void)  
21. {  
22. char     chr[128];  
23. wchar_t  *wchar = L"陳鴻欽";  
26. //wchar_t to char
27.     wcharTochar(wchar, chr, sizeof(chr));  
28.     printf("char is %s/n", chr);  
30. //char to wchar_t
31.     wchar = (wchar_t *)malloc(sizeof(wchar_t) * 64);  
32.     charTowchar(chr, wchar, sizeof(wchar_t) * 64);  
34.     wprintf_s(L"%s/n", wchar);//
35.     getchar();  
37. return 0;  
38. } 

函數(shù)原型：
int WideCharToMultiByte(
  UINT CodePage,
  DWORD dwFlags,
  LPCWSTR lpWideCharStr,
  int cchWideChar,
  LPSTR lpMultiByteStr,
  int cbMultiByte,
  LPCSTR lpDefaultChar,   
  LPBOOL lpUsedDefaultChar
);

參數(shù)說明：
1、CodePage
指定要轉(zhuǎn)換成的字符集代碼頁(yè)，它可以是任何已經(jīng)安裝的或系統(tǒng)自帶的字符集，可以選擇以下的代碼頁(yè)：
CP_ACP         //當(dāng)前系統(tǒng)ANSI代碼頁(yè)
CP_MACCP       //當(dāng)前系統(tǒng)Macintosh代碼頁(yè)
CP_OEMCP       //當(dāng)前系統(tǒng)OEM代碼頁(yè)，一種原始設(shè)備制造商硬件掃描碼
CP_SYMBOL      //Symbol代碼頁(yè)，用于Windows 2000及以后版本
CP_THREAD_ACP  //當(dāng)前線程ANSI代碼頁(yè)，用于Windows 2000及以后版本
CP_UTF7  //UTF-7，設(shè)置此值時(shí)lpDefaultChar和lpUsedDefaultChar都必須為NULL
CP_UTF8  //UTF-8，設(shè)置此值時(shí)lpDefaultChar和lpUsedDefaultChar都必須為NULL

2、dwFlags
指定如何處理沒有轉(zhuǎn)換的字符，一般情況下設(shè)為0
WC_NO_BEST_FIT_CHARS  //把不能直接轉(zhuǎn)換成相應(yīng)多字節(jié)字符的Unicode字符轉(zhuǎn)換成lpDefaultChar指定的默認(rèn)字符。
WC_COMPOSITECHECK     //把合成字符轉(zhuǎn)換成預(yù)制的字符。它可以與后三個(gè)選項(xiàng)中的任何一個(gè)組合使用，如果沒有與他們中的任何一個(gè)組合，則與選項(xiàng)WC_SEPCHARS相同。
WC_ERR_INVALID_CHARS  //此選項(xiàng)會(huì)致使函數(shù)遇到無效字符時(shí)失敗返回，并且GetLastError會(huì)返回錯(cuò)誤碼ERROR_NO_UNICODE_TRANSLATION。否則函數(shù)會(huì)自動(dòng)丟棄非法字符。此選項(xiàng)只能用于UTF8
WC_DISCARDNS      //轉(zhuǎn)換時(shí)丟棄不占空間的字符，與WC_COMPOSITECHECK一起使用
WC_SEPCHARS       //轉(zhuǎn)換時(shí)產(chǎn)生單獨(dú)的字符，此是默認(rèn)轉(zhuǎn)換選項(xiàng)，與WC_COMPOSITECHECK一起使用
WC_DEFAULTCHAR    //轉(zhuǎn)換時(shí)使用默認(rèn)字符代替例外的字符，(最常見的如"?")，與WC_COMPOSITECHECK一起使用

3、lpWideCharStr  //要轉(zhuǎn)換的寬字符串
4、cchWideChar    //要轉(zhuǎn)換寬字符串的長(zhǎng)度，-1表示轉(zhuǎn)換到字符串結(jié)尾
5、lpMultiByteStr //接收轉(zhuǎn)換后輸出的字符串的緩沖區(qū)
6、cbMultiByte    //輸出緩沖區(qū)大小，如果為0，lpMultiByteStr將被忽略，函數(shù)將返回所需緩沖區(qū)大小而不使用lpMultiByteStr。
7、lpDefaultChar  //指向字符的指針，在指定編碼里找不到相應(yīng)字符時(shí)使用此字符作為默認(rèn)字符代替，如果為NULL則使用系統(tǒng)默認(rèn)字符
8、lpUsedDefaultChar  //開關(guān)變量的指針，用以表明是否使用過默認(rèn)字符，可設(shè)為NULL

返回值：為0表示調(diào)用失敗

下面就來看看如何將wstring和wchar_t*轉(zhuǎn)換為string和char*
wstring轉(zhuǎn)換為string：
wstring wstr=_T("翔翔糖糖");
int size=WideCharToMultiByte(CP_ACP,0,wstr.c_str(),-1,NULL,0,NULL,NULL);
char *ch=new char[size+1];
if(!WideCharToMultiByte(CP_ACP,0,wstr.c_str(),-1,ch,size,NULL,NULL))
{
    return false;
}
string str=ch;

wchar_t*轉(zhuǎn)換為char*：
wchar_t *wch=_T("翔翔糖糖");
int size=WideCharToMultiByte(CP_ACP,0,wch,-1,NULL,0,NULL,NULL);
char *ch=new char[size+1];
if(!WideCharToMultiByte(CP_ACP,0,wch,-1,ch,size,NULL,NULL))
{
    return false;
}

wchar_t* wstr = L"A wide character string.";

char* ascii = new char[wcslen(wstr) + 1];

wcstombs( ascii, wstr, wcslen(wstr) );

另一種方法：                                                                                                                           char* localeInfo;                                                                                                                 wchar_t *pwchello = L"/x3042/x3043"; // 2 Hiragana characters                                       wchar_t *pwc;

wchar_t*轉(zhuǎn)換為char*:                                                                                                        size_t size;                                                                                                                            int requiredSize;                                                                                                                   requiredSize = wcstombs( NULL, pwchello, 0);                                                                    pmbhello = (unsigned char *)malloc( requiredSize + 1);                                               size = wcstombs( pmbhello, pwchello, requiredSize + 1);

char* 轉(zhuǎn)換為 wchar_t*                                                                                                       size_t size;                                                                                                                            int requiredSize;                                                                                                                   requiredSize = mbstowcs(NULL, pmbhello, 0);                                                                     pwc = (wchar_t *)malloc( (requiredSize + 1) * sizeof( wchar_t ));                                       size = mbstowcs( pwc, pmbhello, requiredSize + 1);

請(qǐng)問怎么樣把string轉(zhuǎn)換到LPCTSTR

std::string   str;
LPCTSTR   lpstr   =   (LPCTSTR)str.c_str();