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author: love02xp
title: Unicode编码下字符串相互转换
date: 2016-07-10 15:45:20
category: [编程代码]
tags: [学习,编程]


#####[阅读原文](http://blog.csdn.net/one_in_one/article/details/26346137)


1、Unicode编码下CString转为char*


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方法一:使用API:WideCharToMultiByte进行转换
[cpp] view plain copy
<span style="font-size:18px;">#include <afx.h>  
  
int _tmain(int argc, _TCHAR* argv[])  
{  
    CString cstr = _T("test测试");  
      
    //获取宽字节字符的大小,大小是按字节计算的  
    int len = WideCharToMultiByte(CP_ACP,0,cstr,cstr.GetLength(),NULL,0,NULL,NULL);  
  
  
    //为多字节字符数组申请空间,数组大小为按字节计算的宽字节字节大小  
    char * pbuffer = new char[len+1];   //以字节为单位  
  
  
    //宽字节编码转换成多字节编码  
    WideCharToMultiByte(CP_ACP,0,cstr,cstr.GetLength(),pbuffer,len,NULL,NULL);  
  
  
    pbuffer[len] = '\0';   
  
  
    if (pbuffer)  
    {  
        delete [] pbuffer;  
        pbuffer = NULL;  
    }  
  
  
    return 0;  
}</span>  


方法二:使用函数:T2A、W2A

[cpp] view plain copy
<span style="font-size:18px;">#include   <afxpriv.h>  
  
int _tmain(int argc, _TCHAR* argv[])  
{  
    CString cstr = _T("test测试");  
  
  
    //声明标识符  
    USES_CONVERSION;  
  
  
    char *pbuffer = T2A(cstr);     
    char *pbuf = W2A(cstr);  
  
  
    return 0;  
}</span>  
2、Unicode下char *转换为CString

方法一:使用API:MultiByteToWideChar进行转换
[cpp] view plain copy
<span style="font-size:18px;">#include <afx.h>  
  
  
int _tmain(int argc, _TCHAR* argv[])  
{  
    char * pchar = "test测试";  
      
    int charLen = strlen(pchar);//计算char *数组大小,以字节为单位,一个汉字占两个字节  
      
    int len = MultiByteToWideChar(CP_ACP,0,pchar,charLen,NULL,0);//计算多字节字符的大小,按字符计算。  
      
    TCHAR *buf = new TCHAR[len + 1];//为宽字节字符数组申请空间,数组大小为按字节计算的多字节字符大小  
  
  
    MultiByteToWideChar(CP_ACP,0,pchar,charLen,buf,len);//多字节编码转换成宽字节编码  
  
  
    buf[len] = '\0';  
  
  
    //将TCHAR数组转换为CString  
    CString pWideChar;  
    pWideChar.Append(buf);  
  
  
    if(buf)  
    {  
        delete [] buf;  
        buf = NULL;  
    }  
  
  
    return 0;  
}</span>  

方法二:使用函数:A2T、A2W
[cpp] view plain copy
<span style="font-size:18px;">#include <afx.h>  
  
int _tmain(int argc, _TCHAR* argv[])  
{  
    char * pchar = "test测试";  
  
    USES_CONVERSION;  
  
    CString cstr = A2T(pchar);  
    CString cstr1 = A2W(pchar);   
  
    return 0;  
}</span>  

方法三:使用_T宏,将字符串转换为宽字符
书写代码使用TEXT("")或_T(""),文本在UNICODE和非UNICODE程序里都通用
[cpp] view plain copy
<span style="font-size:18px;">#include <afx.h>  
  
int _tmain(int argc, _TCHAR* argv[])  
{  
    CString cstr = _T("test测试");  
    CString cstr1 = "test测试";  
  
    return 0;  
}</span>  
3、将char*转化为wchar_t*

[cpp] view plain copy
<span style="font-size:18px;">#include <afx.h>  
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;  
}</span>  
4、将wchar_t*转化为char*

[cpp] view plain copy
#include <afx.h>  
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;  
}  
5、BSTR转换成char*

[cpp] view plain copy
<span style="font-size:18px;">方法一,使用ConvertBSTRToString。例如:  
char* lpszText2 = _com_util::ConvertBSTRToString(bstrText);  
SysFreeString(bstrText); // 用完释放  
delete[] lpszText2;    
  
方法二,使用_bstr_t的赋值运算符重载。例如:  
_bstr_t b = bstrText;  
char* lpszText2 = b; </span>  

6、char*转换成BSTR

[cpp] view plain copy
方法一,使用SysAllocString等API函数。例如:  
BSTR bstrText = ::SysAllocString(L"test测试");  
  
方法二,使用COleVariant或_variant_t。例如:  
_variant_t strVar("test测试");   
BSTR bstrText = strVar.bstrVal;   
  
方法三,使用_bstr_t。例如:  
BSTR bstrText = _bstr_t("test测试");   
  
方法四,使用CComBSTR。例如:  
BSTR bstrText = CComBSTR("test测试");  
或  
CComBSTR bstr("test测试");  
BSTR bstrText = bstr.m_str;   
  
方法五,使用ConvertStringToBSTR。例如:  
char* lpszText = "test测试";   
BSTR bstrText = _com_util::ConvertStringToBSTR(lpszText);   

7、CString转换成BSTR
[cpp] view plain copy
通常是通过使用CStringT::AllocSysString来实现。例如:  
CString str("test测试");  
BSTR bstrText = str.AllocSysString();  
SysFreeString(bstrText); // 用完释放  

8、BSTR转换成CString

[cpp] view plain copy
<span style="font-size:14px;">BSTR bstrText = ::SysAllocString(L"test测试");   
CStringA str;  
str.Empty();  
str = bstrText;   
或  
CStringA str(bstrText);</span>