字符串： 怎样在ANSI 和 UNICODE间做转换

字符串： 怎样在ANSI 和 UNICODE间做转换

问题: 怎样在ANSI 和 UNICODE间做转换？

答案:

这个答案启发自 Yves M贴出的一张回复（reply）

ANSI 到 UNICODE:

这个转换用函数MultiByteToWideChar()完成

代码:
--------------------------------------------------------------------------------
   char *ansistr = "Hello";
   int a = lstrlenA(ansistr)+1;
   BSTR unicodestr = SysAllocStringLen(NULL, 2*a);
   MultiByteToWideChar(CP_ACP, 0, ansistr, a, unicodestr, a);
   AfxMessageBox(CString(unicodestr), MB_OK, 0); //displays "Hello"
   //... when done, free the BSTR
   SysFreeString(unicodestr);
--------------------------------------------------------------------------------

UNICODE 到 ANSI:

UNICODE大多数情况下被OLE函数返回， 像这个

代码:
--------------------------------------------------------------------------------
HRESULT SomeOLEFunction(BSTR &bstr)
{
   bstr = ::SysAllocString(L"Hello");
   return S_OK;
}
--------------------------------------------------------------------------------

这个转换用WideCharToMultiByte()函数完成

代码:
--------------------------------------------------------------------------------
    BSTR unicodestr;
    SomeOLEFunction(unicodestr);
    int a = SysStringLen(unicodestr)+1;
    char *ansistr = new char[a];
    WideCharToMultiByte(CP_ACP,
                        0,
                        unicodestr,
                        -1,
                        ansistr,
                        a,
                        NULL,
                        NULL);
    AfxMessageBox(ansistr, MB_OK, 0); // will display "Hello"
    //...use the strings, then free their memory:
    delete[] ansistr;
    SysFreeString(unicodestr);
--------------------------------------------------------------------------------

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