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:

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   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);

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UNICODE 到 ANSI:

UNICODE大多数情况下被OLE函数返回， 像这个

代码:

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HRESULT SomeOLEFunction(BSTR &bstr)

{

   bstr = ::SysAllocString(L"Hello");

   return S_OK;

}

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这个转换用WideCharToMultiByte()函数完成

代码:

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    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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