在cpp中将字符串转换为_T [英] convert string to _T in cpp

问题描述

我想将 string 或 char * 转换为 _T 但不能。

I want to convert string or char* to the _T but not able to do.

如果我写

_tcscpy(cmdline,_T ("hello world")); 

它工作得很好，但如果我写

it works perfectly, but if i write

char* msg="hello world";
_tcscpy(cmdline,_T (msg));

它显示错误如：错误C2065：'Lmsg'：undeclared identifier

it shows an error like: error C2065: 'Lmsg' : undeclared identifier

请给我一个解决方案。

Thanx提前。

推荐答案

_T 是一个宏，定义为（if UNICODE ）：

_T is a macro, defined as (if UNICODE is defined):

#define _T(a)  L ## a

它只能与字符串文字一起使用。因此，当你写 _T（hi）它会变成 Lhi但是当你写 _T（msg）它会变成 Lmsg 这是一个未定义的标识符，你不打算

which can work only with string-literals. So when you write _T("hi") it becomes L"hi" which is valid, as expected. But when you write _T(msg) it becomes Lmsg which is an undefined identifier, and you didn't intend that.

所有您需要的是此函数 mbstowcs as：

All you need is this function mbstowcs as:

const char* msg="hello world"; //use const char*, instead of char*
wchar_t *wmsg = new wchar_t[strlen(msg)+1]; //memory allocation
mbstowcs(wmsg, msg, strlen(msg)+1);

//then use wmsg instead of msg
_tcscpy(cmdline, wmsg);

//memory deallocation - must do to avoid memory leak!
 delete []wmsg;

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