在Win32 DLL中使用WCHAR [英] Using WCHAR in a Win32 Dll

问题描述

我有一个Win32库，字符集预设为 - 使用Unicode字符集，我想使用WCHAR数组来存储字符串文字常量。

例如：

 WCHAR string [] =MyWideCharString; 

当我编译代码时，我收到错误，指出：

 错误  1  错误 C2440：' 初始化'：无法从'const char [17]'转换为'WCHAR []'14  

我也尝试使用_T宏，但我又遇到了编译错误：

 错误  1  错误 C3861：'  _ T'：标识符不发现14  

那么如何我可以在库中使用WCHAR字符数组吗？

解决方案

问题是字符串文字的语法。类型 WCHAR 是字符类型 wchar_t ;此类型的字符串文字应以L为前缀：

 WCHAR string [] = L   MyWideCharString; 

您还可以使用便携式声明样式：

 _ TCHAR string [] = _T（  MyWideCharString）; 

这里， _TCHAR 和 _T 只是宏，它依赖于 _UNICODE 的定义。他们进行类型声明 char 或 w_char 和字符串文字L-prefixed或not，允许你切换从非Unicode（ANSI）到Unicode版本的相同代码。这样，使用宏的类型声明和字符串文字在任何一种情况下都保持一致。



参见 http://msdn.microsoft.com/en-us/library/dybsewaf（v = VS.100）的.aspx [< a href =http://msdn.microsoft.com/en-us/library/dybsewaf(v=VS.100).aspx\"target =_ blanktitle =New Window> ^ ]。



基于 _TCHAR 的以空值终止的可移植字符串类型为 LPTSTR 和 LPCTSTR ，请参阅

http://stackoverflow.com/questions/321413/lpcstr-lpctstr-and-lptstr [ ^ ]。

-SA

WCHAR string [] = TEXT（MyWideCharString）;

Hi,

I have a Win32 library for which the character set is preset to - Use Unicode Character Set and I want to use a WCHAR array for storing a string literal constant.
For example:

WCHAR string[] = "MyWideCharString";

When I compile the code I get the error that states:

Error   1   error C2440: 'initializing' : cannot convert from 'const char [17]' to 'WCHAR []'   14

I tried using _T macro also,but I got a compile error again:

Error   1   error C3861: '_T': identifier not found 14

So how can I use the WCHAR character arrays in my library?

解决方案

The problem is the syntax for a string literal. The type WCHAR is the character type wchar_t; the string literal for this type should be prefixed with "L":

WCHAR string[] = L"MyWideCharString";

[EDIT]
You can also use portable declaration style:

_TCHAR string[] = _T("MyWideCharString");

Here, _TCHAR and _T are just macro which works depending the definition of _UNICODE. They make type declaration either char or w_char and the string literal either L-prefixed or not, which allows you to switch from non-Unicode (ANSI) to Unicode version of the same code. This way, the type declarations and string literal using the macro remain consistent in either case.

See http://msdn.microsoft.com/en-us/library/dybsewaf(v=VS.100).aspx[^].

Null-terminated portable string types based on _TCHAR are LPTSTR and LPCTSTR, see
http://stackoverflow.com/questions/321413/lpcstr-lpctstr-and-lptstr[^].

—SA

WCHAR string[] = TEXT("MyWideCharString");

这篇关于在Win32 DLL中使用WCHAR的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！