减少LPWSTR中的字符并将其另存为LPCWSTR [英] reduce characters from LPWSTR and save it as LPCWSTR

问题描述

你好，
我有一个另存为LPWSTR的字符串.
我必须对此字符串进行更改(减少一些字符)并将其另存为LPCWSTR.
我该怎么办?

谢谢

Hello,
I have a string saved as LPWSTR.
I have to make a change in this string (reduce some characters) and save it as LPCWSTR.
How can i do it?

Thanks

推荐答案

您不需要从非常量字符串到常量字符串的任何转换.显然，它们在所需的分配方向上兼容.让我们看看:

You don''t need any conversion from non-constant to constant string. Apparently, they are compatible in the assignment direction you want. Let''s see:

#include <windows.h>

//...

LPWSTR variable = L"my string";
variable[0] = 'M';
LPCWSTR constString = variable;

如果您需要执行相反操作，则需要强制类型转换，因为这将打破关于字符串数据不可更改的假设.有两种方法:

If you need to do the opposite, type cast is needed, because it would break the assumption on the string data being immutable. There are two ways:

LPWSTR newString = (LPWSTR)constString;
LPWSTR newString2 = const_cast<LPWSTR>(constString);

—SA

—SA

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