windows 如何对 TCHAR 进行子串
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How can I substring a TCHAR
提问by Simsons
I have a TCHAR and value as below:
我有一个 TCHAR 和值如下：
TCHAR szDestPathRoot[MAX_PATH]="String This";
Now I want the 1st three character from TCHAR , like below:
现在我想要 TCHAR 的第一个三个字符，如下所示：
szDestPathRoot.substring(0,2);
How can I do this.
我怎样才能做到这一点。
回答by paulsm4
TCHAR[]is a simple null-terminated array (rather than a C++ class). As a result, there's no ".substring()" method.
TCHAR[]是一个简单的以空字符结尾的数组（而不是 C++ 类）。因此，没有“.substring()”方法。
TCHAR[](by definition) can either be a wide character string (Unicode) or a simple char string (ASCII). This means there are wcsand strequivalents for each string function (wcslen()vs strlen(), etc etc). And an agnostic, compile-time TCHARequivalent that can be either/or.
TCHAR[]（根据定义）可以是宽字符串 (Unicode) 或简单字符字符串 (ASCII)。此装置有wcs和str等同物对于每个字符串功能（wcslen()VS strlen()，等等等等）。和一个不可知的，编译时TCHAR等价物，可以是/或。
The TCHARequivalent of strncpy()is tcsncpy().
该TCHAR等效strncpy()IS tcsncpy()。
Final caveat: to declare a TCHARliteral, it's best to use the _T()macro, as shown in the following snippet:
最后的警告：要声明TCHAR文字，最好使用_T()宏，如以下代码段所示：
TCHAR szDestPathRoot[MAX_PATH] = _T("String This");
TCHAR szStrNew[4];
_tcsncpy (str_new, szTestPathRoot, 3);
You may find these links to be of interest:
您可能会发现这些链接很有趣：
回答by tidwall
TCHAR szDestPathRoot[MAX_PATH]="String This";
TCHAR substringValue[4] = {0};
memcpy(substringValue, szDestPathRoot, sizeof(TCHAR) * 3);
回答by Alex Jasmin
This is somewhat ugly but if you know for sure that:
这有点难看，但如果你确定：
- The string holds at least 4 TCHAR (3 chars plus the terminating NUL)
- The content of the string can be modified (which is the case in your example).
- You don't have to keep the original string intact
- 该字符串至少包含 4 个 TCHAR（3 个字符加上终止的 NUL）
- 可以修改字符串的内容（在您的示例中就是这种情况）。
- 您不必保持原始字符串完好无损
You could just put a terminating NUL at the 4th position to make the string 3 char long.
您可以在第 4 个位置放置一个终止 NUL 以使字符串长度为 3 个字符。
szDestPathRoot[3] = _T('std::wstring strDestPathRoot( _T("String This") );
strDestPathRoot.substr( 0, 2 );
');
Note that this operation is destructive to the original string
注意这个操作对原始字符串是破坏性的
You should really be using a string class in C++ code though.
不过，您确实应该在 C++ 代码中使用字符串类。
回答by Flinsch
As you have tagged your question with "C++" you can use the string classes of the std library:
当您用“C++”标记您的问题时，您可以使用 std 库的字符串类：
##代码##