使用 strcpy_s 作为 TCHAR 指针(Microsoft 特定) [英] using strcpy_s for TCHAR pointer (Microsoft Specific)

问题描述

我想知道哪种方法是正确的?

I was wondering which is the correct way?

_tcscpy(tchar_pointer, _tcslen(tchar_pointer), _T("Hello World"));

或

_tcscpy(tchar_pointer, _tcsclen(tchar_pointer), _T("Hello World"));

或

_tcscpy(tchar_pointer, ???, _T("Hello World"));

推荐答案

tchar 指针来自外部，我这边不知道指针引用的缓冲区有多大

the tchar pointer are coming from external, and my side has no idea how large the buffer referred by the pointer is

如果是这样，那么这些都不是你想要的.

所有安全"函数的工作方式是告诉他们目标缓冲区有多大.

The way all the "safe" functions work is that you tell them how big the target buffer is.

你不知道吗?您不能使用这些功能.

You don't know? You can't use those functions.

int buffer_size = _tcslen(xxx) * sizeof(TCHAR)

这不起作用.它将保证复制的字符串不长于缓冲区中已有的字符串.如果缓冲区没有被初始化，就会失败；如果缓冲区以 '\0' 开头，则不会复制任何内容；等等.

This will not work. All it will guarantee is that the string copied is not longer than whatever is already in the buffer. If the buffer has not been initialized, it will fail; if the buffer begins with a '\0', nothing will be copied; and so forth.

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