vc2005提示std::copy()不安全。安全版本怎么写？

[zxcdewq]

如题

[cdpc0202]

提示的同时应该会告诉你安全的是哪个。

[DavidHsing]

StringCchCopyN
StringCbCopyN

[DavidHsing]

StringCchCopyN is a replacement for strncpy. StringCchCopyN copies a given number of characters from a source string. The size, in characters, of the destination buffer is provided to the function to ensure that StringCchCopyN does not write past the end of this buffer.

Syntax

HRESULT StringCchCopyN( LPTSTR pszDest,
size_t cchDest,
LPCTSTR pszSrc,
size_t cchSrc
);
Parameters

pszDest
[out] Pointer to a buffer which receives the copied characters.
cchDest
[in] Size of pszDest, in characters. This value must be large enough to hold the copied characters (the length of pszSrc or the value of cchSrc, whichever is smaller) plus 1 to account for the terminating null character. The maximum number of characters allowed is STRSAFE_MAX_CCH.
pszSrc
[in] Pointer to a buffer containing the source string. This source string must be null-terminated.
cchSrc
[in] The maximum number of characters to copy from pszSrc to pszDest.
Return Value

Note that this function returns an HRESULT as opposed to strncpy, which returns a pointer. It is strongly recommended that you use the SUCCEEDED and FAILED macros to test the return value of this function.

S_OK Source data was present, the characters were copied from pszSrc without truncation, and the resultant destination buffer is null-terminated.
STRSAFE_E_INVALID_PARAMETER The value in cchDest is either larger than STRSAFE_MAX_CCH, or the destination buffer is already full.
STRSAFE_E_INSUFFICIENT_BUFFER The copy operation failed due to insufficient buffer space. The destination buffer contains a truncated, null-terminated version of the intended result. In situations where truncation is acceptable, this may not necessarily be seen as a failure condition.