| 术语 | stringcchcopy |
| 释义 | StringCchCopy 语法： HRESULT StringCchCopy( LPTSTR pszDest, size_t cchDest, LPCTSTR pszSrc ); StringCchCopy功能 StringCchCopy是一个strcpy更换。大小，以字符缓冲区的目标是提供的功能，以确保不会写入StringCchCopy过去这个缓冲区的末尾。 参数 pszDest [out]指向它接收缓冲区复制的字符串。 cchDest [in]的目标缓冲区的大小，以字符。此值必须等于pszSrc加1的长度占复制源字符串和终止空字符。所允许的最大字符数为STRSAFE_MAX_CCH。 pszSrc [in]指向一个缓冲区包含源字符串。此源字符串必须空终止。 返回值 请注意，此函数返回，而不是strcpy，它返回一个指针的hresult。我们强烈建议您使用的成功和失败宏来测试这个函数的返回值。 S_OKSource数据在场，完全没有截断复制，并由此产生的目标缓冲区是空终止。 STRSAFE_E_INVALID_PARAMETERThe在cchDest值为0或比STRSAFE_MAX_CCH更大。 STRSAFE_E_INSUFFICIENT_BUFFERThe复制操作失败，由于没有足够的缓冲空间。目标缓冲区包含了预期的结果被截断，空终止的版本。截断的情况下是可以接受的，这未必是一个失败的情况出现。 备注 StringCchCopy提供了代码中的适当缓冲处理额外的处理。可怜的缓冲处理是牵连，许多安全问题涉及缓冲区溢出。 StringCchCopy总是空终止一个非零长度目标缓冲区。 StringCchCopy可以用在它的通用形式，或作为StringCchCopyA特别(为ANSI字符串)或StringCchCopyW(为Unicode字符串)。该表格使用取决于您的数据。 字符串数据String类型LiteralFunction 字符“字符串”StringCchCopyA TCHARTEXT(“字符串”)StringCchCopy WCHARL“字符串”StringCchCopyW StringCchCopy及其ANSI和Unicode的变种替换这些功能： strcpy wcscpy lstrcpy strcpy _tcscpy _ftcscpy 此功能不是strncpy由于行为差异更换，可能会导致错误如果您尝试使该更换。请使用StringCchCopyN或StringCchCopyNEx取代strncpy。 行为是未定义如果字符串指向pszSrc和pszDest重叠。 无论pszSrc也不pszDest应为NULL。见StringCchCopyEx如果您需要的空字符串指针值的处理。 功能信息 Headerstrsafe.h import librarystrsafe.lib 参见 StringCbCopy，StringCchCopyEx ＝＝英文原文＝＝StringCchCopy Function StringCchCopy is a replacement for strcpy . The size, in characters, of the destination buffer is provided to the function to ensure that StringCchCopy does not write past the end of this buffer. Syntax HRESULT StringCchCopy( LPTSTR pszDest, size_t cchDest, LPCTSTR pszSrc ); Parameters pszDest [out] Pointer to a buffer which receives the copied string. cchDest [in] Size of the destination buffer, in characters. This value must equal the length of pszSrc plus 1 to account for the copied source string and 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. Return Value Note that this function returns an HRESULT as opposed to strcpy, 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_OKSource data was present, fully copied without truncation, and the resultant destination buffer is null-terminated. STRSAFE_E_INVALID_PARAMETERThe value in cchDest is either 0 or larger than STRSAFE_MAX_CCH. STRSAFE_E_INSUFFICIENT_BUFFERThe 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. Remarks StringCchCopy provides additional processing for proper buffer handling in your code. Poor buffer handling is implicated in many security issues that involve buffer overruns. StringCchCopy always null-terminates a non-zero-length destination buffer. StringCchCopy can be used in its generic form, or specifically as StringCchCopyA (for ANSI strings) or StringCchCopyW (for Unicode strings). The form to use is determined by your data. String Data TypeString LiteralFunction char"string"StringCchCopyA TCHARTEXT("string")StringCchCopy WCHARL"string"StringCchCopyW StringCchCopy and its ANSI and Unicode variants are replacements for these functions: strcpy wcscpy lstrcpy strcpy _tcscpy _ftcscpy This function is not a replacement for strncpy due to differences in behavior, and errors may result if you attempt to make that replacement. Please use StringCchCopyN or StringCchCopyNEx to replace strncpy. Behavior is undefined if the strings pointed to by pszSrc and pszDest overlap. Neither pszSrc nor pszDest should be NULL. See StringCchCopyEx if you require the handling of null string pointer values. Function Information Headerstrsafe.h Import librarystrsafe.lib See Also StringCbCopy , StringCchCopyEx ＝＝原始网址＝＝http://msdn.microsoft.com/en-us/library/ms647527(VS.85).aspx\n |
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