| 术语 | stringcchcopynex |
| 释义 | StringCchCopyNEx 语法： HRESULT StringCchCopyNEx( LPTSTR pszDest, size_t cchDest, LPCTSTR pszSrc, size_t cchSrc, LPTSTR *ppszDestEnd, size_t *pcchRemaining, DWORD dwFlags ); StringCchCopyNEx功能 StringCchCopyNEx是一个strncpy替代。 StringCchCopyNEx复制从源字符串中的字符数。大小，以字符缓冲区的目标是提供的功能，以确保不会写入StringCchCopyNEx过去这个缓冲区的末尾。 StringCchCopyNEx增加了StringCchCopyN功能通过返回一个指向目标字符串的结束以及闲置字符数在该字符串。旗也可以传递给函数的额外控制。 参数 pszDest [out]指向它接收缓冲区复制的字符串。 cchDest [in]的pszDest大小，以字符。此值必须至少足以容纳复制的字符(即pszSrc或cchSrc价值，以较少者为准)，加上1至占终止空字符的长度。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。 cchSrc [in]的最大字符数从pszSrc复制到pszDest。 ppszDestEnd [内]的指针地址的pszDest结束。如果ppszDestEnd不为NULL和任何数据到目标缓冲区复制的，在该字符串的结束点，终止空字符。 pcchRemaining [out]指向一个变量，它指示在pszDest人数未使用的字符，包括终止空字符。如果pcchRemaining为NULL，则计数不保留或退回。 dwFlags [in]一个或多个下列值。 STRSAFE_FILL_BEHIND_NULL 如果函数成功，在dwFlags(0)低字节是用来填补pszDest以下终止空字符初始化部分。 STRSAFE_IGNORE_NULLS 对待像(空字符串文字("")).空字符串指针 STRSAFE_FILL_ON_FAILURE 如果函数失败，在dwFlags(0)低字节是用来填充整个pszDest缓冲区，缓冲区空终止。在一个STRSAFE_E_INSUFFICIENT_BUFFER故障的情况下，任何截断的字符串返回的覆盖。 STRSAFE_NULL_ON_FAILURE 如果函数失败，pszDest设置为空字符串(文字("")).在一个STRSAFE_E_INSUFFICIENT_BUFFER故障的情况下，任何截断字符串覆盖。 STRSAFE_NO_TRUNCATION 正如STRSAFE_NULL_ON_FAILURE情况下，如果函数失败，pszDest设置为空字符串(文字("")).在一个STRSAFE_E_INSUFFICIENT_BUFFER故障的情况下，任何截断字符串覆盖。 返回值 请注意，此函数返回，而不是strncpy，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_PARAMETEREither pszDest或pszSrc比STRSAFE_MAX_CCH更大，pszDest为NULL时，源数据是目前复制，或无效的国旗通过。 STRSAFE_E_INSUFFICIENT_BUFFERThe复制操作失败，由于没有足够的缓冲空间。视乎dwFlags价值，目标缓冲区可能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 StringCchCopyNEx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。 StringCchCopyNEx总是空终止一个非零长度目标缓冲区。 StringCchCopyNEx可以用在它的通用形式，或作为StringCchCopyNExA特别(为ANSI字符串)或StringCchCopyNExW(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”StringCchCopyNExA TCHARTEXT(“字符串”)StringCchCopyNEx WCHARL“字符串”StringCchCopyNExW 虽然这个程序是作为strncpy替代意味着，在行为上存在的分歧。如果大于cchSrc中的字符pszSrc，StringCchCopyNEx人数不像strncpy，不会继续空字符填充pszDest直到cchSrc字符被复制。 行为是未定义如果字符串指向pszSrc和pszDest重叠。 无论pszSrc也不pszDest应该是NULL，除非STRSAFE_IGNORE_NULLS标志被指定，在这种情况下都可能为NULL。然而，由于一个错误没有足够的空间仍可能会返回空值，即使被忽略。 功能信息 Headerstrsafe.h import librarystrsafe.lib 参见 StringCchCopyN，StringCbCopyNEx ＝＝英文原文＝＝StringCchCopyNEx Function StringCchCopyNEx is a replacement for strncpy . StringCchCopyNEx 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 StringCchCopyNEx does not write past the end of this buffer. StringCchCopyNEx adds to the functionality of StringCchCopyN by returning a pointer to the end of the destination string as well as the number of characters left unused in that string. Flags may also be passed to the function for additional control. Syntax HRESULT StringCchCopyNEx( LPTSTR pszDest, size_t cchDest, LPCTSTR pszSrc, size_t cchSrc, LPTSTR *ppszDestEnd, size_t *pcchRemaining, DWORD dwFlags ); Parameters pszDest [out] Pointer to a buffer which receives the copied string. cchDest [in] Size of pszDest, in characters. This value must be at least 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. ppszDestEnd [out] Address of a pointer to the end of pszDest. If ppszDestEnd is non-NULL and any data is copied into the destination buffer, this points to the terminating null character at the end of the string. pcchRemaining [out] Pointer to a variable that indicates the number of unused characters in pszDest, including the terminating null character. If pcchRemaining is NULL, the count is not kept or returned. dwFlags [in] One or more of the following values. STRSAFE_FILL_BEHIND_NULL If the function succeeds, the low byte of dwFlags (0) is used to fill the uninitialized portion of pszDest following the terminating null character. STRSAFE_IGNORE_NULLS Treat null string pointers like empty strings (TEXT("")). STRSAFE_FILL_ON_FAILURE If the function fails, the low byte of dwFlags (0) is used to fill the entire pszDest buffer, and the buffer is null-terminated. In the case of a STRSAFE_E_INSUFFICIENT_BUFFER failure, any truncated string returned is overwritten. STRSAFE_NULL_ON_FAILURE If the function fails, pszDest is set to an empty string (TEXT("")). In the case of a STRSAFE_E_INSUFFICIENT_BUFFER failure, any truncated string is overwritten. STRSAFE_NO_TRUNCATION As in the case of STRSAFE_NULL_ON_FAILURE, if the function fails, pszDest is set to an empty string (TEXT("")). In the case of a STRSAFE_E_INSUFFICIENT_BUFFER failure, any truncated string is overwritten. 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_OKSource data was present, fully copied without truncation, and the resultant destination buffer is null-terminated. STRSAFE_E_INVALID_PARAMETEREither pszDest or pszSrc is greater than STRSAFE_MAX_CCH, pszDest is NULL when there is source data present to copy, or an invalid flag was passed. STRSAFE_E_INSUFFICIENT_BUFFERThe copy operation failed due to insufficient buffer space. Depending on the value of dwFlags, the destination buffer may contain 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 StringCchCopyNEx provides additional processing for proper buffer handling in your code. Poor buffer handling is implicated in many security issues that involve buffer overruns. StringCchCopyNEx always null-terminates a non-zero-length destination buffer. StringCchCopyNEx can be used in its generic form, or specifically as StringCchCopyNExA (for ANSI strings) or StringCchCopyNExW (for Unicode strings). The form to use is determined by your data. String Data TypeString LiteralFunction char"string"StringCchCopyNExA TCHARTEXT("string")StringCchCopyNEx WCHARL"string"StringCchCopyNExW While this routine is meant as a replacement for strncpy, there are differences in behavior. If cchSrc is larger than the number of characters in pszSrc, StringCchCopyNEx—unlike strncpy—does not continue to pad pszDest with null characters until cchSrc characters have been copied. Behavior is undefined if the strings pointed to by pszSrc and pszDest overlap. Neither pszSrc nor pszDest should be NULL unless the STRSAFE_IGNORE_NULLS flag is specified, in which case both may be NULL. However, an error due to insufficient space may still be returned even though null values are ignored. Function Information Headerstrsafe.h Import librarystrsafe.lib See Also StringCchCopyN , StringCbCopyNEx ＝＝原始网址＝＝http://msdn.microsoft.com/en-us/library/ms647533(VS.85).aspx\n |
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