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StringCbCopy function

Copies one string to another. The size of the destination buffer is provided to the function to ensure that it does not write past the end of this buffer.

StringCbCopy is a replacement for the following functions:

Syntax


HRESULT StringCbCopy(
  _Out_  LPTSTR pszDest,
  _In_   size_t cbDest,
  _In_   LPCTSTR pszSrc
);

Parameters

pszDest [out]

Type: LPTSTR

The destination buffer, which receives the copied string.

cbDest [in]

Type: size_t

The size of the destination buffer, in bytes. This value must consider the length of pszSrc plus the terminating null character. The maximum number of bytes allowed is STRSAFE_MAX_CCH * sizeof(TCHAR).

pszSrc [in]

Type: LPCTSTR

A pointer to a buffer containing the source string. This source string must be null-terminated.

Return value

Type: HRESULT

This function can return one of the following values. It is strongly recommended that you use the SUCCEEDED and FAILED macros to test the return value of this function.

Return codeDescription
S_OK

Source data was present, fully copied without truncation, and the resultant destination buffer is null-terminated.

STRSAFE_E_INVALID_PARAMETER

The value in cbDest is either less than sizeof(TCHAR) or larger than the maximum allowed value.

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.

 

Note that this function returns an HRESULT value, unlike the functions that it replaces.

Remarks

Compared to the functions it replaces, StringCbCopy provides additional processing for proper buffer handling in your code. Poor buffer handling is implicated in many security issues that involve buffer overruns. StringCbCopy always null-terminates and never overflows a valid destination buffer, even if the contents of the source string change during the operation.

Behavior is undefined if the strings pointed to by pszSrc and pszDest overlap.

Neither pszSrc nor pszDest should be NULL. See StringCbCopyEx if you require the handling of null string pointer values.

StringCbCopy can be used in its generic form, or in its more specific forms. The data type of the string determines the form of this function that you should use.

String Data TypeString LiteralFunction
char"string"StringCbCopyA
TCHARTEXT("string")StringCbCopy
WCHARL"string"StringCbCopyW

 

Requirements

Minimum supported client

Windows XP with SP2 [desktop apps | Windows Store apps]

Minimum supported server

Windows Server 2003 with SP1 [desktop apps | Windows Store apps]

Header

Strsafe.h

Unicode and ANSI names

StringCbCopyW (Unicode) and StringCbCopyA (ANSI)

See also

Reference
StringCchCopy
StringCbCopyEx

 

 

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