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StringCchGets function

Gets one line of text from stdin, up to and including the newline character ('\n'). The line of text is copied to the destination buffer, and the newline character is replaced with a null character. The size of the destination buffer is provided to the function to ensure that it does not write past the end of this buffer.

Note  This function can only be used inline.

StringCchGets is a replacement for the following functions:

StringCchGets is not a replacement for fgets, which does not replace newline characters with a terminating null character.

Syntax


HRESULT StringCchGets(
  _Out_  LPTSTR pszDest,
  _In_   size_t cchDest
);

Parameters

pszDest [out]

Type: LPTSTR

The destination buffer, which receives the copied characters.

cchDest [in]

Type: size_t

The size of the destination buffer, in characters. This value must be at least 2 for the function to succeed. The maximum number of characters allowed, including the terminating null character, is STRSAFE_MAX_CCH. If cchDest is too small to hold the full line of text, the data is truncated.

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

Characters were read from stdin, were copied to the buffer at pszDest, and the buffer was null-terminated.

STRSAFE_E_END_OF_FILE

Indicates an error or end-of-file condition. Use feof or ferror to determine which one has occurred.

STRSAFE_E_INVALID_PARAMETER

The value in cchDest is larger than the maximum allowed value.

STRSAFE_E_INSUFFICIENT_BUFFER

The value in cchDest is 1 or less.

 

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

Remarks

StringCchGets provides additional processing for proper buffer handling in your code. Poor buffer handling is implicated in many security issues that involve buffer overruns. StringCchGets always null-terminates a nonzero-length destination buffer.

The value of pszDest should not be NULL. See StringCchGetsEx if you require the handling of null string pointer values.

StringCchGets 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, as shown in the following table.

String Data TypeString LiteralFunction
char"string"StringCchGetsA
TCHARTEXT("string")StringCchGets
WCHARL"string"StringCchGetsW

 

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

StringCchGetsW (Unicode) and StringCchGetsA (ANSI)

See also

Reference
StringCbGets
StringCchGetsEx

 

 

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