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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.


HRESULT StringCchGets(
  _Out_ LPTSTR pszDest,
  _In_  size_t cchDest


pszDest [out]


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


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

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


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


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


The value in cchDest is 1 or less.


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


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



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]



Unicode and ANSI names

StringCchGetsW (Unicode) and StringCchGetsA (ANSI)

See also




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