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lstrlen function

Applies to: desktop apps only

Determines the length of the specified string (not including the terminating null character).

Syntax

Copy

int WINAPI lstrlen(
  __in  LPCTSTR lpString
);

Parameters

lpString [in]

Type: LPCTSTR

The null-terminated string to be checked.

Return value

Type: int

The function returns the length of the string, in characters. If lpString is NULL, the function returns 0.

Security Considerations

Security Warning

Using this function incorrectly can compromise the security of your application. lstrlen assumes that lpString is a null-terminated string, or NULL. If it is not, this could lead to a buffer overrun or a denial of service attack against your application.

Consider using one of the following alternatives: StringCbLength or StringCchLength.

Requirements

Minimum supported client	Windows 2000 Professional
Minimum supported server	Windows 2000 Server
Header	Winbase.h (include Windows.h)
Library	Kernel32.lib
DLL	Kernel32.dll
Unicode and ANSI names	lstrlenW (Unicode) and lstrlenA (ANSI)