@msdn=https://social.msdn.microsoft.com/Search/en-US?query=$$$ @mscvrtPInvoke=http://www.pinvoke.net/default.aspx/msvcrt.$$$ Summary: Opens a file. These versions of '''fopen''' and '''_wfopen''' have security enhancements, as described in ''Security Features in the CRT'' [https://msdn.microsoft.com/en-us/library/8ef0s5kh.aspx]. !!!!C# Signature: [DllImport("msvcrt.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi, SetLastError=true)] public static extern Int32 fopen_s(out IntPtr pFile, String filename, String mode); [DllImport("msvcrt.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Unicode, SetLastError=true)] public static extern Int32 _wfopen_s(out IntPtr pFile, String filename, String mode); !!!!VB Signature: <DllImport("msvcrt.dll", CallingConvention:=CallingConvention.Cdecl, CharSet:=CharSet.Ansi, SetLastError:=True)> _ Public Shared Function fopen_s(ByRef pFile As IntPtr, ByVal filename As String, ByVal mode As String) As Int32 End Function <DllImport("msvcrt.dll", CallingConvention:=CallingConvention.Cdecl, CharSet:=CharSet.Unicode, SetLastError:=True)> _ Public Shared Function _wfopen_s(ByRef pFile As IntPtr, ByVal filename As String, ByVal mode As String) As Int32 End Function !!!!Alternative Managed API: System.IO.FileStream@msdn !!!!Notes: It is advisable to use '''___wfopen_s''' whenever possible. '''fopen_s''' supports Unicode but requires additional "help"; you must add a "ccs=_encoding_" parameter to the _mode_ parameter. Valid ''encoding'' values are '''UNICODE''', '''UTF-8''', and '''UTF-16LE'''; if _ccs_ is not provided, '''fopen_s''' falls back to ASCII (it is unknown what happens if an ''invalid'' value is passed). !!!!Tips & Tricks: Please add some! !!!!Sample Code: Opening a Unicode file (''example.txt'') for writing (C#): // "incorrect" way IntPtr file; if (!fopen_s(out file, "example.txt", "w, ccs=UNICODE")) // fail else // success // "correct" way IntPtr file; if (!_wfopen_s(out file, "example.txt", "w")) // fail else // success !!!!See Also: fopen@mscvrtPInvoke (includes '''_wfopen''') Documentation: fopen_s@msdn on MSDN
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