int WSAStartup(
  __in   WORD wVersionRequested,
  __out  LPWSADATA lpWSAData
);

Ws2_32.lib 링크 옵션에 추가

Linking...
libcpd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol _errno
libcpd.lib(xstrcoll.obj) : error LNK2001: unresolved external symbol _errno
libcpd.lib(locale.obj) : error LNK2001: unresolved external symbol _errno
libcpd.lib(xwctomb.obj) : error LNK2001: unresolved external symbol _errno
libcpd.lib(wlocale.obj) : error LNK2001: unresolved external symbol _errno
libcpd.lib(xlocale.obj) : error LNK2001: unresolved external symbol _errno
libcpd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol ___mb_cur_max
libcpd.lib(xwctomb.obj) : error LNK2001: unresolved external symbol ___mb_cur_max
libcpd.lib(_tolower.obj) : error LNK2001: unresolved external symbol ___mb_cur_max
libcpd.lib(_toupper.obj) : error LNK2001: unresolved external symbol ___mb_cur_max
libcpd.lib(wlocale.obj) : error LNK2001: unresolved external symbol ___mb_cur_max
libcpd.lib(xwctomb.obj) : error LNK2001: unresolved external symbol ___lc_codepage
libcpd.lib(_tolower.obj) : error LNK2001: unresolved external symbol ___lc_codepage
libcpd.lib(_toupper.obj) : error LNK2001: unresolved external symbol ___lc_codepage
libcpd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol ___lc_codepage
libcpd.lib(xstrcoll.obj) : error LNK2001: unresolved external symbol ___lc_handle
libcpd.lib(xwctomb.obj) : error LNK2001: unresolved external symbol ___lc_handle
libcpd.lib(_tolower.obj) : error LNK2001: unresolved external symbol ___lc_handle
libcpd.lib(_toupper.obj) : error LNK2001: unresolved external symbol ___lc_handle
libcpd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol ___lc_handle
libcpd.lib(_tolower.obj) : error LNK2001: unresolved external symbol __pctype
libcpd.lib(_toupper.obj) : error LNK2001: unresolved external symbol __pctype
libcpd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol __pctype
libcpd.lib(xmbtowc.obj) : error LNK2001: unresolved external symbol __CrtDbgReport
libcpd.lib(xstrcoll.obj) : error LNK2001: unresolved external symbol ___lc_collate_cp


=> 이런 링크오류시 링크 옵션 수정

instead of /nodefaultlib:"libcd.lib" , try this :

go into "project" , "setting" , "link" ,

for "catgory" choose "customize" and check the box "force file output"

This will allow for multiply defined symbols

void open ( const char * filename,
            ios_base::openmode mode = ios_base::in | ios_base::out );

Open file

Opens a file whose name is s, associating its content with the stream object to perform input/output operations on it. The operations allowed and some operating details depend on parameter mode.

The function effectively calls rdbuf()->open(filename,mode).

If the object already has a file associated (open), the function fails.

On failure, the failbit flag is set (which can be checked with member fail), and depending on the value set with exceptions an exception may be thrown.

Parameters

filename

C-string containing the name of the file to be opened.

mode

Flags describing the requested i/o mode for the file. This is an object of type ios_base::openmode, which consists on a combination of one or more of the following flags defined as member constants:

flag value	opening mode
app	(append) Set the stream's position indicator to the end of the stream before each output operation.
ate	(at end) Set the stream's position indicator to the end of the stream on opening.
binary	(binary) Consider stream as binary rather than text.
in	(input) Allow input operations on the stream.
out	(output) Allow output operations on the stream.
trunc	(truncate) Any current content is discarded, assuming a length of zero on opening.

Return Value

Example

// fstream::open
#include <fstream>
using namespace std;

int main () {

  fstream filestr;

  filestr.open ("test.txt", fstream::in | fstream::out | fstream::app);

  // >> i/o operations here <<

  filestr.close();

  return 0;
}

In Visual C++ 2005, time is a wrapper for _time64 and time_t is, by default, equivalent to __time64_t. If you need to force the compiler to interpret time_t as the old 32-bit time_t, you can define _USE_32BIT_TIME_T. This is not recommended because your application may fail after January 18, 2038; the use of this macro is not allowed on 64-bit platforms.