WIN API GetFileSizeEx() function, was not declared in this scope - winapi

Question

In my c++ class, I want use WIN API GetFileSizeEx() function. When I compile my code, the compilator said:
"error: 'GetFileSizeEx' was not declared in this scope".
However, others functions like CreateFile() or WriteFile() work perfectly.
In my class header, I declare this :
#if defined(WINVER) && WINVER==0x0602 /* windows 8 */
#define WINVER 0x0602
#define _WIN32_WINNT 0x0602
#elif defined(WINVER) && WINVER==0x0601 /* windows 7 */
#define WINVER 0x0601
#define _WIN32_WINNT 0x0601
#elif defined(WINVER) && WINVER==0x0600 /* windows vista and server 2008 */
#define WINVER 0x0600
#define _WIN32_WINNT 0x0600
#elif defined(WINVER) && WINVER==0x0502 /* server 2003 */
#define WINVER 0x0502
#define _WIN32_WINNT 0x0502
#elif defined(WINVER) && WINVER==0x0501 /* windows xp */
#define WINVER 0x0501
#define _WIN32_WINNT 0x0501
#endif
#include <windows.h>
#include <winbase.h>
#include <string>
In my .cpp class:
Test::Test()
{
hFile = CreateFile(TEXT("conf/configure_tool.txt"),
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL);
if (hFile == INVALID_HANDLE_VALUE)
{
canAcces = false;
}else
{
if(GetFileSizeEx(hFile,&sized) != 0)
{
canAcces = true;
}
}
}
Have you an idea to resolve my problem ?

Answer 1

From the documentation:
Minimum supported client Windows XP [desktop apps only]
So you need to ensure that you have defined WINVER to be 0x0501 or greater.
If that doesn't solve the problem then the likely cause is that you are using a deficient SDK. Perhaps from an old version of a non-MS compiler. Make sure that you have an up-to-date SDK.
It must be said that the conditional code in the question that attempts to define _WIN32_WINNT is a little odd. Why don't you define _WIN32_WINNT at the same time as you define WINVER?