代码:

WINUSERAPI  BOOL WINAPI  LockWorkStation(VOID);

代码:

#if(_WIN32_WINNT >= 0x0500)
WINUSERAPI
BOOL
WINAPI
LockWorkStation(
    VOID);
#endif /* _WIN32_WINNT >= 0x0500 */

代码:

Windows XP   _WIN32_WINNT>=0x0501     
Windows 2000   _WIN32_WINNT>=0x0500     
Windows NT 4.0  _WIN32_WINNT>=0x0400     

代码:

#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0400
#endif

代码:

Windows 95、98 and Windows NT   4.0     WINVER=0x0400         
Windows 98 and Windows 2000         WINVER=0x0500     
Windows 2000                             WINVER=0x0500
Windows xp                             WINVER=0x0501  

引用:

The WINVER symbol is the earliest one. That's the symbol that 16-bit Windows used to control the versioning of its header files, and its use carried forward into the 32-bit header files, presumably from the people who did the initial conversion of the header files to 32-bit and who grew up with the WINVER symbol. This symbol is still used a lot in the header files that can trace their origins to 16-bit Windows, such as winuser.h, wingdi.h, and mmsystem.h.
The _WIN32_WINNT symbol came next. I'm not sure where it came from, but from its name it probably was invented by the Windows NT team in order to allow them to block off sections of the header file that are available only in the Windows NT implementation of Win32. Don't forget that in the early days, there was also Win32s, a subset of Win32 that could run on 16-bit Windows 3.1. The single WINVER symbol wasn't enough to specify exactly what you wanted to be compatible with. For example, a function available only in Windows NT 3.1 would be guarded with #if _WIN32_WINNT >= 0x030A so that programs that wanted to run on Win32s could set _WIN32_WINNT to zero and keep that function off-limits.
Similarly, both Windows 95 and Windows NT 4 identified themselves as Windows major version 4, so the WINVER symbol was insufficient to distinguish them. Functions that existed in Windows NT 4 but not in Window 95 were therefore guarded with _WIN32_WINNT.
On the other hand, there were also functions that were first introduced in Windows 95 and did not exist in the original version of Windows NT 4. The _WIN32_WINDOWS symbol let you specify that you wanted access to stuff that was new for Windows 95 and which would also be ported to Windows NT 4 and future versions of Windows NT.

代码:

Internet Explorer 3.0   _WIN32_IE=0x0300      
Internet Explorer 4.0   _WIN32_IE=0x0400      
Internet Explorer 5.0   _WIN32_IE=0x0500   
Internet Explorer 6.0  _WIN32_IE=0x0600   

代码:

#define _WIN32_WINNT 0x0501
#define _WIN32_IE 0x0600  
#define WINVER  0x0501

引用:

你给的这些宏的数值可以更改吗？按照我上面搜集的资料，vista系统的应该是：
   _WIN32_WINNT>=0x0600
    WINVER>=0x0600

为何你给的那些数还要小呢？