今天自己照書編寫了《windows 程序設計》第四章的sysmets1程序，結果出錯如下：
sysmets1/sysmets1.h(147) : error C2065: 'SM_MOUSEWHEELPRESENT' : undeclared identifier
sysmets1/sysmets1.h(147) : error C2099: initializer is not a constant
sysmets1/sysmets1.h(147) : warning C4047: 'initializing' : 'int ' differs in levels of indirection from 'unsigned short [21]'
sysmets1/sysmets1.h(149) : error C2065: 'SM_XVIRTUALSCREEN' : undeclared identifier
sysmets1/sysmets1.h(149) : error C2099: initializer is not a constant
sysmets1/sysmets1.h(150) : warning C4047: 'initializing' : 'int ' differs in levels of indirection from 'unsigned short [24]'
sysmets1/sysmets1.h(151) : error C2065: 'SM_YVIRTUALSCREEN' : undeclared identifier
sysmets1/sysmets1.h(151) : error C2099: initializer is not a constant
sysmets1/sysmets1.h(153) : error C2065: 'SM_CXVIRTUALSCREEN' : undeclared identifier
sysmets1/sysmets1.h(153) : error C2099: initializer is not a constant
sysmets1/sysmets1.h(153) : warning C4047: 'initializing' : 'int ' differs in levels of indirection from 'unsigned short [19]'
sysmets1/sysmets1.h(155) : error C2065: 'SM_CYVIRTUALSCREEN' : undeclared identifier
sysmets1/sysmets1.h(155) : error C2099: initializer is not a constant
sysmets1/sysmets1.h(156) : warning C4047: 'initializing' : 'int ' differs in levels of indirection from 'unsigned short [22]'
sysmets1/sysmets1.h(157) : error C2065: 'SM_CMONITORS' : undeclared identifier
sysmets1/sysmets1.h(157) : error C2099: initializer is not a constant
sysmets1/sysmets1.h(159) : error C2065: 'SM_SAMEDISPLAYFORMAT' : undeclared identifier
sysmets1/sysmets1.h(159) : error C2099: initializer is not a constant
sysmets1/sysmets1.h(159) : warning C4047: 'initializing' : 'int ' differs in levels of indirection from 'unsigned short [21]'
Error executing cl.exe.
Creating browse info file...
SYSMETS1.exe - 14 error(s), 5 warning(s)
解決辦法：
因爲各個window版本所能使用的常量不一樣,所以在xp環境下,必須在sysmets1.c文件最開始處加入一句:
#define WINVER 0x0501
以下是windows其他版本號:
windows server 2003
winver>=0x0502
windows xp
winver>=0x0501
windows 2000
winver>=0x0500
windows nt 4.0
winver>=0x0400
windows me
winver>=0x0500
windows 98
winver>=0x0410
windows 95
winver>=0x0400
winver是檢查Windows版本的命令，開始->運行->winver，可以看出你當前的Windows版本信息。