键盘钩子dll编译出现问题，请大家支招，谢谢！

[别问了]

我现在想编写一个键盘钩子，但现在出现问题了，以下为头文件和源文件的部分内容

头文件：
typedef LRESULT (* HOOKPROC)(int code, WPARAM wParam, LPARAM lParam);
typedef HHOOK (*_SetWindowsHookExW)(int, HOOKPROC, HINSTANCE, DWORD);
typedef LRESULT (*_CallNextHookEx)(HHOOK, int, WPARAM, LPARAM);
typedef LRESULT (*_UnhookWindowsHookEx)(HHOOK);

_CallNextHookEx CallNextHookEx;
_SetWindowsHookExW SetWindowsHookEx;
_UnhookWindowsHookEx UnhookWindowsHookEx;

源文件：
//获得SetWindowsHookEx函数的地址
HINSTANCE g_hHookApiDLL=LoadLibrary(_T("coredll.dll"));

SetWindowsHookEx=(_SetWindowsHookExW)GetProcAddress(g_hHookApiDLL, _T("SetWindowsHookExW"));
UnhookWindowsHookEx=(_UnhookWindowsHookEx)GetProcAddress(g_hHookApiDLL, _T("UnhookWindowsHookExW"));
CallNextHookEx=(_CallNextHookEx)GetProcAddress(g_hHookApiDLL, _T("CallNextHookEx"));

报错信息：
error C2501: 'SetWindowsHookEx' : missing storage-class or type specifiers
error C2365: 'SetWindowsHookEx' : redefinition; previous definition was a 'function'

[zhangwenlang]

define CallNextHookEx CallNextHookEx;
define _SetWindowsHookExW SetWindowsHookEx;
define _UnhookWindowsHookEx UnhookWindowsHookEx;

[youyou6115]

定

[wolfmvp]

[Quote=引用楼主 shiftall 的回复:]
我现在想编写一个键盘钩子，但现在出现问题了，以下为头文件和源文件的部分内容

头文件：
typedef LRESULT (* HOOKPROC)(int code, WPARAM wParam, LPARAM lParam);
typedef HHOOK (*_SetWindowsHookExW)(int, HOOKPROC, HINSTANCE, DWORD);
typedef LRESULT (*_CallNextHookEx)(HHOOK, int, WPARAM, LPARAM);
typedef LRESULT (*_UnhookWindowsHookEx)(HHOOK);

_CallNextHookEx CallNextHookEx;
_SetWindowsHookExW SetWindowsHookEx;
_UnhookWindowsHookEx UnhookWindowsHookEx;

源文件：
//获得SetWindowsHookEx函数的地址
HINSTANCE g_hHookApiDLL=LoadLibrary(_T("coredll.dll"));

SetWindowsHookEx=(_SetWindowsHookExW)GetProcAddress(g_hHookApiDLL, _T("SetWindowsHookExW"));
UnhookWindowsHookEx=(_UnhookWindowsHookEx)GetProcAddress(g_hHookApiDLL, _T("UnhookWindowsHookExW"));
CallNextHookEx=(_CallNextHookEx)GetProcAddress(g_hHookApiDLL, _T("CallNextHookEx"));

报错信息：
error C2501: 'SetWindowsHookEx' : missing storage-class or type specifiers
error C2365: 'SetWindowsHookEx' : redefinition; previous definition was a 'function'
[/Quote]错误一：丢失存储类或者类型标识符。
错误二：SetWindowsHookEx重定义，前面定义时它为一个函数。