C/C++ 屏蔽所有按键消息

帮一个朋友写的这个小东西，要生成dll，有点小奇怪是要给java端来调用，主要就是个勾子来把消息截获了，就后程序程序就收不到了。关于这种勾子处理网上资料多的很。
生成hook 的dll代码

// dllmain.cpp : Defines the entry point for the DLL application.
#include "stdafx.h"

HHOOK g_HookHwnd = NULL;

// 钩子子程
LRESULT CALLBACK MyHookFun(int nCode, WPARAM wParam, LPARAM lParam)
{
    // 这个Structure包含了键盘的信息
    /*typedef struct {
    DWORD vkCode;
    DWORD scanCode;
    DWORD flags;
    DWORD time;
    ULONG_PTR dwExtraInfo;
    } KBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;*/
    // 我们只需要那个vkCode
    PKBDLLHOOKSTRUCT pVirKey = (PKBDLLHOOKSTRUCT)lParam;

    // MSDN说了,nCode < 0的时候别处理
    if (nCode >= 0)
    {
        // 按键消息
        switch (wParam)
        {
        case WM_KEYDOWN:
        case WM_SYSKEYDOWN:
        case WM_KEYUP:
        case WM_SYSKEYUP:
            switch (pVirKey->vkCode)
            {
            case VK_LWIN:
            case VK_RWIN:
                return 1;  // 吃掉消息
                break;
            }
            return 1;
            break;
        }
    }

    return CallNextHookEx(g_HookHwnd, nCode, wParam, lParam);
}


HMODULE g_Module;
BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
    {

        break;
    }
    }
    return TRUE;
}


extern "C" _declspec(dllexport) void FuncHookKey()
{
    if (!g_HookHwnd)
    {
        g_HookHwnd = SetWindowsHookEx(WH_KEYBOARD_LL, MyHookFun, g_Module, 0);
    }
}

extern "C" _declspec(dllexport) void FuncEndHook()
{
    UnhookWindowsHookEx(g_HookHwnd);
    g_HookHwnd = NULL;
}

然后就是来调用它了

typedef void (*FUNC_START)(); //FuncHookKey
typedef void (*FUNC_END)(); //FuncEndHook

HMODULE g_Dll;
FUNC_START func_start;
FUNC_END func_end;

g_Dll = LoadLibrary(L"Hook.dll");

func_start = (FUNC_START)GetProcAddress(g_Dll, "FuncHookKey");
func_end = (FUNC_END)GetProcAddress(g_Dll, "FuncEndHook");
//期间一直GetProAddress为空，吗的，注意生成dll的各种小细节，好了现在就可以拿着地址到处乱玩了~~

C/C++ 屏蔽所有按键消息

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