深入解析钩子和动态链接库中牛

你必须做的第一件事是创建共有的数据段。所以我们使用# pragma data_seg声明。使用某一好记的数据段名字(它必须是没有比8 个字符长) 。我想强调名字是任意的，这里使用了我自己的名字。我发现如果我使用好的名字象.SHARE 或.SHR 或.SHRDATA，别人会认为名字有特殊的意义。但是，我要说NO。# pragma data_seg(\".JOE\")

HANDLE hWnd = NULL;

# pragma dta_seg()

# pragma comment(linker ，\"/section:.JOE,rws \")

# pragma声明一个数据段，在此范围内声明的变量在初始化后将被指派到该数据段，假设他们初始化. 如未初始化，变量将被分配到缺省数据段，而# pragma 不起作用。

初看起来, 这将阻止你在共有的数据段使用一些C++ 对象，因为你无法初始化C++中用户定义的对象。这看来是一个根本局限。

# pragma comment使连接器有命令行开关被显示增加到链接步骤。你可以进入VC++ 项目| 设置并且改变连接器命令行。

你可以预定某一机制设置窗口句柄，例如

void SetWindow(HWND w) {hWnd = w; }

但更经常的是如下所示的与钩子结合。

Sample: A Mouse Hook

header file (myhook.h)

函数setMyHook并且clearMyHook必须在此被声明。这在我的另一文章中有详细论述。“The Ultimate DLL Header File.”

_T(\"UMW_MOUSEHOOK-\" \\

\"{B30856F0-D3DD-11d4-A00B-D04}\")

source file (p)

#include \"stdafx.h\"

#include \"myhook.h\"

#pragma data_seg(\".JOE\")

HWND hWndServer = NULL;

#pragma data_seg()

#pragma comment(\"linker, /section:.JOE,rws\")

HINSTANCE hInstance;

UINT HWM_MOUSEHOOK;

HHOOK hook;

// Forward declaration

static LRESULT CALLBACK msghook(int nCode, WPARAM wParam, LPARAM lParam);

/****************************************************************

*DllMain

*Inputs:

* HINSTANCE hInst: Instance handle for the DLL

* DWORD Reason: Reason for call

* LPVOID reserved: ignored

* Result: BOOL

* TRUE if successful

* FALSE if there was an error (never returned)

* Effect:

* Initializes the DLL.

****************************************************************/

BOOL DllMain(HINSTANCE hInst, DWORD Reason, LPVOID reserved)

{

switch(Reason)

{ /* reason */

//**********************************************

// PROCESS_ATTACH

//**********************************************

case DLL_PROCESS_ATTACH:

// Save the instance handle because we need it to set the hook later

hInstance = hInst;

// This code initializes the hook notification message

UWM_MOUSEHOOK = RegisterWindowMessage(UWM_MOUSEHOOK_MSG);

return TRUE;

//**********************************************

// PROCESS_DETACH

//**********************************************

case DLL_PROCESS_DETACH:

// If the server has not unhooked the hook, unhook it as we unload

if(hWndServer != NULL)

clearMyHook(hWndServer);

return TRUE;

} /* reason */

/****************************************************************

* setMyHook

* Inputs:

* HWND hWnd: Window whose hook is to be set

* Result: BOOL

* TRUE if the hook is properly set

* FALSE if there was an error, such as the hook already

*being set

* Effect:

* Sets the hook for the specified window.

* This sets a message-intercept hook (WH_GETMESSAGE)

* If the setting is successful, the hWnd is set as the

* server window.

****************************************************************/

__declspec(dllexport) BOOL WINAPI setMyHook(HWND hWnd)

治标要先治本 {

if(hWndServer != NULL)

return FALSE;

hook = SetWindowsHookEx(

WH_GETMESSAGE,

(HOOKPROC)msghook,

hInstance,

0 );

if(hook != NULL)

{ /* success */

hWndServer = hWnd;

return TRUE;

} /* success */

return FALSE;

} // SetMyHook

#define UWM_MOUSEHOOK_MSG \\

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