我仍然在苦苦挣扎。
我的目标是:
免责声明:我知道有更简单的方法从记事本中获取文本/内容,但这是我学习C,winapi,Subclassing和hooks的一种方式。
我的问题是SetWindowLongPtr总是返回ERROR_ACCESS_DENIED错误(代码5)。
2013年5月22日:这已经修复了! 问题是SetWindowLongPtr在错误的地方。它必须位于GetMsgProc函数内。
问题变得有点冗长,所以我重新写了这个问题(用更新的代码)
现在的问题是当目标是notepad.exe时,GetMsgProc被 NOT 调用。如果我将目标更改为simple.exe,GetMsgProc将被调用并运行!
(Simple.exe只是一个简单的GUI):
代码如下所示:
exe.cpp
#include <windows.h>
#include "Resource.h"
#include <stdlib.h>
#include "stdafx.h"
#include <strsafe.h>
#include "C:\Users\Kristensen\Documents\Visual Studio 2012\Projects\Win32D\dll\dllHeader.h"
//---------------------------------------------------------------------------
HWND hWnd;
LRESULT CALLBACK DlgProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
//---------------------------------------------------------------------------
INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
DialogBox(hInstance, MAKEINTRESOURCE(IDD_DLGFIRST),
hWnd, reinterpret_cast<DLGPROC>(DlgProc));
return FALSE;
}
//---------------------------------------------------------------------------
LRESULT CALLBACK DlgProc(HWND hWndDlg, UINT Msg, WPARAM wParam, LPARAM lParam)
{
switch(Msg)
{
case WM_INITDIALOG:
return TRUE;
case WM_COMMAND:
switch(wParam)
{
case IDOK:
hookNotepad();
return TRUE;
case IDCANCEL:
removeHook();
EndDialog(hWndDlg, 0);
}
break;
}
return FALSE;
}
//---------------------------------------------------------------------------
dllHeader.h
#ifdef DLLAPI
#else
#define DLLAPI extern "C" __declspec(dllimport)
#endif
DLLAPI bool hookNotepad();
DLLAPI bool removeHook();
dll.cpp:
#include "stdafx.h"
#include <windows.h>
#define DLLAPI extern "C" __declspec(dllexport)
#include "dllHeader.h"
// shared variables
#pragma data_seg("Shared")
HHOOK g_hHook = NULL; // Hook for Notepad
HWND npHWND = NULL; // Notepad handle
#pragma data_seg()
#pragma comment(linker, "/section:Shared,rws")
// Forward references
LRESULT CALLBACK GetMsgProc(int nCode, WPARAM wParam, LPARAM lParam) ;
LRESULT CALLBACK NewWndProc(HWND Hwnd, UINT Message, WPARAM wParam, LPARAM lParam);
//LRESULT CALLBACK CBTProc(int nCode, WPARAM wParam, LPARAM lParam) ;
LONG OldWndProc;
DWORD pid;
HINSTANCE g_hInstDll = NULL; // DllMain entry (DLL_PROCESS_ATTACH)
DWORD npThreadId = NULL; // Notepad thread ID
LRESULT CALLBACK GetMsgProc(int nCode, WPARAM wParam, LPARAM lParam) //Testing with CBTProc - same issues as with GetMsgProc.
{
//If I hook notepad.exe, I never get called. (silence)
//If I hook simple.exe, I get called (Beep beep!)
// make some noise
static DWORD dwTickKeep = 0;
if ((GetTickCount()-dwTickKeep)>300)
{ dwTickKeep = GetTickCount();
Beep(2000, 100);
}
//Subclassing......
//For simple.exe: (working)
//HWND hwndEdit = ::FindWindowEx(npHWND,NULL,TEXT("WindowsForms10.RichEdit20W.app.0.2bf8098_r14_ad1"), NULL);
//For notepad.exe: (not working)
HWND hwndEdit = ::FindWindowEx(npHWND,NULL,TEXT("Edit"), NULL);
if (hwndEdit)
{
//Subclass it
OldWndProc = GetWindowLongPtr(hwndEdit, GWLP_WNDPROC);
SetWindowLongPtr(hwndEdit, GWL_WNDPROC, (LONG_PTR)NewWndProc);
}
return(CallNextHookEx(g_hHook, nCode, wParam, lParam));
}
BOOL APIENTRY DllMain( HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved )
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
g_hInstDll = hModule;
break;
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
bool hookNotepad ()
{
// If target is running
// if (npHWND = FindWindow(NULL, TEXT("simpleGUI")))
if (npHWND = FindWindow(TEXT("Notepad"), NULL))
{
// Finds the ThreadID for target. We use this in SetWindowsHookEx
npThreadId = GetWindowThreadProcessId(npHWND, &pid);
// Sets the hook in target
g_hHook = SetWindowsHookEx(WH_GETMESSAGE, GetMsgProc, g_hInstDll, npThreadId);
//g_hHook = SetWindowsHookEx(WH_CBT, CBTProc, g_hInstDll, npThreadId);
// If the hook succesed
if (g_hHook)
{
////Add a menu in the notepad.exe, but not relevant for subclassing notepads edit class...
//HMENU hCurrent = GetMenu(npHWND); //Get the CURRENT menu of the window.
//HMENU hNew = CreateMenu(); //Create a new one.
//AppendMenu(hCurrent, MF_STRING | MF_POPUP, (unsigned int)hNew, TEXT("myMenu"));
//AppendMenu(hNew, MF_STRING, 2000, L"myButton"); //2000 is the ID of the new button.
//DrawMenuBar(npHWND); //redraw the Menu.
//Force a msg to the messagequeue, so that the hook function(GetMsgProc) gets called
PostThreadMessage(npThreadId, WM_NULL, 0, 0);
return 1;
}
return 0;
}
else
//Notepad is not running
return 0;
}
bool removeHook()
{
// Removes the hook
if (g_hHook != NULL)
{
UnhookWindowsHookEx(g_hHook);
g_hHook = NULL;
}
return 0;
}
LRESULT CALLBACK NewWndProc(HWND Hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
//We should come here and should be able to read the text from the Edit class...
return CallWindowProc((WNDPROC)OldWndProc, Hwnd, Message, wParam, lParam);
}
任何提示,评论或提示都非常感谢......
答案 0 :(得分:2)
您的代码中存在3个问题:
(1)变量HWND npHWND
意味着在host-exe和notepad-exe之间共享,因此它必须放在共享数据段块中。此值目前在'hookNotepad'调用内部进行评估,并且仅存在于host-exe中。此问题导致nepHWND句柄在notepad-exe中为空,因此SetWindowLongPtr
调用失败。
(2)有2 SetWindowLongPtr
个电话,其中一个是错误的。 GetMsgProc
内的一个是正确的,因为它将在安装钩子时在notepad-exe上下文中执行。删除hookNotepad
内的其他错误内容。
(3)即使解决了(1)和(2),SetWindowLongPtr
的最终行为可能也不是你的预期,因为notepad-exe的主要UI交互元素是嵌入式编辑控件,不是主框架窗口。您应该枚举notepad-frame和子类的子窗口,只有Edit
类的子窗口。
编辑#1 - 添加声音指示器代码以检查活动------------------------------------
在GetMsgProc
// make some noise
static DWORD dwTickKeep = 0;
if ((GetTickCount()-dwTickKeep)>300)
{ dwTickKeep = GetTickCount();
Beep(2000, 100);
}
答案 1 :(得分:1)
您必须在钩子化过程的上下文中执行此操作。您的hookNotepad()函数在不同的进程中运行,因此您的WndProc()函数位于不同的地址空间中。