The0neThe0nly
Expert Cheater
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Joined: 08 Dec 2009
Posts: 119
Location: In a box
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 Posted: Tue Dec 27, 2011 8:28 pm Post subject: DLL Problem (Not a CE issue) |
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Hey I wanted to test a dll that I built.
When injected, it should show up with a window with a menubar
Instead, it simply crashes the program that I am injecting into.
I injected it into Notepad, still didn't work. (I thought it may have been detected in the program earlier)
I did get a warning when I built this, it said that attempt 3.cpp(36): warning C4715: 'RegisterDLLWindowClass' : not all control paths return a value
Does the warning have to do anything with the crashes?
How do I fix this issue?
| Code: |
#include "stdafx.h"
#include "windows.h"
#define MYMENU_EXIT (WM_APP + 101)
#define MYMENU_MESSAGEBOX (WM_APP + 102)
HINSTANCE inj_hModule; //Injected Modules Handle
HWND prnt_hWnd; //Parent Window Handle
//WndProc for the new window
LRESULT CALLBACK DLLWindowProc (HWND, UINT, WPARAM, LPARAM);
//Register our windows Class
BOOL RegisterDLLWindowClass(wchar_t szClassName[])
{
WNDCLASSEX wc;
wc.hInstance = inj_hModule;
wc.lpszClassName = (LPCWSTR)L"InjectedDLLWindowClass";
wc.lpszClassName = (LPCWSTR)szClassName;
wc.lpfnWndProc = DLLWindowProc;
wc.style = CS_DBLCLKS;
wc.cbSize = sizeof (WNDCLASSEX);
wc.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wc.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor (NULL, IDC_ARROW);
wc.lpszMenuName = NULL;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
if (!RegisterClassEx (&wc))
return 0;
}
//Creating our windows Menu
HMENU CreateDLLWindowMenu()
{
HMENU hMenu;
hMenu = CreateMenu();
HMENU hMenuPopup;
if(hMenu==NULL)
return FALSE;
hMenuPopup = CreatePopupMenu();
AppendMenu (hMenuPopup, MF_STRING, MYMENU_EXIT, TEXT("Exit"));
AppendMenu (hMenu, MF_POPUP, (UINT_PTR) hMenuPopup, TEXT("File"));
hMenuPopup = CreatePopupMenu();
AppendMenu (hMenuPopup, MF_STRING,MYMENU_MESSAGEBOX, TEXT("MessageBox"));
AppendMenu (hMenu, MF_POPUP, (UINT_PTR) hMenuPopup, TEXT("Test"));
return hMenu;
}
//The new thread
DWORD WINAPI ThreadProc( LPVOID lpParam )
{
MSG messages;
wchar_t *pString = reinterpret_cast<wchar_t * > (lpParam);
HMENU hMenu = CreateDLLWindowMenu();
RegisterDLLWindowClass(L"InjectedDLLWindowClass");
prnt_hWnd = FindWindow(L"Window Injected Into ClassName", L"Window Injected Into Caption");
HWND hwnd = CreateWindowEx (0, L"InjectedDLLWindowClass", pString, WS_EX_PALETTEWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 400, 300, prnt_hWnd, hMenu,inj_hModule, NULL );
ShowWindow (hwnd, SW_SHOWNORMAL);
while (GetMessage (&messages, NULL, 0, 0))
{
TranslateMessage(&messages);
DispatchMessage(&messages);
}
return 1;
}
//Our new windows proc
LRESULT CALLBACK DLLWindowProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_COMMAND:
switch(wParam)
{
case MYMENU_EXIT:
SendMessage(hwnd, WM_CLOSE, 0, 0);
break;
case MYMENU_MESSAGEBOX:
MessageBox(hwnd, L"Test", L"MessageBox",MB_OK);
break;
}
break;
case WM_DESTROY:
PostQuitMessage (0);
break;
default:
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}
BOOL APIENTRY DllMain( HMODULE hModule, DWORD ul_reason_for_call,LPVOID lpReserved)
{
if(ul_reason_for_call==DLL_PROCESS_ATTACH) {
inj_hModule = hModule;
CreateThread(0, NULL, ThreadProc, (LPVOID)L"Window Title", NULL, NULL);
}
return TRUE;
}
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