Solved

redirecting function to another version of dll

Posted on 2009-04-09
2
764 Views
Last Modified: 2013-12-14
Hi,

I would like to redirect a COM interface method into another version of same dll. I use Detours 2.1 Express to hook the function. in the snippet you can see a sample of hooking the IWebBrowser2::Navigate2 method. it works as expected but not as needed :) what I need is to call the Navigate2 method from custom dll (redirect it).

This is not a problem when it's an ordinary function like i.e. Sleep from kernel32.dll (I can use LoadLibrary, GetProcAddress or DetourFindFunction which in fact tries to use LoadLibrary...). Problem is how to call a COM interface method from custom dll. Any suggestions? Will appreciate any help. Thank you in advance.
#define CINTERFACE
 
#include <windows.h>
#include "detours.h"
#include <stdlib.h>
#include <iostream>
#include <string.h>
 
#include <ObjBase.h>
#include <ExDisp.h>
 
using namespace std;
 
//function prototype
HRESULT (__stdcall *RealNavigate2)(IWebBrowser2 *This,
								VARIANT *URL,
								VARIANT *flags,
								VARIANT *TargetFrameName,
								VARIANT *PostData,
								VARIANT *Headers) = NULL;
 
//detour function
HRESULT __stdcall NewNavigate2(IWebBrowser2 *This,
							VARIANT *URL,
							VARIANT *flags,
							VARIANT *TargetFrameName,
							VARIANT *PostData,
							VARIANT *Headers)
{
	//HERE IT CALLS THE ORIGINAL IWebBrowser2::Navigate2
	//I NEED TO REDIRECT IT TO OTHER VERSION OF SAME DLL
	cout << "hooked Navigate2 :)" << endl;
	HRESULT hr = RealNavigate2(This, URL, flags, TargetFrameName, PostData, Headers);
	return hr;
}
 
 
int main(int argc, char **argv){
	
	if(SUCCEEDED(OleInitialize(NULL))){
		
		IWebBrowser2 *pBr;
		CoCreateInstance(CLSID_InternetExplorer, NULL, CLSCTX_LOCAL_SERVER, IID_IWebBrowser2, (void**)&pBr);
		
		//assigning the target function for detouring
		RealNavigate2 = pBr->lpVtbl->Navigate2;
		
		//this part is not important, only some string processing
		string url = "http://www.google.com";
		VARIANT myURL;
		VariantInit(&myURL);
		myURL.vt = VT_BSTR;
 
		#ifndef UNICODE
		{
			wchar_t		*buffer;
			DWORD		size;
 
			size = MultiByteToWideChar(CP_ACP, 0, url.c_str(), -1, 0, 0);
			if (!(buffer = (wchar_t *)GlobalAlloc(GMEM_FIXED, sizeof(wchar_t) * size))){
				cout << "badalloc" << endl;
				getchar();
				return 0;
			}
			MultiByteToWideChar(CP_ACP, 0, url.c_str(), -1, buffer, size);
			myURL.bstrVal = SysAllocString(buffer);
			GlobalFree(buffer);
		}
		#else
		myURL.bstrVal = SysAllocString(url);
		#endif		
		
		//attaching target and detour function
		DetourTransactionBegin();
		DetourUpdateThread(GetCurrentThread());
		DetourAttach(&(PVOID&)RealNavigate2, NewNavigate2);
		DetourTransactionCommit();
 
		VARIANT vFlags;
		V_VT(&vFlags) = VT_I4;
		V_I4(&vFlags) = navOpenInNewWindow;
		
		VARIANT vEmpty;
		VariantInit(&vEmpty);
 
		//calling the target function, which gets hooked and it will jump to execution of NewNavigate2 detour function
		HRESULT hr = pBr->lpVtbl->Navigate2(pBr, &myURL, &vEmpty, &vEmpty, &vEmpty, &vEmpty);
		if (SUCCEEDED(hr))
		{
			pBr->lpVtbl->put_Visible(pBr, VARIANT_TRUE);
		}
		else
		{
			pBr->lpVtbl->Quit(pBr);
		}
 
		pBr->lpVtbl->Release(pBr);
 
		OleUninitialize();
 
		
	}
	
	return 0;
}

Open in new window

0
Comment
Question by:StraySod
2 Comments
 
LVL 39

Accepted Solution

by:
itsmeandnobodyelse earned 500 total points
ID: 24105537
A COM Dll is registered in registry what means that only one (probably the youngest) version is currently active.

The only way I know to call a dll of different version (beside of explicitly loading from file) is to register it in the .manifest file of your application. AFAIK that could be done with MSI but I never did it myself. And I don't know either whether it works for COM as well (but there is a good chance cause the .manifest simply overrules normal registry entries).

Note, for using .manifest files you need XP or Vista.
0
 
LVL 7

Author Closing Comment

by:StraySod
ID: 31568438
Ok, thank you for your reply :) will try it
0

Featured Post

Is Your AD Toolbox Looking More Like a Toybox?

Managing Active Directory can get complicated.  Often, the native tools for managing AD are just not up to the task.  The largest Active Directory installations in the world have relied on one tool to manage their day-to-day administration tasks: Hyena. Start your trial today.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
while loop over for loop 7 105
MAC and PC - Cheap video editing tools 4 132
I could not build boost code, 10 89
Increment column based of a FK 8 23
Introduction: Ownerdraw of the grid button.  A singleton class implentation and usage. Continuing from the fifth article about sudoku.   Open the project in visual studio. Go to the class view – CGridButton should be visible as a class.  R…
Here is a helpful source code for C++ Builder programmers that allows you to manage and manipulate HTML content from C++ code, while also handling HTML events like onclick, onmouseover, ... Some objects defined and used in this source include: …
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.
The viewer will learn how to use and create keystrokes in Netbeans IDE 8.0 for Windows.

831 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question