Re: Base Address - C / C++ / MFC Discussion Boards

Michael Dunn23-Jan-07 19:22

23-Jan-07 19:22

The HINSTANCE of a module is its load address. The address you get from GetProcAddress() points directly at the code, which is in the part of the address space that the module is mapped to.

--Mike--
Visual C++ MVP Cool | :cool:

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Re: Base Address

Shouvik Das23-Jan-07 19:26

Shouvik Das

23-Jan-07 19:26

To use GetProcAddress() the source classes should be a DLL project.
Frown | :(

unfortunately they are not. hence its only during build time i can resolve the address.

Wat do you suggest. Make sure one thing that I can't change one byte in the source classes provided to me. I've to apply means to access the methods in them be it private or public. Name mangling resolvng is one of the issues that can suffice to my needs

There are only two kinds of people who are really fascinating-people who know absolutely everything, and people who know absolutely nothing.
Oscar Wilde (1854-1900)
Regards...
Shouvik

Re: Base Address

Stephen Hewitt23-Jan-07 19:31

Stephen Hewitt

23-Jan-07 19:31

GetProcAddress will only work for exported functions.

Steve

Re: Base Address

Shouvik Das23-Jan-07 19:35

Shouvik Das

23-Jan-07 19:35

by exported u mean i need to create a .def and dll isn't it

There are only two kinds of people who are really fascinating-people who know absolutely everything, and people who know absolutely nothing.
Oscar Wilde (1854-1900)
Regards...
Shouvik

Re: Base Address

Stephen Hewitt23-Jan-07 19:37

Stephen Hewitt

23-Jan-07 19:37

Yeah. I see no technical reason why an .EXE can't have exports (the PE file format would allow it) but when I've tried (in the past) it hasn't worked.

Steve

Re: Base Address

Shouvik Das23-Jan-07 19:39

Shouvik Das

23-Jan-07 19:39

really stephen u seem to read my mind.;)

Yes I tried to learn about Portable Executables but dont know how to implement them in VC++6.0. CAn you help me out please. i mean i really am a mediocre Blush | :O

with C++

There are only two kinds of people who are really fascinating-people who know absolutely everything, and people who know absolutely nothing.
Oscar Wilde (1854-1900)
Regards...
Shouvik

Re: Base Address

Stephen Hewitt23-Jan-07 19:40

Stephen Hewitt

23-Jan-07 19:40

All EXEs and DLLs produced by VC++6.0 are PE files. Even dotNET assemblies are PE files.

Steve

Re: Base Address

Shouvik Das23-Jan-07 19:46

Shouvik Das

23-Jan-07 19:46

ok then here is wat you will feel is useful
1)I've set of few classes
2)I'm not allowed to change anything in "1"
3)I'll create my own class(es) and rebuild it along with the above set.

now tell me when there is no scope of creating an EXE only using '1)' how do i access the private methods residing in '1)'. To do that i thought of using the base address to offset and locate the desired method or else use the name mangles and resolve.

now in this scenario how eil PE help me out. Just let me know how does my flow of work should be and where sould PE fit in

There are only two kinds of people who are really fascinating-people who know absolutely everything, and people who know absolutely nothing.
Oscar Wilde (1854-1900)
Regards...
Shouvik

Re: Base Address

Stephen Hewitt23-Jan-07 20:06

Stephen Hewitt

23-Jan-07 20:06

This is what you're trying to do but should not even consider:

// Win32.cpp : Defines the entry point for the application.
//
 
#include "stdafx.h"
#include <windows.h>
 
class CMyClass
{
private:
	void Private();
};
 
void CMyClass::Private()
{
	MessageBox(NULL, "CMyClass::Private", NULL, MB_OK);
}
 
int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
	// Type for a pointer to a member of "CMyClass" which returns and accepts nothing.
	typedef void (CMyClass::*PMyClassMemFun)();
 
	// Set the pointer from the address in the map file.
	PMyClassMemFun pFunc;
	*reinterpret_cast<ULONG_PTR*>(&pFunc) = 0x00401020; // From map file.
 
	// Instantiate the class and call the private function.
	CMyClass inst;
	(inst.*pFunc)();
 
	return 0;
}

Again I reiterate; this is perverse but that's code to do what you we're trying to do.

NOTE: You have to compile this code and then get the address from the map file. There is no guarantee your address is the same as mine. Any code changes and the address could change.

Steve

Re: Base Address

Shouvik Das23-Jan-07 20:19

Shouvik Das

23-Jan-07 20:19

Stephen Hewitt wrote:
*reinterpret_cast<ulong_ptr*>(&pFunc) = 0x00401020; // From map file

yes i too did use the address statically. I wanted to ask you if at all I can get the address while i'm building only. Remember I said I can't go for EXEs alone with source class set.\

Thanks anyways. Your help is really solicited.

There are only two kinds of people who are really fascinating-people who know absolutely everything, and people who know absolutely nothing.
Oscar Wilde (1854-1900)
Regards...
Shouvik

Re: Base Address

Shouvik Das23-Jan-07 20:21

Shouvik Das

23-Jan-07 20:21

I mean all is adhering to my requirements only one thing that I'm using static address. Is there no method to get the address from mangled name

There are only two kinds of people who are really fascinating-people who know absolutely everything, and people who know absolutely nothing.
Oscar Wilde (1854-1900)
Regards...
Shouvik

Re: Base Address

Stephen Hewitt23-Jan-07 20:25

Stephen Hewitt

23-Jan-07 20:25

Theoretically even recompiling the EXE to update the address could change the address (although in practice this is unlikely). The best approach would be to read in the address at runtime from a file you produce after the build is complete by parsing the map file. Not that I approve of such things; private functions are private for a reason.

Steve

Re: Base Address

Shouvik Das23-Jan-07 20:31

Shouvik Das

23-Jan-07 20:31

Exactly...what i thought ou too said.
I know how VC mangles the name so I can parse and read the Address. But now in this again i've a doubt. When I compile the files(source classes) then try to build it along with my classes. So the earlier one will generate a map file

Will the address remain the same when i rebuild the application along with my class(es)

Am i too ambiguous??? Blush | :O

There are only two kinds of people who are really fascinating-people who know absolutely everything, and people who know absolutely nothing.
Oscar Wilde (1854-1900)
Regards...
Shouvik

Re: Base Address

Shouvik Das24-Jan-07 3:46

Shouvik Das

24-Jan-07 3:46

hi steve

your help has pulled me off a catastrophe. I did the tokenizing of the .map file and could retrieve the address. noe since the address is of a string type in the as 0x00401190 so now i need to convert it into a HEX format. then I can pass it as an address where earlier we were passing the constant adress.

So the dangling pointer error is removed. thanks for the immense help you have provided

There are only two kinds of people who are really fascinating-people who know absolutely everything, and people who know absolutely nothing.
Oscar Wilde (1854-1900)
Regards...
Shouvik

Re: Base Address

Shouvik Das24-Jan-07 4:39

Shouvik Das

24-Jan-07 4:39

I did a conversion for string type to unsigned long using strtoul() method. Now works fine

There are only two kinds of people who are really fascinating-people who know absolutely everything, and people who know absolutely nothing.
Oscar Wilde (1854-1900)
Regards...
Shouvik

Re: Base Address

Shouvik Das24-Jan-07 4:48

Shouvik Das

24-Jan-07 4:48

So when I could achieve it in VC now next comes in line is GCC where the name mangling starts with _Z and then few traits are there. Anyhow can you help me out in generating the map file for a GCC environment.

I mean a detailed help. I really am greatful to you for the help you extended hence looking forward for a next one;).

Thanks steve! Smile | :)

There are only two kinds of people who are really fascinating-people who know absolutely everything, and people who know absolutely nothing.
Oscar Wilde (1854-1900)
Regards...
Shouvik

how to send smtp commands

neha.agarwal2723-Jan-07 18:25

neha.agarwal27

23-Jan-07 18:25

Hi to all
i m working on smtp in MFC environment i want to know the format of sending comand for authentication
when i give command EHLO
then i got
250-cm-ms5.globat.com
250-PIPELINING
250-SIZE 655360000
250-ETRN
250-STARTTLS
250-AUTH DIGEST-MD5 CRAM-MD5 LOGIN PLAIN
250-AUTH=DIGEST-MD5 CRAM-MD5 LOGIN PLAIN
250 8BITMIME

after this i issue AUTH CRAM-MD5
i get 334 PENCeUxFREJoU0NnbmhNWitOMjNGNndAZWx3b29kLmlubm9zb2Z0LmNvbT4=

But when i send user name and passward i get again 334 with some value like above
what should i do to get 235

Thanks in Advance

Moving from wCE 4 to vs 2005

AlexEvans23-Jan-07 18:22

AlexEvans

23-Jan-07 18:22

Hello there

I am trying to move my CE based application from wCE 3/4 to vs 2005. I found out that all my database handling code needs to go into the bin, and I need to start from scartch...

My question, what should I use now - fro Windows Mobile 2003 / ARM architecture, C++ within vs 2005. It seems all my desire to use ADO is getting me to a dead end...

Hope someone can help

Thanks
Alex

Conversion

Subramaniam s.V.23-Jan-07 17:56

Subramaniam s.V.

23-Jan-07 17:56

Hi All,

Can anyone tell me as how I convert from a 2-dimensional charater array to a CStringArray.

Thanks
Subramaniam S.V.

Re: Conversion

Christian Graus23-Jan-07 18:10

Christian Graus

23-Jan-07 18:10

I would imagine that you can iterate over the outer array, and if the inner array is of strings, you can builds a CString from each and put it in your array.

I'd advocate using std::vector, I always prefer C++ to external libraries where possible. They're standard, and they are better.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Re: Conversion

Subramaniam s.V.23-Jan-07 18:14

Subramaniam s.V.

23-Jan-07 18:14

No it is giving junk value when I try to assign Char[] to a string

x-y graph

Aint23-Jan-07 17:27

Aint

23-Jan-07 17:27

Hi.

How do you plot x-y graph using visual C++ 6?

Re: x-y graph