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Ok, i realise this might not be the right place to be asking this question so if you know of a forum where it might be right please direct me there..
Anyways, my question is this:
When a program links to a dll, for example the winsock dll, and calls functions from it, when i decompile that program, with lets say WDasm32, will i just see it call to a memory location to where the function is once windows mapped the dll in memory? Or how does this work? Or when i decompile it, does WDasm32 also decompile the parts of dll? I don't think so, but i don't know for sure.. I've never come accross a jmp or call that references to a memory location that doesn't exist in the file so.. This is pretty confusing to me. Maybe someone knows where i can find more info about this topic?
Kuniva
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The portable executable format (PE) has an export table in it which has an entry for every DLL function that is called. When you call a DLL function within your code, at compile time this calls a method in this export table - it does not call the DLL directly. When the executable is loaded into memory, the required DLLs are then loaded as well (except if delayed-loading is on), and at that point Windows updates the export table so that it refers to the loaded location of the functions within the DLL. The advantage of this approach is that each DLL function is only called from one location, making it very fast to perform this update. If an export table were not used, Windows would have to scan through the entire executable looking for references to the DLL to update.
Consequently this means that you won't come across a jump to a memory location that doesn't exist (due to a DLL function call), as within the assembly code they will be jumps to the export table instead.
Dave
http://www.cloudsofheaven.org
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ah, this clarifies things a bit, thank you.
Kuniva
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can anybody tell me why i'm getting an access violation on the first "if hWnd != NULL
I'm trying to make sure resources get cleaned up when the destructor is called. trying not to use MFC because of mixed mode [CLR/Native] DLL issues
<br />
CPrefsDialog::~CPrefsDialog(void)<br />
{<br />
#ifdef _DEBUG<br />
char buffer[1024];<br />
if( hWnd != NULL )<br />
sprintf(buffer,"hWnd valid",hWnd);<br />
else<br />
sprintf(buffer,"hWnd is null");<br />
MessageBox(HWND_DESKTOP,buffer,"~CPrefsDialog",MB_OK);<br />
#endif<br />
<br />
if( hWnd != NULL ) <br />
{<br />
DestroyWindow(hWnd);<br />
hWnd = NULL;<br />
}<br />
}<br />
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ENewton wrote:
sprintf(buffer,"hWnd valid",hWnd);
You either don't need the 3rd parameter or you need to include a %d in the 2nd parameter.
"Sucks less" isn't progress - Kent Beck [^]
Awasu 1.1.1 [^]: A free RSS reader with support for Code Project.
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well... its actually failing just above the sprintf, during the test
if( hWnd != NULL )
^^^^^ its failing on the test... which is just crazy to me
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The misteak is in the sprintf.
Trust me 
"Sucks less" isn't progress - Kent Beck [^]
Awasu 1.1.1 [^]: A free RSS reader with support for Code Project.
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ok i'll try it... will edit this post with results.
EDIT: ok just tried it... still no workie. took out the 3rd parameter on the sprintf, but its still breaking at the "if( hWnd... )" line.
Can anybody figure this one out? I'm stumped. 
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Has hWnd been set to null in the constructor? This should not cause your problem though.
Otherwise it looks like you have corrupted some memory location, possibly in this class, try cutting it down to be as small as possible, if possible just have the constructor and destructor, if that works keep adding bits of code, or bench check the source code.
It is amazing what you can accomplish if you do not care who gets the credit. - Harry S Truman
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ENewton wrote:
CPrefsDialog::~CPrefsDialog(void)
Remove the void keyword from the parameter list. I don't think this is valid syntax for a destructor, which takes no arguments.
Software Zen: delete this;
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Hi,
I have developed a graphics intensive application based on a MFC CView and GDI+. In order to quickly develop a good user interface for this application, I am considering the possibility of converting the application to operate as an ActiveX control and moving the UI development over to a RAD tool. The performance of the ActiveX control would be an important issue.
I have no experience of developing ActiveX controls, can somebody point me in a good direction to start? Also does anyone have any thoughts on this idea, could it possibly be a false economy?
Thanks in advance,
Rich
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It may require some work. However, all this is implementable and straight forward: unless you are currently using an interface/callbacks from your View, that may not be or difficult to convert to Automation.
It's very important to start conversion with as minimum changes to your CView class. Therefore, i would recommend hosting your CView directly as a child of an ActiveX Control window (maybe even together with CFrameWnd).
I can't give you some published directions on that conversion, because I just don't know of them. However, I've done such several times.
If implemented properly, I don't think you will see any major performance hit due to ActiveX inproc COM calls.
As to could it possibly be a false economy: sure it could -- depends on your application, it's customer base, future of MFC/CLR.
I would say: if you have already implemented MFC portion: conversion to ActiveX is much simplier then writing from scratch either as ActiveX or WinForm.
Regards
"...Ability to type is not enough to become a Programmer. Unless you type in VB. But then again you have to type really fast..."
Me
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Hello,
I need to retrieve the list of Domains, and or Workgroups available to my computer. Right now I can retrieve a list using NetServerEnum, with SV_DOMAIN_TYPE_ENUM, however this list is wrong as it retrieve the correct number of domains/workgroups but only the primary name is shown. The other is shown with a null entry for name.
After I have the correct list I can determine if its a domain or workgroup with NetVerifyName...I think.
After that, I can list the computers with NetServerEnum using SV_TYPE ALL.
So, my question is...how can I get the correct list of domains and workgroups available?
Thanks!
Frank
"Keyboard Error - Press F1 to Continue"
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I figured it out. I was using LPSERVER_INFO_101, when I switched to LPSERVER_INFO_100 it worked and I was able to get everything sorted out.
Thanks,
Frank
"Keyboard Error - Press F1 to Continue"
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Hi !
The topic states it pretty well, but let me specify a little. I am building an application which uses a HTML template (mailbase.html) to send e-mail. Now, I currently have the CFile constructor to find & open this file from the same folder as the executable. However, I would like to reduce the number of files visible to the end user.
So, the necessity would be to include the HTML file to the project's resources, and use the CFile to open this "resource file" instead. Question is, what must I write for the first parameter of the constructor (filename) in order to have it search inside the executable instead of the directory where the executable is ?
Or, if the CFile isn't an appropriate solution, what should I do ? The idea is that the software opens the HTML file, copies it to CString, finds comment spots there and replaces them with appropriate information. So, a "standard" way to use a HTML template
I am using version 2003 of MS Visual Studio, but all tips/tricks, including those for older versions, will be helpful.
Greets,
Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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Maybe I'm totally missing the point here, but if you want to read the file, and then copy it into a CString, why not just include it as a string resource and use CString::LoadString to load it
Sonork 100.11743 Chicken Little
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
Within you lies the power for good - Use it!
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Thank you both for a swift response.
Mike's suggestion yielded a working solution. Using a string resource might have worked as well,
but pushing 3 kb of HTML code into a string resource just didn't sound nice.
If nothing else, it would look ugly in the String Table
I'll post the code snippet here in case someone wants to utilize it.
I must say though, it looks like a SERIOUS hack 
Note that you need to check the resource integer number for FindResource() manually from 'resource.h'
<code>
// Load the HTML file
char* ptrChar = (char*)LockResource(LoadResource(NULL, FindResource(NULL, "#130" ,RT_HTML)));
// Construct a CString from the resource
CString HTMLFile(ptrChar);
</code>
Greetings,
Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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Antti Keskinen wrote:
Note that you need to check the resource integer number for FindResource() manually from 'resource.h'
No, just use MAKEINTRESOURCE:
FindResource ( NULL, MAKEINTRESOURCE(IDR_YOUR_HTML), RT_HTML ); And some error-handling would be good too. 
--Mike--
Ericahist | Homepage | RightClick-Encrypt | 1ClickPicGrabber
Ericahist updated (again) Sep 6!
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Well, now it's a complete haxor
Greetings,
Antti
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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Hi
Ok i create a non modal dialog. My Problem is that this dialog is always in the foreground. When I click on my main dialog the created Dialog should be in the background.
How can I make this?
(Sorry for my bad English)
Mfg DarkMarine
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Given that the dialog window is modeless, it should nt remain topmost. Post the code that creates it.
Kuphryn
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Thank you for your help it works now 
Regards
DarkMarine
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i've written a up/download monitor and i want to include a feature that allows be to monitor routers, has anybody an idea how to do that ?
Thanks
Mario
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