C / C++ / MFC

1-May-07 0:44

hi i want to know is there a way to execute an exe file in memory without extracting it to hard disk. i have created sfx which extracts the compressed file to the disk. i can extract file to memory but i don't know how to execute that in memory.

any idea??

David Crow1-May-07 2:42

David Crow

1-May-07 2:42

near2world wrote:
i want to know is there a way to execute an exe file in memory without extracting it to hard disk.

None that I've ever been able to find. That's not to say that one does not exist, however.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Joan M1-May-07 5:00

1-May-07 5:00

I don't know if this is impossible, but several time ago you could generate a virtual hard disk in the RAM area. would'nt this be a kind of solution? (I can't remember the instruction).

And in antoher hand, would'nt it be possible to use any of the libraries that exist in order to interact with zip,rar... and try to modify them in order to achieve that?

PS: I've never done that before, only thinking on those two possibilities...

near2world1-May-07 5:29

1-May-07 5:29

actually i am writing a program that will protect an exe by attaching it to sfx. now when this sfx is launched it will ask password, if pass is correct sfx extracts the exe and executes.
now sfx can extract file to hard disk and launch it.very straight and very simple. but what if a user points out the extracted exe and copies it then the whole purpose is simply defeated.
i am struck what to do. Confused | :confused:

David Crow1-May-07 5:41

David Crow

1-May-07 5:41

near2world wrote:
but what if a user points out the extracted exe and copies it then the whole purpose is simply defeated.

True, but there are workarounds for this.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

near2world1-May-07 10:28

1-May-07 10:28

i'm eager to know.

thnx

David Crow1-May-07 10:35

David Crow

1-May-07 10:35

Just code your program to expect a command-line argument. When you run your program from inside of another, you would supply said argument. Those that save your program to try and run elsewhere would not know that it required a command-line argument nor what it should be. Make sense?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

near2world2-May-07 4:48

2-May-07 4:48

this looks like an alternative solution to the problem.
thnx a lot.

Joan M1-May-07 5:47

My thead application gets hang

1-May-07 5:47

uufff... as you know there are programs that decode the passwords for compressed files... moreover, surely there are lots of ways to get access to that exe while it is loaded...

I don't know, let's see if somebody can help you... I can't...

amitmistry_petlad 30-Apr-07 23:49

amitmistry_petlad

30-Apr-07 23:49

Hello everybody!
my thread application gets hang. can anybody help me welcome for sharing the code.

"Success lies not in the result , But in the efforts !!!!!"
Amit Mistry - petlad -Gujarat-India

sthotakura1-May-07 0:16

sthotakura

1-May-07 0:16

Can you explain more?

Cheers,
Suresh

amitmistry_petlad 1-May-07 0:25

amitmistry_petlad

1-May-07 0:25

sure dear !
actually i have been waiting for anybody's replay.thanks

well I have made list view in that list view there are suppose some files. I have started the batch mode protection . I have to use threading for that.
how can I do?

the code is below.

hwndListbox=hList; //GetDlgItem(hDlg,IDC_LIST4); //change  the list view to global
				
				LRESULT ListBoxItemCount=ListView_GetItemCount(hwndListbox);													
				int iSelectedFile1=ListView_GetSelectedCount(hwndListbox);

				int  iSelectedFile=SendMessage(hList,LVM_GETNEXTITEM,-1,LVNI_SELECTED);
					

				if(ListBoxItemCount > 0)
				{
		 		
					 for(int i=0;i<ListBoxItemCount;i++)
					 {
						ListView_GetItemText(hwndListbox,i,1,(LPWSTR)&szBuffer,MAX_PATH);
						ListView_GetItemText(hwndListbox,i,3,(LPWSTR)&szBuffer2,MAX_PATH);						
					
						
						string inputFile2= util.ConvertWCHARToString(szBuffer2);
						string filenamewithpath  = util.ConvertWCHARToString(szBuffer);
						string inputFile=inputFile2+"\\"+filenamewithpath;
						

	MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,inputFile.c_str(),(int)(inputFile.length() + 1),bufferwithpath,MAX_PATH);

									 UINT Iselected=ListView_GetSelectedCount(hList);										

						
						unsigned threadID;
						Utility util;

						string outputfile=PrepareOutputFile(hDlg,util.ConvertWCHARToString(bufferwithpath));
						WCHAR w_Output[MAX_PATH];//=util.ConvertStringToWCHAR(outputfile); 
MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,outputfile.c_str(),(int)(outputfile.length() + 1),w_Output,MAX_PATH);
						struct argument_list l;
											 
						 l.pszInFile=bufferwithpath; 
						 l.pszOutFil=w_Output;
						 l._ProtectSet=_ProtectSet;
						 l.hList=hList;
						 l.Host=HOST;
						 l.hwndEncrypt=hwndEncrypt;
						 l.hWndinoutfiledir=hWndinoutfiledir;
						 l.hwndParent=hDlg;
						 l.InitPackageRequest=sINIT_PACKAGE_RESPONSE;
						 l.Port=PORT;
						 l.ScriptFile=COMMUNICATOR_SCRIPT_FILE_PATH;
						 l.UserID=UserID;

						
						  <big>hThread=(HANDLE)_beginthreadex(NULL, 0, &Thread ,&l,NULL, 0);</big>										
					
					 }

					 	WaitForSingleObject( hThread, INFINITE );
				
















unsigned __stdcall Thread(void* pArguments )
{
	HRESULT hr;
	struct argument_list *Lparam= (argument_list *)pArguments ;
	Package pkg;
	//::WaitForSingleObject( hThread, INFINITE );
	//::waitfor
	<big>hr=pkg.EncodeMediaContent(Lparam->pszInFile,Lparam->pszOutFil,Lparam->hwndParent,Lparam->Host,Lparam->UserID,Lparam->InitPackageRequest,Lparam->ScriptFile,Lparam->Port,Lparam->hList,Lparam->_ProtectSet,Lparam->hWndinoutfiledir,Lparam->hwndEncrypt);  </big>  //The above function send request to the sever and that http response back in hr=s_ ok form.
	if(hr==S_OK)
	{
	
	MessageBox(0,L"thread gone finished" ,L"therad",0);
	_endthreadex( 0 );    	
	}
	return 0;
}

"Success lies not in the result , But in the efforts !!!!!"
Amit Mistry - petlad -Gujarat-India

Mark Salsbery1-May-07 5:55

1-May-07 5:55

Why use a separate thread if you are just going to wait for it to finish?

If it's hanging then you can break execution in the debugger and examine the call stack(s)
to see where it's hanging.

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Mark Salsbery2-May-07 5:06

2-May-07 5:06

I got your code (email) and right away I noticed your struct argument_list l; variable that
you are passing to your thread isn't static or global so it goes out of scope while the thread is
running. That's a big problem Smile | :)

Instead of making it global, maybe allocate the object with new and pass the pointer to the
thread. The thread can delete it when it's done with it or the thread can notify the calling
thread somehow and let the calling thread delete it - whatever works best for your application.

I'll let you know if I find anything else.

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Mark Salsbery2-May-07 5:34

Can this generate a memory leak?

2-May-07 5:34

I just got an email saying I have responded to myself here[^]

That message was meant for you.

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Joan M30-Apr-07 23:40

Re: Can this generate a memory leak?

30-Apr-07 23:40

Hello,

I've made a function that uses a BSTR, and returns it type casted as a CString.

Something like that:

CString Myfunc()<br />
{<br />
  BSTR a;<br />
  somefunc(&a);<br />
  return (CString)a;<br />
}

And then I use that in order to set the returned CString as the text of a CEdit:

CEdit B;<br />
B.SetwindowtextA(MyFunc());

Is there any way that this could be generating a memory leak?

As always thank you in advance.

Stephen Hewitt1-May-07 1:21

Stephen Hewitt

1-May-07 1:21

That code will leak memory.

Steve

Re: Can this generate a memory leak?

Joan M1-May-07 1:27

Re: Can this generate a memory leak?

1-May-07 1:27

OK, how should I avoid it?

Thank you for your feedback.

James R. Twine1-May-07 2:29

James R. Twine

1-May-07 2:29

It could - depending on how the BSTR is managed... BSTRs normally transfer ownership, so when somefunc(...) places a BSTR into the passed variable, it likely transferred ownership of that copy of the BSTR. You would have to free that BSTR to prevent a leak (note that this kind of leak may not be reported by the debugger). Using a CComBSTR will take care of freeing it for you, BTW. So basically, if you are handing the BSTR correctly, your code will leak, and if you are handling it incorrectly, you might not leak!

If all you are doing is putting that value into an edit control, you can take advance of the fact that a BSTR is a wide string behind the scenes and can directly call SetWindowTextW( HWND, LPCWSTR ) to copy the data in the BSTR directly to the edit control, saving the overhead of the temporary CString. May not be a big difference in your application, but efficiency a good habit to get into IMHO.

{
    CComBSTR bstrSomeValue;
    CEdit    B;
 
    // ...
 
    somefunc( &bstrSomeValue );
    ::SetWindowTextW( B.m_hWnd, bstrSomeValue );
}

Peace!

Splitbars in VC++

neha.g3030-Apr-07 23:05

neha.g30

30-Apr-07 23:05

Hi
How to create two splitbars in VC++?

Re: Splitbars in VC++

Mark Salsbery1-May-07 5:57