C / C++ / MFC

29-Jun-10 7:02

Hi, I tried using Stealing Program's Memory[^][^] in C++. That worked fine for the demo application provided with it, but when I tried to use it with a another application, I was just able to get the total number of Items in the Listview, without the Items details

Could you please help

Thanks

David Crow29-Jun-10 7:16

29-Jun-10 7:16

iceeeeman wrote:
Hi, I tried using Stealing Program's Memory[^][^] in C++.

But this link goes to a C# discussion.

iceeeeman wrote:
...without the Items details

Could you please help

Are you using ReadProcessMemory()? If so, are you checking it's return value (and then using GetLastError() if it fails)?

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iceeeeman29-Jun-10 7:28

29-Jun-10 7:28

Hi David, here's the link: Stealing Program's Memory[^]

Yes, using it.

I difference I noticed is that my source application has a AFX window, but I guess that's not a problem since I m able to get the Item Count !!

Luc Pattyn29-Jun-10 7:50

Luc Pattyn

29-Jun-10 7:50

of course integers work fine, they are passed as is, even across process boundaries.
However text/string operations such as GetWindowText and GetItemText need memory to read/write the text data; such memory must reside in the address space of the process where the data lives; you can only access that using those special Windows calls e.g. ReadProcessMemory.

The technique is used (in C#) in my LP#TrayIconBuster[^] article; have a look at the LP_Process class there.

Smile | :)

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iceeeeman29-Jun-10 7:57

29-Jun-10 7:57

Already using ReadProcessMemory, here's the code (source: Stealing Program's Memory[^])

#define WIN32_LEAN_AND_MEAN
#include <stdio.h>
#include <windows.h>
#include <commctrl.h>

int main(void) {
 HWND hwnd=FindWindow(NULL, "Stealing Program's Memory: ListView");
 HWND listview=FindWindowEx(hwnd, NULL, "SysListView32", NULL);

 int count=(int)SendMessage(listview, LVM_GETITEMCOUNT, 0, 0);
 int i;

 LVITEM lvi, *_lvi;
 char item[512], subitem[512];
 char *_item, *_subitem;
 unsigned long pid;
 HANDLE process;

 GetWindowThreadProcessId(listview, &pid);
 process=OpenProcess(PROCESS_VM_OPERATION|PROCESS_VM_READ|
                     PROCESS_VM_WRITE|PROCESS_QUERY_INFORMATION, FALSE, pid);

 _lvi=(LVITEM*)VirtualAllocEx(process, NULL, sizeof(LVITEM),
                              MEM_COMMIT, PAGE_READWRITE);
 _item=(char*)VirtualAllocEx(process, NULL, 512, MEM_COMMIT,
                             PAGE_READWRITE);
 _subitem=(char*)VirtualAllocEx(process, NULL, 512, MEM_COMMIT,
                                PAGE_READWRITE);

 lvi.cchTextMax=512;

 for(i=0; i<count; i++) {
  lvi.iSubItem=0;
  lvi.pszText=_item;
  WriteProcessMemory(process, _lvi, &lvi, sizeof(LVITEM), NULL);
  SendMessage(listview, LVM_GETITEMTEXT, (WPARAM)i, (LPARAM)_lvi);

  lvi.iSubItem=1;
  lvi.pszText=_subitem;
  WriteProcessMemory(process, _lvi, &lvi, sizeof(LVITEM), NULL);
  SendMessage(listview, LVM_GETITEMTEXT, (WPARAM)i, (LPARAM)_lvi);

  ReadProcessMemory(process, _item, item, 512, NULL);
  ReadProcessMemory(process, _subitem, subitem, 512, NULL);

  printf("%s - %s\n", item, subitem);
 }

 VirtualFreeEx(process, _lvi, 0, MEM_RELEASE);
 VirtualFreeEx(process, _item, 0, MEM_RELEASE);
 VirtualFreeEx(process, _subitem, 0, MEM_RELEASE);

 return 0;
}

Its working fine for the demo application, I used create a from in VB and used it, it worked there fine too, but not sure what's causing it to show null values for one the application that has AFX window !!

David Crow29-Jun-10 8:02

29-Jun-10 8:02

How do you know that WriteProcessMemory() and ReadProcessMemory() are working?

iceeeeman29-Jun-10 8:06

29-Jun-10 8:06

could you please let me know the way to chk it out?

Thanks

Luc Pattyn29-Jun-10 8:12

Luc Pattyn

29-Jun-10 8:12

read the documentation!
your code is not safe.
(almost) all Win32 functions have a way to report success/failure and/or an error code.
you should use it. ALWAYS.

Hmmm | :|

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use < PRE > tags for code snippets, it preserves indentation, and improves readability.

David Crow29-Jun-10 8:18

29-Jun-10 8:18

In the same way you'd check the return value from any other function.

iceeeeman29-Jun-10 8:09

29-Jun-10 8:09

Hi just checked it, they seem to return 1

iceeeeman29-Jun-10 20:16

29-Jun-10 20:16

both of them returned 1, I just noticed LVS_OWNERDRAWFIXED for my source application's list-view, any ideas on the modifications required in the code to get the list of Items

David Crow30-Jun-10 3:08

30-Jun-10 3:08

If you think that style is causing a problem, create another control without it and see what happens.

iceeeeman30-Jun-10 3:49

How i can Save Cimage file+ shapes & text on it?

30-Jun-10 3:49

Yes, tried that, it works fine for other listview's, here's some more info on it: http://www.vbforums.com/showthread.php?t=616756[^]

humais29-Jun-10 5:51

Re: How i can Save Cimage file+ shapes & text on it?

29-Jun-10 5:51

i load an Cimage file in my SDI MFC (non View/Doc arch.) application & draw some shapes & text on it... tell me how i can save both shapes,texts & CImage in any (jpg,bmp) file format... Confused | :confused:

Alan Balkany29-Jun-10 8:13

Re: How i can Save Cimage file+ shapes & text on it?

29-Jun-10 8:13

I got the answer to this problem while trying to solve my problem:

CImage image;			

// Draw on image...
		
HRESULT hr = image.Save(_T("C:\\test.jpg"), Gdiplus::ImageFormatJPEG);

humais29-Jun-10 8:30

Re: How i can Save Cimage file+ shapes & text on it?

29-Jun-10 8:30

i'm drawing shapes on it(like circle,rectangle etc) using OnPaint(); .... will it work now?? Confused | :confused:

Alan Balkany29-Jun-10 8:38

Re: How i can Save Cimage file+ shapes & text on it?

29-Jun-10 8:38

No; when you use the CDC in OnPaint, your drawing is going to the screen.

To draw on a bitmap you need to select the bitmap into a device context, then draw on that device context. Like:

CDC *mdc = GetDC ();

HGDIOBJ tmp = mdc->SelectObject(hbm);     // hbm is a handle of a bitmap.

// Draw on mdc, e.g. mdc->TextOutW (50, 50, L"Testing...");

image.Attach (hbm);
HRESULT hr = image.Save(_T("C:\\test.tif"), Gdiplus::ImageFormatTIFF);

humais29-Jun-10 8:47

Re: How i can Save Cimage file+ shapes & text on it?

29-Jun-10 8:47

i'm not using cdc....i'm using CPaintDC dc...so now wht i have to do??

Alan Balkany29-Jun-10 9:45

Re: How i can Save Cimage file+ shapes & text on it?

29-Jun-10 9:45

CPaintDC is derived from CDC, so you can perform all the same operations on it. It's an object rather than a pointer, so you have to use "." to invoke methods instead of "->".

You can select a bitmap into the CPaintDC:

dc.SelectObject (hbm);

Where hbm is the handle of a bitmap. You can also select a pointer to a CBitmap. (I don't see an overload for CImage).

You then use the drawing methods of CDC. Then (as in my example) you can attach your bitmap to a CImage object, and save it.

There may be a better way of doing this, but this should work.

humais30-Jun-10 4:52

Re: How i can Save Cimage file+ shapes & text on it?

30-Jun-10 4:52

what is hbm? plz write full code in detail... Confused | :confused:

Alan Balkany1-Jul-10 5:59

Re: How i can Save Cimage file+ shapes & text on it?

1-Jul-10 5:59

hbm is a handle to a bitmap. The Windows type is HBITMAP.

humais1-Jul-10 19:38