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Editorial Team
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Asked: 2026-05-18T21:27:47+00:00

I’ve been trying to get the text of items in listview another process. I

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I’ve been trying to get the text of items in listview another process. I found an awesome tutorial on CodeProject. Thanks to this article I was able to do this on x32. But when try to run on x64, it crashes the application I’m trying to access when SendMessage is called. In the articles comments people had simliar problems because of different pointer sizes. Some people suggested using a x64 compiler which I cant use. I need my program to run on both x32/x64. One guy suggested:

I have the answer. The LVITEM
structure is wrong under 64-bit
systems. Pointers are 64-bit now, so
the text pointer has to be followed by
a dummy value, to offset the length
member correctly.

I think this would be the best solution, as I could run it for x32 and x64 with one exe. I just have no idea how to do what hes talking about. I have included my code which currently works on x32. If anyone can help me out. That would be awesoem.

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

GetWindowThreadProcessId(procList, &pid);
process = OpenProcess(0x001f0fff, FALSE, pid);
_lvi = (LVITEM*)VirtualAllocEx(process, NULL, sizeof(LVITEM), 0x1000, 4);
_item = (char*)VirtualAllocEx(process, NULL, 512, 0x1000, 4);

lvi.cchTextMax = 512;
int r, c;
for (r = 0; r < rowCount; r++)
{
    for (c = 0; c < columnCount; c++)
    {
        lvi.iSubItem = c;
        lvi.pszText =_item;

        // Insert lvi into programs's memory
        WriteProcessMemory(process, _lvi, &lvi, sizeof(LVITEM), NULL);
        // Have program write text to in its memory where we told it to
        SendMessage(procList, LVM_GETITEMTEXT, (WPARAM)r, (LPARAM)_lvi);
        // Get TVITEM back from programs
        ReadProcessMemory(process, _item, item, 512, NULL);
     }
 }
 // Clean up the mess we made
 VirtualFreeEx(process, _lvi, 0, MEM_RELEASE);
 VirtualFreeEx(process, _item, 0, MEM_RELEASE);
 CloseHandle(process);
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1 Answer

  1. Editorial Team

    I don’t think you’ll be able to achieve this. In a 32 bit process your pointers will be too short. I believe that VirtualAllocEx will fail when called from a 32 bit process and with a 64 bit process handle as its first parameter. I think you would see this if you added error checking to your code.

    Your only solution will be to have 2 versions, x86 and x64. That should be no real trouble – usually it can be done with single source.

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