Getting & Setting SysListView32 control items

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C#

API

Hello,

below is my working C# code for getting item text from syslistview32 control of another application.

IntPtr SysListView32 = Value[1];
            int count = SendMessage(SysListView32, LVM_GETITEMCOUNT,0,"0");
           
            LVITEM lvi = new LVITEM();
            lvi.mask = LVIF_TEXT; 
            lvi.cchTextMax = 512; 
            lvi.iItem = 1;            // the zero-based index of the ListView item 
            lvi.iSubItem = 0;
            lvi.pszText = Marshal.AllocHGlobal(512);
            IntPtr ptrLvi = Marshal.AllocHGlobal(Marshal.SizeOf(lvi)); 
            Marshal.StructureToPtr(lvi, ptrLvi, false);
            SendMessage(SysListView32, LVM_GETITEM, IntPtr.Zero, ptrLvi);  // Extract the text of the specified item 
            string itemText = Marshal.PtrToStringAuto(lvi.pszText); 

[StructLayoutAttribute(LayoutKind.Sequential)]
private struct LVITEM {
    public uint mask; 
    public int iItem; 
    public int iSubItem; 
    public uint state; 
    public uint stateMask; 
    public IntPtr pszText; 
    public int cchTextMax; 
    public int iImage; 
    public IntPtr lParam; 
} 

I have correct handle for SysListview32 control cause I am getting correct items count as "4" & Target SysListView32 application is shown as below

http://www.freeimagehosting.net/t/f07ab.jpg

But target aplication having this syslistview32 control always hanged when I tried to sendmessage for getting item with

lvi.iItem = 1; 
lvi.iSubItem = 0;
SendMessage(SysListView32, LVM_GETITEM, IntPtr.Zero, ptrLvi);  

I think it has to with something memmory allocation problem.
can anybody please tell me where did I make mistake in above code?

Note : Both visual studio & Target SysteListView32 control application running as administrator in my Win 7 pc.