// This overload method is used to get ListView group data.
internal static unsafe bool GetGroupInfo(IntPtr hwnd, ref NativeMethods.LVGROUP group)
{
ProcessorTypes localBitness;
ProcessorTypes remoteBitness;
GetProcessTypes(hwnd, out localBitness, out remoteBitness);
if (localBitness == remoteBitness)
{
int result = 0;
fixed (NativeMethods.LVGROUP* pGroup = &group)
{
result = XSendGetIndex(hwnd, NativeMethods.LVM_GETGROUPINFO,
new IntPtr(group.iGroupID), new IntPtr(pGroup), Marshal.SizeOf(group.GetType()));
}
if (result == group.iGroupID)
{
return true;
}
}
else if (remoteBitness == ProcessorTypes.Processor32Bit)
{
LVGROUP_32 group32 = new LVGROUP_32(group);
int result = XSendGetIndex(hwnd, NativeMethods.LVM_GETGROUPINFO,
new IntPtr(group.iGroupID), new IntPtr(&group32), Marshal.SizeOf(group32.GetType()));
if (result == group32.iGroupID)
{
group = (NativeMethods.LVGROUP)group32;
return true;
}
}
else if (remoteBitness == ProcessorTypes.Processor64Bit)
{
LVGROUP_64 group64 = new LVGROUP_64(group);
int result = XSendGetIndex(hwnd, NativeMethods.LVM_GETGROUPINFO,
new IntPtr(group.iGroupID), new IntPtr(&group64), Marshal.SizeOf(group64.GetType()));
if (result == group64.iGroupID)
{
group = (NativeMethods.LVGROUP)group64;
return true;
}
}
return false;
}
// This overload method is used to get ListView Group Item text.
internal static unsafe string GetItemText(IntPtr hwnd, NativeMethods.LVGROUP item)
{
ProcessorTypes localBitness;
ProcessorTypes remoteBitness;
GetProcessTypes(hwnd, out localBitness, out remoteBitness);
if (localBitness == remoteBitness)
{
// obtain group string (header only)
if (Environment.OSVersion.Version.Major == 5)
{
return ListView_V6_GetGroupTextOnWinXp(hwnd, item);
}
return GetTextWithinStructure(hwnd, NativeMethods.LVM_GETGROUPINFO, new IntPtr(item.iGroupID), new IntPtr(&item), Marshal.SizeOf(item.GetType()), new IntPtr(&item.pszHeader), item.cchHeader);
}
else if (remoteBitness == ProcessorTypes.Processor32Bit)
{
LVGROUP_32 item32 = new LVGROUP_32(item);
// obtain group string (header only)
if (Environment.OSVersion.Version.Major == 5)
{
return ListView_V6_GetGroupTextOnWinXp(hwnd, item32);
}
return GetTextWithinStructure(hwnd, NativeMethods.LVM_GETGROUPINFO, new IntPtr(item32.iGroupID), new IntPtr(&item32), Marshal.SizeOf(item32.GetType()), new IntPtr(&item32.pszHeader), item32.cchHeader);
}
else if (remoteBitness == ProcessorTypes.Processor64Bit)
{
LVGROUP_64 item64 = new LVGROUP_64(item);
// obtain group string (header only)
if (Environment.OSVersion.Version.Major == 5)
{
return ListView_V6_GetGroupTextOnWinXp(hwnd, item64);
}
return GetTextWithinStructure(hwnd, NativeMethods.LVM_GETGROUPINFO, new IntPtr(item64.iGroupID), new IntPtr(&item64), Marshal.SizeOf(item64.GetType()), new IntPtr(&item64.pszHeader), item64.cchHeader);
}
return "";
}
private static string ListView_V6_GetGroupTextOnWinXp(IntPtr hwnd, LVGROUP_32 group)
{
// Due to the ListView Group bug on WinXP we need to have a special implementation
// for retrieving a text of the group for WinXP
// On WinXP the code to give back the header text looks something like that:
// if (plvgrp->mask & LVGF_HEADER)
// {
// plvgrp->pszHeader = pgrp->pszHeader;
// }
// Instead of something along the lines of StringCchCopy(plvgrp->pszHeader, plvgrp->cchHeader, pgrp->pszHeader);
// Hence after the call to CommCtrl.Common_GetSetText() we will get back an internal buffer pointer
// and not the text itself (ref string str will be ""). It makes no sense to call CommCtrl.Common_GetSetText()
// Use XSendMessage to get the internal buffer pointer and than "manually" read the string
// get internal buffer pointer (group.pszHeader)
// NOTE: do no check XSendMessage.XSend since, LVM_GETGROUPINFO returns id of the group which can be 0, hence
// can be treated as failure
// We will check group.pszHeader to IntPtr.Zero after the call
unsafe
{
XSend(hwnd, NativeMethods.LVM_GETGROUPINFO, new IntPtr(group.iGroupID), new IntPtr(&group), group.cbSize, ErrorValue.NoCheck);
}
if (group.pszHeader != 0)
{
// Read the string manually...
// allocate memory from the unmanaged memory
using (SafeCoTaskMem copyTo = new SafeCoTaskMem(NativeMethods.MAX_PATH))
{
if (!copyTo.IsInvalid)
{
using (SafeProcessHandle hProcess = new SafeProcessHandle(hwnd))
{
if (!hProcess.IsInvalid)
{
int count;
if (Misc.ReadProcessMemory(hProcess, new IntPtr(group.pszHeader), copyTo, new IntPtr(NativeMethods.MAX_PATH), out count))
{
return copyTo.GetStringAuto();
}
}
}
}
}
}
return "";
}