function TForm1.GetTreeViewText(mHandle: THandle; Str: String): String;
function TreeNodeGetNext(mHandle: THandle; mTreeItem: HTreeItem): HTreeItem;
var
  vParentID: HTreeItem;
begin
  Result := nil;
  if (mHandle <> 0) and (mTreeItem <> nil) then
  begin
    Result := TreeView_GetChild(mHandle, mTreeItem);
    if Result = nil then
      Result := TreeView_GetNextSibling(mHandle, mTreeItem);
    vParentID := mTreeItem;
    while (Result = nil) and (vParentID <> nil) do
    begin
      vParentID := TreeView_GetParent(mHandle, vParentID);
      Result := TreeView_GetNextSibling(mHandle, vParentID);
    end;
  end;
end;

var
  vItemCount: Integer;
  vBuffer: array[0..255] of Char;
  vProcessId: DWORD;
  vProcess: THandle;
  vPointer: Pointer;
  vNumberOfBytesRead: Cardinal;
  i: Integer;
  vItem: TTVItem;
  vTreeItem: HTreeItem;
  tmp, tmp1: string;
begin
  Result := '';
  tmp:=UpperCase(Trim(Str));
  if tmp='' then Exit;
  GetWindowThreadProcessId(mHandle, @vProcessId);
  vProcess:=  OpenProcess(PROCESS_ALL_ACCESS,False,vProcessId);
  vPointer := VirtualAllocEx(vProcess, nil, 4096, MEM_RESERVE or MEM_COMMIT,
              PAGE_READWRITE);
  try
    vItemCount := TreeView_GetCount(mHandle);
    vTreeItem := TreeView_GetRoot(mHandle);
    for i := 0 to vItemCount - 1 do
    begin
      with vItem do
      begin
        mask := TVIF_TEXT;
        cchTextMax := SizeOf(vBuffer);
        pszText := Pointer(Cardinal(vPointer) + SizeOf(vItem));
        hItem := vTreeItem;
      end;
      WriteProcessMemory(vProcess, vPointer, @vItem, SizeOf(vItem), vNumberOfBytesRead);
      SendMessage(mHandle, TVM_GETITEM, 0, lparam(vPointer));
      ReadProcessMemory(vProcess, Pointer(Cardinal(vPointer) + SizeOf(TLVItem)),
                        @vBuffer[0], SizeOf(vBuffer), vNumberOfBytesRead);
      tmp1 := UpperCase(string(vBuffer));
      if AnsiPos(tmp,tmp1)>0 then
      begin
        Result := tmp1;
        Break;
      end;
      vTreeItem := TreeNodeGetNext(mHandle, vTreeItem);
    end;
  finally
    VirtualFreeEx(vProcess, vPointer, 0, MEM_RELEASE);
    CloseHandle(vProcess);
  end;
end;