Как получить и изменить координаты иконок на столе?

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Как получить и изменить координаты иконок на столе?[править | править код]

// For Win9x:
//-------------------------------------------

uses
  CommCtrl,
  IPCThrd; { from your Delphi\Demos\Ipcdemos directory }

function GetDesktopListViewHandle: THandle;
var
  S: String;
begin
  Result := FindWindow('ProgMan', nil);
  Result := GetWindow(Result, GW_CHILD);
  Result := GetWindow(Result, GW_CHILD);
  SetLength(S, 40);
  GetClassName(Result, PChar(S), 39);
  if PChar(S) <> 'SysListView32' then Result := 0;
end;

procedure TForm1.Button1Click(Sender: TObject);
type
  PInfo = ^TInfo;
  TInfo = packed record
    infoPoint: TPoint;
    infoText: array[0..255] of Char;
    infoItem: TLVItem;
    infoFindInfo: TLVFindInfo;
  end;
var
  r: TRect;
  hWnd: THandle;
  i, iCount: Integer;

  Info: PInfo;
  SharedMem: TSharedMem;
begin
  hWnd := GetDesktopWindow();
  GetWindowRect(hWnd,r);
  Memo.Lines.Add('Bottom: ' +  IntToStr(r.Bottom));
  Memo.Lines.Add('Right: ' + IntToStr(r.Right));

  hWnd := GetDesktopListViewHandle;
  iCount := ListView_GetItemCount(hWnd);
  Memo.Lines.Add('# Icons: ' + IntToStr(iCount));

  SharedMem := TSharedMem.Create('', SizeOf(TInfo));
  Info := SharedMem.Buffer;

  with Info^ do
  try
    infoItem.pszText := infoText;
    infoItem.cchTextMax := 255;
    infoItem.mask := LVIF_TEXT;
    try
      begin
        for i := 0 to iCount - 1 do
        begin
          infoItem.iItem := i;
          try
            ListView_GetItem(hWnd, infoItem);
            ListView_GetItemPosition(hWnd, I, infoPoint);
            Memo.Lines.Add('Icon: ' + infoText);
            Memo.Lines.Add('   X: ' + IntToStr(infoPoint.X));
            Memo.Lines.Add('   Y: ' + IntToStr(infoPoint.Y));
          except
          end;
        end;
      end;
    finally
    end;
  finally
    SharedMem.Free;
  end;
end;


// For NT, Win2k, XP:
//-------------------------------------------
// Unit to save/restore the positions of desktop icons to/from the registry)

unit dipsdef;

interface

uses
  Windows, CommCtrl;

const
  RegSubKeyName = 'Software\LVT\Desktop Item Position Saver';

procedure RestoreDesktopItemPositions;
procedure SaveDesktopItemPositions;

implementation

uses
  uvirtalloc, registry;

procedure SaveListItemPosition(LVH: THandle; RemoteAddr: Pointer);
var
  lvi: TLVITEM;
  lenlvi: integer;
  nb: integer;
  buffer: array [0..MAX_PATH] of char;
  Base: Pointer;
  Base2: PByte;
  i, ItemsCount: integer;
  Apoint: TPoint;
  key: HKEY;
  Dummy: integer;
begin
  ItemsCount := SendMessage(LVH, LVM_GETITEMCOUNT, 0, 0);
  Base := RemoteAddr;
  lenlvi := SizeOf(lvi);
  FillChar(lvi, lenlvi, 0);
  lvi.cchTextMax := 255;
  lvi.pszText := Base;
  Inc(lvi.pszText, lenlvi);

  WriteToRemoteBuffer(@lvi, Base, 255);

  Base2 := Base;
  Inc(Base2, Lenlvi);

  RegDeleteKey(HKEY_CURRENT_USER, RegSubKeyName);

  RegCreateKeyEx(HKEY_CURRENT_USER,
    PChar(RegSUbKeyName),
    0,
    nil,
    REG_OPTION_NON_VOLATILE,
    KEY_SET_VALUE,
    nil,
    key,
    nil);

  for i := 0 to ItemsCount - 1 do
  begin
    nb := SendMessage(LVH, LVM_GETITEMTEXT, i, LParam(Base));

    ReadRemoteBuffer(Base2, @buffer, nb + 1);
    FillChar(Apoint, SizeOf(Apoint), 0);

    WriteToRemoteBuffer(@APoint, Base2, SizeOf(Apoint));
    SendMessage(LVH, LVM_GETITEMPOSITION, i, LParam(Base) + lenlvi);

    ReadRemoteBuffer(Base2, @Apoint, SizeOf(Apoint));
    RegSetValueEx(key, @buffer, 0, REG_BINARY, @Apoint, SizeOf(APoint));
  end;
  RegCloseKey(key);
end;


procedure RestoreListItemPosition(LVH: THandle; RemoteAddr: Pointer);
type
  TInfo = packed record
    lvfi: TLVFindInfo;
    Name: array [0..MAX_PATH] of char;
  end;
var
  SaveStyle: Dword;
  Base: Pointer;
  Apoint: TPoint;
  key: HKey;
  idx: DWord;
  info: TInfo;
  atype: Dword;
  cbname, cbData: Dword;
  itemidx: DWord;
begin
  SaveStyle := GetWindowLong(LVH, GWL_STYLE);
  if (SaveStyle and LVS_AUTOARRANGE) = LVS_AUTOARRANGE then
    SetWindowLong(LVH, GWL_STYLE, SaveStyle xor LVS_AUTOARRANGE);

  RegOpenKeyEx(HKEY_CURRENT_USER, RegSubKeyName, 0, KEY_QUERY_VALUE, key);

  FillChar(info, SizeOf(info), 0);
  Base := RemoteAddr;

  idx := 0;
  cbname := MAX_PATH;
  cbdata := SizeOf(APoint);

  while (RegEnumValue(key, idx, info.Name, cbname, nil, @atype, @Apoint, @cbData) <>
      ERROR_NO_MORE_ITEMS) do
  begin
    if (atype = REG_BINARY) and (cbData = SizeOf(Apoint)) then
    begin
      info.lvfi.flags := LVFI_STRING;
      info.lvfi.psz := Base;
      Inc(info.lvfi.psz, SizeOf(info.lvfi));
      WriteToRemoteBuffer(@info, Base, SizeOf(info.lvfi) + cbname + 1);
      itemidx := SendMessage(LVH, LVM_FINDITEM, -1, LParam(Base));
      if itemidx > -1 then
        SendMessage(LVH, LVM_SETITEMPOSITION, itemidx, MakeLong(Apoint.x, Apoint.y));
    end;
    Inc(idx);
    cbname := MAX_PATH;
    cbdata := SizeOf(APoint);
  end;
  RegCloseKey(key);

  SetWindowLong(LVH, GWL_STYLE, SaveStyle);
end;

function GetSysListView32: THandle;
begin
  Result := FindWindow('Progman', nil);
  Result := FindWindowEx(Result, 0, nil, nil);
  Result := FindWindowEx(Result, 0, nil, nil);
end;

procedure SaveDesktopItemPositions;
var
  pid: integer;
  rembuffer: PByte;
  hTarget: THandle;
begin
  hTarget := GetSysListView32;
  GetWindowThreadProcessId(hTarget, @pid);
  if (hTarget = 0) or (pid = 0) then
    Exit;
  rembuffer := CreateRemoteBuffer(pid, $FFF);
  if Assigned(rembuffer) then
  begin
    SaveListItemPosition(hTarget, rembuffer);
    DestroyRemoteBuffer;
  end;
end;

procedure RestoreDesktopItemPositions;
var
  hTarget: THandle;
  pid: DWord;
  rembuffer: PByte;
begin
  hTarget := GetSysListView32;
  GetWindowThreadProcessId(hTarget, @pid);
  if (hTarget = 0) or (pid = 0) then
    Exit;
  rembuffer := CreateRemoteBuffer(pid, $FFF);
  if Assigned(rembuffer) then
  begin
    RestoreListItemPosition(hTarget, rembuffer);
    DestroyRemoteBuffer;
  end;
end;

end.


unit uvirtalloc;

interface

uses
  Windows, SysUtils;

function CreateRemoteBuffer(Pid: DWord; Size: Dword): PByte;
procedure WriteToRemoteBuffer(Source: PByte; Dest: PByte; Count: Dword);

function ReadRemoteBuffer(Source: PByte; Dest: PByte; Count: Dword): Dword;

procedure DestroyRemoteBuffer;

implementation

var
  hProcess: THandle;
  RemoteBufferAddr: PByte;
  BuffSize: DWord;

function CreateRemoteBuffer;
begin
  RemoteBufferAddr := nil;
  hProcess := OpenProcess(PROCESS_ALL_ACCESS, False, Pid);
  if (hProcess = 0) then
    RaiseLastWin32Error;

  Result := VirtualAllocEx(hProcess, nil, Size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  Win32Check(Result <> nil);
  RemoteBufferAddr := Result;
  BuffSize := Size;
end;

procedure WriteToRemoteBuffer;
var
  BytesWritten: Dword;
begin
  if hProcess = 0 then
    Exit;
  Win32Check(WriteProcessMemory(hProcess, Dest, Source, Count, BytesWritten));
end;

function ReadRemoteBuffer;
begin
  Result := 0;
  if hProcess = 0 then
    Exit;

  Win32Check(ReadProcessMemory(hProcess, Source, Dest, Count, Result));
end;

procedure DestroyRemoteBuffer;
begin
  if (hProcess > 0) then
  begin
    if Assigned(RemoteBufferAddr) then
      Win32Check(boolean(VirtualFreeEx(hProcess, RemoteBufferAddr, 0, MEM_RELEASE)));
    CloseHandle(hProcess);
  end;
end;

end.


Other Source for NT, Win2k, XP only:
http://www.luckie-online.de/programme/luckiedipssfx.exe
(Complete demo to save/restore the positions of desktop icons, nonVCL)


Source: Взято с сайта http://www.swissdelphicenter.ch/en/tipsindex.php
ID: 01832