...get/set the positions of desktop icons?
Author: Anthony Baratta / Alexander Kramarenko
// 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)
printed from
www.swissdelphicenter.ch
developers knowledge base