Копирование и вставка данных своего формата из буфера обмена

Code:

uses Clipboard;

// First you have to register your own ClipBoard format

// Zuerst registrieren wir unser eigenes ClipBoard Format

const

  MyClipboardFormatStr = 'MyData';

var

  MyClpFormat: integer;

  MyClpFormat := RegisterClipboardFormat(MyClipboardFormatStr);

{ The variable SLMClpFormat will contain a unique format handle for

your own clipboard format.

Die Variable SLMClpFormat enthalt ein einzigartiges Format Handle

fur unser ClipBoard Format.

}

procedure IncPointer(var p: Pointer; increment: Integer);

begin

  p := PChar(p) + Increment;

end;

// Say you have a data record defined as:

// Definiere zuerst etwa einen solchen Daten Record:

type

  PMyDataRec = ^TMyDataRec;

  TMyDataRec = record

    Name: string[50];

    Value: Integer;

  end;

{ Furthermore let's say the data records are stored in a Listbox

and shall be copied to a list box.

Angenommen, die Daten Records sind in einer ListBox gespeichert und

sollen in eine ListBox kopiert werden.

}

  // Copy like this:

procedure TForm1.CopyItems;

var

  i: integer;

  dh: THandle;

  ic: integer;

  p: Pointer;

  pi: pInteger;

begin

  // get number of items to be copied

// Die Anzahl zu kopierenden Items

ic := List1.SelCount;

  dh := GlobalAlloc(GMEM_FIXED or GMEM_ZEROINIT,

    (SizeOf(TMyDataRec) * ic) + SizeOf(Integer));

  { allocate memory for all items plus for a integer variable giving you the number of

   copied items }

  p   := GlobalLock(dh);    { Lock the allocated memory }

  pi  := pInteger(p);

  pi^ := ic;              { write number of items to allocated memory }

  IncPointer(p, SizeOf(Integer)); { increment the pointer behind the written data }

  // You don't have to create an instance of clipboard, this is done automatically

for i := 1 to List1.Items.Count do { check all items if they are selected }

  begin

    if List1.Items[i - 1].Selected then

    begin

      { This one is selected -> copy it o the clipboard }

      PMyDataRec(p)^ := PMyDataRec(List1.Items[i - 1].Data)^;

      { of course data must point to a TMyDataRec }

      IncPointer(p, SizeOf(TMyDataRec));

      { increment the pointer behind the written data }

    end;

  end;

  // You have now filled the allocated memory with all items that shall be copied.

// Now you can put them to the clipboard

Clipboard.Open;  { Open the clipboard will prevent overwriting of so far copied items }

  Clipboard.Clear; { Clear the clipboard first }

  Clipboard.SetAsHandle(MyClpFormat, Dh);  { Copy to clipboard }

  Clipboard.Close;  { finally close the clipboard }

  GlobalUnlock(dh);

  { and unlock the allocate memory. But don't free it, it will be used by the clipboard }

  if ic = 0 then

    GlobalFree(dh);    { You can free it if you haven't copied anything }

end;

// Check first if your items are still available before pasting them from the clipbard

if Clipboard.HasFormat(MyClpFormat) then

begin

  Form1.Paste1.Enabled := True;   { Yes, they are still available }

end;

// And this is, how you paste them after Paste1 is clicked

procedure TMDIForm.Paste1Click(Sender: TObject);

var

  dh: THandle;

  pdr: PSLMDataRec;

  i, ic: integer;

  p: Pointer;

  pi: pInteger;

  li: TListItem;

begin

  if Clipboard.HasFormat(MyClpFormat) then

  // We have already checked, but maybe another application has overwritten the

// clipboard in between....

begin

    ClipBoard.Open;       { First open the clipboard again }

    dh := Clipboard.GetAsHandle(MyClpFormat); { Catch the handle to the stored items }

    p  := GlobalLock(dh);  { and lock it }

    pi := pInteger(p);    { The first item is an integer giving the number of items }

    ic := pi^;            { so get the number of items }

    IncPointer(p, SizeOf(Integer)); { increment the pointer behind the read data }

    for i := 1 to ic do   { get all copied items one after another }

    begin

      li   := List1.Items.Add;  { first create a new listbox item }

      pdr  := New(PMyDataRec); { Then create a new pointer to a TMyDataRec }

      pdr^ := PMyDataRec(p)^; { and fill it with data from the clipboard }

      IncPointer(p, SizeOf(TSLMDataRec));

      { increment the pointer behind the written data }

      li.Data    := pdr;  { Set the data pointer of the list item to the new record }

      LI.Caption := pdr^.Name;  { Let the item display the record field "Name" }

      // You can of course add more record fields if the item has subitems:

     LI.SubItems.Add(IntToStr(Value));

    end;    { All data retrieved from clipboard }

    Clipboard.Close;  { Close it }

    GlobalUnlock(dh);

   { and unlock the pointer, but don't free it. This will be done by the clipboard itself,

    if necessary }

  end;

end;