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| ===Using Paste/Copy commands at runtime=== | | ===Using Paste/Copy commands at runtime=== |
| Copy: | | Copy: |
| <pre class="brush:delphi"> | | <syntaxhighlight lang="delphi"> |
| if assigned(LMDShellList1.selected) then | | if assigned(LMDShellList1.selected) then |
| LMDDoContextMenuVerb( LMDShellList1, (LMDShellList1.Selected as TLMDShellListItem).ShellItem, 'copy'); | | LMDShellDoContextMenuVerb( LMDShellList1, (LMDShellList1.Selected as TLMDShellListItem).ShellItem, 'copy'); |
| </pre> | | </syntaxhighlight> |
| Paste: | | Paste: |
| <pre class="brush:delphi"> | | <syntaxhighlight lang="delphi"> |
| LMDDoContextMenuVerb( LMDShellList2, LMDShellFolder2.ActiveFolder,'paste');
| | LMDShellDoContextMenuVerb( LMDShellList2, LMDShellFolder2.ActiveFolder,'paste'); |
| </pre> | | </syntaxhighlight> |
|
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| ==LMD RichPack== | | ==LMD RichPack== |
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| ===[Linker Error] Unresolved external "InternetCloseHandle" referenced from=== | | ===[Linker Error] Unresolved external "InternetCloseHandle" referenced from=== |
| Simply add wininet.lib to your project (file can be found in \lib directory of your C++ Builder / BDS / CRS installation). In recent IDEs you can also add<br> | | Simply add wininet.lib to your project (file can be found in \lib directory of your C++ Builder / BDS / CRS installation). In recent IDEs you can also add<br> |
| <code>#pragma link "wininet.lib"</code><br> in your code. | | <syntaxhighlight lang="cpp"> |
| | | #pragma link "wininet.lib" |
| ==NG Serialization==
| | </syntaxhighlight> in your code. |
| ===How to serialize collections===
| |
| Serializing collections, including custom or standard collections (like TList) requires writing custom converters. For example, lets consider the folowing collection declaration:
| |
| | |
| <pre class="brush:delphi">
| |
| type
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| TItem = class
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| public
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| X: Integer;
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| Y: Integer;
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| end;
| |
| | |
| TItems = class(TObjectList<TItem>);
| |
| </pre>
| |
| | |
| To be able to serialize it, we need to declare a converter class, and '''associate''' this class with our collection using Converter attribute:
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| | |
| <pre class="brush:delphi">
| |
| type
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| TItemsConverter = class(TConverter)
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| public
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| function GetReadMode: TReadMode; override;
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| procedure Write(S: TSerializer; const V); override;
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| procedure Read(D: TDeserializer; var V); override;
| |
| end;
| |
| | |
| [Converter(TItemsConverter)]
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| TItems = class(TObjectList<TItem>);
| |
| </pre>
| |
| | |
| The converter can be implemented like this:
| |
| | |
| <pre class="brush:delphi">
| |
| function TItemsConverter.GetReadMode: TReadMode;
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| begin
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| Result := rmFillRead; // Indicate fill-read mode.
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| end;
| |
| | |
| procedure TItemsConverter.Read(D: TDeserializer; var V);
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| var
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| lst: TItems;
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| begin
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| lst := TItems(V); // Since we work in fill-read mode,
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| // V already contains a reference to
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| // TItems instance; we should not
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| // create it here.
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| lst.Clear;
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| | |
| D.BeginArray;
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| while D.HasNext do
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| lst.Add(D.Value<TItem>);
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| D.EndArray;
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| end;
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| | |
| procedure TItemsConverter.Write(S: TSerializer; const V);
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| var
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| lst: TItems;
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| i: Integer;
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| begin
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| S.BeginArray;
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| lst := TItems(V);
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| for i := 0 to lst.Count - 1 do
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| S.Value(lst[i]);
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| S.EndArray;
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| end;
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| </pre>
| |
| | |
| As can be seen, GetReadMode returns rmFillRead, which indicates that de-serializer should use fill-read mode. This means that no new TItems instance is created during de-serialization. This mode is especially usefull for collection like classes, because they usually owned by some other objects. For example, lets look at the following class:
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| | |
| <pre class="brush:delphi">
| |
| type
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| TOwner = class
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| private
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| FItems: TItems;
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| public
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| constructor Create;
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| destructor Destroy; override;
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| property Items: TItems read FItems;
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| end;
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| | |
| constructor TOwner.Create;
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| begin
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| inherited Create;
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| FItems := TItems.Create;
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| end;
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| | |
| destructor TOwner.Destroy;
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| begin
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| FItems.Free;
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| inherited;
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| end;
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| </pre>
| |
| | |
| As can be seen, TItems collection is oqned by TOwner class. TOwner expose Items as read-only property, and thus, there no way to replace collection as a whole. Only collection content can be changed.
| |
| | |
| But, fortunately, TOwner class can be serialized and de-serialized, because TItems collection has fill-read mode converter:
| |
| | |
| <pre class="brush:delphi">
| |
| var
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| src, dst: TOwner;
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| stream: TStream;
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| s: TBinarySerializer;
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| d: TBinaryDeserializer;
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| begin
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| stream := TMemoryStream.Create;
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| try
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| src := TOwner.Create;
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| src.Items.Add(TItem.Create);
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| src.Items.Add(TItem.Create);
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| src.Items.Add(TItem.Create);
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| s := TBinarySerializer.Create(stream);
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| s.Value(src);
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| s.Free;
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| | |
| stream.Position := 0;
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| | |
| d := TBinaryDeserializer.Create(stream);
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| dst := d.Value<TOwner>;
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| d.Free;
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| finally
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| stream.Free;
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| end;
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| end;
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| </pre>
| |
| | |
| Please use the following link for more information about fill-read mode:
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| [http://www.lmd.de/downloads/tutorials/serialization/index.html?fill-read_mode.htm Fill-Read Mode]
| |
<< Back to Overview page
LMD ShellPack
Using Paste/Copy commands at runtime
Copy:
if assigned(LMDShellList1.selected) then
LMDShellDoContextMenuVerb( LMDShellList1, (LMDShellList1.Selected as TLMDShellListItem).ShellItem, 'copy');
Paste:
LMDShellDoContextMenuVerb( LMDShellList2, LMDShellFolder2.ActiveFolder,'paste');
LMD RichPack
Which MS RichEdit DLL Version can I expect on a specific operating system?
Please check list of different RichEdit versions.
Searching for specific attributes
Q: I was trying out the LMD RTF wrapper (using BCB 6) and wanted to know what would be the best way to search for words or characters with a specific attribute.
A:
- Use FindTextEx
- Check SelAttributes
if attrs not ok then FindTextEx again.
LMD WebPack
[Linker Error] Unresolved external "InternetCloseHandle" referenced from
Simply add wininet.lib to your project (file can be found in \lib directory of your C++ Builder / BDS / CRS installation). In recent IDEs you can also add
#pragma link "wininet.lib"
in your code.