The first function of the following code previews all the files that match the "C:\DATA\*.dat" wildcard and that are bigger than 65536 bytes. Keep in mind that any subdirectories in C:\DATA will also be searched for *.dat files, because the ProcessSubfolders property is set to True by default, even if the code below doesn't explicitly set it. The second function below is a handler written for the PreviewingFile event that displays each file previewed, along with some other of the file's information, in a listbox. The third function below is a handler written for the ProcessCompleted event, that adds summary information into the same listbox. The code assumes you have placed a button, a listbox and an Xceed Zip control on a form, and named them Button1, ListBox1 and XceedZip1 respectively.
We start with the handler for the button's click event. The code will start the previewing.
| Delphi |
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procedure Tform1.Button1Click(Sender: Tobject);
var ResultCode : integer;
begin
XceedZip1.License( 'your license key' );
XceedZip1.FilesToProcess := 'c:\data\*.dat';
XceedZip1.MinSizeToProcess := 65536
{ Added this as an example of what you can do with the PreviewFiles method }
{ We don't need to set the ZipFilename property, because PreviewFiles doesn't look at what's in the Zip file already. }
{ Now call the PreviewFiles method without the optional parameter }
ResultCode = XceedZip1.PreviewFiles
{ If we wanted to know the total compressed size of all the previewed files, we could have used this line instead: }
{ ResultCode = XceedZip1.PreviewFiles(True); }
{ If you do this, the ProcessCompleted event's lBytesOutput parameter will contain the total compressed size. }
{ Now we check the return value }
If ResultCode <> xerSuccess Then
ShowMessage('Unsuccessful. Error #'+IntToStr(ResultCode))
Else
ShowMessage('Operation successful.');
end;
end; |
Here's the handler for the PreviewingFile event. It will add each previewed file's name and info to the listbox.
| Delphi |
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procedure TFOrm1.XceedZip1PreviewingFile(Sender: Tobject; const sFilename, sSourceFilename: WideString; lSize: Integer; xAttributes: ToleEnum; dtLastModified, dtLastAccessed, dtCreated: TdateTime; bExcluded: WordBool; xReason: ToleEnum);
begin
ListBox1.Items.Add('Filename : ' + sFilename);
ListBox1.Items.Add('Date : ' + dtCreated);
ListBox1.Items.Add('Size : ' + lSize);
end; |
Here's the handler for the ProcessCompleted event. It adds summary information to the listbox.
| Delphi |
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procedure TFOrm1.XceedZip1ProcessCompleted(Sender: Tobject; lFilesTotal, lFilesProcessed, lFilesSkipped, lBytesTotal, lBytesProcessed, lBytesSkipped, lBytesOutput: Integer; nCompressionRatio: SmallInt; xResult: ToleEnum);
begin
ListBox1.Items.Add('====================================="
ListBox1.Items.Add('Summary : ');
ListBox1.Items.Add('');
ListBox1.Items.Add('Total number of Files :' + lFilesTotal);
ListBox1.Items.Add('Total compressed Size : ' + lBytesOutput); { This information is only valid if you called the PreviewFiles method with the optional parameter set to True }
end; |