Zipping Files In Memory With Xojo
If you are generating a lot of files in Xojo to be downloaded, it makes sense to zip your files, so that the end-user has only to download one file.
You can easily achieve this with MonkeyBread’s MBS Plugin: ArchiveWriterMBS, which you can download here.
The following code is showing how to create 3 text files in-memory. These files are then getting compressed in-memory and then automatically downloaded. This project is for Xojo Web 2.0 but will work as well for Desktop Apps with a few changes.
// Array to store the created files var files() as WebFile // >> created as properties in the IDE (e.g. file1 as webfile) file1 = new WebFile file2 = new WebFile file3 = new WebFile zippedFile = new Webfile // << created as properties in the IDE (e.g. file1 as webfile) // Populating the webfiles and adding them to an array file1.MimeType = "text/plain" file1.ForceDownload = False file1.Filename = "file1.txt" file1.Data = "Lore Lipsum 1" files.add(file1) file2.MimeType = "text/plain" file2.ForceDownload = False file2.Filename = "file2.txt" file2.Data = "Lore Lipsum 2" files.add(file2) file3.MimeType = "text/plain" file3.ForceDownload = False file3.Filename = "file3.txt" file3.Data = "Lore Lipsum 3" files.add(file3) // Defining the ZIP File zippedFile.MimeType = "application/zip" zippedFile.ForceDownload = true zippedFile.Filename = "myCompressedFiles.zip" // defining the zip file in memory Var myZip as new ArchiveWriterMBS myZip.SetFormatZip myZip.ZipSetCompressionDeflate var check as boolean = myZip.CreateMemoryFile if check then // Looping over all the files in my array of files for each file as webfile in files // creating an entry in the zip file per webfile in the array var e as new ArchiveEntryMBS e.PathName = file.Filename e.Size = lenb( file.Data ) e.Permissions = &o0644 e.FileType = e.kFileTypeRegular myzip.WriteHeader e call myZip.WriteData file.Data myZip.FinishEntry next myZip.Close end if // copy the Zip-File from the memory into the in-memory ZIP-WebFile zippedFile.data = myZip.MemoryData // download the zip File gotoUrl( zippedFile.url )
You need to create the following properties in Xojo’s IDE:
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