Platforms to show: All Mac Windows Linux Cross-Platform
Required plugins for this example: MBS Picture Plugin
You find this example project in your Plugins Download as a Xojo project file within the examples folder: /Picture/Twain/Twain Sliced
This example is the version from Wed, 23th Oct 2018.
Project "Twain Sliced.xojo_binary_project"
Class App Inherits Application
Const kEditClear = "&Löschen"
Const kFileQuit = "Beenden"
Const kFileQuitShortcut = ""
End Class
Class MainWindow Inherits Window
Control PushButton1 Inherits PushButton
ControlInstance PushButton1 Inherits PushButton
EventHandler Sub Action()
t.SelectDS
StaticText1.text=str(t.Lasterror)
dim i as TwainIdentityMBS = t.DSIdentity
if i<>Nil then
MsgBox "Selected: "+i.ProductName
end if
End EventHandler
End Control
Control PushButton2 Inherits PushButton
ControlInstance PushButton2 Inherits PushButton
EventHandler Sub Action()
dim p as Picture=t.Acquire
StaticText1.text=str(t.Lasterror)
if p<>Nil then
Canvas1.Backdrop = p
dim f as FolderItem = SpecialFolder.Desktop.Child("Acquire.jpg")
p.Save(f, p.SaveAsJPEG)
else
System.DebugLog "Acquire returned nil picture."
if t.Lasterror = 0 then
t.ProcessEvents
end if
end if
End EventHandler
End Control
Control Canvas1 Inherits Canvas
ControlInstance Canvas1 Inherits Canvas
End Control
Control CloseTimer Inherits Timer
ControlInstance CloseTimer Inherits Timer
EventHandler Sub Action()
DoClose
End EventHandler
End Control
Control TransferTimer Inherits Timer
ControlInstance TransferTimer Inherits Timer
EventHandler Sub Action()
DoTransfer
End EventHandler
End Control
Control StaticText1 Inherits Label
ControlInstance StaticText1 Inherits Label
End Control
Control PushButton3 Inherits PushButton
ControlInstance PushButton3 Inherits PushButton
EventHandler Sub Action()
dim devices() as TwainIdentityMBS = t.AllDevices
dim names() as string
for each d as TwainIdentityMBS in devices
names.Append d.ProductName+" from "+d.Manufacturer
next
MsgBox "Found devices: "+Join(names, ", ")
End EventHandler
End Control
Control PushButton4 Inherits PushButton
ControlInstance PushButton4 Inherits PushButton
EventHandler Sub Action()
dim device as TwainIdentityMBS = t.DSIdentity
if device = nil then
MsgBox "no device selected."
else
MsgBox device.ProductName
end if
End EventHandler
End Control
Control PushButton5 Inherits PushButton
ControlInstance PushButton5 Inherits PushButton
EventHandler Sub Action()
dim devices() as TwainIdentityMBS = t.AllDevices
dim c as integer = UBound(devices)+1
dim p as TwainIdentityMBS = devices(rnd * c)
t.SelectDS(p)
if t.Lasterror = 0 then
MsgBox "selected device: "+p.ProductName
else
MsgBox "Failed to select device: "+str(t.Lasterror)
end if
End EventHandler
End Control
Control PushButton6 Inherits PushButton
ControlInstance PushButton6 Inherits PushButton
EventHandler Sub Action()
dim device as TwainIdentityMBS = t.DefaultDevice
if device = nil then
MsgBox "no device selected."
else
MsgBox device.ProductName
end if
End EventHandler
End Control
Control PushButton7 Inherits PushButton
ControlInstance PushButton7 Inherits PushButton
EventHandler Sub Action()
dim devices() as TwainIdentityMBS = t.AllDevices
dim c as integer = UBound(devices)+1
dim p as TwainIdentityMBS = devices(rnd * c)
t.DefaultDevice = p
if t.Lasterror = 0 then
MsgBox "OK"
else
MsgBox "Failed to select device: "+str(t.Lasterror)
end if
End EventHandler
End Control
EventHandler Sub Close()
't.RemoveEvent
if t <> nil then
t.win = nil
end if
End EventHandler
EventHandler Sub Open()
t=new TWAIN(t.TWCY_GERMANY, t.TWLG_GERMAN)
t.Parent = self
t.win = self
End EventHandler
Sub DoClose()
t.DisableDS
t.CloseDS
StaticText1.text=str(t.Lasterror)
End Sub
Sub DoTransfer()
// you can query image info
dim img as TwainImageInfoMBS = t.ImageInfo
t.ProvideSlicePicture = true
t.ProvideSliceData = true
// now transfer
dim p as Picture=t.TransferImage
if p<>Nil then
Canvas1.Backdrop = p
dim f as FolderItem = SpecialFolder.Desktop.Child("TransferImage.jpg")
p.Save(f, p.SaveAsJPEG)
else
System.DebugLog "TransferImage returned nil picture."
end if
t.DisableDS
t.CloseDS
StaticText1.text=str(t.Lasterror)
End Sub
Property n As Integer
Property t As TWAIN
End Class
MenuBar MenuBar1
MenuItem FileMenu = "&Ablage"
MenuItem FileQuit = "#App.kFileQuit"
MenuItem EditMenu = "&Bearbeiten"
MenuItem EditUndo = "&Rückgängig"
MenuItem UntitledMenu1 = "-"
MenuItem EditCut = "&Ausschneiden"
MenuItem EditCopy = "&Kopieren"
MenuItem EditPaste = "&Einfügen"
MenuItem EditClear = "#App.kEditClear"
MenuItem UntitledMenu0 = "-"
MenuItem EditSelectAll = "&Alles auswählen"
End MenuBar
Class TWAIN Inherits TwainMBS
EventHandler Sub CloseRequest()
System.DebugLog CurrentMethodName
if win <> nil then
if win.ControlCount = 0 then
// window already closed!
win = nil
else
// start timer to do close
win.CloseTimer.Mode = timer.ModeSingle
end if
end if
End EventHandler
EventHandler Sub TransferEnded(pic as picture, ImageInfo as TwainImageInfoMBS, sliced as boolean, layout as TwainImageLayoutMBS)
System.DebugLog CurrentMethodName
End EventHandler
EventHandler Sub TransferProgress(percent as double, dataRead as Int64, DataSize as Int64, ImageInfo as TwainImageInfoMBS, NewDataSize as integer, NewData as Memoryblock, NewPicture as Picture, layout as TwainImageLayoutMBS, Columns as Integer, Rows as Integer, XOffset as Integer, YOffset as Integer)
System.DebugLog CurrentMethodName+" "+str(percent)
MainWindow.Canvas1.Backdrop = NewPicture
count = count + 1
if NewPicture <> Nil then
dim f as FolderItem = SpecialFolder.Desktop.Child("TransferImage "+str(count)+".jpg")
NewPicture.Save(f, NewPicture.SaveAsJPEG)
end if
if NewData <> Nil then
dim f as FolderItem = SpecialFolder.Desktop.Child("TransferImage "+str(count)+".dat")
dim b as BinaryStream = BinaryStream.Create(f, true)
b.Write NewData.StringValue(0, NewDataSize)
b.Close
end if
End EventHandler
EventHandler Sub TransferReady()
System.DebugLog CurrentMethodName
if win <> nil then
if win.ControlCount = 0 then
// window already closed!
win = nil
else
// start timer to do transfer
win.TransferTimer.Mode = timer.ModeSingle
end if
end if
End EventHandler
EventHandler Function TransferStarted(DataSize as Int64, ImageInfo as TwainImageInfoMBS, layout as TwainImageLayoutMBS) As boolean
System.DebugLog CurrentMethodName+" "+str(DataSize)
// you can decide here if you want to use slices only
// Return true to not get a big picture on the end
// if data for image can't be allocated you get sliced automatically.
if ImageInfo.ImageWidth > 5000 or ImageInfo.ImageLength > 5000 then
System.DebugLog "Image to large, so we use slices."
Return true
end if
if DataSize > 100000000 then // no images over 100 MB in one chunk
System.DebugLog "Image to big, so we use slices."
Return true
end if
End EventHandler
Property Win As MainWindow
Property count As Integer
End Class
End Project
See also:
The items on this page are in the following plugins: MBS Picture Plugin.
