News123 wrote:
> Hi,
>
> I'm trying to scan a document from a python 2.6 script without user
> interaction.
>
> I found a code snippet, that allows me to scan under Vista, but that
> doesn't allow me to select the dpi / color mode / etc.
I'm still stuck.
I'll try to look at any solution (visual C++, C#, Basic) first.
Then it's perhaps easier to pythonize it via python .net.
However I don't know whether python .net exists for 2.6 and whether it
is stable enough.
N
>
> The snippet uses win32com.client
>
> # ##################### script start
> import win32com.client,os
>
> WIA_IMG_FORMAT_PNG = "{B96B3CAF-0728-11D3-9D7B-0000F81EF32E}"
> WIA_COMMAND_TAKE_PICTURE = "{AF933CAC-ACAD-11D2-A093-00C04F72DC3C}"
>
> os.chdir('c:/temp')
> wia = win32com.client.Dispatch("WIA.CommonDialog")
> dev = wia.ShowSelectDevice()
> for command in dev.Commands:
> if command.CommandID==WIA_COMMAND_TAKE_PICTURE:
> foo=dev.ExecuteCommand(WIA_COMMAND_TAKE_PICTURE)
> i=1
> for item in dev.Items:
> if i==dev.Items.Count:
> image=item.Transfer(WIA_IMG_FORMAT_PNG)
> break
> i=i+1
>
> image.SaveFile("test.png")
> ######################### script end
>
>
> My problems are:
>
> - This script works fine for me under Windows 7, however I'm
> unable to specify additional parameters, like dpi and
> color mode.
>
> - The script doesn't work under windows XP, though the scanner driver is
> installed. (Gimp finds the scanner (as WIA scanner)).
> Perhaps 'WIA.CommonDialig' has another name or I need to install some DLL.
> The error message is:
> --------------------------------------------------------------------
> Traceback (most recent call last):
> File "C:\work\python\minidemos\wia_get_simple.py", line 7, in <module>
> wia = win32com.client.Dispatch("WIA.CommonDialog")
> File "C:\Python26\lib\site-packages\win32com\client\__init__.py", line
> 95, in Dispatch
> dispatch, userName =
> dynamic._GetGoodDispatchAndUserName(dispatch,userName,clsctx)
> File "C:\Python26\lib\site-packages\win32com\client\dynamic.py", line
> 104, in _GetGoodDispatchAndUserName
> return (_GetGoodDispatch(IDispatch, clsctx), userName)
> File "C:\Python26\lib\site-packages\win32com\client\dynamic.py", line
> 84, in _GetGoodDispatch
> IDispatch = pythoncom.CoCreateInstance(IDispatch, None, clsctx,
> pythoncom.IID_IDispatch)
> com_error: (-2147221005, 'Invalid class string', None, None)
> ---------------------------------------------------------------------
>
>
> As I have no knowledge of Win32com and WIA I would appreciate some help
> or good documentation about wincom32 / WIA with python
>
>
>
> thanks for your help and bye
>
>
> N
>
>
>
>
>
>
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