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.
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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